Stripping pliers

Description

field of technology

[0001] The invention relates to a wire stripper according to the features of the preamble of claim 1. State of the art

[0002] Wire strippers of the type in question are known. These are used for stripping electrical cables. In this context, so-called automatic wire strippers are known, which cut the insulation in a single step and then, as the handles are squeezed together, pull it off the conductor. The cutting depth of the jaws must be adjusted to the thickness of the insulation layer to avoid damaging the exposed conductor.

[0003] In this context, wire strippers are known which automatically adjust the cutting depth of the cutting jaws depending on the cable thickness. Reference is made, for example, to EP 1 557 920 B1 (US 7,513,177 B2), which discloses wire strippers according to the features of the preamble of claim 1.

[0004] From EP 3054541 A1, a wire stripper is known in which the cutting depth of the cutting edges of the cutting jaws can only be adjusted manually and, in an embodiment described as feasible, only on one side. Summary of the invention

[0005] Starting from the aforementioned prior art, the invention deals with the task of further developing a wire stripper, as known from EP 1557920 B1, in such a way as to achieve a refined cutting depth adjustment.

[0006] This problem is solved according to the invention by the subject matter of claim 1.

[0007] According to the proposed design, in addition to an automatic adjustment of the cutting depth due to the enabling relative displacement of the cam section on which the associated cutting jaw is supported, as is further known from the aforementioned prior art, manual adjustment of the cam section is also made possible.

[0008] Experience has shown that the thickness of the insulation to be cut and subsequently removed can vary, even between different batches or cables from different manufacturers with the same conductor cross-section. In such cases, the cutting depth can be adjusted according to the proposed solution. The relative displacement of the cam section to the associated cam is independent of the clamping jaw position.

[0009] With regard to manual adjustment, a suitable handle can be provided on the wire stripper, with the help of which the cutting depth of the cutting jaws, which is automatically adjusted during the use of the wire stripper, can be further reduced or increased.

[0010] One jaw of the pliers is fixed, and the other jaw is movable, rotating relative to the fixed jaw. The fixed jaw may be rigidly connected to its corresponding handle, while the movable jaw may be only indirectly connected to the handle, for example, via a lever mechanism that causes the movable jaw to pivot relative to the fixed jaw when the handles are pressed together.

[0011] According to the invention, the cam element is slidably mounted on the movable jaw of the pliers with respect to a (geometric) axis of rotation. The displacement of the cam element relative to the associated cam is preferably limited. A possible displacement path of the cam element can be adjusted depending on the cable thickness due to the known automatic cutting depth adjustment. Furthermore, the possibility of manual intervention is provided, allowing the initial position of the cam element relative to the cam to be changed. From this potentially changed initial position, the relative displacement of the cam element to the cam occurs when the handle parts are compressed.

[0012] In further detail, the cam element is preferably displaceable by means of a connecting rod and / or a linkage rotatably connected to it. The actual rotation angles resulting from insulation removal are comparatively small, for example, only in the range of single-digit degrees or up to, for example, 20 degrees. A pivot axis formed between the connecting rod and / or the linkage and the cam element can preferably be used to change the relative initial position. For example, the pivot axis can be designed as an eccentric component, so that the distance to the cam element can be changed starting from a geometric axis of rotation.

[0013] The inherently movable rotary bearing of such a rotary axis provides the necessary mobility while simultaneously guiding it.

[0014] The axis of rotation can therefore be adjusted independently of the closing position of the jaws relative to each other, either with respect to the movable jaw or the fixed jaw. Fine-tuning of the automatic cutting depth adjustment is achieved by changing the initial position of the axis of rotation.

[0015] Two cam components are provided, with a first cam component acting on the cutting jaw associated with the movable jaw of the pliers and a second cam component acting on the cutting jaw associated with the stationary jaw of the pliers. The first cam component interacts with a first cam in the movable jaw of the pliers, and the second cam component interacts with a second cam in the stationary jaw of the pliers.

[0016] Furthermore, the displacement of the cam components relative to the cams or the associated jaws is coupled, so that, according to the cited prior art, the cam components experience equal displacement distances during handling of the wire stripper. Even with the manual adjustability proposed according to the invention, independent of the closed position of the jaws, a preferred embodiment ensures equal action on both cam components.

[0017] The cam element associated with the movable jaw of the pliers is mounted in the stationary jaw of the pliers via a first axis guided in a first elongated hole. In a preferred embodiment, the axis of rotation formed by this axis extends transversely to a displacement direction of the cam element, as well as transversely to a displacement direction of the associated cutting jaw. The cam element associated with the stationary jaw of the pliers is mounted in the movable jaw of the pliers via a second axis guided in a second elongated hole. This second axis also extends with its geometric axis of rotation preferably transversely to a displacement direction of the cam element. Thus, in one possible embodiment, the cam element is indirectly, and preferably only via a portion of the pivot path of the movable jaw of the pliers, coupled to the movable jaw.

[0018] The engagement of the first axis in the first elongated hole, as well as the engagement of the second axis in the second elongated hole, provides guidance and allows for relative displacement of the respective cam section to the jaw of the pliers containing the elongated hole. The longitudinal boundary of the elongated hole can act as a stop for the axis, thus further defining the maximum adjustability of the cutting depth of the jaws.

[0019] With regard to a (manual) presetting of the initial position of one or both cam sections, the relative arrangement of the first and / or second axis in the first and / or second elongated hole can be adjusted independently of the pivoting position of the clamping jaws relative to each other. Alternatively, such an independent adjustment can be achieved by acting at another point on a sliding mechanism of the cam section(s). The sliding mechanism is provided here by the aforementioned link and / or connecting rods. A different initial position of the axis(es) relative to the associated elongated hole is possible before the start of stripping. With such an initial position, a further automatic adjustment of the cutting depth occurs during the closing of the pivoting jaws and the gripping of a cable to be stripped between the clamping jaws.

[0020] Additional manual adjustability is achieved via a first and / or second eccentric. The eccentric can, preferably, be rotatably arranged about a geometric axis running parallel to the aforementioned pivot axes of rotation on the cam side, optionally with limited rotatability. It can, for example, be an eccentric disc whose wall, rotating eccentrically to the axis of rotation, acts directly or indirectly on the cam side.

[0021] In the case of two eccentrics, they can be identical in design. However, different designs are also possible, preferably with the adaptation of a transmission element connected between the eccentric and the associated cam section.

[0022] According to the invention, the first and second eccentrics are formed on a common eccentric part with a common axis of rotation. The eccentric part can, preferably, be a single-piece component, optionally also formed from a single material.

[0023] For indirect interaction of the eccentrics with the cam components, the first and / or second eccentrics are connected to the first and second axles, respectively, by means of a first and a second link section. In a preferred embodiment, the eccentric can act directly on the link.

[0024] The fine adjustment of the cutting depth made possible by the proposed solution can be achieved, for example, by directly rotating the eccentric part. For this purpose, the eccentric part can be extended outwards for operation and may also include a handle.

[0025] Due to the fine adjustment that is possible, the cutting depth can be adjusted beyond the automatic adjustment, with the manual adjustment offering cutting depth regulation in the hundredths of a millimeter range, e.g. down to a tenth of a millimeter. Brief description of the drawings

[0026] The invention is explained below with reference to the accompanying drawing, which, however, only represents an exemplary embodiment. The drawing shows: Fig. 1 in perspective view of wire strippers; Fig. 2 in perspective close-up view of a pair of cutting jaws; Fig. 3 the pair of cutting jaws in side view; Fig. 4 another perspective view of the pair of cutting jaws; Fig. 5 the section along line VV in Figure 4 ; Fig. 6 a longitudinal section view through the wire stripper, relating to an unactuated basic position; Fig. 7 one of the Figure 6corresponding representation, but concerning an intermediate position during operation; Fig. 8 a subsequent representation to Figure 7 during further operation of the wire stripper; Fig. 9 a subsequent illustration to Figure 8 , concerning the actuation end position; Fig. 10, essentially the Figure 7 corresponding longitudinal section view of the wire stripper, relating to a release position of a pull rod to enable a change of the cutting jaw pair; Fig. 11 the magnification of area XI in Figure 6 ; Fig. 12den in Figure 11 The area shown is in a partially cutaway perspective view; Fig. 13 is another perspective exploded view of the area shown in the Figure 11 and 12 of the area shown; Fig. 14 a clamping jaw of the wire stripper in front view; Fig. 15 the clamping jaw in another view; Fig. 16 the clamping jaw in side view; Fig. 17 the magnification of area XVII in Figure 16; Fig. 18 the top view of the clamping jaw according to arrow XVIII in Figure 14; Fig. 19 the section according to line XIX-XIX in Figure 18 ; Fig. 20 the section according to line XX-XX in Figure 18 ; Fig. 21 a cutting edge of a cutting jaw in perspective view; Fig. 22 the section along line XXII-XXII in Figure 21 through the cutting edge; Fig. 23 the cutting edge in an enlarged side view; Fig. 24 an enlarged schematic sectional view of the arrangement of both cutting edges of the pair of cutting jaws; Fig. 25 a perspective view of the jaw area of ​​the pliers with the cable to be stripped inserted between the jaws; Fig. 26 a partially exploded perspective view of area XXVI in Figure 1 ; Fig. 27 in exploded view the jaws of the wire stripper, as well as means for adjusting the cutting depth of the cutting jaws; Fig. 28 a further perspective view according to Figure 27Fig. 29 in perspective view the adjustment device arrangement for setting a cutting depth of the cutting jaws; Fig. 30 the adjustment device arrangement in side view; Fig. 31 in a side view an eccentric part of the adjustment device arrangement with a first and a second eccentric; Fig. 32 the arrangement according to Figure 31 in perspective view; Fig. 33 the section along line XXXIII-XXXIII in Figure 31 through the area of ​​the first eccentric; Fig. 34 the section according to line XXXIV-XXXIV in Figure 31 through the area of ​​the second eccentric; Fig. 35 a schematic sectional view of area XXXV in Figure 7; Fig. 36 one of the Figure 35 corresponding representation, however, after a manual adjustment of the cutting depth via the adjustment means arrangement.

[0027] The presentation and description initially refers to Figure 1, a wire stripper 1 with two jaws 2, 3 and two handles 4, 5. The jaws 2 and 3 define a jaw opening M.

[0028] The jaw of the pliers 2, which is referred to below as fixed, is directly and firmly connected to the handle part 4 via a cheek area 6.

[0029] In the cheek area 6, the wire stripper 1 provides a bearing for a rotary axis 7 with a geometric axis x, about which the jaw 3, which is movable further below, is rotatably mounted.

[0030] The bearing of the movable jaw 3 on the axis of rotation 7 results in the area of ​​a shoulder area 8 of the movable jaw 3 extending in the direction of extension of the axis x in projection to the cheek area 6 of the stationary jaw 3.

[0031] The jaw opening position, for example as shown in Figure 6, is stop-limited, due to the support of a projection area 9 on the movable jaw 3 on an associated support surface 10 of the stationary jaw 2.

[0032] The further handle part 5 is pivotally mounted about a further geometric axis y, which is aligned parallel to the axis of rotation 7 or its geometric axis x. The corresponding physical axis is likewise held in the cheek area 6 of the fixed jaw 2 or the fixed handle part 4.

[0033] The movable handle part 5 is pivotable about the axis y in the direction of the fixed handle part 4, wherein a pivoting displacement of the movable handle part 5 in the direction of the fixed handle part 4 causes a coupled rotational movement of the movable jaw 3 about the axis x.

[0034] For this purpose, a preferably angled control lever 11 is attached to the movable handle part 5, the free end of which, in the illustrated embodiment with a roller 12 preferably arranged in this area, acts on an, for example, cam-like arm 13 of the shoulder area 8 of the movable jaw of the pliers 3.

[0035] The control lever 11 is pivotally mounted on the movable handle part 5. The pivot axis for this movement preferably runs parallel to the geometric axis of rotation x.

[0036] A return spring 14, preferably in the form of a torsion spring, acts between the control lever 11 and the movable handle part 5. This spring biases the movable handle part 5 in the direction of the Figure 6 The basic position shown.

[0037] In this basic position, a projection area 15 extending away from the grip area with reference to the geometric axis y of the movable handle part 5 acts on the shoulder area 8 of the movable jaw 3 in such a way that it is forced and held in its stop-limited basic position.

[0038] Furthermore, the movable handle part 5 acts via a linkage 16 on a cutting edge 17 which is pivotally mounted in the cheek area 6 of the stationary jaw 2. The cutting edge 17 is mounted in the cheek area 6, with its geometric axis z also running parallel to the geometric axis of rotation x of the movable jaw 3.

[0039] The cutting edge 17 is exposed in a free-cut area 18 of the fixed jaw 3 or cheek area 6 and is preferably used for cutting a cable to length, for example a cable to be stripped in a further step.

[0040] By pivoting the cutting edge 17 during the pivoting displacement of the movable handle part 5 towards the stationary handle part 4, a cable that may be located in the area 18 is cut by the pivoting cutting edge 17, with the cable supported on the flanks of the cheek area 6, which limit the area 18.

[0041] The two jaws of the pliers 2 and 3 each have an outer clamping jaw 19, 20, for clamping a cable 21 inserted into the jaws of the pliers for stripping a free end, see also Figures 13 to 16 .

[0042] Furthermore, two inner cutting jaws 22, 23 are provided with respect to the arrangement of the clamping jaws 19 and 20 relative to the geometric axis of rotation x, each with cutting edges 24, 25 fixed in the end region facing the clamping jaws 19 and 20. The cutting edges 24 and 25 are arranged facing each other.

[0043] The cutting jaws 22 and 23, which are described in further detail in the following sections: Figures 2 to 5 The cutting jaws 22 and 23 are grouped together as a pair of cutting jaws 26 and are connected to each other in the area of ​​the ends facing away from the cutting edges 24 and 25 via a pivot axis 27, which pivot axis 27 allows a relative pivoting of the cutting jaws 22 and 23 to each other.

[0044] In the operational arrangement of the cutting jaw pair 26, the geometric axis of the pivot axis 27 preferably extends in parallel to the axis of rotation x of the movable jaw 3.

[0045] Between the cutting jaws 22 and 23 a spring 28, in the illustrated embodiment in the form of a cylindrical compression spring, is arranged, which spring 28 loads the cutting jaws 22 and 23 into an open position spaced apart from each other.

[0046] In the illustrated embodiment, a stop slide 29, which can be locked in the extension direction of the cutting jaw 22, is provided on the lower cutting jaw 23, i.e. on the cutting jaw 22 associated with the stationary jaw of the pliers, to provide a stop for the free end of the cable 21 inserted into the jaw of the pliers in order to define the length of the area to be stripped.

[0047] The cutting jaws 22 and 23 are guided laterally in their respective jaws 2 and 3, see also, for example, Figure 12 and 13 , to enable proper sliding displacement of the cutting jaws 22 and 23 in the direction of their longitudinal extension, i.e. starting from an initial position associated with the clamping jaws 19 and 20 in the direction of an end position spaced apart from the clamping jaws 19 and 20 and displaced in the direction of the axis of rotation x and from this end position back to the initial position.

[0048] A pull rod 30 is provided for this displacement of the cutting jaws 22, 23, preferably of the pair of cutting jaws 26 as a whole. The cutting jaws 22, 23 can be displaced from a starting position to an end position by compressing the handle parts 4, 5 against the force of a spring 39 acting on the pull rod 30. For this purpose, the pull rod 30 is preferably further penetrated by a pull axis 33 that is movable in, for example, an elongated hole 34. The pull rod 30 also preferably has a sliding element attached to it at its handle-side end. The sliding element can be displaceable relative to the pull rod 30 against the force of the spring 39, in order to release the pull rod 30 from a handle-side bearing.

[0049] The sliding part can in particular be designed as a sleeve 35.

[0050] When the pull rod 30 is released from its handle-side bearing, it can pivot about the pull axis 33. By pivoting accordingly, the cutting jaws 22, 23 are released from the pull rod 30.

[0051] The drawbar 30 is also guided through the physical axis of rotation 7 by means of a drawbar-side, elongated hole-like recess 31.

[0052] Associated with the pivot axis 27 of the cutting jaw pair 26, the drawbar 30 has an entry opening 32 that is directed essentially towards the stationary jaw 2 and, furthermore, essentially in the closing and opening direction of the cutting jaws 22 and 23. This opening is created by an overall hook-like design of the corresponding end region of the drawbar 30.

[0053] In this entry opening 32, the pivot axis 27 of the cutting jaw pair 26 is located in the usual operating position of the wire stripper 1, so that a sliding displacement of the pull rod 30 made possible by the elongated design of the recess 31 leads to a corresponding sliding displacement of the cutting jaw pair 26.

[0054] This sliding displacement of the drawbar 30 is enabled by a coupling with the control lever 11, which is mounted on the movable handle part 5. The control lever 11 engages in a slot 34 on the drawbar side with a pull axis 33 aligned parallel to the axis of rotation 7, which in the illustrated embodiment can also form the axis for the roller 12. A central longitudinal line of the slot 34 forms an acute angle α of approximately 60 to 85°, or for example approximately 75°, with a displacement direction r of the drawbar 30.

[0055] A section of the pull rod 30 which is bent in relation to the area which is guided in particular in the area of ​​the pivot axis 7 and the pull axis 33 runs in the usual operating position of the wire stripper 1 possibly within the fixed handle part 4, in any case in association with it.

[0056] At the end closest to the handle, the pull rod 30 is enclosed by the aforementioned sleeve 35. This sleeve is preferably captive and held in place on the pull rod 30, while allowing the sleeve 35 to slide relative to the pull rod 30. This is made possible by a pin-shaped retaining element 36 that penetrates the cross-section of the sleeve, with the pin-shaped retaining element 36 being fixed at each end in the region of the sleeve wall 37. The pin-shaped retaining element 36 penetrates the pull rod 30, which is received at the end of the sleeve 35, in the region of a further elongated hole 38.

[0057] Inside the sleeve 35, the spring 39 is arranged in the form of a cylindrical compression spring, which is supported at one end on the base 40 of the sleeve 35 and at the other end on a shoulder 41 of the drawbar 30 facing the base 40. Accordingly, a relative displacement of the drawbar 30 and the sleeve 35 in the direction of the longitudinal axis of the sleeve against the force of the spring 39 is enabled.

[0058] In the illustrated embodiment, the sleeve 35, together with the associated end region of the pull rod 30, is received in a recess 42 on the inside of the handle, wherein the sleeve 35, in the ready-to-use state of the wire stripper 1, can be supported on a recess bottom 43 by means of a pin-shaped extension projecting beyond the bottom 40.

[0059] Furthermore, the sleeve 35 has a detent projection 44 for engagement with a detent recess 45 formed on the handle part 4, in particular in the area of ​​the cavity 42.

[0060] According to the arrangement and design of the spring-loaded sleeve 35 described above, the pull rod 30 can be released from the handle-side bearing (compare Figure 10 As already explained above, the drawbar 30 can be pivoted about the axis of rotation 7, which is also made possible by the pull axis 33 guided in the elongated hole 34 of the drawbar 30. As a result of this pivoting movement of the drawbar 30 towards the movable handle 5, the free end of the drawbar 30, which has the insertion opening 32, pivots open, releasing the pivot axis 27 of the cutting jaw pair 26. In addition, a linear movement, guided by the axis of rotation 7 engaging in the elongated recess 31, may optionally occur superimposed on the pivoting movement of the drawbar 30. In this movement, the control lever 11, which is dragged along by the pull axis 33, pivots against the force of the return spring 14.

[0061] In the pivoted and, if necessary, sliding position of the drawbar 30 as shown in the illustration in Figure 10 The cutting jaw pair 26 can be removed in a handling-friendly manner, preferably by performing a pivoting movement of the cutting jaws 22 and 23 in the direction of a closing position against the spring 28 which loads the cutting jaws 22 and 23.

[0062] After reinserting a pair of cutting jaws 26, the proper operating position of the wire stripper 1 can be assumed in a handling-friendly and tool-free manner.

[0063] The cutting jaws 22 and 23 are in the direction of a closing position, contrary to the direction of the cutting jaws 22 and 23 in a position for example in Figure 6 The open position shown is such that the load-bearing spring 28 can be moved towards each other when the handle legs 4 and 5 are brought together.

[0064] The cutting jaws 22 and 23 are further removed as a pair for replacement. In more detail, the cutting jaws 23 and 23 are pivotally connected to each other via a pivot axis 27, which is preferably also designed as an axle pin.

[0065] Each cutting jaw 22, 23 is supported in the associated pliers jaw 2, 3 via a cam section 46, 47, which cam section 46, 47 in turn is supported on a clamping jaw fixed cam 48, 49.

[0066] This indirect support of the cutting jaws 22, 23 on the respective pliers jaws 2, 3 is known from the aforementioned EP 1 557 920 B1. Reference is also made to the content of that patent specification regarding its mode of operation.

[0067] The sliding wedge-shaped cam section 46 or 47 is suitable for displacement along the cam section 48 or 49, which is designed as a sliding wedge surface on the jaw side. The radii of the interacting surfaces of cam section 46, 47 and cam section 48, 49 are matched to each other. Overall, the cam sections 46 and 47 are slidably displaceable, essentially in the displacement direction r of the drawbar 30 and the pair of cutting jaws 26.

[0068] The cam element 46 guided in the movable jaw 3 is preferably connected to the cheek area 6 of the stationary jaw 2 or the stationary handle element 4 via a connecting rod 50, this via a first axis 51 provided at the end of the connecting rod 50, which is guided in the cheek area 6 in a first elongated hole 52.

[0069] The cam element 47 guided in the stationary jaw 2 can also have a connecting rod 53 which can carry a second axle 54 at its end for engagement in a second elongated hole 55 provided in the shoulder area 8 of the movable jaw 3.

[0070] With reference to a basic position, for example according to the representation in Figure 6 are the elongated holes 52 (see also Figure 25 ) and 55 (see also Figure 27 ) with reference to a projection of the same in the direction of the geometric axis of rotation x into a plane perpendicular to the axis of rotation x such that they enclose an acute angle of approximately 45° to the direction of displacement r, with both elongated holes 52 and 55 being inclined essentially in the direction of the axis of rotation x.

[0071] As a result of the aforementioned arrangement of the cam parts 46 and 47 in conjunction with the jaw-side cams 48 and 49, as well as further as a result of the connection of the cam parts 46 and 47 via the connecting rods 50 and 53 to an area of ​​the substantially opposite jaw of the pliers, in the embodiment an automatic cutting depth adjustment is given depending on the cable outer diameter.

[0072] Depending on the diameter or thickness of the cable 21 to be gripped between the clamping jaws 19 and 20, different cutting depths of the cutting edges 24 and 25 of the cutting jaws 22 and 23 result when the handle parts 4 and 5 are compressed accordingly. This is because, depending on the gripping cable thickness and the associated spacing of the clamping jaws 19 and 20 and, consequently, the jaws 2 and 3, a sliding displacement of the cam sections 46 and 47 along the cams 48, 49 occurs. As a result, the support point for the cutting jaws 22 and 23 on the cam sections 46 and 47 changes. Depending on the cable thickness, the cam sections 46 and 47 are displaced to the same extent in or against the direction of displacement r via the connecting rods 50 and 53.

[0073] The cutting depth is adjusted by pressing together the handle parts 4 and 5, and above them the jaws 2 and 3, and the associated deflection of the movable jaw 3 about the axis of rotation 7. This causes the lower cam element 47 in the stationary jaw 2 to be slightly pulled away from the jaw tip via the connecting rod 53, which is connected to the movable jaw 3. This movement shifts the cam element 47 by a certain amount. This shift closes the associated cutting jaw 23 by a certain amount and simultaneously changes the angular position of the cam element 47.

[0074] Simultaneously, the movable jaw 3 is deflected via the cam section 46, which is connected to the stationary jaw 2 via the connecting rod 50, so that a relative movement of the cam section 46 with respect to the associated cam 48 occurs in the same direction as with the cam section 47. Thus, a feed movement of the associated cutting jaw 22 perpendicular to the longitudinal displacement and a positional correction of the cam section 46 also occur here.

[0075] During the compression of the handle parts 4 and 5, the jaws of the pliers M are initially closed by a corresponding pivoting movement of the movable jaw 3, superimposed on a closing action of the cutting jaw pair 26 (compare Figure 7The cutting edges 17 of the cutting jaws 22 and 23 cut into the insulation sheath of the cable 21, with a cutting depth that, according to the design described above, is automatically adjusted depending on the cable thickness.

[0076] The pivoting displacement of the movable jaw 3 is achieved by correspondingly acting on the roller 12 arranged on the control lever 11 on a control surface of the boom 13 facing the direction of movement, which in the basic position of the wire stripper 1 is approximately aligned in the direction of movement r.

[0077] With further pivoting of the movable handle part 5 towards the stationary handle part 4 as shown in the illustration in Figure 8The roller 12 of the boom 13 slides along the facing and previously described end face of the boom 13, overcoming the restoring force of the spring 39 acting on the drawbar 30 in the sleeve 35. The drawbar 30 is pulled linearly in the direction of displacement r, dragging along the pair of cutting jaws 26. This causes the insulation section 56, separated by cutting with the blades 17, to be stripped from the conductor.

[0078] According to the representation in Figure 9 When the handle parts 4 and 5 are further compressed, the roller 12 on the cantilever side leaves its supporting position relative to the cantilever 13 of the movable jaw 3, which pivots back towards its open-home position, simultaneously opening the jaw M of the pliers and the pair of cutting jaws 26. This is due, among other things, to the restoring force of the spring 28 provided between the cutting jaws 22 and 23.

[0079] The cable 31, with its end stripped, is freely accessible for removal from the wire stripper 1. The severed and removed insulation section 56 is freely accessible for removal or, if necessary, falls automatically from the jaws of the pliers M.

[0080] To enable adjustment of the automatic cutting depth adjustment of the cutting edges 24 and 25 of the cutting jaws 22 and 23, a central adjusting means can be provided. This can be, as exemplified in Figure 26 The figure shows a one-piece formed eccentric part 57 with two eccentrics 58 and 59 spaced apart from each other in the axial direction of the eccentric part 57. Further reference is made to the Figures 31 to 34 referred.

[0081] Furthermore, the eccentric part 57 can form the axis of rotation 7, as also shown, in particular by means of an eccentric part area formed between the eccentrics 58 and 59, which is circular in cross-section and concentric.

[0082] The eccentric part 57, see also Figure 28The eccentric part 57 can be formed in a hollow shaft shape to allow passage through a central, solid shaft. This shaft can be further formed by a screw bolt 60, via which the eccentric part 57 can be rotatably mounted on the cheek area 6 of the stationary jaw 2. The screw bolt 60 is supported at its end by a collar on the cheek side. Opposite this collar in the axial direction, a screw connection is made to an externally accessible, plate-shaped handle 61, which engages with a square extension, as shown, in a correspondingly shaped coaxial recess 62 of the eccentric part 57 in a rotationally fixed manner. A rotational displacement of the handle 61 about the geometric axis of rotation x leads accordingly to a rotational displacement of the entire eccentric part 57. A detent rotational displacement may be present.

[0083] The second eccentric 59, which faces the central area of ​​the eccentric part 57 of the handle 61 forming the axis of rotation 7, can be larger in diameter overall, i.e. also with respect to the cam-like extension, than the section forming the axis of rotation 7, while the further first eccentric 58, which is formed further away from the handle 61, can be smaller in diameter than the central area forming the axis of rotation 7.

[0084] The eccentrics 58 and 59 act via first and second links 63, 64 on the first and second axles 51, 54 of the connecting rods 50, 53 respectively (see Figures 30 , 35 and 36 ).

[0085] The adjustment of the automatic cutting depth setting, which is still provided by this design, is carried out by turning the handle 61, which leads accordingly to a rotational displacement of the eccentrics 58 and 59 via the positive locking connection, and further accordingly to a displacement of the control areas 65, 66, which are eccentrically pre-curved in cross-section relative to the geometric axis of rotation x, by the respective angular amount.

[0086] As can be seen from the sectional views in the Figures 33 and 34 As can be seen, according to the illustrated embodiment, the control areas 65 and 66 of the eccentrics 58 and 59 can be arranged offset from each other by an angle β of approximately 90° with respect to the geometric axis of rotation x.

[0087] By rotating the handle 61 and the associated rotation of the eccentrics 58 and 59 about the geometric axis of rotation x, a uniform and unidirectional displacement of the first and second axes 51, 54 of both connecting rods 50 and 53 in the associated first and second elongated holes 52, 55 is achieved (see arrows c). Figure 36 is a position opposite to the one in Figure 35 The handle position is shown rotated by 180°. Accordingly, the control areas 65 and 66 of the eccentrics 58 and 59 are rotated into a position opposite to the geometric axis of rotation x, with corresponding dragging of the associated linkages 63 and 64. In one possible embodiment, the latter comprise the circumferential end face of the respective eccentric.

[0088] According to the example, the axes 51 and 54 are displaced by approximately half the extension of the respective elongated hole 52, 55 in the elongated hole 52, 55, with corresponding dragging of the connecting rods 50 and 53 attached to the axes 51 and 54 as well as the final cam parts 46 and 47.

[0089] In the case of such an adjustment means arrangement, the angular position of the cam parts 46 and 47 and their relative position to the respective cam 48, 49 with respect to the basic orientation in the jaw open position can be adjusted via the handle 61 and correspondingly via the eccentrics 58 and 59, from which basic position a further automatic adjustment to the cable thickness can be made during the usual use of the wire stripper 1.

[0090] According to the descriptions in the Figures 35 and 36An exemplary adjustment of the eccentrics 58 and 59 by 180° to adjust the automatic cutting depth setting can increase the opening of the cutting jaws 22 and 23 shown in these illustrations with respect to an opening angle γ by a quarter to an eighth, and further, for example, by about a sixth of the angle dimension.

[0091] The relative arrangement of the first and second axes 51, 54 in the associated elongated holes 52 and 55 is independent of a pivoting position of the clamping jaws 19, 20 or the pliers jaws 2 and 3.

[0092] The wire stripper 1 can be equipped with clamping jaws 19 and 20 and / or cutting edges 17 as described below.

[0093] The cutting edges 24, 25 of the cutting jaws 22, 23 can be fixed by means of screws 67 which can be operated from the front of the respective cutting jaw 22 or 23.

[0094] For this purpose, each cutting edge 24, 25, which is at least essentially plate-shaped, can have a bore 68 through which the respective screw 67 can pass.

[0095] The cutting edge 24, 25 has a cutting tip 69 pointing towards the jaws M in the state of use, with a cross-section as shown in the illustrations in the Figures 21 and 22 end tapering at an acute angle, which in a side view according to Figure 23 a contour line 70 forms. In the side view according to Figure 23 The contour line 70 also forms a finishing line of the cutting edge 17.

[0096] The contour line 70 can have a depression 71. This depression appears in a central region viewed along the longitudinal extent of the contour line 70 as a continuously curved line (curved region 72), preferably a circle, with a radius a. A line or section 73 with a lesser curvature preferably adjoins this curve on both sides, continuing the enclosure of an inserted cable 21. According to the illustrated embodiment, this line adjoining the central curved line can be a straight line on both sides of the curvature, resulting in an overall essentially V-shaped depression 71 in the contour line 70, with a correspondingly rounded V-tip with radius a.

[0097] The contour line in section 73, which follows the rounded contour in area 72, can continue in the direction of the cutting direction b with respect to a cutting direction b of a cutting plane E (compare Figure 24). It increases accordingly in the exemplary embodiment and with reference to Fig. 29 Starting from the indentation in the cutting direction b, it rises upwards or falls downwards.

[0098] Limiting the depression 71, the contour line 70 preferably continues on both sides of the depression 71 into straight sections 73, 74, which can run according to a common straight line perpendicular to the cutting direction b.

[0099] The contour line 70 also extends in a plane extension of the strictly curved line, see Figures 3 and 11 - Cutting plane E continues, cf. Fig. 23 . The contour line 70 thus extends in width and height, preferably less so in height than in the area of ​​the rounded contour and more so in width than in the area of ​​the rounded contour.

[0100] Each clamping jaw 19 or 20 can, as shown, initially have a plate-shaped base body 75 with two opposing broad surfaces. A fastening extension 76 projects vertically from one broad surface when arranged approximately centrally. This fastening extension can be plate-shaped with a plate plane extending transversely to the orientation of a cable 21 to be gripped between the clamping jaws 19 and 20 when installed.

[0101] By means of the fastening extension 76, the clamping jaw 19 or 20 can be fastened to the associated pliers jaw 2 or 3, respectively, by inserting the fastening extension 76 into a correspondingly designed receiving pocket 77 of the pliers jaw 2, 3.

[0102] The clamping jaws 2, 3 are secured by a screw connection. The corresponding fastening screw 78 passes through a corresponding bore in the clamping jaws 2, 3 and an elongated hole 79 in the fastening extension 76, with the screw fastening of the clamping jaws 19, 20 being effected from an end face 80 of the respective clamping jaws 2, 3.

[0103] Both clamping jaws 19 and 20 are provided with ribs 81 extending transversely to a cable 21 to be clamped between the clamping jaws 19 and 20, with respect to the broad sides of the base bodies 75 which face each other in the installation situation. Groove-like recesses 82, each with a recess base 83, extend between these ribs 81.

[0104] According to the illustrated embodiment, and preferably, six such ribs 81 can be provided for each clamping jaw 19, 20, which are spaced evenly apart from each other when viewed transversely to the longitudinal extent of the ribs 81, see also Figure 18 Furthermore, the ribs 81 are arranged in such a way that, depending on the thickness of the cable 21 to be clamped, but also without inserting a cable 21, they can enter the recesses 82 of the opposite clamping jaw in a comb-like manner.

[0105] As shown, all ribs 81 of both clamping jaws 19 and 20 can have a concave bulge 84 along a portion of their longitudinal extent, preferably in the center of their longitudinal extent. This results, preferably when the recesses 84 are aligned along the longitudinal extent of an inserted cable and when viewed over all ribs 81, in a substantially central, trough-shaped depression – in the sense of an envelope surface over the contour lines of the bulges in the aforementioned longitudinal extent – ​​with respect to the rib surface 85 pointing towards the jaw opening M. Reference is also made to the Figures 19 and 20 referred.

[0106] The ribbed surface 85 on both sides of the protrusions 84 span a total flat clamping surface F.

[0107] The width d of a projection 84, considered in the direction of extension of a rib 81, can correspond approximately to half the longitudinal extent of the rib. The depth e of a projection 84, considered perpendicular to the width d, can correspond approximately to half the maximum depth f of a recess 82, considered in the same direction.

[0108] The maximum depth f of a recess 82 in the illustrated embodiment can also correspond to approximately 1.5 times the free distance g between two adjacent ribs 81 in the region of their rib surface 85, considered transversely to the rib longitudinal extent (compare Figure 17 ).

[0109] Furthermore, each rib 81, with respect to a cross-section perpendicular to the longitudinal extent of the rib 81, can taper conically from the recess base 83 towards the rib surface 85. Thus, the outer surfaces of the ribs, which define the recess 82, can form a cone angle δ of approximately 15° with respect to each other.

[0110] The rib surface 85 of each rib 81 can extend, with respect to a longitudinal extent of the rib 81, over a partial area in a plane defining the clamping surface F, for example according to the illustration in Figure 17 over a length h which may correspond to approximately one-third of the total length k projected onto the clamping surface F. The section of the rib surface 85 extending beyond the length h may, according to the embodiment shown in Figure 17, drop at an angle ε of approximately 5°.

[0111] The recess floor 83 can have different depths along the length of the recess 82, and thus different dimensions f. As also shown, a dome-shaped elevation 86 can be provided on the recess floor side in the area of ​​the bulge 84, with a width m, considered in the longitudinal extension of the recess 82, which can correspond to approximately one-third of the total length of the recess 82 or a rib 81, and a height n above the level of the area of ​​the recess floor 83 adjoining the elevation 86, which height n can correspond to approximately one-third to one-fifth of the greatest depth f of the recess 82.

[0112] The arrangement and dimensions of the bulge 84 and the elevation 86 can be further chosen such that even in the area of ​​the elevation 86 the bulge 84 does not reach the recess base 83. List of reference symbols

[0113] 1 Wire stripper 29 Stop slide 2 fixed jaw of pliers 30 pull rod 3 movable pliers jaw 31 Exclusion 4 fixed handle 32 Entrance opening 5 movable handle part 33 traction axis 6 cheek area 34 Slotted hole 7 axis of rotation 35 sleeve 8 shoulder area 36 Mounting part 9 Advantage area 37 sleeve wall 10 support surface 38 Slotted hole 11 control lever 39 Feather 12 role 40 Floor 13 boom 41 shoulder 14 Return spring 42 cavity 15 Advantage area 43 Cave floor 16 handlebars 44 Rast ledge 17 Cut 45 Rest recess 18 cleared area 46 Scenery piece 19 Clamping jaw 47 Scenery piece 20 Clamping jaw 48 backdrop 21 Cable 49 backdrop 22 Cutting jaw 50 Stabilizer link 23 Cutting jaw 51 first axis 24 Cut 52 first slot 25 Cut 53 Stabilizer link 26 Cutting jaw pair 54 second axis 27 Swivel axis 55 second elongated hole 28 Feather 56 Insulation section 57 Eccentric part 84 bulge 58 first eccentric 85 Rib surface 59 second eccentric 86 increase 60 Screw bolt 61 handling a radius 62 Exclusion b Cutting direction 63 first handlebar c Arrow 64 second handlebar d Width 65 Control area e depth 66 Control area f depth 67 screw g Distance 68 Drilling h length 69 Cutting tip k Total length 70 contour line m Width 71 depression n Height 72 curved area r Direction of movement 73 Section x geometric axis of rotation 74 Section y geometric axis 75 basic body z geometric axis 76 Mounting extension EM Cutting plane 77 Recording bag F Clamping surface 78 fastening screw Pincer jaw 79 Slotted hole α angle 80 Front surface β angle 81 rib γ Opening angle 82 Exclusion δ cone angle 83 Excavation floor ε angle

Claims

1. Stripping pliers (1) comprising two plier jaws (2, 3), two outer clamping jaws (19, 20), two inner cutting jaws (22, 23) and two grip parts (4, 5), wherein the cutting jaws (22, 23) are displaceable by means of a traction rod (30), in the course of squeezing together the grip parts (4, 5), from an initial position into an end position, wherein furthermore one plier jaw (2) is stationary and one plier jaw (3) is movable as a result of a rotational movement relative to the stationary plier jaw (2), wherein furthermore the cutting jaws (22, 23), in their direction of displacement (r), are guided on two cam parts (46, 47) which are movable in the direction of displacement (r), namely on a first cam part (46) acting on the cutting jaw (22) associated with the movable plier jaw (3) and on a second cam part (47) acting on the cutting jaw (23) associated with the stationary plier jaw (2), which cam parts in turn are supported on a respectively associated clamping-jaw-fixed cam track (48, 49), by means of which cam parts (46, 47) the cutting jaws (22, 23), in dependence on a closed position of the clamping jaws (19, 20), which closed position determines the movement of the cam parts (46, 47), are moved towards one another to different extents, wherein furthermore an automatic adaptation of a cutting depth is enabled by a relative displacement of a cam part (46, 47), on which the associated cutting jaw (22, 23) is supported, relative to the associated cam track (48, 49), wherein furthermore the first cam part (46) associated with the movable plier jaw (3) is mounted in the stationary plier jaw (2) via a first shaft (51) guided in a first elongated hole (52), characterised in that the cam parts (46, 47) are additionally manually adjustable, independently of a closed position of the clamping jaws (19, 20), with respect to a position relative to the cam track (48, 49), with the same action on both cam parts (46, 47), in that the second cam part (47) associated with the stationary plier jaw (2) is mounted in the movable plier jaw (3) via a second shaft (54) guided in a second elongated hole (55), in that, to enable an adjustment of the automatic cutting-depth adaptation of the cutting edges (24, 25) of the cutting jaws (22, 23), a central adjusting means is provided, in that the adjusting means is a one-piece eccentric part (57) having two eccentrics, namely a first eccentric (58) and a second eccentric (59), which are spaced apart from one another in the axial direction of the eccentric part (57), in that the first and the second eccentric (58, 59) are formed with a common axis of rotation (x), and in that, for indirect interaction of the eccentrics (58, 59) with the cam parts (46, 47), the first and the second eccentric (58, 59) are connected to the first and second shaft (51, 54), respectively, by means of a first (63) and a second link member (64).

Images