DE1282767B - Electrical snap switch - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

German Kl ..

Number:
File number;
Registration date:
Display day:

HOIh

21c-28/02

21c-40/05

21C-44

P 12 82 767.7-34 (S 92875)

August 28, 1964

November 14, 1968

The invention relates to electrical snap switches with a snap spring in the form a leaf spring arm, which is attached on one side to a fixed or tiltable bracket, on free end makes contact on one of two fixed contacts (stops) by tilting the Holder or thermal deformation can be snapped into the other position with contact friction and in its central region has a spring which is subjected to a maximum tension is when the snap spring is moved to its dead center position.

The invention is based on the object, a To develop snap-action switches of the aforementioned type so that the. Current transfer respectively due to a relatively high contact pressure and avoidance of knife edge bearings at the clamping point Is designed inexpensively and also strives for a relatively narrow snap spring will. :

In the known snap-action switch of the aforementioned type (US Pat. No. 1919 327) must the snap spring has a window over a larger area for the place of a tension spring, whereby the snap spring must be made relatively wide. Also there is the kink not so pronounced in the central area of the leaf spring that a favorable contact pressure is achieved.

Another known switch (German Patent 808 600) the contact pressure is more favorable, but the overall width of the leaf spring is relatively large, and a special actuator is also necessary, which of the leaf spring body must be worn and therefore an additional effort and an additional mechanical Represents load for individual leaf spring parts.

Another known switch (German patent specification 915 955) is also a relatively wide one Construction given, and there are tilting bearings for the suspension of the leaf spring required by the present invention can be avoided.

The object on which the invention is based is achieved while avoiding the disadvantages indicated the known snap switch is primarily achieved in that the snap spring is on the clamping side and on the contact side has elongated sections, which are formed by a bend having Spring section in one piece, are connected to one another, and that a known per se, the spring section pressure-demanding bracket on the contact side on the second elongated section and Electrical snap switch

Applicant:

S. Smith & Sons (England) Limited, London

Representative:

Dipl.-Ing. E. Schubert, patent attorney,

5900 Siegen, Eiserner Str. 227

Named as inventor:

Tom Bowen, Hove, Sussex (UK)

Claimed priority:

Great Britain August 29, 1963 (34150),
dated January 22, 1964 (2704)

on the clamping side either on the first elongated section or in the vicinity of its holder is fixed.

The spring section of the snap spring can be S-shaped. Also can first and second elongate sections have cut holes in which the rigid Bracket is tiltable in a known manner.

In a time-controlled electrical switching device with a snap switch and a pivotable bracket of the snap spring according to the invention and a timer motor can Bracket have a wedge-shaped stop piece with two actuating surfaces, the motor having two different lengths, adjustable with respect to their angular position stop arms drives their stop surfaces are only assigned to a partial surface of the stop piece and so the bracket for Switching can only tip over if the bracket has previously been through the other stop arm has been tipped back.

Two snap switches according to the invention - an energy regulator with a snap switch according to the invention and a time-controlled electrical switching device with one of the switches shown - are now on hand of them for example

809 637/834

3 4

reproducing drawing described in more detail- The described switch works as a simpler

ben, namely shows on / off switch. In the case of a modified version

F i g. 1 in the side view, the stop 4 becomes a first "snap shape" by means of a switch in its first operating position, clock replaced, so that the switch is then

Fig. 2 the snap switch according to Fig. 1 in 5 acts as a switch,

its second operating position,. .,, The switch described is in both operating

3 shows a side view of an energy regulator, positions stable, and the elongated section

Fig. 4 a view in the direction of arrow IV Ic remains in contact with the contact 3 or

of Fig. 3, .-.:. ■ _ the stop until one of the above-described

5 shows a second snap action being carried out in a side view. With a modified

switch in its first operating position, embodiment is one half of the S-shaped

Fig. 6 shows the switch according to Fig. 5 in its spring section Ib stronger than the other half, beizweiten operating position, play, the upper half is twice as wide as

F i g. 7 shows a perspective view of the lower half. In this case the spring

• Part of a time-controlled electrical Schaltvörrich- ^ 15 "Teilstück'lö," if no "B" activity "~ takes place7" that

device that the portion shown in Figs. 5 and 6 Ic in contact with the stop 4. The

Has switch (with two brackets omitted, part Ic can be connected to the contact 3 in

are), while ^v "- '-"' - ^{; !} ■ be brought into contact that the spring part

Fig. 8 shows in a side view the device shown in Fig. 7 Ib or a point on the section 1a so long (with some construction 20 is moved until the sections ία and Ic over

parts are omitted for the sake of clarity). have moved out of the position in which they

The snap shown in FIGS. 1 and 2 are aligned with each other and the section Ic in contact switch has a snap spring 1 with three parts with the contact 3 is. The force that is required piece on, namely a longitudinally stretched part is to move the snap spring 1, is verminstück ία on the Emspannseite, an S-shaped as changes as soon as the'Teilstucke ία and le the position 'spring part Ib and a have passed further longitudinally in which they are aligned. If the th part lc, on the contact page. The snap spring 1 is released or released, spring 1 has a uniform width and is axial, over then the spring section Ib brings the section 1c through the length of the spring section 16 out of contact with the contact 3 and in touch holes. That end of the section-la, -which 30 tion with the stop 4. ^ ■; "facing away from the spring part Ib , is attached to a power holder 2 and a contact (not shown) controller has a snap spring 1 with the three parts. A" U-shaped bracket 5 connects a piece-like , namely the portion la (chucking point. the. portion la. a. point on each other), the S-shaped spring portion 1 b and the Teilstücklc, wherein the points from Federteil- 35 Teilstücklc (contact side). "One end of the piece Ib have the same distance. The bracket 5 snap spring 1 is in the vicinity ^{1 of} a holder 12 sits in holes in the sections la .und Ic ₅ "^{; v} attached, and the other end carries a Koh-. _(:; as indicated at 6 and 7) cut or clock 24. The metal which the. lower Äusdeheingekerbt and rests against the said spring portion has expansion coefficient; * befindet'sich; on the top Ib nearest "edges" of the holes on at 40 side of 'snap spring 1, ie. the side of which it is tiltable. The bracket 5 holds its toggle contact 24. The. Materials from which the points at a fixed distance from each other, snap spring 1 consists, are such that the snap spring 1 so that the Federteüstück 1 b is held under compressive stress by a current flow through this'. DaS'dem spring section 1 b remote is heated through so that the spring section 1 & end of the section 1 c ^ can be moved in a first operating position 45 with respect to the contact 24 '(Fig. 1) with a contact and in will. One end of a wire serving as a bracket is in a second operating position (Fig. 2) with a tes22 on the section Ic in the vicinity of the contact stop 4 with the active connection! The 24 is attached, and the 'other end is attached to a right-hand part. A spindle 9 is that the spring section! &'Or a point leads through'die holder 12, with / deräuf the portion is moved until that part of the spindle 9 that is through the holder sections Ια and "lc with each other align, when 12 is threaded through, the 'spring part Ib is exposed to a maximum compressive force with a corresponding thread in the. The part 1c is then quickly interacting with each other (indicated at "8). In through the spring part 1 & with The spindle 9 is cut away from the stop 4. in Fig. 3, so that the contact is brought. First of all, the snap spring 1 is visible Reinforced contact 3. In a similar way, the 12 attached edge engages in a section 1 from its second operating position 60 groove of the spindle 9. The spindle "^ tr ägt on the (Fi g. 2) in its first operating position (FIG. 1) because the end facing away from the holder 12 has a composite through that the spring part 1 b cam 13, the cam pronle 13 α and 13 δ, or a point on the part la. as long loading Blättfedern 25 and 26 'with the one end to be moved, are secured to the sections la and Ic to each other of the holder 12, with the stand- Nök-, are aligned. The Teilstücklc is, when combined with the 65 kenprofUen 13α or, 13 &itt; W. active connection and stop 4 is in operative connection, at a distance are pretensioned so that they make contact with them - from contact 3, so that a spark over- hold. The leaf springs 25 and; 26 carry a con- _: jump is unlikely.; ■ bar 23 or a stop i4, which are so arranged

are that the contact 24 can come into operative connection with them. The snap spring 1 is shaped so that, when it is cold, the contact 24 is in operative connection with the contact 23. The cam profiles 13 a and 13 b are shaped so that when the spindle 9 is moved to the right, the leaf springs 25 and 26 are moved away from the spindle 9, the contact 23 being moved twice with respect to the stop 14.

The leaf spring arm 25 and the snap spring 1 are connected to connections 10 and 11, respectively, and these even to the Bracket 12 attached.

. The mode of operation of the energy regulator will now be described. The terminals 10 and 11 are connected in series with an electrical heating element, e.g. B. the element of a heating ring of an electric cooker, and are connected to the AC power supply. An electric current then flows through the snap spring 1, the leaf spring 25 and the heating element. The temperature of the snap spring 1 rises as a result of the heating effect of the electric current flowing through it. By the temperature increase is effected in that the snap spring 1 is moved over the center position, that is, the spring portion Ib is moved upward until the sections la and Ic precisely the position have passed, in which they are aligned, and the spring portion 1 b of the The greatest compressive force is then exposed when the contact 24 is moved quickly into operative connection with the stop 14. The current flowing through the snap spring 1 is removed and the temperature of the snap spring drops. As soon as the temperature falls, the spring section 1 & is moved downwards until the snap spring 1 again goes beyond the middle position, and the contact 24 is quickly brought back into operative connection with the contact 23.

The ratio of the time during which the contact 24 cooperates with the contact 23 and current flows through the snap spring 1 and the leaf spring arm 25 at the time in which the Contact 24 is in operative connection with the stop 14, can be changed by turning the spindle 9 will. By moving the spindle 9 to the right, whereby the tension in the wire 22 is increased and the leaf spring arms 25 and 26 are moved away from the spindle 9, the period of time during whose contact 24 is in contact with contact 23, elongated.

According to FIGS. 5 and 6, the snap spring 1 is fastened with the section 1 a over the greater part of its length to a molded plastic holder 113 which can be pivoted to a limited extent at 108 in the plane of the contacts. In Fig. 5, the holder 113 is in one and in F i g. 6 in the other extreme angular position. As shown in FIG. 1, the bracket 5 is connected to the snap spring (via notches 115 and 116). That arm of the bracket 5 which passes through the hole in the section 1 α is accommodated in a recess 114 of the holder 113. The end of the section Ic remote from the spring section Ib carries a contact 104 on the underside. In the angular position of the holder 113, as shown in FIG. 5, the section Ic is in its first operative position and the contact 104 is in contact with a contact 105 mounted on a block 106. In the case of the in FIG. 6 is the angular position of the holder 113 shown, the section Ic is in its second operating position, and its end is in contact with a block 107. The section Ic can from the in Fi g. 5 into the position shown in FIG. 6 illustrated are brought characterized in that the holder 113 is rotated in a clockwise direction until the catch spring 1 exceeds the central position, that is, until the sections la and Ic just that position have passed, in which they are aligned when the spring portion 1 b of a maximum pressing force is exposed. The section Ic is then quickly moved into the position in which its end contacts the block 107. During the period in which the holder 113 is rotated, the contact pressure between the contacts 104 and 105 is increased (ie, the electrical resistance is decreased) until just before the contacts separate. Similarly, the section 1 can c from the in Fig. 6 in the position shown illustrated in FIG. 5 are brought characterized in that the holder 113 is rotated in Gegenuhizeigersinn until the snap spring 1 goes beyond the middle position.

The in the F i g. 5 and 6 shown 'switch is in both operating positions of the elongated Part Ic stable. If desired, however, the angle through which the bracket 113 is counterclockwise must be rotated (with the section Ic initially in its second operative position [i.e. that shown in FIG Position]), in order to align the sections la, Ic, can be made larger than the angle by which the bracket 113 must be rotated clockwise (with the portion Ic initially in its first operating position is [d. H. in the position shown in Fig. 5]) to the sections la and Ic to align, this can be done, for example, by the positions of the Blocks 106 and 107 are set accordingly.

The time switch shown in FIGS. 7 and 8 has two snap-action switches which correspond to the one the in the F i g. 5 and 6 is shown. A perspective view of the snap springs 1, which are attached to the bracket 113 is shown in FIG. 7 shown. In this view, the brackets 5 have been omitted and the snap springs 1 are located in a position that they assume when the temples are removed, d. i.e., the sections la and 1 c align with each other. Slots 110 are machined into the bracket 113 in which arms are attached which limit the movement of the bracket 113. The snap springs 1 are together attached with connection plate 111 to the holder 113 by rivets 112. The platelets 111 serve to connect the snap springs 1 to the circuit to be controlled by the timer. F i g. 8 shows one of the snap springs 1 and also a wedge-shaped stop piece 118 (also in FIG 7 visible), which consists of one piece with the holder 113. The timer has a Shaft 123, which is driven by a synchronous electric motor via a gear (not shown) will. The shaft 123 carries two stop arms 121 and 122, which are labeled "AUS" and "EIN" are and each have stop surfaces 119 and 120, respectively. The stop surface 119 works with the upper left flank of the stop piece 118

together when the section lc is in its first operating position (fully marked in FIG. 8) to rotate the holder 113 clockwise so that the section Ic is quickly moved into its second operating position (shown in dashed lines) .

Similarly, when the section Ic is in its second operating position, the stop surface 120 cooperates with the lower left flank of the stopper 118 to rotate the bracket 113 counterclockwise so that the section Ic is quickly moved to its first operating position.

In operation, the shaft 123 makes one revolution clockwise every 24 hours. By the stop surface 119 of the contact 104 is brought out of operative connection with the contactless, so that the switch is turned off in this manner, and the contact is subsequently brought 105 again with the contact 104 in operative connection so that by the stop surface 120th the switch is turned on. The angular positions of the stop arms 121 and 122 are adjustable so that the switch-on and switch-off times can be adjusted.

In a modified embodiment, the arms that sit in the slots HO are part of a single component which is provided with a stake inserted into a slot. The stake cooperates with the slot to limit the angular movement of the bracket 113. The component can be provided with a protruding arm that can be operated by hand. For example, when the section Ic is in its first operating position, the arm can be actuated to bring it into its second operating position. The stop surface 119 is then not in operative connection with the stop piece 118 at the given time, but the portion Ic is returned to its first operating position by the stop surface 120 when it comes into operative connection with the stop piece 118 at the given time. When the arm is actuated to bring the section Ic into its first operating position, the stop surface 120 is likewise not operatively connected to the stop piece 118 at the specified time, but the stop surface 119 brings the section Ic in at the specified time the second operating position.

Claims (5)

Patent claims: 1.Electric snap switch with a snap spring in the form of a leaf spring arm, which is fastened on one side to a stationary or tiltable holder, at the free end makes contact with one of two Pest contacts (stops), by tilting the holder or thermal deformation with contact friction in the respective, other position can be snapped and in its central area one. Has spring which is subjected to a maximum tension when the snap spring is moved into its dead center position, characterized in that the snap spring (1) has elongated portions (la and Ic) on the clamping side and on the contact side, which are made in one piece by a spring portion (Ib) with bends are connected to one another, and that a per se known, the spring section (Ib) stressing bracket (5, 22) on the contact side on the second elongated section (Ic), and on the clamping side either on the first elongated section (la) or in the vicinity of it Bracket (12, 113) is set. 2. Snap switch according to claim 1, characterized in that the spring section, (1 &) Is S-shaped. 3. Snap switch according to claim 1 or 2, "characterized in that the first and second elongated sections (la, Ic) are incised Have holes in which the stiff bracket (5) is tiltably mounted in a known manner. 4. Time-controlled electrical switching device with a snap switch and a pivotable holder of the snap spring according to claim 1 to 3 and a timer motor, characterized in that the holder (113) has a wedge-shaped stop piece (118) with two loading ^ has actuation surfaces and that the motor (123) drives two stop arms (121, 122) of different lengths, adjustable with regard to their angular position , whose stop surfaces (119, 120) are each assigned to only one partial surface of the stop piece (118) and thus the holder (113) can only tip over to switch if the bracket has previously been tilted back by the other stop arm. 5. Time-controlled electrical switching device • according to claim 4, characterized) that the holder (113 ) carries two snap springs (1). Considered publications: German patent specifications No. 587 051, .808 600,
814760, 915 955; Austrian Patent No. 221157; Swiss Patent No. 266 748; British Patent No. 715,489; U.S. Patents Nos. 1919 327, 1960 020,
398; 2 068 374, 2.417652, 2486033. 1 sheet of drawings 809 637/834 11.68 © Bundesdruckerei Berlin