EP0327849A2 - Electric cooking plate - Google Patents

Abstract

An electric hotplate (1) has connecting wires (17) protruding from the underside, the ends of which form connecting pins (19) and are provided with plug-in pieces (29) in the form of flat tabs which are connected solely by plug connections with mating plugs (100) of device lines (34). can be connected. An insulating body (32) is attached to the plug-in pieces (29) and, like the plug-in pieces (29), forms a preassembled structural unit and can be transferred from a stacked position into a connection position. The respective mating connector can be formed by a plug-in sleeve with stops acting in and against the plug-in direction, one of which is designed to be self-snapping.

Description

The invention relates to an electric hotplate which has electrical connections to achieve simple assembly.
The electric hotplate advantageously has a hotplate body which has the connection means for connection to device lines. These connection means should in particular have connection sections which lead away from the underside of the hotplate body and belong to heating resistor connecting wires which are essentially fixed in their position relative to the hotplate body. The connection sections are advantageously formed by wire section-shaped connection pins, which are inherently stiff under the usually occurring forces, but are also resiliently movable within small limits.

Electric hot plates are usually fastened in a hob such that they engage in a mounting opening of this hob, are supported against the edge of this mounting opening against support forces and on the underside of the hob to the devices belonging to it lines are connected. This connection offers a very high level of reliability and security if it is at least partially designed as a welded connection or as a plug-in connection in such a way that a connection piece with an insulating body is assigned to the device lines, which is only connected to the electric hotplate or the electric hotplate when the electric hotplate is installed in the hob. is connected to the connection sections, however, such a connection cannot satisfy all the assembly methods available. In particular, if no weld connection can or should not be made or if the electric hotplate with the insulating piece already arranged on it is inserted into the hob or a device cable design is to be used in which the connecting elements of the device lines have no insulating piece, such designs are not always suitable.

The invention is also based on the object to provide an electric hotplate of the type mentioned, which ensures very simple assembly and an uncomplicated electrical connection, especially when the device lines are provided at their ends with the simplest connecting elements.

This object is achieved with an electric hotplate of the type mentioned in accordance with the invention in that the respective or each connecting pin has an especially separate plug-in piece which is advantageously enlarged several times in cross-section in one or two directions relative to the wire cross-sections of the connecting pin and one pre-assembled unit forms with the hotplate body. As a result, the device lines, which have, for example, mating connectors or only wire end sleeves at their ends as connecting members, and none at all need pre-assembled insulator connected only by a plug-in process in connection with the plug-in pieces, which ensure a very secure electrical connection due to their size and pre-assembled arrangement.

The plug itself could indeed be electrically conductively or mechanically rigidly connected by squeezing, a suitable one-part reshaping of the connecting pin, a further plug connection or the like. However, a connection by spot welding is generally preferable, since this is used in the manufacture of the electric hotplate itself, i.e. before it is installed in the hob, can be carried out very easily.

Furthermore, it is conceivable to design the plug as a negative plug with a plug opening, as an essentially axially symmetrical or at least approximately round or cylindrical plug pin or the like, but there is a very simple configuration if the plug is designed as a flat tongue, the thickness of which only needs to be in the order of magnitude of the diameter of the connection sections and which is suitable as a commercially available standardized part for connection to mating plugs which can be attached to the device lines very easily, for example by squeezing. To achieve space-saving accommodation of the adjacent plug-in pieces of an electric hotplate, the largest cross-sectional extent of these plug-in pieces is expediently approximately at right angles to the level of the cooking surface of the hotplate body, all the plug-in pieces expediently projecting the same distance and being arranged symmetrically to a common central plane parallel to the cooking surface.

A particularly advantageous development of the subject matter of the invention is that at least one insulating body is provided for at least one plug-in piece, in particular for all plug-in pieces together, which can preferably be fitted from the free end of the plug-in piece or the plug-in pieces and therefore after the plug-in pieces have been attached to the Connection sections can be mounted so that it does not interfere with this attachment in any way. This insulating body, which could only be put on during the assembly of the electric hotplate in the hob, expediently forms a preassembled part of the hotplate body, i.e. that the insulating body is already at least partially placed on the respective plug-in piece or the connecting sections before the hob is installed in the hob and is secured in this position in a suitable manner against automatic or accidental loosening.

In particular, if the plug-in pieces or the insulating body, in view of the cooking surface of the hotplate body, protrude at least partially over the outer circumference of a radially outer, downwardly projecting annular flange edge of the hotplate body or even over the outer circumference of the entire hotplate body itself, difficulties can arise in the tight stacking of a large number such hot plates occur in a transport stack. A hotplate stacking device which is advantageous for this purpose, for example, can be found in German patent application P 37 28 541 .6, to which reference is made for further details. According to the invention it is provided in the present case for such a stacking device that the or the connection sections or the or the plug-in pieces or the or the insulating body by resilient or bending deformation of the connection wire or wires, by displaceable or pivotable bearings of at least one of these parts or by Similar measures can be transferred from a stacked position into an assembly or connection position, in which they lie deeper below the underside of the hotplate body and / or have a changed radial distance from the circumference of the hotplate body or from its central central axis. In the stacked position, the corresponding of these parts are expediently between the levels of the upper side, i.e. the cooking surface, and the underside, that is to say approximately the level of the lower annular end face of the outer flange edge, so that the electric hotplate in the stacked state has no parts that go beyond these levels protrude outside and there is thus a minimum possible stack height. Possibly articulated, limited bending zones for the transfer between the stack layer and the connection layer can be formed by weakened cross-sectional areas, by angled zones or the like . This definition is usually formed by an insulating piece fixed in the underside of the hotplate body, for example by fastening to a lower end cover, which passes through the connecting wires and on the underside of which they are angled against the outer circumference of the hotplate body.

Especially for the fully assembled, that is to say the final, intended position of the insulating body, it is advantageous if this mounting position is secured by at least one securing element, which securing can take place with respect to the hotplate body, with respect to the connecting pin and / or preferably with respect to the plug-in piece. Is that backup formed as a self-engaging snap member or the like., The security intervention takes place automatically when the insulating body is transferred to its mounting position.

For a secure engagement of the insulating body in the hotplate body, the insulating body in its final assembly position expediently rests on the end face or on the outer circumference or on both of these surfaces of the outer flange edge of the hotplate body, with a small clearance from these surfaces is also conceivable. By this system on the one hand and the securing member on the other hand, the insulating body is blocked in both possible directions of movement approximately parallel to the connecting pins, so that it practically forms a substantially rigid support of the plug pieces with respect to the hotplate body, which is only brought into engagement when the electric hotplate is assembled are needed and before that the mobility of the plug-in pieces, in particular transversely to the plane of the cooking surface, is in no way impeded. After the insulating body has been pushed into its end position, however, an alignment aid is created, by means of which the plug pieces are securely aligned in a precisely defined position and can therefore also be connected using automatic handling machines (robots); Such fully automated production is also possible with the remaining assembly of the electric hotplate according to the invention.

The connecting section of the hotplate expediently extends at most to the outer circumference of the hotplate body or at most to the inner circumference of the outer flange edge, preferably training according to DE-OS 35 40 816 are provided, to which reference is made for further details. As a result, an electric hotplate designed in this known manner can optionally be described there NEN connection options or for the connection options described here can only be used in that plug-in pieces or insulating bodies are also attached. In this case, since the connecting pins are relatively short, it is expedient to provide a wire or flat rod-shaped connecting section between the plug-in piece located outside the outer circumference of the outer flange edge or the hotplate body, the flat extension of which is expediently parallel to the cooking surface of the hotplate body, so that it forms a relatively easily bendable joint section transversely to the cooking surface. This connecting section can easily be formed in one piece with the plug-in piece, for example as a stamped and bent part.

But it is also conceivable that the respective pin protrudes relatively far over the outer circumference of the outer flange edge or the hotplate body or is designed in accordance with DE-OS 35 40 815, to which reference is made here for further details. In this case, the connecting pin can overlap the plug piece over part of its length or to such an extent that it extends approximately to the actual plug section of the plug piece which is to be brought into engagement for producing the plug connection.

In any case, it is expedient if the plug-in piece has a particularly flat fastening section, to which the connecting pin is tangent. The weld can be provided on a flat or side surface of the plug, so that the plug protrudes laterally only about its thickness beyond the terminal pin. In order to ensure a precisely defined and therefore particularly reliable weld connection, the plug-in has the recording of the weld spot on a stamped cam or a similar, knob-shaped or bead-shaped elevation. The end of the connecting section or the connecting pin can be flattened by squeezing or the like, so that it has a smaller cross-sectional extent in one direction and a larger cross-sectional extent at right angles to it than the rest of the connecting wire, thus ensuring a particularly secure connection with the plug-in piece.

Instead of the training described or in addition to this, it is also advantageously possible to provide at least one clamping screw on the plug-in piece, which advantageously projects into a plug-in hole of the plug-in piece, into which the connecting pin and / or the connecting member can be inserted overlapping one another and fixed with the clamping screw . In this way, at least one connector pin or all connector pins of the electric hotplate can also be electrically connected in an advantageous manner. Instead of the training described or in addition to this, it is also possible to connect at least one connecting pin or all connecting pins of the electric hotplate directly to the connecting member of the device line, for example via a welded connection, the connecting member being connected directly through the associated line end of the device line without the use of further parts or is preferably formed by a wire end sleeve, which is attached to this line end by squeezing or the like and holds the individual wire strands of the flexible device line together as a socket. Possibilities of such training can be found in German patent application P 37 28 528.9, to which reference is made for further details

At least one plug-in sleeve can also be used as an electrical plug-in connection for connecting electric hot plates, whereby electric hot plates are usually to be connected in two, three or four poles. Such receptacles expediently have an electrically conductive receptacle body which creates a cable connection for the electrically conductive and mechanically secured connection to the electrical supply cable and, if appropriate, a plug-in part which adjoins this in the longitudinal direction and can be pushed onto a plug. In order to secure the receptacle in addition to its non-positive or frictional connection to the plug against at least one of the components in engagement with it against retraction against its plugging direction, a rearward-facing or acting withdrawal stop is advantageously provided on the receptacle body. of the socket, for example secure against pulling out of an insulating body surrounding it or another of the components mentioned.

Electrical plug connections subject to thermal or similar loads, in particular those which are provided on electric hotplates and are therefore continuously exposed to strong temperature fluctuations, can become so loose over time as a result of scaling, rusting and similar influences that the electrical line connection is interrupted. On the other hand, such plug connections are desirable because of the simplicity of assembly and because of the easy interchangeability of the electrically connected unit.

To achieve the object on which the invention is based or, in particular, to create a plug-in sleeve of the type mentioned, which, with a simple construction and easy assembly, ensures a further improved and, in particular, permanent positional securing in the plug-in state, is according to the invention provided that the receptacle body has a push stop which rigidly limits the plug-in movement of the plug-in sleeve in its push-on direction compared to another component, in particular a component separate from the plug, so that the plug-in sleeve can assume or take a precisely defined end position in relation to this direction of movement conversely, the further component, in particular the insulating body, can be placed on the receptacle in such a way that it assumes a precisely limited end position with respect to the latter. The push stop is advantageously behind the front end of the plug part or behind the center of its length or even behind the entire plug part, so that it is provided outside the zone in which particularly high temperatures or thermal and / or electrical loads may occur. If at least one retraction stop acting in the opposite direction is preferably provided in addition to the advance stop, the plug sleeve can be secured in position in both opposite directions with almost no play and in a form-fitting manner with respect to the further component or to the further components.

The insulating body mostly serves to align the connecting wires of the electric hotplate provided with the plugs with respect to the hotplate body, for example in that the insulating body rests with alignment surfaces in the area of the underside on the hotplate body or on its outer flange edge. In the case of the aforementioned fixing of the socket relative to the insulating body by means of stops, the socket is also kept exactly aligned with the hotplate body or, conversely, the insulating body is not only secured against movements in the direction of the central axis of the hotplate body by having corresponding shoulder surfaces on the outer circumference of the Hotplate body rests, but it is also positively secured against movement in the opposite direction in that it is locked by the pushing stop of the plug-in sleeve.

The push stop can have a low, relatively hard elasticity, so that it deviates slightly due to the counter pressure of the counter stop, e.g. until the retraction stop has reached the stop position, the push stop resetting after relief, so that the further component having the counter stops is then prestressed and held free of play between the stops. The push stop can, however, also be designed to be essentially rigid with respect to the plug-in sleeve, with in any case a slight longitudinal play of the plug-in sleeve between the two stop positions can also be provided for corresponding applications. The receptacle is also suitable for electrical plug connections other than those of electric hot plates.

Although it is conceivable to form at least one advance stop and / or at least one retraction stop by a separate part fastened to the plug-in sleeve or to the plug-in sleeve body, the respective stop is preferably formed in one piece with the plug-in sleeve body, all stops expediently in particular, all the feed stops are integrally formed on the socket body. The respective stop can be formed, for example, by a simple, leg-shaped or web-shaped angling of the socket body, the respective stop expediently projecting outward beyond the outside of the outer delimitation planes of the plug part or lying completely outside the plug opening. Furthermore, the advance stop can also by an anyway provided on the socket body, lying transversely to the direction of insertion and facing forward, for which the front edges of a clip-like, rear shaft end of the socket sleeve body are particularly suitable for enclosing the associated end of the insulating jacket of the connecting cable connected to the socket to form a structural unit serves.

In order to achieve a more precisely defined stop position, either only a single push stop is provided or at most two push stops are provided, which are preferably in the same stop plane and are not, as is also conceivable, offset in the longitudinal direction of the plug-in sleeve. The same also applies advantageously to the retreat stop.

The counter-stop for the advance stop or stops could indeed lie within the further component, namely in particular the insulating body, but the reaching of the stop position can be controlled particularly well if this counter-stop is formed by the rear end face of the insulating body or the like. The counter-stop for the retraction stop, on the other hand, is expediently located behind the center of the length of the insulating body, and it can be at a distance from the counter-stop for the advance stop or from the rear end face of the insulating body, which is at most as large as the material thickness that must be provided between the counter-stops in order to maintain sufficient strength on the insulating body.

If the advancement stop and the retraction stop are on opposite sides, in particular flat sides, of the plug-in sleeve, then in particular the retraction on blow by slight tilting movements of the socket in a simple manner into its stop position in the manner of a latch or snap member. If, on the other hand, the abovementioned stops lie opposite one another on the same side of the plug-in sleeve, the engagement can be facilitated by transverse movements, in particular when the single push-in stop, for example, is offset laterally with respect to the withdrawal stop or with respect to the longitudinal center plane of the plug-in sleeve. In any case, however, the stop or the stops lie laterally within the side edges of the plug-in part and / or laterally outside the cable connection shaft.

The socket body is expediently formed as a stamped and bent part made of sheet metal, so that the plug part forms a longitudinal gap on one side, which is delimited by the mutually facing longitudinal edges of two sleeve or bending tabs. In particular, these bending tabs can form elongated contact springs, for example by flanging the longitudinal edge regions, which slide or abut the connector with a relatively high spring pressure. However, such flanges usually only have a linear contact system, which can lead to high surface pressures and to an undesirably difficult stiffness when plugging on, which is particularly disadvantageous when. a plurality of receptacles combined to form a structural unit are to be plugged onto a corresponding number of plugs at the same time, since the stiffness can then be increased by a factor of this number. Despite good contact suspension, this can be avoided in that the contact springs are leaf or strip-shaped and therefore form a correspondingly wide sliding or contact surface for the flat plug. The total width of this sliding or contact surface on one side of the plug-in part can be in the order of magnitude, for example Half of the width of its flat side. Furthermore, it is advantageous if the contact springs are set back relative to the front and / or the rear end of the plug-in part or are shorter than the plug-in part, and their effective contact surface for the plug can have a length that is less than half the length of the Plug-in part.

Another important advantage can be achieved in that the respective contact spring forms an insertion slope for the flat plug at the front end, which e.g. can be achieved in that the front end integrally connects to the jacket of the plug-in part, while both side edges of the contact spring are exposed and a side edge can be formed directly by the longitudinal edge of the associated sleeve tab. Each of the two adjacent contact springs, the rear ends of which can also merge in one piece into the jacket or the sleeve tab of the plug-in part, extends over more than half the width of the associated sleeve tab.

A particularly advantageous development of the subject matter of the invention is that contact springs which are opposite one another and abut on sides of the plug which face away from one another are provided, with two contact springs each expediently lying opposite one another in pairs and having approximately the same width. The opposing contact springs, however, expediently have sliding or contact surfaces of different lengths, one contact spring being formed by an embodiment which is flatly curved in a side view, forming an approximately only linear sliding or contact surface which is continuous over its width, and the sections rising at an acute angle, while the other Contact spring has a longer, approximately rectilinear apex section which merges into end sections angled at an obtuse angle. The curved or linear sliding and contact surfaces forming contact springs are expediently located in the area of the sleeve tabs, while the contact springs with an elongated apex section advantageously connect on both sides directly via cut-free punched edges to the side edges of the withdrawal stop. This retraction stop expediently protrudes to its free, rearward end at an acute angle over the associated outside of the plug-in part, its front and rear ends may coincide essentially with the associated ends of the adjacent contact springs, so that the aspect ratios specified for these also the withdrawal stop apply.

Due to the design described, the plug-in part is formed by a front and a rear, each clamp-like jacket part, which are connected to one another via a plurality of longitudinal webs spaced apart over the circumference or whose connecting part has a plurality of longitudinal slots distributed over the circumference, lateral, to the Flat longitudinal webs lying on the narrow sides of the plug-in part are narrower than these narrow sides and can only be slightly wider compared to the thickness of the plug. The longitudinal webs on the flat sides are formed exclusively by the contact springs.

For locking the longitudinal securing of the plug-in sleeve with respect to the plug, the plug-in sleeve can have a spring cam which projects into its plug-in opening between its ends and which engages in a corresponding recess or opening in the plug. According to the invention, this spring cam is not on the side of the sleeve tabs opposite the Plug part, but provided in the area of the sleeve tabs, it nevertheless lies in the longitudinal median plane of the plug part by appropriate shaping of the longitudinal edges of these sleeve tabs. So that the longitudinal slot between the sleeve tabs does not have to be displaced laterally with respect to the longitudinal center plane over its entire length for this purpose, it is only offset in the area of the spring cam, while the longitudinal sections of the longitudinal slot which adjoin to the front and / or rear are provided in this longitudinal center plane. This also creates a tab-shaped projection that supports or forms the spring cam and projects laterally, which ensures particularly good spring properties. In any case, it is advantageous if the spring cam is provided in the area or on a contact spring and is preferably offset slightly forwards from its apex or from the middle of its length, so that it has fewer cross-sections in the direction of the insertion end of the plug-in sleeve Angle degrees is inclined and directly adjoins the insertion slope.

• Fig. 1 eine erfindungsgemäße Elektrokochplatte in Ansicht auf die Unterseite,
• Fig. 2 die Elektrokochplatte gemäße Fig. 1 im Teil­schnitt,
• Fig. 3 einen Ausschnitt der Elektrokochplatte in Ansicht von rechts gemäß Fig. 2, jedoch ohne Anschlußmittel
• Fig. 4 eine weitere Ausführungsform von Anschluß­mitteln einer Elektrokochplatte im Quer­schnitt rechtwinklig zur Kochfläche,
• Fig. 5 die Anschlußmittel gemäß Fig. 4 im Schnitt parallel zur Kochfläche,
• Fig. 6 einen Isolierkörper der Anschlußmittel im Querschnitt rechtwinklig zur Kochfläche,
• Fig. 7 den Isolierkörper gemäß Fig. 5 in Ansicht von rechts,
• Fig. 8 und 8a weitere Ausführungsformen in Darstellungen entsprechend Fig. 4.,
• Fig. 9 die Anschlußmittel gemäß Fig. 8 in Ansicht auf die Unterseite der Elektrokochplatte,
• Fig. 10 und 11 eine weitere Ausführungsform in Darstellun­gen entsprechend den Figuren 4 und 5,
• Fig. 12 und 13 eine weitere Ausführungsform in Darstellun­gen entsprechend den Figuren 8 und 9,
• Fig. 14 und 15 eine weitere Ausführungsform in Darstellun­gen entsprechend den Figuren 4 und 5,
• Fig. 16 und 17 eine weitere Ausführungsform in Darstellun­gen entsprechend den Figuren 8 und 9,
• Fig. 18 den Isolierkörper gemäß Fig. 16 in Ansicht von rechts,
• Fig. 19 einen Ausschnitt einer erfindungsgemäßen Stapeleinrichtung zur Stapelung von Elek­trokochplatten gemäß den Figuren 1 bis 3, im Querschnitt,
• Fig. 20 eine weitere Stapeleinrichtung für diesel­ben Kochplatten in einer Darstellung ent­sprechend Fig. 19,
• Fig. 21 eine gesamte, einen Transportstapel bilden­de Stapeleinrichtung in vereinfachter Dar­stellung,
• Fig. 22 eine Draufsicht auf eine Stapellage der Stapeleinrichtung gemäß Fig. 21 in ver­größerter Darstellung,
• Fig 23. die Stapeleinrichtung gemäß den Figuren 21 und 22 in einer Darstellung entsprechend Fig. 20,
• Fig. 24 und 25 zwei weitere Ausführungsformen von Stapel­einrichtungen für Elektrokochplatten mit Isolierstücken in Darstellungen entsprechend den Figuren 19 und 20,
• Fig. 26 eine Steckhülse in ihrer erfindungsgemäßen Zuordnung zu einer Elektrokochplatte in teil­weise geschnittener Seitenansicht,
• Fig. 27 den Isolierkörper gemäß Fig. 26 in Seitenan­sicht,
• Fig. 28 den Isolierkörper gemäß Fig. 27 in Ansicht von rechts,
• Fig. 29 eine weitere Anordnung in einer Darstellung entsprechend Fig. 26,
• Fig. 30 die Steckhülse gemäß Fig. 26 in vergrößerter Darstellung,
• Fig. 31 die Steckhülse gemäß Fig. 30 in Seitenan­sicht,
• Fig. 32 die Steckhülse gemäß Fig. 30 in Ansicht auf die Rückseite,
• Fig. 33 die Steckhülse gemäß Fig. 30 in Ansicht auf das vordere Ende,
• Fig. 34 ein weiteres Ausführungsbeispiel einer Steck­hülse in einer Darstellung entsprechend Fig. 30,
• Fig. 35 die Steckhülse gemäß Fig. 34 in Seitenansicht gemäß Fig. 31, jedoch in ihrer Zuordnung zum Isolierkörper,
• Fig. 36 die Steckhülse gemäß Fig. 34 in Ansicht auf die Rückseite,
• Fig. 37 die Steckhülse gemäß Fig. 34 in Ansicht auf das vordere Ende und
• Figuren 38 - 45 zwei weitere Ausführungsformen von Steck­hülsen in Darstellungen entsprechend den Figuren 30 bis 33.

These and further features of preferred developments of the invention are evident from the claims and also from the description and the drawings, the individual features being implemented individually or in groups in the form of sub-combinations in one embodiment of the invention and in other fields, and can represent advantageous and protectable versions for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:

• 1 is an electric hot plate according to the invention in a view of the underside,
• 2 the electric hotplate according to FIG. 1 in partial section,
• Fig. 3 shows a detail of the electric hot plate in a view from the right according to FIG. 2, but without connecting means
• 4 shows a further embodiment of connection means of an electric hotplate in cross section at right angles to the cooking surface,
• 5 shows the connection means according to FIG. 4 in section parallel to the cooking surface,
• 6 an insulating body of the connection means in cross section at right angles to the cooking surface,
• 7 the insulating body according to FIG. 5 in a view from the right,
• 8 and 8a further embodiments in representations corresponding to FIG. 4,
• 9 shows the connection means according to FIG. 8 in view of the underside of the electric hotplate,
• 10 and 11 a further embodiment in representations corresponding to Figures 4 and 5,
• 12 and 13 a further embodiment in representations corresponding to Figures 8 and 9,
• 14 and 15 a further embodiment in representations corresponding to Figures 4 and 5,
• 16 and 17 a further embodiment in representations corresponding to Figures 8 and 9,
• 18 shows the insulating body according to FIG. 16 in a view from the right,
• 19 shows a section of a stacking device according to the invention for stacking electric hotplates according to FIGS. 1 to 3, in cross section,
• 20 shows a further stacking device for the same hot plates in a representation corresponding to FIG. 19,
• 21 shows an entire stacking device forming a transport stack in a simplified representation,
• 22 is a plan view of a stack position of the stacking device according to FIG. 21 in an enlarged view,
• 23 shows the stacking device according to FIGS. 21 and 22 in a representation corresponding to FIG. 20,
• 24 and 25 two further embodiments of stacking devices for electric hot plates with insulating pieces in representations corresponding to FIGS. 19 and 20,
• 26 a plug sleeve in its assignment according to the invention to an electric hotplate in a partially sectioned side view,
• 27 the side view of the insulating body according to FIG. 26,
• 28 the insulating body according to FIG. 27 in a view from the right,
• 29 shows a further arrangement in a representation corresponding to FIG. 26,
• 30 shows the plug-in sleeve according to FIG. 26 in an enlarged representation,
• 31 is a side view of the receptacle according to FIG. 30,
• 32 the plug-in sleeve according to FIG. 30 in a view of the rear,
• 33 shows the plug-in sleeve according to FIG. 30 in view of the front end,
• 34 shows a further exemplary embodiment of a plug-in sleeve in a representation corresponding to FIG. 30,
• 35 is a side view of FIG. 31, but in its assignment to the insulating body,
• 36 shows the plug-in sleeve according to FIG. 34 in a view of the rear,
• Fig. 37 the receptacle according to FIG. 34 in view of the front end and
• FIGS. 38-45 show two further embodiments of receptacles corresponding to FIGS. 30 to 33.

The electric hotplate 1 according to Figures 1 to 3 has a one-piece cast-iron body 2, which forms a flat annular cooking surface 3 at the top, which in the case of the performance shown as an automatic hotplate has an opening in the center for receiving a temperature sensor and in In the case of power-controlled normal hot plates, it is closed continuously. The hotplate body forms a circumferential collar 4 on the outer circumference and, on the other hand, is offset slightly inward on the underside by a protruding outer flange edge 5 and is generally rotationally symmetrical about its central axis 6. Within the flange 5, one or more heating resistors 7 in the form of heating coils are laid in the underside of the hotplate body 2 and are embedded in a mineral, pressed insulating compound in grooves running spirally about the central axis 6. This ring-shaped, heated zone is delimited on the inner circumference by an inner flange edge 8 which projects less far than the flange edge 5, whereby in the case of hotplate bodies with a closed surface in the center a one-piece center pin protrudes at the bottom, which then instead of the flange edge 8 for fastening a lower cover 9 serves in the form of a sheet metal cover, which is supported with its outer ring edge 10 on the end face of the flange edge 5 and secured with screws 11 or the like.

The profiled cover 9 forms depressions 12, 13 on the underside, of which an approximately long-round depression 13 is provided approximately symmetrically to an axial plane 14 of the hotplate body 2. On the outer circumference of the hotplate body 2, a support ring 15 is fastened which is supported on the circumferential collar 4 and which, in the assembled state of the electric hotplate 1, engages over the edge of the assembly opening in the hob and is tensioned against the top of the hob.

Each heating resistor 7 generally has a short end pin 16 projecting downward from the insulating compound at both ends, which is used for connection to an associated connecting wire 17, which is also part of the preassembled electric hotplate 1. Each connecting wire 17 has a section 18 lying inside the cover 9, connected to the associated end pin 16, for example by spot welding, and a connecting pin 19 lying outside the cover 9 or the hotplate body 2, essentially on the underside thereof, and is from the end pin 16 to the end of the pin 19 throughout in one piece. In the area of the recess 13, an insulating piece 20 made of ceramic material, for example steatite, is inserted into a corresponding window-like opening 23 of the cover 9 and has one for each connecting wire 17 Has passage opening. On both sides of this lead-through opening 21, each connecting wire 17 is angled once, either in opposite or the same directions and thereby fixed at right angles to the cooking surface 3. The outer or lower bend 22 can form a hinge zone for the associated connecting pin 19 with a hinge axis that is approximately perpendicular to the axial plane 14. On the lower or outer end face 26, the insulating piece 20 has a groove-like cutout 25 for each connecting wire 17 or pin 19, these cutouts 25 connecting to a receiving recess 27 which is formed in the underside of the cover 9 and also in the lower end face of the flange edge 5 and in the circumferential part of the ring edge 10 adjacent in the associated area is provided. As a result, all the connecting pins 19 can be arranged, at least in a stacked position, despite being led out over the outer circumference of the flange edge 5 such that they do not protrude beyond the plane of the underside of the hotplate body 2 or the cover 9 or its ring edge 10, the ring edge 10 expediently being the deepest Area of the cover 9 and the entire, in the stacked state electric hotplate forms.

In the circumferential direction at a distance from the receiving recess 27 there is also a positioning member 28 in the underside of the electric hotplate 1 for the precise rotational alignment of the electric hotplate 1 during assembly, and this positioning member 28 is expedient due to a groove-like cutout in the end face of the flange edge 5 and a stamped projection formed in the ring edge 10, which engages in this cutout on the one hand and on the other hand a slightly smaller one compared to this cutout open positioning cutout limited. As a result, the cover 9 is also precisely defined in its rotational position with respect to the hotplate body 2.

At the end of each of the connecting pins 19 of the same length, a plug 29 is fastened, the plug direction of which is approximately radial to the electric hotplate 1 or approximately parallel to the axial plane 4 and is directed outwards. Each of the essentially flat plug-in pieces 29 is fastened with a lateral flat surface laterally to the periphery of the associated connecting pin 19 by spot welding, so that it extends in plan view of the electric hotplate with its rear end approximately to the outer circumference of the electric hotplate or the support ring 15. The plug pieces 29 are formed by tabs. Each plug 29 is assigned a mating connector 100, in particular a plug-in sleeve, which is attached to the associated end of a device line 34 via a crimp connection 35 and forms a plug opening 36 for receiving the plug 29.

In Fig. 2, in addition to the mating connector 100, an insulating body 32 is indicated by dash-dotted lines, which expediently surrounds all the plug-in pieces 29 essentially over the entire circumference and at least over part of their length, so that a connector 31 preassembled with the electric hotplate 1 with all the electrical connecting parts is formed in the form of plug pieces 29. A ground connection that may be provided is attached separately to the cover 9, for example. The insulating body 32 thus forms a housing 37 which accommodates at least the rear ends of the plug-in pieces 29 and a substantially flatter extension 38 which adjoins this at the rear and which is provided with a gradation such that it extends both on the outer circumference of the flange edge 5 and on the underside in the area of the Ringran of 10 can concern. 2 shows the stack position of the plug-in pieces 29, in which the connecting pins 19 can still be in metallic contact with the cover 9; in this stacked position, the insulating body 32 is not yet in contact with the hotplate body 2 in the illustrated position, but rather in a different securing position. From the stack position, the plug pieces 29 are pivoted downward together, for example, so that the connecting wires 17 become completely contact-free with respect to the hotplate body 2 and the cover 9, and in this connection position the insulating body 32 then lies against the electric hotplate 1 in the manner described. Each plug-in piece 29 has a securing member 39, which is bent out of it laterally in one piece, in the form of a barb-like snap tongue which projects obliquely to the rear and which is assigned a latching or latching opening or shoulder in the insulating body 32.

If the insulating body 32 is plugged onto the free ends of the plug-in pieces 29, the securing members 39 come into the latching openings when the insulating body 32 has reached the final or final assembly position, and at the same time the attachment 38 lies on the electric hotplate 1 in the manner described so that the insulating body is blocked in both directions or can even be clamped between the electric hotplate 1 and the plug pieces 29. The receiving recess 27, in which the connecting wires 17 or the connecting pins 19 lie in the stacked position, is chosen so wide that it can accommodate any number of connecting pins 19 that occur, namely, for example, two to four adjacent connecting pins 19. Each plug 29 is attached to the associated pin 19 with a spot weld 40.

As further shown in FIG. 2, each connector pin 19 is provided between the insulating piece 20 or the bend 22 with at least one bend 41, which is advantageously obtuse in the side view according to FIG. 2 such that the plug 29 in the stacked position between the delimitation levels Electric hotplate 1 lies and is aligned radially to the central axis 6. In the exemplary embodiment shown, a bend 41 is provided in the region of the end face of the flange edge 5 or the ring edge 10 and a bend laterally in the region of the rear end of the plug-in piece 29. This angled portion 41 according to the invention can also be provided in the case of hot plates designed differently than the electric hot plates described, e.g. for electric hotplates, in which no connector is provided at the end of the connecting pins, but these connecting pins end freely.

The bend 41 suitably lies between the bend 22 and the end of the connecting pin 19 such that it can be pivoted approximately into the region of the end face of the flange edge 5. However, it can also lie further inwards or outwards with respect to this edge flange 5 radially to the central axis 6, as can be seen in FIGS. 4 to 17, but its radial distance from the flange edge 5 is only approximately in the order of its thickness. The angle of the bend 41 is expediently chosen so that when the connecting wire 17 is pivoted against the underside of the hotplate body, the section of the connecting pin 19 lying radially outside the bend 41 runs obliquely in the direction of the plane of the cooking surface 3, while the one lying radially inside the bend 41 rectilinear section of the pin 19 to Angle 22 is provided parallel to the cooking surface 3 or to the underside of the hotplate body 2 and is completely sunk inside the underside of the electric hotplate 1.

Furthermore, the angle of the bend 41 is chosen so that when the connecting wire 17 is pivoted into its functional position away from the underside of the electric hotplate 1, the free end section of the connecting pin 19 or the plug 29 is at least approximately or essentially parallel to the plugging direction Cooking surface 3 is aligned. However, an angle deviating at least slightly, for example approximately +/- 10 °, can also be provided.

A particularly advantageous development of the subject matter of the invention can also consist in that at least one, in particular all, plug-in pieces 29 are arranged instead of standing in such a way that their larger cross-sectional extent is provided approximately parallel to the cooking surface 3, the respective plug-in piece 29 expediently in a stacked position and / or in Installation or functional position is parallel to the cooking surface 3, so that, for example, all the plug pieces 29 are provided in a common plane. Intermediate stages or intermediate layers can also be advantageous. Such an arrangement is particularly suitable for those electric hotplates which have a small number of connections, for example only two or three connections, it being possible to save a considerable part of the relative installation height through this design.

In FIGS. 4 to 25, the same reference numerals are used for corresponding parts as in the other figures, but each with different letter indices, the corresponding descriptions correspondingly applying to corresponding parts.

As FIGS. 4 to 7 show, the housing 37a of the insulating body 32a has a through opening adapted to its cross-section for receiving each plug-in piece 29a, which extends into the area of the extension 38a and extends backwards over the rear of the housing 37a also continues as a trapezoidal groove, so that when the insulating piece 32a is placed, the plug pieces 29a are first inserted into these grooves transversely to their plugging direction and then the insulating piece 32a can be displaced into its end position approximately parallel to the plugging direction of the plug pieces 29a by relative displacement until the securing members 39a engage and the stepped surface of the extension 38a rests on the electric hotplate shown only indicated.

As indicated by dash-dotted lines in FIG. 4, the mating connector 100 can also be provided with the or an insulating body 48, which expediently surrounds the metallic or current-carrying parts of the mating connector essentially over the entire circumference and / or over the entire length. Instead of designing this insulating body so that it also forms the insulating body for the plug-in pieces, the connecting pins or the like., Its design is expediently chosen such that it forms a part which essentially joins the insulating body 32a without gaps and also itself as a plug-in part for the plug connection can be formed with the insulating body 32a. In the exemplary embodiment shown, the insulating body 48 overlaps the housing 37a of the insulating body 32a over the entire circumference with an edge flange 49, wherein the two insulating bodies 32a, 48 also butt against one another and together form an overall housing, the housing parts of which are secured against relative movements by the plug-in pieces 29a engaging in the mating connector or corresponding suitable securing members. As a result, the live parts of the connector are also protected against splash water and similar loads. As shown in FIG. 5 in particular, the plug-in pieces 29 have angled leg tongues at their rear ends, with which they bear against the rear of the housing 37a or a corresponding counter surface, so that the insulating body 32a is limited in its plug-on direction in the end position by these leg tongues, while being locked in the opposite direction against movement by the securing members 39a.

In the embodiment according to FIGS. 8 and 9, the shoulder 38b increases on its side facing away from the step 42, over which the housing 37b also projects exclusively, in thickness approximately to the height of this housing 37b, so that the grooves 43b mentioned increase in depth towards the housing 37b. While the grooves 43 run out in the case of the embodiment according to FIGS. 4 to 6 in front of the rear end of the extension 38a, in the case of the embodiment according to FIGS. 8 and 9 they extend to the rear end of the extension 38b. While in the embodiments according to FIGS. 1 to 7 the actual plug-in sections of the plug-in pieces 29, 29a project freely over the front of the insulating piece 32, 32a or the housing 37, 37a, in the case of the design according to FIGS. 8 and 9 they are partially inside of the housing 37b and the insulating body 32b, so that only end portions protrude from them. It is also conceivable to design the insulating body so that the plug pieces and possibly the mating connector Device lines are completely within them and are therefore shielded by insulating material over their entire length and circumference. 8, the stacked position of the plug-in pieces is indicated by dash-dotted lines, in which the insulating body 32b is at most pushed so far that it lies completely outside the outer circumference of the outer flange edge 5b. In Fig. 9, the mating connector 100 of the device lines 34b are indicated by dash-dotted lines, and it can be seen that the insulating body 32b forms a funnel-like insertion mouth for each mating connector 100, through which the mating connector 100 easily finds its exact plug position and also in the plugged-on state is positively secured against lateral movements.

In the area of the weld 40b, the plug 29b has on its shaft section also provided with the securing member 39b a type of raised cam 44, which in the exemplary embodiment shown is formed by a bead lying transversely to the longitudinal direction of the connecting pin 19b, on both sides of which the shaft section forms securing members 39b can. The shaft section lies in the same plane as the actual plug-in section of the plug-in piece 29b.

In the embodiment according to FIGS. 10 and 11, the shaft section of each plug-in piece 29c is provided with a laterally bent-out connecting leg 46, and the end of each connecting pin lgc is formed by squeezing up to its end face as a flat 45 which is parallel to the connecting leg 46 and is approximately the same Width like this one has. The pin lgc or the flat 45 is located nevertheless expediently also on the side of the plug 29c, although their connecting surface is provided transversely to the plane of the plug 29c.

While in the designs described so far the pins are so long that they protrude in practically any position over the outer circumference of the hotplate body, in the case of the embodiment according to FIGS. 12 and 13 they are considerably shorter, namely so short that they are essentially in each Position with respect to the envelope surface of the inner circumference of the outer flange 5d are offset inwards. So that the actual shaft section of the plug-in piece 29d, which is used for connection to the insulating body 32d, can nevertheless be made relatively short, a connecting section 47 is provided in this case for connecting this shaft section to the connecting pin 19d, which is practically provided by an extension of the connecting leg 46 protruding towards the rear 10 is formed. The connecting section 47 designed in the manner of a flat-band-shaped connecting lug is placed with its flat side facing the hotplate body 2d against the connecting pin 19d and connected to the latter via a spot weld. In this case, the connecting section 47 expediently has the bends 41d, while the connecting pin 19d is continuously straight from the bend 22d to its end face. As FIGS. 10 to 13 also show, the receiving recess 27c or 27d in relation to the projection 38c or 38d can also be designed in such a way that this projection engages in the receiving recess 27 and rests on the bottom surface thereof, so that the insulating body 32c or . 32d is additionally secured against lateral movements and can also be relatively high.

While in the previously described embodiments a single insulating body is provided for all plug-in pieces, according to FIGS. 14 and 15 a separate insulating body 32e is provided for each plug-in piece 29e, which can be designed in the manner of a tube with a flat cross section. This means that one and the same insulating body 32e can be used regardless of how many connections an electric hotplate has. As shown in FIG. 14, the mating connector 100 receiving the plug 29e lies essentially entirely within the insulating body 32e. The insulating body 32e can also be a component preassembled with the mating connector 100, which is only pushed onto the plug 29e when this mating connector 100 is plugged on. On the other hand, the insulating body 32e could also be divided in the longitudinal direction, similar to that described with reference to FIG. 4, so that one part is preassembled with the plug 29e, while the other part is preassembled with the mating connector 100 and these two parts are blunt or interlocking in the installed position bump into each other. As can be seen in FIG. 15, in this case the securing member 39e is provided on the mating connector 100 or bent out of it. The insulating body 32e can be plugged onto the mating connector 100 in such a way that it is secured against movements in both possible directions in a substantially positive manner.

In the embodiment according to FIGS. 16 to 18, a plug-in socket is provided in the insulating body 32f as a plug-in piece 29f, the socket bore of which is designed both for receiving the end of the connecting pin 19f and for receiving the associated end of the device line. The plug-in piece 29f is provided with a radial clamping screw 39f, which simultaneously secures its position and clamps the flat 45f as well as the end of the device line. The housing 37f of the insulating body 32f has on both sides of the clamping screws 39f protruding projections in the form of lateral webs, so that the heads of the clamping screws 39f accessible between them are shielded against metallic contact.

Different stacking aids 101 are shown in FIGS. 19 to 25, although in spite of different designs and applications, essentially the same reference numerals are used in all these figures for corresponding parts. The stacking aid 101 has a multiplicity of pallet plates 110 to be arranged one above the other and relatively soft or elastic inserts 111 to be arranged between adjacent stacking layers and is essentially carried by a lower carrying pallet 112. On this carrying pallet 112 there is a packaging sleeve 113 made of a cardboard box 114 with a removable packaging lid 115, on the top of which a clamping plate 116 for tensioning the entire packaging sleeve 113 relative to the carrying pallet 112 with tensioning straps is to be arranged. The multi-layer stack 117 of stack layers 118, which each accommodate a plurality of electric hotplates in a grid of rows and rows, is located within the packaging sleeve 113.

The respective pallet plate 110 forms a flat shell 119, adapted to this, for receiving each electric hotplate, with a shell bottom 120, the underside of which serves as a support surface 121 for support against the next stacking layer underneath and whose shell jacket 122 essentially accommodates the associated electric hotplate, the Shell openings 123 are on top. The depth of the flat shells 119 or, in contrast, the same height of each pallet plate 110 is significantly smaller than that Installation depth of the associated hotplate, the installation depth of which is essentially defined by the distance between its underside and the support ring.

Each pallet plate 110 forms a central plate field 126 which receives the flat shells 119 and is delimited on the outer circumference by a peripheral edge 127. A circumferential depression in the form of a groove 128 adjoins the peripheral edge 127, the groove bottom 129 of which lies in the plane of the shell bottoms 120. The peripheral edge 127 forms an outward-facing edge flange 130. A slip guard 131 is expediently provided between adjacent stack layers, which can be formed by the corresponding properties of the inserts 111.

The stacking aid 101 according to FIG. 19 essentially serves for stacking electric hot plates 1h which are designed similarly to those according to FIGS. 1 to 3, but have not yet been preassembled with an insulating body. Electric hot plates 1h lying one above the other are axially aligned with one another, and each connecting piece 31h lies between the delimitation planes of the associated electric hotplate 1h adjacent to the latter essentially within the associated pallet plate 110. A groove-like recess or depression can be provided in the shell casing of the associated flat shell, into which the connecting pins then engage in such a way that the connecting pieces 31h or the associated plug-in pieces lie outside of this flat shell.

19 the electric hot plates 1h are stacked in such a way that all the cooking surfaces are at the top, according to FIG. 20 the arrangement is reversed, namely in such a way that all the cooking surfaces are at the bottom, which, according to FIGS. 4 to 16, also corresponds to the mounting position of the Electric hot plates equals. In this case, the connecting pieces 31i each lie relatively high above the tray bottom of the pallet plate 110 carrying the associated electric hotplate 1i and protrude freely between two stacked pallet plates 110.

In the embodiment according to FIGS. 21 to 23, the arrangement is provided in such a way that electric hotplates 1k which are directly stacked one above the other are offset eccentrically, approximately in the direction of a diagonal of the stacking aid 101, which is essentially rectangular in plan, by an amount approximately equal to that Distance between the insulating piece 26k and the outer circumference of an electric hot plate corresponds. However, the electric hot plates 1k of each second stacking layer, which are stacked one on top of the other, are in turn aligned with one another. The electric hotplates 1k are arranged such that their connecting pieces 31k point in the direction in which superimposed electric hotplates are offset from one another in the manner described, the connecting pieces 31k pointing in opposite directions from electric hotplates 1k lying directly one above the other and offset in this way. For the connecting piece 31k of each electric hotplate, an opening 132 of corresponding size is provided in the pallet plate lying above or supported on it, which opening is in each case directly adjacent to the outer circumference of a flat shell 119 of this overlying pallet plate and in which the connecting piece 31k of the electric hotplate 1k below can engage. As a result, the connecting pieces 31k can be connected to the electric hotplates 1k in a fully assembled state without an increase in the stack, even though the connecting pieces 31k protrude above the undersides of the electric hotplates 1k located above.

In Fig. 24 a stacking aid 101 is indicated, with which the electric hot plates 1m can be stacked in a space-saving manner, despite the pre-assembled insulating body 32m, so that no greater stack height than that required by the height of the hotplate body plus the material thickness of the lower cover 9m is required . The insulating body 32m is only partially plugged onto the plug-in pieces 29m in such a way that it lies completely outside the flange edge 5m and is possibly supported with its shoulder 38m on the outer circumference of this flange edge 5m. As a result, the entire connecting piece 31m, including the insulating body 32m, can lie between the upper and lower delimitation levels of the electric hotplate 1m. The electric hot plates Im are stacked according to FIG. 24 with a cooking surface 3m lying on top and lying one above the other in the same axis.

25, the electric hot plates In are stacked in a similar manner with the cooking surfaces lying at the bottom, the insulating bodies 32n likewise being only partially plugged onto the plug-in pieces 29n and therefore in a stacked position between the delimitation levels of the respective associated electric hotplate or between the delimitation levels of their installation depth lie.

According to the invention, a receptacle 100 according to FIGS. 26 to 33 can also be designed as a mating connector, in conjunction with two or more flat, identical receptacles arranged parallel to one another, plugged onto plug 202 in the form of essentially flat tabs and from an insulating body 203 so to be sheathed at least in its front area, so that the plugs 202 and the corresponding sections of the receptacles 100 are sheathed in mutually separate insulating chambers in such a way that the plugs 202 are completely inside the insulating body 203 lie, whereby the desired plug connection 204 is created as an electrical connection of an electric hotplate 205. The electric hotplate 205 is used for mounting in a hob 206 and has a cast-iron hotplate body 207, a support ring 208 projecting over its outer circumference for support on the top of the hob 206, on the underside an end cover 209 made of sheet metal, an insulated sleeve fastened in this recess 211 for the passage of connecting wires 210 and on the hotplate body 207 on an outer, through the hob 206 in the region of an opening, jacket-shaped flange 212 on whose end face remote from the cooking surface 213, the end cover 209 rests.

When assembling and electrically connecting the electric hotplate 205, the procedure according to the invention is expediently such that the electric hotplate 205 is initially placed with its cooking surface 213 down, possibly with further hotplates to be fastened in the same hob 206, on a support surface and then the hob 206 is placed in the reverse position on the flange edges 212 of the electric hot plates and is braced with them so that the support rings 208 of the electric hot plates 205 are supported under tension on the use side of the hob 206. In the upside-down position or in the position of use, the plug sleeves 100 are connected to the plugs 202 forming a self-contained structural unit with the respective electric hotplate 205.

The plugs 202 of each electric hotplate 205 are flat components which are elongated in their plug-in direction and which, with the rear end, form a plug shaft 214 on which the free end of the associated connecting wire tes 210 is fixed laterally overlapping, for example by spot welding, so that the plug 202 lies completely outside the outer periphery of the flange rim 212 or the hotplate body 207 or the support ring 208 and around a bending point of the connecting wire 210 in a region of the insulating sleeve 211 in a to the cooking surface 213 is pivotable about a right-angled plane. The front, via a short, widened intermediate section adjoining the plug shaft 214, the shorter end of the plug 202 forms the actual plug-in member 215, which is directed outward with respect to the circumference of the electric hotplate 205, as far as the plug-in members 215 protrude from all other associated plugs 202 and is provided parallel to these, in particular in a plane perpendicular to the cooking surface 213. The plug member 215 is provided approximately in the middle of its width and the middle of its length with a plug opening in the form of a circular opening and has a short plug tip 217 lying in front of the plug opening 216, which by chamfering both the broad sides and the narrow edges of the plug member 215 is formed.

The longitudinally flat rectangular insulating body 203 has essentially flat end surfaces 218, 219, which are perpendicular to its longitudinal direction and are penetrated by a number of straight receiving channels 220 for the plug connections, corresponding to the number of plugs 202 and / or receptacles 100. In the side walls of these receiving channels 220, narrower, groove-shaped recesses 221 are provided, which extend from the front end surface 218 to close to the rear end surface 219 and whose transverse wall forming the rear end is suitable in each case as a counter stop 222 for a stop of the plug connection 204. The counter stop 222 or the recess 221 is located approximately in the middle of the width of the associated side wall of the receiving channel 220 and has a smaller width than this. The cross-section of the respective receiving channel 220 is relatively closely matched to the outer cross-section of the associated plug-in sleeve 100, so that it can engage with almost no backlash, the widened section of the plug 202 also being correspondingly adapted to the associated cross-sectional dimension of the receiving channel 220. The associated end of the connecting wire 210 can then lie in one of the recesses 221 at the latest after the plug connection 204 has been produced.

The plug connection 204 or the insulating body 203 also has means for alignment with the hotplate body 207, which in the exemplary embodiment shown is formed by a stepped alignment shoulder 223 on the upper side of this insulating body 203, starting from the front end surface 218 and extending over the width of the insulating body 203 are. 26, in the fully assembled state, the outer circumference of the outer flange edge 212 engages in such a way that the lower shoulder surface of the alignment shoulder 223 engages over the electric hotplate 205 on the underside of the end cover 209, while the one lying transversely thereto Shoulder surface can rest on the outer circumference of the flange rim 212. The insulating body 203, which is arranged approximately parallel to the cooking surface 213, underneath the hob 206, is thus partially above the underside of the hotplate body 207 or the end cover 209 and projects outward from the outer circumference of the electric hotplate 205 with most of its length.

In an advantageous procedure, the insulating body 203 is preassembled or assembled with the plug sleeves 100 and the associated supply cables 225 carrying these plug sleeves 100 at the respective ends, after which the insulating body 203 is pushed as far as its plug direction arrow 224 onto the plugs 202 until the plug 202 becomes hers Have reached the plug position in the receptacles 100 and end sections of the connecting wires 210 adjoining the plugs 202 lie within the receiving channels 220. The insulating body 203 has then reached the above-mentioned mounting position, the receptacles 100 being able to protrude freely from the rear end surface 219 of the insulating body 203. The plug sleeves 100 are secured against the insulating body 203 in the plug direction arrow 224 and against this direction by stops, while they are secured against the plugs 202 by friction locking and by resilient detent. Only by these means can the insulating body 203 be secured in its assembled position.

29, the assembly can also be carried out in such a way that the insulating body 203 is first pushed onto the plug 202 and the connecting wires 210 without plug sleeves until the plug members 215 protrude beyond the rear end face 219. Then the receptacles 100 are separately or at the same time plugged onto the plug members 215, after which the insulating body 203 is either pushed back into the assembly position described with reference to FIG. 26 or left in the position recognizable from FIG. 29, in the latter case then insulation of the connecting wires 210 is given approximately over its entire length, which is exposed below the electric hotplate 205. The insulating body 203 and / or the insulating sleeve 211 suitably consists of a hard ceramic material, for example steatite.

The respective receptacle 100 is formed according to FIGS. 30 to 33 by a one-piece receptacle body 228 made of sheet metal, the front end of which is shaped into a flat sleeve-shaped plug part 229 which is slotted longitudinally over its entire length and which has an acute rearward width at its rear end tapered transition section 230 merges. The narrower end of this transition section 230, which is considerably shorter than the plug-in part 229, merges into a strand clip 232 which is approximately elliptical in cross-section of a cable connection shaft 231 which is tapered in relation to the width of the plug-in part 229, the rear end of which forms a bending clip 233 which leads directly to the rear end of the stranded clip 232 connects, is wider compared to this, but has a smaller width than the width of the plug-in part 229. The heddle clip 232 is used to clasp the bundle to the cable braid 227, which protrude freely above the cable sheath 226 of the supply cable 225 made of insulating material, the front end of the cable sheath 226 being enclosed by the bending clip 233. The clip legs of the respective clip are directed inwards and are thereby clawed in the cable strands 227 or in the cable sheath 226. The longitudinal slots between the clamp legs of both clips and the only continuous longitudinal slot of the plug-in part 229 lie in a common longitudinal center plane.

At the front end, the plug-in part 229 forms a front end section 234, which is only interrupted by the single, continuous longitudinal slot, the length of which is smaller than the thickness of the plug-in part 229, and a corresponding rear end section 235, which is, however, longer than the front end section 234. These two end sections 234, 235 are connected to one another via an intermediate section, which, apart from the aforementioned longitudinal slot, is subdivided by further longitudinal slots in such a way that it forms two adjacent longitudinal bars on each flat side 236 and 237 of the plug-in part 229, which are offset inwards relative to the narrow sides 238, and a single longitudinal bar 239 on the narrow sides 238, whose width is smaller than the width of this essentially flat narrow side 239 and which lies in the middle of this narrow side.

On a flat side 237, the plug-in part 229 forms two essentially mirror-symmetrical sleeve legs 240, 241 in the area of the end sections 234, 235 and lying in a common plane, the longitudinal edges 263, 264 of which are formed by cut edges and limit the continuous longitudinal slot 242 mentioned. On the flat sides 236, 237, above the levels of which only the bending clip 233 of the cable connection shaft 231 protrudes, all of the longitudinal webs mentioned form plug or contact springs 243, 244, 245, which are formed inward from the level of the respectively associated flat side, parallel to The longitudinal direction of the plug-in part 229 are of the same length and on the respective flat side 236 or 237 are also of the same width, and with their front ends over the full width merge in one piece into the front end section 234 and with their rear ends into the rear end section 235. The longitudinal edges of the constantly wide contact springs 243, 244, 245 on each flat side which face away from one another are offset inwards relative to the associated narrow side 239 by an amount which is greater than the sheet metal thickness of the socket body 228. The longitudinal edges of the corresponding contact springs 243 and 244, 245 lying opposite one another in parallel lie at a distance from one another which is at most as large as their width.

The two contact springs 243, which are provided on the flat side 236 opposite the longitudinal slot 242, are angled at both ends at an obtuse angle and have a straight-line or flat intermediate section between them, the ends adjoining the end sections 234, 235, which are opposite to the associated flat side 236 is offset on the inside that it engages between the longitudinal webs 239, but is non-contact with them. As a result, a vertex 248 parallel to the plugging direction is formed with a length which is substantially greater than half the length of the intermediate section lying between the end sections 234, 235. The contact springs 244, 245, on the other hand, are curved in such a flat manner that their convex, inner curvature sides each form a linear apex 249 that is continuous over their width, but is not offset as far inwards as the apex 248 of the contact springs 243. The apices 248, 249 lie symmetrically to the center of the length of the intermediate section mentioned. Due to the design described, the front ends of the contact springs 243, 244, 245 form with their inner sides insertion bevels 246, 247 for the plug 202, which are provided approximately parallel to the associated flank surfaces of the plug tip 217. In addition, the contact springs 243, 244, 245 lie completely within the flat outer surfaces of the plug-in part 229, wherein they stress the longitudinal webs 239 under tension when expanded.

In the case of the embodiment according to FIGS. 30 to 33, a push stop 250 and a pull back stop 251 are provided for the aforementioned securing against the insulating body 203. The advance stop 250 is essentially formed by the front edge or end surface 252 of the clamp legs of the bending clamp 233, which, according to FIG. 33, over the plane of the associated flat side 237 protrude and which is assigned a corresponding counter-stop at the rear end of the insulating body 203, which can be formed by a corresponding extension of the insulating body 203 by its rear end surface 219, so that from this only the bending clips 233 of the receptacles 100 and not, as in Fig. 26, the rear end portions 235 and the cable connection shafts 231 protrude. As a result, the front end of the cable sheath 226 may also engage slightly in the insulating body.

The retraction stop 251 is designed in the manner of a resiliently deflectable snap member as a flat spring tongue 253, which on the flat side 235 is partly between the contact springs 243 and has a width which is substantially equal to the spacing between these contact springs 243. The continuous rectilinear or flat spring tongue 253 is at an obtuse angle from the rear end edge of the front end section 234, so that it lies essentially completely outside the plane of the associated flat side 236 and approximately over the entire length of the contact springs 243, 244, 245 enough, with its free end edge 254 is provided approximately in the plane of the front end edge of the rear end portion 235. The spring tongue 253 can be pressed resiliently completely into the plane of the flat side 236, its outer side forming a run-up slope when the plug-in sleeve is inserted into the insulating body 203 until the end edge 254 jumps behind the counter-stop 222 as a stop surface. The push stop 250 lies approximately in the plane of the flat side 237 opposite the retraction stop 251. Both stops lie completely outside the delimitation planes of the plug opening 259 of rectangular cross section, into which only the contact springs 243, 244, 245 protrude. Further lie all stops 250, 251 symmetrical to the longitudinal center plane 260 of the plug-in part 229, which is perpendicular to the flat sides 236, 237.

In FIGS. 34 to 45, the same reference numerals are used for corresponding parts as in the other figures, but each with different letter indices, which is why the corresponding parts of the description apply analogously.

In the embodiment according to FIGS. 34 to 37, the advance stop 250a lies in front of the bending clip 233a or the heddle clip 232a in the region of the transition section 230a, such that its stop surface 257 is approximately in the plane of the rear end edge of the rear end section 234a or the Sleeve legs 240a, 241a is provided. The stop 250a is formed by an essentially flat web 255, which projects at right angles over the same flat side 236a as the withdrawal stop 251a. The stop 255, which is bent out of the substantially flat transition section 230a, is offset inward from the adjacent narrow side 238a by approximately half the width of the associated sleeve leg 240a and is formed by the angled edge of the transition section 230a such that its back edge is formed by the associated oblique side edge of the transition section 230a is formed and slopes obliquely from the stop surface 257 to the rear. The web 255 is angled along a bending edge 256 which is parallel to the longitudinal center plane 260a or to the direction of insertion. The rear end face 219a of the insulating body 203a is assigned to the feed stop 250a as a counter-stop 258.

In the embodiment according to FIGS. 38 to 41, the feed stop 250b is essentially formed by the rear end section 235b, but is angled about a bending edge 256b which is transverse or perpendicular to the longitudinal center plane 260b, so that its stop surface 257b is at least one by the inner flat side Bending leg 255b is formed. The stop 250b is located symmetrically to the longitudinal center plane 260b on both sides of the longitudinal slot 242b and is formed by two legs 255b extending laterally up to this longitudinal slot 242b and angled from the rear ends of the sleeve legs 240b, 24lb, the width of each of which is considerably smaller than that of the sleeve legs 240b, 241b is so that they are laterally set back from the narrow sides 238b and have an overall width which is only approximately as large as the corresponding width of the heddle clip 232b. The stop 250b represents the part of the entire receptacle body 228b which projects furthest over the plane of the associated flat side 237b.

FIGS. 42 to 45 show an embodiment according to the invention which can also be provided on a plug-in sleeve by itself or without the stop arrangement described. For the latching engagement in the plug opening 216 of the plug member 215, the plug part 229c between the end sections 234c, 235c at the associated intermediate section has a spring cam 261 which is provided on one of the longitudinal webs mentioned, namely preferably on one of the contact springs. In the exemplary embodiment shown, the spring cam 261 is provided on a sleeve leg 241c, specifically on a protrusion 262 protruding over its otherwise rectilinear longitudinal edge 263c, the edge of which is essentially rounded in a semicircular shape and merges into the adjacent rectilinear sections of the longitudinal edge 263c. The Spring cam 261 is embossed in a substantially circular or spherical cap shape from the projection 262 into the plug opening 259c in such a way that it lies practically in the longitudinal slot 242c, which in the area of the spring cam 261 can form a correspondingly curved slot section 265, although it is also conceivable that the projection 262 or the spring cam 261 engages under the opposite longitudinal web in the area of a corresponding shape and is thereby supported by its spring action.

The longitudinal web carrying the spring cam 261 in the exemplary embodiment shown has both the leaf spring-like effect of the contact spring 245c and the effect of a cam spring for the spring cam 261 lying between its ends and closer to the front end, which projects beyond the associated apex 249c. The spring cam 261 is located in the region of this apex 249c, but is offset from the apex 249c so that the apex line essentially affects its circumference. As a result, the spring cam 261 is located practically in the region of the insertion bevel 246c directly adjacent to the apex 249c, so that the cam axis 266 lies at a rearward opening angle of slightly less than 90 ° to the plugging direction and the front circumferential region of the spring cam 261 practically has a more increasing continuation section forms the lead-in slope 246c.

43, the plug 202 is indicated by dash-dotted lines, the plug tip 217 of which, in the inserted state, extends essentially only to the front end of the rear end section 265c and the spring cam 261 engages in the plug opening 216 thereof. On the opposite side a corresponding spring cam could be provided which, if no retraction stop 251c is provided, can be formed directly by the associated flat side.

In the embodiment of Fig. 8a, the plug 29'b similar to the embodiment of Fig. 8 has a width tapered and substantially in its plane shaft 50, the width of which can be equal to that of the tab, for example, so that the longitudinal edges of which are aligned. These longitudinal edges project between the actual flat plug and the shaft 50 on both sides in one piece with the plug piece 29'b and cams 39'b lying in its plane. The through opening formed in the housing 37'b of the insulating body 32'b as a plug-in opening for the plug-in piece 29'b is essentially adapted in cross section to the plug-in piece, its larger cross-sectional extent being closely related to the distance between the mutually facing edges of the cams 39'b is adapted that these can just be pushed through. After the plug 29'b or all plug-in pieces of the electric hotplate are pivoted out of the transport position indicated by dash-dotted lines in FIG. 8a, the insulating body 32'b can be plugged on from the plug ends of the plug-in pieces, that is to say from the outside, against the electric hotplate on the plug-in pieces. Here, the cams 39'b slide through the through openings of the housing 37'b until they reach its outer end face. Due to the resilient properties of the connecting wire 17'b, the plug 29'b then jumps into a position which is not exactly aligned with the through-opening in the housing, in which one or the other of the two cams 39'b engages behind the end face mentioned like a barb. The corresponding side edge 52 of this cam 39'b, which is associated with this end face, is designed to be undercut and inclined for the

Side edge 52 of each cam 39'b is in the associated end face of the housing 37'b immediately adjacent to the lead-through opening, a depression 51 is assigned with a correspondingly inclined bottom surface. Since the insulating body 32 'b in the mounting position radially inward relative to the electric hot plate, e.g. is supported by the gradation 42 ', if necessary under a certain pretension of the connecting wire 17'b, the striking cam 39'b is pulled transversely to the plugging direction of the plug-in piece into its securing position as a result of the interlocking inclined surfaces. Depending on the direction in which the connecting wire 17'b springs back, either one or the other cam 39'b comes into engagement with the associated recess 51. In any case, the insulating body 32'b can no longer detach itself, especially since it is usually secured by several, separately resilient plug-in pieces. The cams 39'b also form stops for the socket to be plugged onto the flat plug. The stop surface for the cam can also be recessed in the insulating body.

Claims (19)

1. Electric hotplate, characterized by electrical connections. 2. Electric hotplate according to claim 1, in which from the underside of a hotplate body (2) connection sections are led away from the hotplate body (2) fixed heating resistor connection wires (17) and the connection sections inherently rigid but resiliently projecting connection pins (19) for the connection form with connecting members of device lines (34), characterized in that the respective connecting pin (19) is provided at its end with a separate plug (29) for the connecting member which is enlarged in at least one direction compared to its other cross sections, and in that the plug (29 ) forms a pre-assembled unit with the hotplate body (2). 3. Electric hotplate according to claim 1 or 2, characterized in that at least one plug (29) of the connections is a plug, in particular by spot welding with a connecting pin (19), in particular a flat tongue which is in a common axial plane of the connecting pins (19) about a right-angled plane, that preferably the plug-in piece (29) has an in particular flat fastening section and a welding point (40) is provided in particular on a flat or side surface having an embossed cam or the like for receiving a welding point, that preferably the connecting section between an outlet on the underside of the electric hotplate and the plug (29) is angled at least once transversely to the underside, in particular at an obtuse angle, and that preferably the outer flange edge (5) of the hotplate body (2) has a flat receiving recess (27) in its annular end face for receiving the connection sections in a stacked position. 4. Electric hotplate according to one of the preceding claims, characterized in that for at least one plug-in piece (29), in particular for all plug-in pieces together, at least one insulating body (32) is provided, in particular from the free end of the plug-in piece (29) or the plug-in pieces Can be put on and / or in an at least partially fitted state as a pre-assembled component of the hotplate body (2), that preferably the insulating body (32) in at least one assembly position, in particular in an end position, via at least one securing member (39) opposite the plug-in piece (29 ) secured and the locking member (39) in particular a self-locking of the snap member or the like. and / or provided on the plug-in piece (29), in particular a snap tongue or the like which is bent out in one piece from the plug-in piece (29), is further preferably that the insulating body (32) is secured in its end position with respect to the hotplate body (2) , in particular on the outer circumference and / or on the end face of the outer flange edge (5) of the hotplate body (2) is supported with a step (42) that preferably the insulating body (32) the plug (29) and / or the connecting member on the circumference and / or at least over most of its length, and that preferably the insulating body (32) has a housing (37) and a flat extension (38) for support on the hotplate body (2), preferably for each plug-in piece (29e) a separate insulating body (32e) or a single common insulating body (32) is provided for at least two, in particular all, plug-in pieces (29). 5. Electric hotplate according to one of the preceding claims, characterized in that the connecting section with the plug-in piece (29) and / or the insulating body (32) consists of a stack layer under resilient lying essentially between the levels of the upper side and the underside of the hotplate body (2) or bending deformation of the connecting wire (17) is mounted in a connection position, and that preferably the plug (29) and / or the insulating body (32) in a stacked position essentially completely on the outside of an outer flange edge (5) of the hotplate body ( 2) and in particular at an angle to its top. 6. Electric hotplate according to one of the preceding claims, characterized in that the at least from the underside of the hotplate body (2), in particular in one piece from the heating resistor, continuous connecting portion of the connecting wire at most up to the outer circumference of the hotplate body (2d), in particular at most up to the inner circumference of the outer flange edge (5d), and that a connecting section (47) is preferably provided which connects the connecting pin (19d) to the plug-in piece (29d), in particular in one piece with the plug-in piece (29d). 7. Electric hotplate according to one of the preceding claims, characterized in that the end of at least one connecting pin (19c) is flattened and is preferably fixed exclusively with the flat side. 8. Electric hotplate, in particular according to one of the preceding claims, characterized in that the plug-in piece (29f) for securing against the connecting pin (19f) and / or with respect to the connecting member has, in particular a single, clamping screw (39f) and preferably with a plug-in hole is provided. 9. Electric hotplate, in particular according to one of the preceding claims, characterized in that at least one connecting wire is formed for the direct weld connection with a connecting element, in particular a wire end sleeve. 10. Electric hotplate, in particular according to one of the preceding claims, characterized in that it is associated with a stacking aid (101) a multi-layer stack (117), the in pallet plates (110) receptacles for the laterally outside of the associated electric hotplate arrangement of the plug pieces and / or the insulating body. 11. Electric hotplate, in particular according to one of the preceding claims, characterized in that for the electrical plug connection, in particular at least one plug-in piece, a plug-in sleeve (100) with a plug-in sleeve body (229) is provided, which has a cable connecting shaft (231) and a plug-in part (229) for the plug-in receptacle of a plug (202), such as a flat plug, preferably at least one securing element in the form of a stop (250, 251) or a locking element is provided on the plug-in sleeve body (228) and / or the plug-in sleeve body (228) essentially formed in one piece from sheet metal, in particular as a longitudinally substantially C-shaped stamped and bent part. 12. Electric hotplate according to claim 11, characterized in that the socket body (228) has at least one feed stop (250) for securing against advance against an insulating body or the like. In particular, the distance behind the front end of the plug part (229) is that In particular, at least one rearward retraction stop (251) is provided on the plug-in sleeve body (228) for securing against retraction relative to the insulating body (203) or the like, and / or the plug-in part (229) has wider flat sides (236, 237) and in particular in forms essentially flat narrow sides (238) such that the respective advance stop (250) and / or the respective return stop (251) are provided essentially exclusively in the area of the plane of at least one flat side (236 or 237), preferably the plug-in part (229) has at least one contact spring (243, 244, 245) for the plug (202), in particular on both flat sides (236, 237) in each case forms two strip-shaped contact springs on both sides of the longitudinal center plane (260), preferably on one Flat side (236) on both sides of the retraction stop (251) and / or on an opposite flat side (237) on both sides of a longitudinal slot (242). 13. Electric hotplate according to claim 11 or 12, characterized in that at least one feed stop (250a, 250b) is provided in the region of the rear end of the plug-in part (229a, 229b), in particular is formed by at least one bend, and that preferably at least one Feed stop (250b) is angled outwards from the rear end of one of two mutually directed sleeve legs (240b, 241b), two feed stops being angled in particular on both sides of a spacing gap between the sleeve legs about flush bending edges (256b) which are approximately perpendicular to the insertion direction . 14. Electric hotplate according to one of claims 11 to 13, characterized in that at least one feed stop (250a) is provided in the region of a substantially flat transition section (230a) between the cable connection shaft (231a) and the plug-in part (229a), in particular laterally one to the direction of insertion approximately parallel bending edge (256) is bent out of the transition section (230a), that preferably the counter stop (256) is provided for at least one push stop (250a) in the region of the rear end of the insulating body (203a), in particular through its rear end surface (219a ) is formed and / or that the counter-stop (222) is provided for at least one retraction stop (251) in the region of the rear end of the insulating body (203), in particular within it by a projecting shoulder, preferably at least one push-in stop (250a) is on the same side of the socket body (228a) as at least one withdrawal stop (25la). 15. Electric hotplate according to one of claims 11 to l4, characterized in that at least one feed stop (250) is provided in the region of the cable connection shaft (231), in particular through the front end face (252) one for gripping around the insulation cable jacket (226 ) certain bending clip (233) is formed, that preferably at least one advance stop (250) as an essentially rigid stop and / or at least one retract stop (251) as a stop that can be converted into a disengaging position against the spring force, in particular as an oblique, to the rear directional spring tongue (253) and / or as a snap stop which itself disengages and engages during the insertion movement, and that preferably at least one feed stop (250) on the side of the plug-in sleeve body (228) facing away from at least one withdrawal stop (251) lies. 16. Electric hotplate according to one of claims 11 to 15, characterized in that the plug-in sleeve body (228) is designed to be used essentially exclusively in a plug-in movement corresponding to its plug-in direction (arrow 224) in the insulating body (203), the counter-stop (222) preferably for the retraction stop (251) for the snap-type retraction stop (251) is formed by an inner end of a groove-like recess (221 which extends in particular to the front end surface (218) of the insulating body (203). 17. Electric hotplate according to one of claims 11 to l6, characterized in that a spring cam (261) of the plug part (229c) for engaging in a plug opening (216) of the plug (202) on the securing member or retraction stop (251c) facing away or the side of the plug-in part (229c) belonging to a longitudinal slot (242) is provided in particular on one of two mutually directed sleeve legs (240c, 241c) of the plug-in part (229c) which the associated flat side (237c) of the plug-in part ( 229c) and delimit the longitudinal slot (242) between them, and that preferably a longitudinal slot (242c) provided on one side of the plug-in part (229c) for forming a cam projection (approximately in the longitudinal center plane (260c) of the longitudinal slot (242c)) 262) for the engagement in a plug opening (216) of the plug (202) between its ends, a curved course deviating from the otherwise essentially straight course of approximately constant width The longitudinal edge (264c) of the one sleeve leg (240c) in particular protrudes in the area of the associated contact spring (244c) and the longitudinal edge te (263c) of the other sleeve leg (241c) are designed to protrude in the area of the associated contact spring (245c). 18. Electric hotplate according to one of claims 11 to 17, characterized in that the insulating body (203) for receiving the plug (202) is formed, preferably from the front end of the plug (202) approximately until it can be pushed behind it. 19. Electric hotplate according to one of the preceding claims, characterized in that at least one plug (29'b) over one or both longitudinal edges projecting stop cams (39'b) for engagement in an outer end face of an insulating body (32'b) and is arranged resiliently on a connecting wire (17'b) for the engagement position, the respective cam (39'b) preferably having an undercut, oblique side edge (52) for engagement in an associated recess (51) in the end face of the insulating body (32 'B) has.

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