EP2656990B1 - Slate cutters - Google Patents

Description

The invention relates to a breaking device according to the preamble of claim 1.

A generic breaking device is of the DE 86 14 928 described. It is a slate scissors, which has two crossed pivotally attached together lever. The two elongated levers each form a handle arm and a Brecharm. If the two gripping arms are pivoted toward one another, then a cutting edge formed by a crushing arm approaches a bearing surface formed by the other crushing arm. If a workpiece, for example a slate plate, rests on the bearing surface, then the cutting edge penetrates into the surface of the slate plate in order to break or split it. In the prior art, the two gripping arms are elongated and each have at their two ends a grip zone. One of the two grip zones lies in the hollow hand of the user. The other grip zone is encompassed by the four fingers in opposition to the thumb. The lever located in the hand cavity forms the support surface, which faces upwards in the intended position of the tool, so that a workpiece can be placed on the support surface lying in the horizontal plane, which can be cut with the cutting edge, which is then visible.

A similar tool describes the DE 804 168 ,

In the prior art also special tools for other purposes are known, the Z-shaped lever arms have, for example, shows the DE 70 08 369 U1 a poultry shears

The EP 0048665 shows a slate shear with two handle arms, in which only the support surface forming the handle arm is rigid. The other arm is operatively connected to the cutting edge to form a reduction gear.

The US 2,575,630 shows a slate shear with rectilinear gripping arms.

The US 2004/0182380 A1 describes a bolt cutter with a reduction gear.

A slate scissors with rectilinear grip arms also describe the De 7514381 and DE29709400 U1 ,

The invention has for its object to improve the handling of the generic tool.

The object is achieved by the invention specified in the claims. According to the invention, the angle between the support line and the handle line has an upper limit which is smaller than the angle have the support line to handle line in a known breaking tool. The angle refers to the cross-sectional plane parallel to a broadside plane. By this is meant the plane to which the pivot axis is perpendicular. In this plane, the angle between the support line and the handle line is selected such that the user can operate the breaker in a relaxed posture with both the horizontal upwards and the downwards oriented support surface even at chest height. The relevant angle should be less than 20 ° according to the invention.

It is advantageous if, in a breaking device, the support surface is formed by a flat piece which has a back surface parallel to the support surface. The flat piece may have on its side facing away from the pivot axis side a terminal edge and / or a mark. The end edge or the mark are both in the direction of the back surface visible. In such an embodiment of the breaking device, the cut to be made with the breaking device can be made along a marking. The handle arms can be held by the user both above the workpiece and below the workpiece. The marker indicates to the user in which direction the cutting edge enters the workpiece from the opposite side. The angle between the support line and the handle line is less than 20 °. Preferably, the angle is less than 15 °. Handle line and support line can run parallel to each other. The intersection of the two lines is preferably in the cutting direction in front of the crusher arms. But it can also lie in the cutting direction of the rear handle arms. Both gripping zones are preferably arched in directions pointing away from each other, so that they can each comfortably lie in the hollow of the user's hand or can be encompassed by the fingers of the hand. In one mode, the cutting edge points downwards. The visible side of the slate to be broken is then below the support surface, so that the cutting edge penetrates from below into the workpiece. In the alternative mode of use, the cutting edge having crushing arm up. In this mode, the cutting edge penetrates during operation in the visible side of the slate to be machined, which rests with its back on the support surface. The bearing surface forms a plane. According to the invention, the gripping arm, which is rigidly connected to the support surface, lies approximately in a plane parallel to the support surface. The distance between these two imaginary planes is sufficiently large, so that the other gripping arm lies in the distance space between the two planes, so that the two gripping arms can be conveniently gripped by the user's hand. The slate to be cut then lies in a plane that is spaced from the user's hand. The angle of attack of the user's arm is substantially the same, regardless of whether, during actuation, the gripping arm has the support surface or the gripping arm having the cutting edge facing upwards. The qualitatively equivalent use of the device with both downwards and upwards Support surface is further favored that the support surface is formed by a portion of a punched / bent part, which has a parallel to the cutting edge extending slot. This slot is visible from both sides of the sheet metal section, so that the breaking line in the first orientation is visible on the basis of the course of the cutting edge and in the second, rotated by 180 ° orientation of the device based on the course of the slot.

In a preferred embodiment of the invention, the two gripping arms are in the closed position substantially parallel to each other. Parallel to each other in the sense of the invention means that even a small angle between the two parallels can exist. The two levers have a Z-shape. The two Z-legs are each formed by the handle arm and the crushing arm. The Z-bridge runs between the handle arm and the crushing arm. He runs preferably obliquely. The Z-bar defines a bridge line that runs at an acute angle to the support line. The angle between the web line and the support line is greater than the angle of at least one of the two handle lines to the support line. The angle of the bridge line to the support line is preferably a maximum of 45 °. Preferably, the angle is in the range between 25 ° and 35 °. The length of the Z-bar is dimensioned such that the grip zone indicative of the support line has a sufficient distance to the support line, so that the user's fingers have space in the distance space. One or both of the grip zones can form support shoulders. Preferably, the lever carrying the bearing surface has a pronounced support shoulder which is arranged between the bearing section and the grip zone. Also, the blade carrying the blade may have such a support shoulder. On the support shoulder, the user's hand can be supported, if he wants to exert pressure on the tool in the cutting direction. The marking mentioned above may be formed by a notch, which is located in the front edge of the sheet metal made of sheet metal. In the area of the two in the closed position parallel to each other Z webs may be provided a compression spring arrangement which acts on the two handle arms in the open position and which is tensioned when closing the device. The pivot bearing can be arranged in the transition region of the Z-web to the Brecharm. The two gripping arms can be formed by die-cast parts. Preferably, it is metal die-cast moldings. The die-cast moldings preferably form both the handle arm-side Z-legs, as well as the Z-webs. The cutting edge may be formed by a blade inserted in a slot of the handle arm. The support surface is preferably formed by a sheet metal part. It is a stamped and bent part, which can have a U-shape. In the space between the two U-legs of the Brecharm recording. The U-bar forms the support surface. He has a slot through which the cutting edge having blade protrudes.

In one embodiment of the invention, which has an independent meaning, it is provided that one of the two gripping arms has a slot, into which a slate can be inserted. The insertion slot has two substantially mutually parallel slot walls and an orifice. At the opposite end of the mouth of the insertion slot has a bottom. In the area of the mouth a pin is provided. It is a sharpened steel pin that crosses the insertion slot when closing the device to punch a hole in the slate. According to the invention a stop element is provided, which is arranged between the pin and the bottom and whose distance from the pin can be varied. The stop element may consist of several parts and can be fixed in mutually different distances from the pin in the insertion slot. For this purpose, a captive element is provided, which is preferably formed by a threaded element. It can be a threaded shaft having a knurled head and screwed into an internal thread of one of the stop elements is. By turning the threaded element, the stop element can be brought from a bondage position into a released position in which the distance is adjustable.

The above-mentioned spring, which pushes the two levers apart, preferably sits in a chamber. Another aspect of the invention relates to the design of this chamber. It has a cleaning port through which, for example, compressed air can be blown into the chamber to remove dust or the like from the chamber. In a preferred embodiment of the invention, two opposite cleaning openings are provided. The cleaning openings may be assigned to the above-mentioned U-shaped punched / bent part. The chamber walls are formed in this embodiment of the two U-walls of the punched / bent part. The two U-walls form opposite cleaning windows. When assembled, the spring lies between the two cleaning holes. In a preferred embodiment, the spring is supported on one side on the lever and on the other side on a head of a plunger, which can also form the pin. The head of the plunger may be rounded and slidably mounted in a bearing recess of the other lever. In the closed position, two abutment surfaces of the levers, which are in particular formed by the Z webs, come against one another. The pivot axis about which the two levers are pivotable, crossing the gap between the two U-walls of the stamped and bent part immediately rearward of the support surface. The blade, which forms the cutting edge, is crossed by the pivot axis and extends through a longitudinal slot arranged in the support surface. This longitudinal slot is visible by the craftsman in both processing positions. In the machining position, with the blade pointing upwards, the craftsman looks at the support surface. In the machining position, with the blade facing downwards, the craftsman looks into the space between the two walls of the stamped / bent part. The support surface forming the crushing arm is according to the invention thus formed exclusively by the U-shaped plate which extends parallel to the blade. The rearward of the longitudinal slot extending space between the two U-walls thus forms a free space. The U-shaped punched / bent part supports the two Z-leg sections of the handle arms. The two gripping arms can have a substantially equal material thickness. One of the two handle arms is firmly bolted to the U-plate. The other of the two handle arms is pivotally associated with the sheet metal part.

Fig. 1

eine Schieferschere eines ersten Ausführungsbeispiels in der Offenstellung in einer ersten Betriebsart, in der die Klinge nach oben weist,

Fig. 2

eine Darstellung ähnlich Fig. 1, jedoch im geschlossenen Zustand,

Fig. 3

eine zweite perspektivische Darstellung der Schieferschere in einer zweiten Betriebsart, in der die Klinge nach unten ragt,

Fig. 4

eine Draufsicht auf eine Schmalseite der Schieferschere,

Fig. 5

den Schnitt der Linie V-V in Fig. 4 in der Geschlossenstellung,

Fig. 6

den Schnitt gemäß Fig. 5 in der Offenstellung,

Fig. 7

eine Explosionsdarstellung der Schieferschere,

Fig. 8

eine Breitseitenansicht eines zweiten Ausführungsbeispiels der Erfindung und

Fig. 9

eine perspektivische Darstellung des zweiten Ausführungsbeispiels.

Embodiments of the invention are explained below with reference to accompanying drawings. Show it:

Fig. 1

a slate shear of a first embodiment in the open position in a first mode in which the blade faces upwards,

Fig. 2

a representation similar Fig. 1 , but when closed,

Fig. 3

a second perspective view of the slate shear in a second mode in which the blade protrudes down,

Fig. 4

a plan view of a narrow side of the slate shear,

Fig. 5

the section of the line VV in Fig. 4 in the closed position,

Fig. 6

the cut according to Fig. 5 in the open position,

Fig. 7

an exploded view of the slate shear,

Fig. 8

a broad side view of a second embodiment of the invention and

Fig. 9

a perspective view of the second embodiment.

The slate scissors consists essentially of two levers 1, 2, which are rigid, multi-part body. The two levers 1, 2 are connected to each other by means of a bearing shaft which passes through bearing bores 15, 33 and 36.

The first lever 1 has a handle made of a metal die-casting 3, which has a handle end, which is structured outside haptic. The handle end opposite the end of the handle arm 3 has a slot 32 into which a bearing portion 7 of a crimp arm 5 forming blade is inserted. The blade 5 is firmly connected to the slot 32 having portion of the handle 3 by means of screws. The blade 5 has a cutting edge 10, which consists of butt-angle abutting portions 10 ', 10 "The cutting edge 10 extends substantially parallel to the extension direction of the handle arm 3. The lever 1 thus has a Z-shape, wherein the Z-web 'is formed by an intermediate portion between the pivot bearing 9 and the handle end.

The second arm 2 also has a handle made of a die-cast metal 4. This handle arm has a handle portion which in the closed state of the tool ( Fig. 5 ) extends substantially parallel to the handle portion of the handle arm 3. The handle arm 4 is firmly bolted to a U-shaped punched / bent part 12. In the assembled state and this lever 2 has a Z-shape, again with the Z-bridge 2 "of a section is formed of the die-cast part, which is located between the Schenklager 9 and handle portion.

The U-shaped sheet metal part 12 forms a bearing surface 11. This has a longitudinal slot 13. The bearing surface 11 is formed by the outer side of the U-web portion of the sheet metal part 12. The sheet metal part 12 forms a crushing arm 6. It has obliquely opposite the support surface 11 projecting U-walls 12 ', the aligned windows 14 form. The U-walls 12 'are firmly bolted to the Z-web portion of the handle arm 4. The handle arm 4 does not extend over the slot 13, so that the view in the U-space above the slot 13 is free. It thus forms a U-shaped viewing space back of the support surface 11. The bottom of the viewing clearance forms a rear side surface 11 ', which runs parallel to the support surface 11. The free end of the support surface 11 and the rear side surface 11 'forming flat piece form a peripheral edge 38. In this peripheral edge is a notch, which forms a mark 37. The mark 37 lies in the extension of the slot 13.

Parallel to the Z-web of the handle arm 4 extends an arm 27 and forms a Einsteckschlitz 16 with mutually parallel slot walls 16 '. The insertion slot 16 has a mouth 17 and a bottom 16 "opposite the mouth 17. The slot width is large enough so that a slate plate can be inserted into the insertion slot 16. In the area of the mouth 17, two mutually aligned openings 25, 26 are provided. which store a hole pin 18. It is a molded steel pin which, when the levers 1, 2 are closed, crosses the slot 16 to punch a hole in a slate plate inserted in the slot.

The pin 18 is formed by the end of a plunger 21. The plunger supports in a guide opening 24 and has a plunger head 21 '. The face the plunger head 21 'is rounded and lies in a bearing recess 23 of the handle arm 3 a. The storage trough 23 opposite portion of the handle arm 4 also has a trough, so that a chamber is formed. Two other chamber walls are formed by the inner walls of the U-legs 12 'of the housing element, which forms the sheet metal part 12. In this chamber, a compression spring 24 is mounted, which is supported with its one end on the plunger head 21 'and with its other end on the handle 4 so as to open the two levers 1, 2 in their open position (FIG. Fig. 6 ).

In the assembled state, the blade forming the breaking arm 5 projects through the slot 13 formed by the housing plate 12. The section of the handle arm 3 designated by the reference numeral 1 'is displaceably guided within the intermediate space between the two walls 12'. In the closed position ( Fig. 5 ) occur two stop surfaces 28, 28 'of the handle arms 3, 4 against each other. The two stop surfaces 28, 28 'are located between the walls 12' of the housing plate 12th

In the closed position ( Fig. 5 ), the two gripping arms 3, 4 extend in the region of the hand gripping zone substantially parallel to one another. Due to the curvature of the outline contour of the handle arms 3, 4 are not parallels in the mathematical sense. In the Fig. 5 are marked with the letters A, B, C three straight lines, which lie in a cross-sectional plane. The paper plane defines a cross-sectional plane parallel to the broad side plane, in which the three lines A, B, C lie. The line A is defined by the support surface 11. This support line A extends through the plane of the support surface 11. The line B is defined by the grip zone 4 'of the lever 2, which also carries the support surface 11. The handle line B defines the angular position of the grip zone 4 'relative to the support surface 11. The handle line B thus corresponds to the averaged direction course of the area of the grip zone 4' encompassed by the hand of the user.

The Line C is also a handle line. It corresponds to the middle direction of the grip zone 3 '. The angles between the straight lines A, B, C are less than 20 °. In particular, the angles A, B and A, C are less than 20 °.

By means of a closure element 30, the two levers 1, 2 are held in the closed position. It is a arranged at the end of a wire ball, which rests in the closed position in a ball socket of the other lever. However, the closure element can also be a closure clip, which is arranged at one of the ends of the levers 2, 3.

In the closed position ( Fig. 5 ) also run the cutting edge 10, at least the designated by the reference numeral 10 "portion and the support surface 11 substantially parallel to each other.

Is the tool opened ( Fig. 6 ), the handle arms 3, 4 extend at an acute angle to each other. The cutting edge 10, or its portion 10 'and the support surface 11 then extend at an acute angle to each other. The section 10 'of the cutting edge 10 extends in the open position, however, parallel to the support surface 11. It is the section of the cutting edge 10, which is the hinge axis 9 closest.

At the rear of the cutting edge 10 is a stop 31, which rests in the open position on the support surface 11.

Between the bottom 16 "and the mouth 17 of the insertion slot 16 there is a stop element 19, which consists of two stop elements, which are connected to each other by means of a screw 20. The screw 20 has a knurled screw head 20 'The edge of the insertion slot 16 has various locking recesses 29 for capturing the stop elements 19 in predetermined positions. For this purpose, the stop elements 19 are tied together by means of the screw 20. If the screw 20 is released, the stop element 19 can be displaced. The depth of the insertion slot 16 can thus be adjusted.

From the FIGS. 1 and 3 It can be seen that the slot 13, which extends parallel to the cutting edge 10 within the support surface 11, both from the outside of the housing 12, and from the inside of the housing 12 can be seen. The support surface 11 is formed by a freely parallel to the cutting edge 10 extending U-structure.

The U-shaped sheet metal part 12 has a web portion which forms the slot 13. This web portion is formed as a flat piece. The flat piece runs freely in the end of the Brecharmes 6. The front end edge of the crushing arm 6 is thus formed by the end face of the flat piece, which forms on its side facing the cutting edge 5, the support surface 11 and on its side facing away from a rear side surface 11 '. The front side of the flat piece forms a terminal edge 38 which is visible both with respect to the support surface 11 and with respect to the rear side surface 11 '. In the end edge 38 is a mark 37 which is formed as a notch, and marks the cutting direction.

That in the FIGS. 8 and 9 The second embodiment shown differs from the first embodiment essentially only by the design of the handle arms 3, 4. The handle lines B, C run here at a slightly larger angle to the support line A. Again, the angle of the handle lines B, C to the support line A is at Values below 20 °. The gripping lines B, C intersect the support line A in front of the crusher arms 5, 6. The web between the gripping zones 3 'and 4' and the crushing arm 5, 6 defines a web line E, which has an angle of about 30 ° to the support line A.

In the in the FIGS. 8 and 9 illustrated embodiment is located between the web and the grip zone 4 'a support shoulder 39. The support shoulder 39 goes out as a rounding of the grip zone 4'. At this support shoulder 39, the user's hand can be supported to exert a pressure in the cutting direction on the tool.

The grip zone 3 'has such a support shoulder 40. Also on this support shoulder 40, the user's hand can attack to exert a pressure in the cutting direction on the tool. This support shoulder 40 is formed by a rounded end portion of the grip zone 3 '. The closure member 30 is formed in the second embodiment as a rectangular pivoting eye which is fixed to the handle arm 4 and which can be pivoted about the handle arm 3 to hold the tool in the closed position. <B> LIST OF REFERENCES </ b> 1 lever 1' Z-web 22 feather 2 lever 2 ' Z-web 23 bearing recess 3 Handle arm, handle 24 Opening / management 3 ' grip 4 handle arm 25 opening 4 ' grip 5 Breaker arm / blade 26 opening 6 breaker arm 27 poor 7 bearing section 28 stop surface 28 'stop surface 8th bearing section 29 9 pivot bearing 30 closure element 10 cutting edge 10 ' section 31 attack 10 " section 11 bearing surface 32 slot 11 ' Rear face 12 Punching / bending part / sheet metal part / / housing 33 bearing bore 12 ' U-wall 13 Longitudinal slit / slot 34 fastening opening 14 window 35 fastening opening 15 bearing bore 36 bearing bore 16 insertion slot 37 mark 16 ' wall 38 terminal edge 16 " ground 39 supporting shoulder 40 supporting shoulder 17 muzzle A support line 18 pin hole B Direction line 19 stop element C Direction line 20 screw 20 ' screw head e ridge line 21 tappet 21 ' ram head

Claims (13)

1. Breaking device for slab-shaped workpieces, such as slates, cement slabs or the like, comprising two rigid levers (1, 2) which each comprise a grip arm (3, 4), a breaking arm (5, 6) and a bearing portion (7, 8) therebetween, the two levers (1, 2) being interconnected so as to be pivotable about a pivot axis (9) such that, when the device is closed from an open position into a closed position by pivoting the two grip arms (3, 4) towards one another, a cutting edge (10) formed by one breaking arm (5) moves towards a contact face (11) formed by the other breaking arm (6), a grip region (4') of the lever (2) which forms the contact face (11) defining a first grip line (B) which extends in the extension direction of its associated grip arm (4) and is located in a cross-sectional plane of the device, which plane perpendicularly intersects the pivot axis (9), the grip region (3') of the lever (1) which forms the cutting edge (10) defining a second grip line (C) which extends in the extension direction of its associated grip arm (3), and the contact face (11) defining a contact line (A) located in the cross-sectional plane of the device, the two grip arms (3, 4) being able to be gripped by a hand, characterised in that a first angle between the contact line (A) and each of the two grip lines (C, B) is smaller than 20°, the two levers (1, 2) each having a Z shape, the Z connecting portion forming a connecting portion line (E) which is at a second angle to the contact line (A) which is greater than the first angle.
2. Breaking device according to claim 1, the contact face (11) being formed by a flat piece having a rear face (11') extending in parallel with the contact face (11), characterised in that the flat piece has, on its side facing away from the pivot axis (9), a free end edge (38) and/or a marking (37) which can be seen both when looking at the contact face (11) and when looking at the rear face (11').
3. Breaking device according to any of the preceding claims, characterised in that each of the two grip arms (3, 4) has a grip region (3', 4') and these define grip lines (A, B) which each extend in the extension direction of the grip arm (3), are located in a cross-sectional plane of the device and extend approximately in parallel with each other when in the closed position.
4. Breaking device according to any of the preceding claims, characterised in that the angle between at least one grip line (B) and the contact line (A) is at most 20°, preferably at most 15°.
5. Breaking device according to any of the preceding claims, characterised in that one of the two grip regions (3', 4'), preferably the grip region (4') assigned to the lever (2) which forms the contact face (11), transitions into a support shoulder (39) which is arranged between the grip region (4') and the bearing portion (8) and on which the hand of the user can be supported.
6. Breaking device according to claim 1, characterised in that the angle between the connecting part line (E) and the contact line (A) is between 25° and 35°.
7. Breaking device according to any of the preceding claims, characterised in that the two grip arms (3, 4) are formed from diecast parts and/or in that the contact face (11) is formed from a sheet metal part (22), in particular a punched or bent part, which is in particular U-shaped.
8. Breaking device according to any of the preceding claims, comprising an insertion slot (16) which has an opening (17), two opposing walls (16') and a bottom (16") and is crossed by a plain core pin (18), which is adjacent to the opening (17), when the levers (1, 2) close, characterised by a stop element (19) which is arranged between the plain core pin (18) and bottom (16") and the distance of which from the plain core pin (18) is adjustable.
9. Breaking device according to claim 8, characterised in that the stop element (19) can be moved from a retained position into a released position, in which the distance can be varied, by operating a threaded element (20).
10. Breaking device according to any of the preceding claims, the two levers (1, 2) being acted upon, when in the open position, by a spring (22) arranged in a chamber, characterised in that the chamber has a cleaning aperture (14), in particular for cleaning using compressed air.
11. Breaking device according to claim 10, characterised in that the chamber (2) has opposing cleaning apertures (14) which are each assigned to one of the two sides of the breaking device, the spring (22) being located between the two cleaning apertures (14).
12. Breaking device according to either of the preceding claims 10 or 11, characterised in that the chamber comprises chamber walls (12') which are formed from a sheet metal part (12) which in particular also forms the contact face (11).
13. Breaking device according to any of the preceding claims, characterised by an elongate hole (13) which is arranged in the contact face (11) and is penetrated by a blade forming the cutting edge (10), and/or which is visible from either side of a portion, forming the contact face (11), of a punched/bent part (12), and/or in that the portion, which forms the contact face (11), of a punched/bent part (12) forms side walls, which are in particular provided with windows, and/or has a U-shaped cross section.

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