EP2862681B1 - Device for dividing workpieces - Google Patents

Description

The invention relates to a device for splitting workpieces with a first and a second pliers limb, which are connected to one another in a pivotable manner by means of a bolt, wherein a gripper jaw is arranged on a first side of the intersection region and two gripping sections on the second side of the intersection region. wherein in the region of the forceps jaw at least one cutting edge is interchangeably attached to a pliers limb, wherein the pliers limb has a receptacle for the cutting edge, in which the cutting edge is positively fixed in at least two mutually perpendicular directions of movement, wherein the cutting edge of a base body with two in the Substantially parallel main surfaces and a cutting area is, and wherein the base body has at least one bore. The invention further relates to a cutting edge for a device for cutting workpieces, comprising a base body and a cutting region, wherein the base body has two substantially parallel to each other major surfaces.

Such devices are known from the prior art in various embodiments. For example, describes the DE 199 08 153 A1 such a device in the form of a pair of pliers, wherein the one pliers arm at the working end-side portion carries a removable blade which occurs by moving towards each other of the two gripping portions of the pliers arms against an anvil of the two-end portion of the other pliers arm. But there are also such pliers are known in which both pliers legs or pliers arms have a cutting edge when dividing a Workpiece, for example, a wire rope in a partial area are passed past each other, so that a scissor-like movement is performed. Depending on the hardness of the workpiece to be cut, pivoting of at least one cutting edge often occurs, so that the workpiece is pivoted out of its original position, which is oriented perpendicular to the cutting edge with its mantle surface, so that the cutting edge deviates at an angle of 90 degrees Surface of the workpiece occurs on the workpiece and the cutting process can no longer perform. Rather, resulting from such a pivoting a high load on the cutting edge or the bolt, which connects the two pincers leg pivotally in the intersection region.

In general, the interchangeable blades are connected by a screw with the pliers legs. However, such a screw connection does not have sufficient strength so that the cutting edge can move relative to the pliers leg during the dicing process, as a result of which the errors described above also occur.

The attachment of the cutting edge with a screw therefore does not lead to a permanently accurately fitting and exact lashing of the cutting edge on the pliers limbs, so that the workpiece to be divided can transversely and with an obliquely attacking force application of the respective cutting this from the associated pliers leg and thus in relation to lift off opposite cutting edge. As a result, there is a gap formation between the two cutting edges, so that a proper severing of the trapped between the two cutting wire rope is no longer possible.

A generic device is further from the US 2,745,177 known. For this purpose, the cutting edge has at a end facing the forceps jaw a bore for the passage of a screw and a pin which extends over the two side surfaces of the cutting edge and is guided in corresponding receptacles in the forceps limb. Disadvantage of this embodiment is that with an unintentional loosening of the screw, the blade is pivotable about the pin, so that a cutting inaccuracy may arise. Furthermore, the forces occurring during cutting are completely transferred to the screw.

Another device for cutting workpieces is from the US Pat. No. 2,529,949 A known. This device uses cutting edge with a cutting edge, which is located in the transition region of a major surface to a perpendicularly oriented end face of a cutting body. Furthermore, the cutting body has in its main surface a cross-sectionally V-shaped recess into which engages a retaining element of a pliers limb when the blade body is inserted.

Based on this prior art, the invention has the object , a generic device such that the problems outlined above are avoided and in particular a satisfactory cutting action over a longer period is ensured.

The solution to this problem provides that the main body has an antiparallel to the main surfaces extending inclined surface, which comes so in a recording in the recording of a surface of the recording to the plant, that the cutting edge is inserted into the receptacle up to a certain range and wedged there.

In the apparatus according to the invention, it is therefore provided that the cutting edge is fixed in position in two orthogonal axes directions, so that the forces impinging on the cutting edge by the dicing process are not transmitted via the screw connection into the forceps limb but via the fixing of the cutting edge in the Inclusion of the forceps leg to be initiated in these. In this case, it has proved to be particularly advantageous to align one of the fixed directions of movement parallel to the application of force to the cutting edge and to select the second fixed direction of movement such that this is the direction of movement parallel to the longitudinal axis direction of the fastening screw.

According to a further feature of the invention it is provided that the receptacle is formed as an insertion opening extending at right angles to the longitudinal axis of the bolt in the crossing region. This embodiment has the advantage that such an insertion opening can be designed precisely to the geometric configuration of the cutting edge. The cutting edge is then guided accurately and it can also be used only for the appropriate device suitable cutting, so that incorrect functions due to incorrect cutting can be excluded.

It is provided according to a further feature of the invention that the cutting edge is screwed in the region of the receptacle with a pliers limb. In principle, an exclusively latching fastening of the cutting edge on the forceps limb could also be provided. But a screw increases security against accidental slipping out of the cutting from the recording.

It is further provided that the cutting edge consists of a base body with substantially parallel to each other extending main surfaces and a cutting area, wherein the base body has at least one bore and an anti-parallel to the main surfaces extending inclined surface. The inclined surface makes it possible to facilitate the insertion of the cutting edge into the receptacle and at the same time to ensure adequate securing of the cutting edge against unintentional slipping out of the receptacle. At the same time, the inclined surface also serves to allow the cutting edge to be pushed into the receptacle up to a certain area and wedged there.

According to a further feature of the invention it is provided that each pliers limb has a cutting edge which is arranged interchangeably in a respective receptacle of the respective pliers limb. As a result, the operation of the device according to the invention is significantly improved.

A further development of this embodiment provides that the cutting edges of the workpiece to be sheared can be guided past one another.

Furthermore, it is provided that the two pliers legs can be fixed relative to one another via a latching element. The setting of the two forceps legs is usually done with closed forceps jaw, so that the two cutting edges are not open and thus pose a risk of injury. So it is the pivoting movement of the two forceps legs locked to each other. For this purpose, a semi-circular notch with a head-side shutter has been found to be suitable, wherein the head side arranged shutter is under Belleville washer preload.

With regard to a cutting edge according to the invention, it is provided as a solution to the above-described object that the main body has two main surfaces extending essentially parallel to one another and an antiparallel to the main surfaces extending, the insertion into a receptacle facilitating and ensuring sufficient protection against accidental slipping out of the receptacle ensuring inclined surface that oblique surface and cutting area are sloping starting from a major surface in opposite directions, that the main body is substantially L-shaped and a first Leg and a second leg, wherein along an outer edge of the second leg of the cutting area is arranged and that on the inclined surface of the base body in the receptacle on a surface of the receptacle comes to rest and can be wedged in the receptacle.

As already stated above, this embodiment has the advantage that the cutting edge according to the invention can be introduced in a simple manner into a corresponding receptacle in a precise position, wherein the main body rests with a main surface on a guide surface of the receptacle and the receptacle to be brought into contact with the inclined surface in contact Contact surface has. The main body is inserted into the receptacle until the oblique surface is substantially flush with the corresponding contact surface. This can be done by a pushing movement of the cutting edge in the recording. The cutting edge is thereby arranged in the exact position in the receptacle and in particular and at least by two mutually perpendicular directions of movement can be fixed positively. This configuration makes a corresponding body very easy to handle and by the shape of an L can also be given an orientation of the body relative to the recording, so that the insertion of the cutting into the recording can be done without errors even without prior knowledge. It can therefore be carried out by laymen in a simple manner.

According to a further feature of the invention it is provided that the base body has at least one bore which serves to receive a screw connection, so that the cutting edge can be fixed in a form-fitting manner in the receptacle.

Preferably, the inclined surface and the cutting edge region are oriented sloping in opposite directions starting from a main surface. By this configuration, the possibility is given in the cutting area to use this above the cutting surface as a finger approach to insert the cutting edge into the receptacle and thereby avoid injury.

A preferred embodiment of the cutting edge further provides that the cutting area is concave. This refinement achieves the advantage that, in the case of a workpiece that is circular in cross-section, the cutting area abuts on the workpiece as far as possible over a large contact surface in the length direction, so that the cutting process is simplified.

Finally, it is provided that an end face of the second leg is circular arc-shaped, in particular semicircular. This embodiment has the advantage that, with a corresponding configuration of the receptacle, an automated centering and thus a positionally accurate arrangement of the cutting edge in the receptacle takes place.

Figur 1

eine Vorrichtung zum Zerteilen von Werkstücken in Form einer Zange in Ansicht;

Figur 2

die Vorrichtung gemäß Figur 1 in Seitenansicht;

Figur 3

die Vorrichtung gemäß den Figuren 1 und 2 in Frontansicht;

Figur 4

die Vorrichtung gemäß den Figuren 1 bis 3 in Detailansicht bei geöffnetem Zangenmaul;

Figur 5

einen Teil der Vorrichtung gemäß den Figuren 1 bis 4 in Ansicht;

Figur 6

die Vorrichtung gemäß Figur 5 in geschnitten dargestellter Ansicht entlang der Schnittline VI-VI in Figur 5;

Figur 7

eine Schneide für die Vorrichtung gemäß den Figuren 1 bis 6 in Ansicht;

Figur 8

die Schneide gemäß Figur 7 in geschnitten dargestellter Seitenansicht entlang der Schnittlinie VIII-VIII in Figur 7;

Figur 9

die Schneide gemäß den Figuren 7 und 8 in Seitenansicht:

Figur 10

die Schneide gemäß Figur 9 in einer geschnitten dargestellten Seitenansicht entlang der Schnittlinie X-X in Figur 9.

Further features and advantages of the invention will become apparent from the following description of the accompanying drawings, in which a preferred embodiment of a device according to the invention is shown. In the drawing show:

FIG. 1

a device for cutting workpieces in the form of a pair of pliers in view;

FIG. 2

the device according to FIG. 1 in side view;

FIG. 3

the device according to the Figures 1 and 2 in front view;

FIG. 4

the device according to the FIGS. 1 to 3 in detail view with open forceps jaw;

FIG. 5

a part of the device according to the FIGS. 1 to 4 in view;

FIG. 6

the device according to FIG. 5 in sectional view along the section line VI-VI in FIG. 5 ;

FIG. 7

a cutting edge for the device according to the FIGS. 1 to 6 in view;

FIG. 8

the cutting edge according to FIG. 7 in cut side view along the section line VIII-VIII in FIG. 7 ;

FIG. 9

the cutting edge according to the FIGS. 7 and 8 in side view:

FIG. 10

the cutting edge according to FIG. 9 in a sectional side view along the section line XX in FIG. 9 ,

In the FIGS. 1 to 6 a device according to the invention for the division of workpieces in the form of a pair of pliers 1 is shown. The pliers 1 consists of a first pliers limb 2 and a second pliers limb 3. In an intersection region 4, the two pliers limbs 2.3 are pivotally connected to each other. For this purpose, a bolt 5 is provided, which passes through corresponding holes in the two pliers legs 2, 3.

On one side of the crossing region 4 is a forceps jaw 6 (FIG. FIG. 4 ) and formed on the second side of the crossing region 4, two handle portions 7, wherein the handle portions 7 consist of free ends of the forceps arms 2,3, which are provided with a plastic coating 8.

In the region of the forceps jaw 6 receptacles are formed which serve to receive each a cutting edge 9, wherein the cutting edges 9 are each connected with a screw 10 with the forceps arms 2, 3, so that the blades 9 in a simple manner by the forceps arms 2, 3rd can be dismantled and thus interchangeable.

Furthermore, especially in the FIGS. 1 and 4 to recognize a locking element 11, with which the two forceps arms 2, 3 are fixable relative to each other, namely in the in FIG. 1 The latching element 11 may for example consist of a semi-circular notch, the head carries a shutter wheel, which is under bias of a plate spring.

In the FIGS. 5 and 6 the design of the receptacle 8 is shown in more detail. It can be seen that the receptacle 8 is U-shaped in cross-section and consists of a support surface 12 and a support surface 12 limiting collar 13, wherein the collar 13 forms a leg of the U-shaped receptacle 8 in cross-section. Furthermore, it can be seen that the collar 13 a for opening the receptacle 8 aligned end 14 which has a surface 15 inclined to the support surface 12.

In the region of the support surface 12, a bore 16 is arranged, which serves to receive the screw 10. In FIG. 6 It can be seen that the bore 16 widens to the outer surface of the first pliers limb 2, so that the main connection 10 to be inserted into the bore 16 can penetrate into the widened region, so that such a screw connection 10 terminates flush with the surface of the pliers limb 2.

In the FIGS. 7 to 10 the cutting edge 9 is shown in detail. The cutting edge 9 consists of a base body 17 with two main surfaces 18 extending substantially parallel to one another and a cutting region 19 which may be formed integrally with the base body 17. The base body 17 has a bore 20 which serves to receive the screw connection 10 and thus the fixation of the cutting edge 9 in the receptacle 8 of the pliers limb 2, 3. Furthermore, the base body 17 has an inclined surface 21, which comes to rest on the surface 15 of the receptacle 8 when the blade 9 is inserted into the receptacle 8.

The main body 17 is according to FIG. 7 The first leg 22 has an end face 24 which is convex, so that a rounded end face 24 of the first leg 22 results. This end face 24 is formed corresponding to the closed end of the receptacle 8, so that the first leg 22 rests with the end face 24 with a large surface area at the closed end of the receptacle 8 and is held in a form-fitting manner. Furthermore, the inclined surface 21 is at inserted into the receptacle 8 cutting edge 9 on the bearing surface 15, so that here is a positive attachment in the longitudinal axis direction of the screw connection 10 is no longer shown. Consequently, the cutting edge 9 is fixed positively in two mutually perpendicular directions of movement within the receptacle 8 and fixed by the screw 10.

The cutting region 19 is oriented at an angle deviating from 90 degrees relative to the main surfaces 18, so that the cutting region is also oriented obliquely to the main surfaces 18. Furthermore, the Cutting area 19 is concave, so that results in proper handling of the forceps 1, a very large investment line of the cutting portion 19 on the workpiece to be cut. Furthermore, it can be seen that the cutting area 19 extends along an outer edge 25 of the second leg 23.

Reference numerals:

1

tongs

2

pliers legs

3

pliers legs

4

crossing area

5

bolt

6

beaks

7

handle portion

8th

admission

9

cutting edge

10

screw

11

locking element

12

bearing surface

13

collar

14

The End

15

area

16

drilling

17

body

18

main area

19

cutting area

20

drilling

21

sloping surface

22

Thighs (1)

23

Thighs (2)

24

face

25

outer edge

Claims (10)

1. A device for dividing workpieces (1)
   comprising a first and a second tong limb (2, 3)
   which are connected to each other in a pivoting manner by means of a bolt (5) in a crossing area (4), wherein tong jaws (6) are arranged on a first side of the crossing area and two grip sections (7) are arranged on the second side of the crossing area, wherein in the area of the tong jaws at least one blade (9) is fixed in an exchangeable manner on a tong limb, wherein the tong limb (2, 3) comprises a receiving space (8) for the blade (9), in which the blade (9) is positively fixed in at least two movement directions that extend at right angles to each other, wherein the blade (9) consists of a base body (17) having two main surfaces (18) which essentially extend parallel to each other and a blade area (19), and wherein the base body (17) at least comprises one bore (20),
   characterized in that the base body (17) comprises a sloping surface (21) that extends in an antiparallel manner with respect to the main surfaces (18) and that, if the blade (9) is inserted into the receiving space (8), will get resting on a surface (15) of the receiving space (8), such that the blade (9) can be inserted into the receiving space (8) until a certain area and will become wedged there.
2. A device according to claim 1, characterized in that the receiving space (8) is designed as an insertion opening that extends at right angles to the longitudinal axis of the bolt (5) in the crossing area (4).
3. A device according to claim 1 or 2, characterized in that the blade (9) is screwed with the tong limb (2, 3) in the area of the receiving space (8).
4. A device according to one of the claims 1 through 3, characterized in that each tong limb (2, 3) comprises a blade (9) which are arranged in an exchangeable manner in respectively one receiving space (8) of the respective tong limb (2, 3).
5. A device according to claim 4, characterized in that the blades (9) can be passed along each other for the shearing load of the workpiece.
6. A device according to one of the claims 1 through 5, characterized in that the two tong limbs (2, 3) can be fixed with respect to each other via a snap-in element (11).
7. A blade for a device for dividing workpieces, in particular for a device according to one of the claims 1 through 6, consisting of a base body and a blade area, wherein the base body (17) comprises two main surfaces (18) which essentially extend parallel to each other, characterized in that the base body (17) comprises a sloping surface (21) that extends in an antiparallel manner with respect to the main surfaces (18), simplifies the insertion into a receiving space (8) and assures a sufficient protection against an unintended slipping out of the receiving space (8), that the sloping surface (21) and the blade area (19) are oriented such that they slope down in opposite directions starting from a main surface (18), that the base body (17) is essentially L-shaped and comprises a first leg (22) and a second leg (23), wherein the blade area (19) is arranged along an outer edge (25) of the second leg (23), and that the base body (17) in the receiving space (8) gets resting against a surface (15) of the receiving space (8) by means of the sloping surface (21) and can be wedged in the receiving space (8).
8. A blade according to claim 7, characterized in that the base body (17) comprises at least one bore (20).
9. A blade according to one of the claims 7 through 8, characterized in that the blade area (19) is concavely shaped.
10. A blade according to one of the claims 7 through 9, characterized in that a front face (24) of the first leg (22) is shaped like a circular arc, in particular like a semi-circle.

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