Never.

Abstract

Pliers (1) with two pliers arms (2, 3) which are rotatably mounted relative to each other in a joint area (4), wherein the pliers arms (2, 3) form a jaw area (5) on one side of the joint and handle sections on the other side of the joint, wherein the jaw area further comprises different cutting elements formed one behind the other, each formed by two cooperating working areas (6, 7, 8, 9) formed on one and the other pliers arm (2, 3), wherein the working areas (8, 9) furthest from the joint have first cutting edges (10, 11) that are at least partially overlapping or lying on top of each other when the pliers are closed and that also leave an opening when the pliers (1) are closed, and wherein the working areas (6, 7) closer to the joint have second cutting edges (14, 15) that overlap like scissors when the pliers are closed.wherein the second cutting edges (14, 15) are designed as cable shears with an acute cutting angle and curved cutting edges, and in the case of closed pliers the cutting edges overlap to a different extent over their entire length, characterized in that in a first open position the first cutting edges (10, 11) are accessible through the given opening, but the second cutting edges (14, 15) are not yet, and that the second cutting edges (14, 15) overlap with a greater degree of overlap in the jaw-side and pivot-side end regions than in a middle region, and that in the case of overlapping first cutting edges (10, 11), a crimping area (18) and / or a torch hole (25) adjoins the first and second cutting edges (10, 11, 14, 15) on the jaw-side.

Description

The invention relates to a pair of pliers according to the features of the preamble of claim 1. Pliers as such are known, for example, in the form of side cutters. Reference is made to DE 199 42 372 A1 in this regard. Pliers are also known as so-called center cutters. Reference is made, for example, to DE 94 06 868 U1 in this regard. It is also already known to form several cutting areas one behind the other on the jaw side of pliers; see, for example, DE 196 49 992 C2. In the latter type of pliers, the cutting area on the outside of the jaw consists of concealed cutting edges, while the cutting area on the inside of the jaw has a single-sided cutting edge. Furthermore, reference should be made to the unpublished documents of DE 10 2009 044 107 A1. In the pliers described in this application, the first cutting edges are designed to be either lying on top of each other or spaced apart from each other. A corrugated pipe cutter is known from DE 196 49 992 C2. The corrugated pipe cutter only has cutting working areas. From DE 94 06 868 U1 a bolt cutter is known which has an oval-shaped opening near the joint for the purpose of cutting bolts made of high-strength or brittle material. From DE 199 42 372 A1 a cutting pliers, such as side cutters or center cutters, is known, without working areas for stripping. US patent 2003 / 0 041 382 A1 discloses a pair of pliers in which the second cutting edges are already accessible when the first cutting edges are not yet accessible for stripping a cable. Pliers with the same characteristics are also disclosed in US patent 2004 / 0 118 251 A1. US Patent 1,361,301 A describes a tool for securing a detonator to a time fuse. Cutting edges are formed near the joint. US Patent 3,831,207 A discloses a pair of pliers in which the second set of cutting edges lie against each other when the pliers are closed. When the first set of cutting edges is moved into the fully open position, the second set of cutting edges is also accessible. A pair of pliers is known from US Patent 3,947,905 A, which has only straight secondary cutting edges. When the pliers are closed, the secondary cutting edges do not overlap more on the jaw side than on the joint side. A comparable pair of pliers is also known from US Patent 2006 / 0 005 315 A1. From JP H07 - 298 439 A, a pair of pliers with straight cutting edges and only the first cutting edges is known. US Patent 4,050,152 A discloses pliers with a second set of curved cutting edges, in which the first set of cutting edges overlaps completely when the pliers are closed, resembling scissors. A wire stripping opening is not provided. From GB 1 443 913 A, a pair of pliers with first and second cutting edges is known, wherein the second cutting edges do not overlap over their entire length when the pliers are closed. When the first cutting edges are opened, the second cutting edges are also accessible at the same time. Based on a prior art according to US 2003 / 0 041 382 A1, the invention addresses the problem of providing pliers with first and second cutting edges arranged one behind the other on the jaw side, which in particular enables favorable wire / or cable processing. This problem is solved in the subject matter of claim 1, wherein the focus is on the fact that in a first opening position the first cutting edges are accessible through the given opening, but the second cutting edges are not yet accessible, and that the second cutting edges overlap with a greater overlap in the jaw-side and hinge-side end region than in a middle region, and that in the case of overlapping first cutting edges, a crimping area and / or a burner hole adjoins the first and second cutting edges on the jaw-side side. The first cutting edges spread apart in a V-shape when the pliers are opened, allowing a cable or wire to be easily inserted and stripped even in confined spaces. The second cutting edges, which lie overlapping like scissors when the pliers are closed, extend towards the joint. This allows for the safe and complete severing of any remaining wire or cable when the pliers are advanced further, for example, after initial stripping with the first cutting edges. Alternatively, the pliers can be fully opened immediately, allowing a wire or cable to be advanced directly to the second cutting edges – or the pliers to be moved relative to the cable – and then used like cable shears to completely cut the wire or cable.Wire or cable can be used during the closing of the pliers. The cutting action on a workpiece can be performed sequentially, either by moving the pliers towards the workpiece or by moving the workpiece into the pliers, with varying degrees of machining. The second set of cutting edges also contributes to the stability of the pliers. When using the first set of cutting edges, they prevent gapping perpendicular to the opening movement in at least one direction and when the pliers are not fully open. The design in the area of ​​the second set of cutting edges can also be configured, for example, with interlocking profiles, to prevent gapping in both directions perpendicular to the opening plane of the pliers jaws. Using the second set of cutting edges results in significantly more stable operation in a section of the pliers, as this area is close to the joint. When the pliers are closed, the second cutting edges overlap to a greater extent on the jaw side (opening direction) than on the hinge side. The overlap of the second cutting edges varies along their entire length (relative to the longitudinal extent of the pliers) when the pliers are closed. The overlap of the cutting edges can reach a minimum. The first cutting edges are limited on the hinge side by overlapping stop elements when the pliers are closed. These stop elements only allow access to the second cutting edges after the pliers have reached a certain opening angle. For the second cutting edges, which overlap more significantly on the jaw side, it is advantageous to integrate these stop elements directly with the second cutting edges. In addition to the cutting work areas, further work areas may be provided that do not perform a cutting function or perform a very specific cutting function. In particular, such work areas may initially be gripping or burner hole work areas. A burner hole is, as is well known, the familiar area of ​​combination pliers that, when the pliers are closed, defines an oval-shaped opening and is composed of serrated areas in longitudinal cross-section. The work areas that form a stripping area or that cooperate for stripping when the pliers are in use are located in the area of ​​the first cutting edges. These work areas are designed as indentations, e.g., semicircular indentations, that extend from the cutting edge transversely to the direction of travel of the pliers.Preferably, two indentations are formed on each working area, arranged one behind the other in the longitudinal direction of the pliers, and each indentation is formed opposite the other. It is particularly preferred that such indentations on the interacting cutting edges combine to form a circular shape, for example, when the pliers are closed. In this case, one of the cutting edges may have a larger portion than a semicircular part of this combined circular shape, and the other cutting edge a smaller portion. The stripping working areas of the pliers, which interact in conjunction with each other, retain an opening even when the pliers are closed. Preferably, each of the multiple stripping areas arranged one behind the other along the length of the pliers retains an opening. These openings can vary in size among the stripping areas. Accordingly, the cutting edges forming a stripping area overlap only outside of these openings when the pliers are closed. In particular, the burner hole and / or the gripping jaw and / or working areas that interact in the form of a crimping point are formed on the jaw side of the second cutting edge and, more preferably, on the jaw side of the first cutting edge. It is particularly preferred that the combination of cable cutters, at least one stripping hole, crimping point, torch hole, and gripping jaws is formed on a single pair of pliers, preferably in the sequence mentioned above, viewed from the joint towards the free end of the jaws, on one side of the joint. The cable cutters have an acute cutting angle and one or two convexly ground cutting edges. Both have a curved cutting edge, which preferably has a significantly larger overlap at the front, on the jaw side, than at the joint side. The jaws of the pliers can be spring-loaded into an open position, or a locking element can be provided that can be moved to either an open position, allowing the pliers to open to their maximum extent, or a closed position. However, the closed position does not correspond to the working sections being completely overlapping or overlapping, but rather to a certain initial opening position. This initial opening position is chosen so that, in the case of the pliers in question, which have two cutting sections arranged one behind the other, the first cutting section is accessible through the opening, but the second is not yet. When the pliers are opened, the cutting edges spread apart in a V-shape, allowing cables or wires to be cut cleanly and efficiently even in confined spaces.The subsequent second set of cutting edges, which overlap like scissors when the pliers are closed, allows, for example, the safe and complete severing of any remaining parts by moving the pliers further forward after an initial cut has been made with the first set of cutting edges. The cutting action on a workpiece can thus be performed sequentially, with different cutting methods, either by moving the pliers further towards the workpiece or by moving the workpiece into the pliers. The second set of cutting edges also contributes to the stability of the pliers. When the first set of cutting edges is in use, they prevent gaping perpendicular to the opening movement, at least in one direction and when the pliers are not fully open. The design in the area of ​​the second cutting edge, for example, with interlocking profiles, can also be such that gaping is prevented in both directions.Using the second cutting edge results in a significantly more stable area of ​​the pliers, as it is close to the joint. When the pliers are closed, the first cutting edges are limited by overlapping stop elements, which only allow access to the second cutting edges after the pliers have reached a certain opening angle. In addition to the cutting work areas, further work areas may be provided that do not perform a cutting function or perform a very specific cutting function. In particular, gripping or burner hole work areas may be provided. A burner hole is the area of ​​combination pliers that, when the pliers are closed, forms an oval-shaped opening and is composed of serrated sections. Work areas that form a stripping area may also be provided. Such work areas may be separate or integrated into the first cutting edges. This integration takes the form of stripping recesses in the respective work area that, when closed, form a complete, closed shape. The aforementioned additional working areas are preferably formed on the mouth side of the working areas forming the first cutting edges. The invention is further explained below with reference to the accompanying drawings, which, however, only represent one embodiment. These show: Fig. 1 a top view of pliers in the closed position, front area; Fig. 2 a view according to Fig. 1, in a partially open position; Fig. 3 a view according to Fig. 1 or Fig. 2, in the fully open position; Fig. 4 a cross-section through the object according to Fig. 1, cut along line IV-IV; Fig. 5 a cross-section through the object according to Fig. 1, cut along line VV; Fig. 6 a view of the pliers in the closed position (slightly spread); Fig. 7 a side view of the pliers, in particular in the area of ​​the locking element; Fig. 8 a further view with respect to the locking element; and Figs. 9-15 pliers of further embodiments (not part of the invention). The figure shown and described, initially with reference to Fig. 1, is a pair of pliers 1, which has two handles 2, 3 (only partially shown here) that are rotatably mounted relative to each other in a joint 4. On one side of the joint, the handles 2, 3 form grip sections, and on the other side, a jaw section 5. The jaw section 5 has different cutting elements arranged sequentially, i.e., one after the other, along a longitudinal line LL. Each of these cutting elements is formed by two cooperating working areas 6, 7 and 8, 9, respectively, located opposite each other on the handles 2 and 3. The working areas 8, 9 furthest from the joint form first cutting edges 10, 11, which, when the pliers are closed, overlap in the closed position of the pliers 1 shown in Fig. 1. In this specific embodiment, a stripping area is formed, with two stripping openings 12, 13. The stripping openings are clearly circular in the closed position. Larger portions of the circular shape are formed by an indentation in cutting edge 10, and smaller portions of the indentation are formed by cutting edge 11. This refers to the specific embodiment shown. The proportions can also be equal, or the larger portion can be formed by cutting edge 11 and the smaller portion by cutting edge 10. The working areas 6, 7 closer to the joint form second cutting edges 14, 15 which, when the pliers are closed, are moved over each other in a scissor-like manner (see dashed representation of the cutting edge 15 in Fig. 1). The second cutting edges 14, 15 exhibit different overlap dimensions u with respect to a distance a from the joint or joint area 4. The overlap dimension u is preferably larger on the jaw side than on the joint side. When the pliers 1 are opened, see approximately Fig. 2, the tip-side sections 16, 17 of the working areas 6, 7 form a boundary with respect to an insertion area E for a workpiece with respect to the working areas 8, 9. With further opening, see approximately Fig. 3, in the opening direction, these sections 16 and 17 then allow a workpiece, e.g., a cable, to be inserted or pushed through to the cutting edges 14, 15. This does not affect the possibility of sliding a partially opened pair of pliers 1 from above, with respect to the cutting edges 14, 15, onto a workpiece, e.g., a wire to be cut or a cable to be stripped, with a movement transverse to a pivot plane of the cutting edges 14, 15, or of guiding the workpiece, wire, or cable through the opening exposed by the cutting edges 14, 15 when the pliers are partially opened. Furthermore, a rotary locking element 28 is provided, with which the closed position of the pliers according to Fig. 6 or the fully open position of the pliers, for example according to Fig. 3, can be achieved. The aforementioned closed position is characterized by the fact that there is nevertheless a certain opening that allows access to the crimping area and / or the first cutting edges. With regard to the rotary locking part as such, particular reference is also made to the documents of the German patent application 10 2010 000 558 A1 . The jaw 3 and jaw 2 of the clamp form sliding plate areas 29, 30 in the joint area, see also Fig. 7. These plate areas have a significantly larger width B than the average width b of jaw 2 or 3. The width B is approximately 1.5 to 3 times the width b. The rotary locking element 28 is rotatably mounted on one of the jaws, here jaw 3. The mounting point, here formed as the axis of rotation, is located in the transition area of ​​jaw 3 to the plate area of ​​that jaw. Support on the other jaw 2 is provided by the plate area 30 of jaw 2, both in the open and closed positions. As can be seen particularly from a comparison of Figs. 3 and 6, the jaw 2 of the pliers forms both a first locking surface 31 and a second locking surface 32 for securing the pliers in an (approximately) closed position, Fig. 6, as well as for limiting an open position of the pliers, Fig. 3. The open position of the pliers can also be limited in other ways. In this respect, the second locking surface 32 may also be unnecessary. The rotary locking element 28 can have its rotational movement limited by a stop. This can already be achieved by the geometry of the plate part 29 and / or 30. Another possibility is explained below with reference to Fig. 9. In this embodiment, the stop surface is formed by a pointed area 33 of the rotary locking element 28. This pointed area 33 is formed by a secant-shaped boundary surface 34 and a substantially tangential further boundary surface 35, in the area of ​​intersection of which they intersect. With respect to a diameter line D, the perpendicular projection of surface 34 is laterally offset, but within a radius defined by the dimension of the circular section of the rotary locking element 28, as defined by the diameter along the diameter line D, and thus forms a rotation axis 36 of the rotary locking element 28, in this sense extending in a secant-shaped manner. The diameter line D is selected such that it does not intersect the boundary surface 34. Furthermore, the rotary locking element 28 is arranged in relation to an outer edge 37 of the jaw 3 of the pliers. It is arranged in such a way that it can be rotated by a finger of a human hand resting on the outer edge 37 or sliding along the longitudinal side of the jaw 3 of the pliers. In further detail, it can be seen that in the exemplary embodiment, the rotary locking element 28 projects beyond the outer edge 37 by a dimension v. The dimension v can also vary depending on the rotational position of the rotary locking element 28. The dimension v is preferably relatively small. It more preferably corresponds to 1 / 10 to 5 mm. The rotary locking element 28 can also be arranged flush with the outer edge 37 or, even more preferably, e.g. within the same distance range as described above, be provided offset inwards to the outer edge 37. In detail, it can be seen that the rotary locking part 28 is basically designed as an adjusting wheel. With respect to the geometric axis of rotation 36, areas protrude to varying degrees around the circumference, so that in this respect it can also be described as an eccentric part. The rotary locking element 28, in the form of the adjusting wheel shown here, further features knurling around its circumference. The knurling is only present over a portion of the circumference, corresponding to the outer edge 37 in the respective position. As can be seen in particular from the sectional view in Fig. 8, the rotary locking element 28 is arranged in the area of ​​the plier arm 3, which has a smaller thickness w compared to the thickness W of the plier arm, particularly in the handle area. The thickness w corresponds to ¼ to ¾ of the thickness W, and all intermediate values ​​in this area, particularly in 1 / 10 thickness increments, are hereby included in the disclosure, both for reductions of the area from above and / or for representing more singular values ​​in this area. Furthermore, it is also important that the rotary locking element 28, which is arranged at the transition to or within the plate portion of the jaw 3, is again arranged in a recess X within this plate portion, see Fig. 8. A portion of its height is therefore, in a side projection, located within the height range of the plate portion of the jaw 3. The surface 39 is recessed relative to the corresponding surface of the jaw 2. In further detail, in the exemplary embodiment, the rotary locking element 28 is formed with a fixed pivot axis 40 anchored in the plate part of the jaw 3, about which the rotary locking element 28 can be adjusted by rotation. The pivot axis 40 is preferably clamped in the plate part of the jaw 3. The positive locking of the rotary locking element 28, which is designed here as a wheel, is achieved by the axle head 41, which is larger than the diameter of the pivot axis. To determine the (at least partial) closed position of the pliers, the rotary locking part 28 has a pointed area 33 that extends beyond the circumference of the circular shape in the knurled area. Following the first and second cutting edges, a crimping area is located on the jaw side. This area is characterized by two crimping projections 19 and 20, which are positioned side by side in the longitudinal direction L and inserted into corresponding crimping recesses 21 and 22 of the respective opposing working area when the pliers are closed, as shown. This leaves an opening 23 or 24 on the tip side of a crimping projection 19 and / or 20. A crimping projection 19 itself can, as also shown, be blunt at the tip. The crimping projection 19 can preferably be designed with a finishing surface that runs approximately parallel to the longitudinal extent of the pliers. This is preferably followed by a burner hole 25. At the tip end, a profiled gripping surface 26 and / or, in the case of "and", preferably a smooth gripping surface 27 extending towards the free end of the jaw, are attached. The gripping surfaces 26, 27 are formed by identically shaped, opposing working areas. Figures 4 and 5 show the overlapping shape in the area of ​​the first cutting working areas or cutting edges 8, 9 in further detail. It can be seen that an area c is present when the pliers are closed, in which the areas overlap. This is the case with the blunt design of the free edge edges. In the area of ​​a stripping opening 12, see Figure 4, the stripping opening is clearly formed by the projected overlap of the correspondingly shaped cutting areas. The overlap dimension c preferably corresponds to half to, for example, five times the diameter or largest opening dimension in the opening direction of the pliers jaws of a stripping opening 12. Figures 6, 7 to 8 show further details of the pliers, in particular with regard to the rotary locking part or rotary locking part 28.

Claims

Pliers (1) with two pliers arms (2, 3) which are rotatably mounted relative to each other in a joint area (4), wherein the pliers arms (2, 3) form a jaw area (5) on one side of the joint and handle sections on the other side of the joint, wherein the jaw area further comprises different cutting elements formed one behind the other, each formed by two cooperating working areas (6, 7, 8, 9) formed on one and the other pliers arm (2, 3), wherein the working areas (8, 9) furthest from the joint have first cutting edges (10, 11) that are at least partially overlapping or lying on top of each other when the pliers are closed and that also leave an opening when the pliers (1) are closed, and wherein the working areas (6, 7) closer to the joint have second cutting edges (14, 15) that overlap like scissors when the pliers are closed.wherein the second cutting edges (14, 15) are designed as cable shears with an acute cutting angle and curved cutting edges, and in the closed pliers the cutting edges overlap to varying degrees over their entire length, characterized in that in a first open position the first cutting edges (10, 11) are accessible through the given opening, but the second cutting edges (14, 15) are not yet, and that the second cutting edges (14, 15) overlap to a greater extent in the jaw-side and pivot-side end regions than in a middle region, and that in the case of overlapping first cutting edges (10, 11), a crimping area (18) and / or a torch hole (25) adjoins the first and second cutting edges (10, 11, 14, 15) on the jaw-side. Pliers according to claim 1, characterized in that the second cutting edges (14, 15) overlap to a greater extent on the jaw side in the opening direction of the pliers than on the joint side. Pliers according to one of the preceding claims, characterized in that the overlap of the second cutting edges (14, 15) passes through a minimum in the longitudinal direction of the pliers (1). Pliers according to one of the preceding claims, characterized in that the pliers (1) have, in addition to the cutting working areas, further working areas such as gripping, burner hole or stripping working areas, wherein the further working areas can be formed on the jaw side of the working areas forming the first cutting edges (10, 11). Pliers according to one of the preceding claims, characterized in that the pliers legs (2,3) form overlapping plate areas (29,30) in the joint area, which are formed with a width (B) corresponding to approximately 1.5 to 3 times the width (b) relative to a mean width (b) of a pliers leg (2,3). Pliers according to one of the preceding claims, characterized in that a region with a crimp projection (19, 20) adjoins the first and second cutting edges on the jaw side. Pliers according to claim 6, characterized in that an opening (23, 24) is left on the tip side of the crimping projection (19, 20) when the pliers are closed. Pliers according to one of claims 6 or 7, characterized in that a gripping area or a burner hole is connected to the tip side of the crimp projections (19, 20) and / or a profiled gripping surface (26) and then a smooth gripping surface (27) are connected to the tip side. Pliers according to one of the preceding claims, characterized in that in the area of ​​the first cutting edges (8,9) when the pliers are closed, there is an area in which the areas are overlapped and that an overlap dimension (c) of one half corresponds to up to 5 times a diameter or largest opening dimension in the opening direction of the pliers jaws of a stripping opening (12). Pliers according to one of claims 4 to 9, characterized in that a combination of cable shears, at least one stripping opening (12, 13), a crimping area (18), a burner hole (25) and gripping jaw is formed together and in the sequence mentioned above, viewed from the joint area (4) towards the free end of the jaw area (5), on one side of the joint area (4).

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