EP2656990A1 - Slate cutters - Google Patents

Abstract

The breaking device has the bearing portions (8) that are connected together by a pivot axis (9). The cutting edge breaker arms (5,10) are formed in a bearing surface (11). The two handle arms (3,4) of a lever (2) are swung towards each other when the bearing portions is moved from open position to closed position, such the cutting edge breaker arms are set on a breaking arm (6). The plane of handle arm (4) is set beyond the pivot axis and in parallel to the plane of bearing surface, so that the device is operated both upwardly and downwardly with the bearing surface.

Description

The invention relates to a crushing device for plate-shaped workpieces, such as slates, cement boards, in particular fiber cement boards or the like, with two levers, each having a handle arm, a Brecharm, and an intermediate bearing portion, where the two levers are pivotally connected to each other about a pivot axis, in that when closing the device from an open position to a closed position by pivoting the two gripping arms together, a cutting edge formed by a crushing arm moves against a support surface formed by the other crushing arm, wherein a gripping zone of the lever forming the support surface extends in an extension direction of the gripping arm Defines the cross-sectional plane of the device lying handle line and the support surface defines a lying in the broad side plane of the device support line.

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 points in the intended position of the tool upwards, so that on the lying in the horizontal plane bearing surface is a workpiece can be placed, 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 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 30 ° according to the invention.

Alternatively or in combination with it is further proposed that in a crushing device, wherein the bearing surface is formed by a flat piece having a parallel to the support surface back surface, the flat piece on its side facing away from the pivot axis side has a terminal edge and / or a mark. The end edge or the marking are both in the direction of the support surface as well as in the direction of view 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 preferably 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 room 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 arm 4 so as to move the two levers 1, 2 in their open position ( 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 user's hand.

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 shown second embodiment 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.

All disclosed features are essential to the invention. The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application. The subclaims characterize in their optionally sibling version independent inventive developments of the prior art, in particular to make on the basis of these claims divisional applications.

LIST OF REFERENCE NUMBERS

1 lever 1' Z-web 22 feather 2 lever 2 ' Z-web 23 bearing recess 3 Handle arm, handle 3 ' grip 24 Opening / management 4 handle arm 4 ' grip 25 opening 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 Punched / bent part / sheet metal part / 33 bearing bore /Casing 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 (15)

Crusher for plate-shaped workpieces, such as slates, cement slabs or the like, with two levers (1, 2), each having a handle arm (3, 4), a crushing arm (5, 6), and an intermediate bearing portion (7, 8) where the two levers (1, 2) are pivotally connected to one another about a pivot axis (9) such that one of a breaker arm (5, 5) pivots from an open to a closed position by pivoting the two handle arms (3, 4) together ) formed cutting edge (10) against a of the other Brecharm (6) formed support surface (11) moves, wherein a grip zone (3 ') of the support surface (11) forming the lever (2) extending in the extension direction of the gripping arm (3), defined in a cross-sectional plane through the pivot axis (9) of the device handle line (B) and defines the support surface (11) lying in the cross-sectional plane of the device support line (A), characterized in that ss the angle between support line (A) and handle line (B) is less than 30 °. Crusher for plate-shaped workpieces, such as slates, cement slabs or the like, with two levers (1, 2), each having a handle arm (3, 4), a crushing arm (5, 6), and an intermediate bearing portion (7, 8) where the two levers (1, 2) are pivotally connected to one another about a pivot axis (9) such that one of a breaker arm (5, 5) pivots from an open to a closed position by pivoting the two handle arms (3, 4) together ) formed cutting edge (10) against a by the other Brecharm (6) formed bearing surface (11) moves, wherein the support surface (11) by a to the support surface (11) parallel extending rear side surface (11 ') having flat piece is formed, characterized . that the flat piece on its side remote from the pivot axis (9) having a free end edge (38) and / or a mark (37) both in the direction towards the bearing surface (11) and in the viewing direction on the rear surface (11 ') is visible. Crushing device according to one or more of the preceding claims or in particular according thereto, characterized in that each of the two gripping arms (3, 4) has a gripping zone (3 ', 4') extending in the direction of extension of the gripping arm (3) in a cross-sectional plane define the device lying handle lines (A, B), which extend in the closed position approximately parallel to each other. Crushing device according to one or more of the preceding claims or in particular according thereto, characterized in that the angle between at least one handle line (B) and the support line (A) is a maximum of 20 °, preferably a maximum of 15 °. Crushing device according to one or more of the preceding claims or in particular according thereto, characterized in that one of the two gripping zones (3 ', 4'), preferably the gripping zone (4 ') associated with the lever (2) forming the support surface (11), is inserted between Grip zone (4 ') and bearing section (8) arranged supporting shoulder (39) passes, on which the user's hand can be supported. Crushing device according to one or more of the preceding claims or in particular according thereto, characterized in that the two levers (1, 2), but at least of the support surface (11) forming the lever (4) has a Z-shape, wherein the Z-web ( 1 ', 2') in particular obliquely between the crushing arm (5, 6) and the handle arm (3, 4). Crushing device according to one or more of the preceding claims or in particular according thereto, characterized in that the Z-web (1 ', 2') defines a web line (E) which has an angle of less than 45 ° to the support line (A), but larger is as the angle of one of the handle line (B, C) to the support line (A). Crushing device according to one or more of the preceding claims or in particular according thereto, characterized in that the angle of the web line (E) to the support line (A) is between 25 ° and 35 °. Crushing device according to one or more of the preceding claims or in particular according thereto, characterized in that the two gripping arms (3, 4) are formed by die-cast parts and / or that the bearing surface (11) of a sheet metal part (22), in particular a punched / bent part is formed, which in particular has a U-shape. Crusher for plate-shaped workpieces, such as slates, cement slabs or the like, with two levers (1, 2), each having a handle arm (3, 4), a crushing arm (5, 6), and an intermediate bearing portion (7, 8) in that the bearing sections (7, 8) are pivotally connected to one another about a pivot axis (9) such that one of a break arm (5) moves when closing the device from an open position to a closed position by pivoting together the two grip arms (3, 4). formed cutting edge (10) in a on one of the other Brecharm (6) formed bearing surface (11) resting workpiece enters, with a mouth (17), two opposing walls (16 ') and a bottom (16 ") having insertion slot ( 16), which is crossed when closing the lever (1, 2) of one of the mouth (17) adjacent pin (18), characterized by a between Hole pin (18) and bottom (16 ") arranged stop element (19) whose distance from the pin (18) is adjustable. Crushing device according to claim 5 or in particular according thereto, characterized in that the stop element (19) can be brought by pressing a threaded element (20) from a cuffed position into a released position in which the distance is variable. Crusher for plate-shaped workpieces, such as slates, cement slabs or the like, with two levers (1, 2), each having a handle arm (3, 4), a crushing arm (5, 6), and an intermediate bearing portion (7, 8) in that the bearing sections (7, 8) are pivotally connected to one another about a pivot axis (9) such that one of a break arm (5) moves when closing the device from an open position to a closed position by pivoting together the two grip arms (3, 4). formed cutting edge (10) enters into a on one of the other Brecharm (6) formed support surface (11) resting workpiece, wherein the two levers (1, 2) are acted upon by a spring arranged in a chamber (22) in the open position, characterized characterized in that the chamber has a cleaning opening (14) in particular for cleaning by means of compressed air. Crushing device according to claim 7 or in particular according thereto, characterized in that the chamber (2) has opposite cleaning openings (14) which are each associated with one of the two broad sides of the breaking device, the spring (22) lying between the two cleaning openings (14) , Crushing device according to one or more of the preceding claims or in particular according thereto, characterized in that the Chamber chamber walls (12 ') which are formed by a sheet metal part (12), which in particular also forms the support surface (11). Crushing device according to one or more of the preceding claims or in particular according thereto, characterized by a slot (13) arranged in the bearing surface (11), which is penetrated by a blade forming the cutting edge (10) and / or which from both sides of the bearing surface (11) forming portion of a stamped and bent part (12) is visible, and / or that the support surface (11) forming portion of a punched / bent part (12) lateral, in particular provided with windows walls and / or designed in cross-section U-shaped is.

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