Wire stripping pliers with two plier jaws

Abstract

The present invention relates to a wire stripping pliers (1) comprising two pliers jaws (2, 3), two outer clamp jaws (19, 20), two inner cutting jaws (22, 23), and two handles (4, 5). The cutting jaws (22, 23) are movable from a starting position to an ending position during the process of gripping the handles (4, 5), and each cutting jaw (22, 23) has a blade (24, 25) with cutting blades (32, 33), and the cutting blades (32, 33) are separated by a predetermined distance (a) from each other at a predetermined position when the cutting jaws (22, 23) are close to each other, and at a position considered to be the base position, the distance (a) is adjustable by an adjustment screw (38). To further improve the design of the wire stripping pliers of the type in question, it is proposed that the adjustment screw (38) may be connected to an adjustment wheel (45) that is alignable with a mark (46) fixed to one of the pliers jaws (2, 3) in the base position.

Description

Technical Field

[0001] The present invention relates to a wire stripping plier having two plier jaws, two outer clamping jaws, two inner cutting jaws, and two handle portions. The cutting jaws are movable from a starting position to an ending position during the process of gripping the handle portions. Each of the cutting jaws has a blade provided with a cutting edge, and the cutting edges are separated from each other by a predetermined distance at a predetermined position where the cutting jaws approach each other. The distance is adjustable via an adjustment screw at a position regarded as a basic position.

Background Art

[0002] The type of wire stripping plier in question is known. These are used for stripping the coating of an electric cable. In this field, so-called automatic wire stripping pliers are known. This plier cuts the insulator in one operation, and then, by further gripping the handle portion, at least partially peels the insulator from the conductor. To expose the conductor without damage, it is usually necessary to adjust the cutting depth of the cutting jaws according to the thickness of the insulating layer.

[0003] This type of wire stripping plier is described, for example, in Patent Document 1. This wire stripping plier is provided with an adjustment screw, and by acting on a lever supporting one of the two cutting jaws with this adjustment screw, the relative distance between the cutting edges can be adjusted. This type of wire stripping plier is also known, for example, from Patent Document 2, and this stripping plier has an adjustment screw that can act directly on one cutting jaw to adjust the distance between the cutting edges. This adjustment screw can be fixed in 90° increments when viewed from the rotation direction of the adjustment screw.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] In view of the prior art described above, the present invention aims to further improve the design of this type of wire stripping pliers, which has been a subject of concern. [Means for solving the problem]

[0006] According to the first subject matter of the present invention, one possible solution is provided in wire stripping pliers in which an adjustment screw is connectable to an adjustment wheel, and the adjustment wheel is configured to align with a mark fixed to one of the pliers jaws in a basic position.

[0007] From the basic position set by the adjustment screw, the user can make (further) adjustments to the cutting blade distance using the adjustment wheel. For this purpose, preferably, the adjustment screw is initially set to a basic position, and the adjustment wheel is provided only afterward. Preferably, the user can make further (fine) adjustments to the cutting blade distance from the basic position using only this adjustment wheel, without the use of any tools.

[0008] For this purpose, the adjustment wheel may be provided with an easy-to-handle part, such as a knurled rim.

[0009] Preferably, the basic position is set using only an adjustment screw. In a preferred embodiment, an adjustment wheel is provided on the adjustment screw only after this basic position of the cutting jaw has been determined, allowing for further adjustment of the distance from the basic position.

[0010] The adjustment wheel allows users to easily find the basic setting again, even after making further distance adjustments. To this end, marks are provided on the fixing parts of the wire stripping pliers, such as the pliers jaws that house the adjustment screw, allowing the user to align the counter mark on the adjustment wheel with these marks.

[0011] Such wire stripping pliers typically have a conductor cross-sectional area (e.g., 0.75 mm²). 2 , 1mm 2 , 1.5mm 2 , 2.5mm 2 , 4mm 2 or 10mm 2 This is used for stripping the insulation from different types of electrical cables. Depending on the distance between the outer clamp jaws when gripping the cable to be stripped, the cutting depth of the cutting blade, which is matched to the conductor cross-sectional area, is automatically set, and therefore the minimum possible distance of the cutting blade. Thus, in known methods, the cutting blade distance is automatically adjusted in relation to the outer cross-sectional area of ​​the entire cable.

[0012] However, especially with cables of small cross-sectional area, readjustment of the cutting depth or cutting blade distance may be necessary. In particular, adverse temperature effects can cause damage to the exposed conductor without such adjustments.

[0013] According to one possible embodiment, the position of the adjustment wheel relative to the adjustment screw can be fixed in an immutable manner. For example, it can be made immutable by the manufacturer. This can be achieved by press-fit and / or active engagement connection between the adjustment wheel and the adjustment screw after basic alignment has been performed using the adjustment screw.

[0014] For example, fastening can be achieved by a locking screw that penetrates the adjustment wheel and is received by the threads of the adjustment screw. The locking screw can be self-locking to ensure that the adjustment wheel and the adjustment screw are fixed to each other. For this purpose, the locking screw may be bonded to the receiving threads.

[0015] Alternatively, or in combination with fastening by a locking screw, fastening can also be achieved by active engagement of the adjustment screw with the adjustment wheel. For this purpose, the adjustment screw may have, for example, a drive hole, which can serve to temporarily receive a tool, for example, that is correspondingly designed to adjust the base position. Such a receiving portion may have, for example, a polygonal cross-section to receive a polygonal tool, or it may have a polygonal cross-section to receive a polygonal drive projection of the adjustment wheel after the base position and alignment of the adjustment wheel have been adjusted.

[0016] The adjustment wheel can interact with a detent device fixed to the pliers jaws. Such a detent device is typically overcome by the user during the process of operating the adjustment wheel when initiating its rotation.

[0017] The detent device can be operated, for example, independently or at least in the basic position of the adjustment wheel. It also provides a tactile signal to the user as soon as the basic position is reached.

[0018] In one embodiment, the detent device may have a protruding, spring-loaded detent projection. The detent projection may be formed on a separate spring component that can be fixed to the corresponding pliers jaws in order to interact with the adjustment wheel. Such a spring component may be a plastic injection-molded part having a flexible elastic portion for forming the detent projection.

[0019] Multiple detent recesses can be formed on the adjustment wheel in the direction of rotation. These can preferably be arranged at equal angular intervals from each other in the direction of rotation. Furthermore, the distance between two consecutive detent recesses in the direction of rotation can be an angle of, for example, 5° to 45°, such as approximately 10°, 15°, or 30°.

[0020] The detent recesses can be formed at different height levels in the rotational direction. Thus, when viewed in the direction of the axis of rotation, starting from the basic position, in one rotational direction of the adjustment wheel, the height level of the subsequent detent recesses can increase continuously, and in the opposite rotational direction, the height level of the subsequent detent recesses in this direction can decrease continuously. The height level is defined by the distance between the bottom surface of the detent recess and a plane crossing the axis of rotation when viewed in the direction of the axis of rotation.

[0021] The increase or decrease in the height level can be accompanied by an increase or decrease in the spring force of the detent device to be overcome. Starting from the basic position, when rotating, for example, in the plus direction, the cutting edge distance can increase with a decrease in the height level of the corresponding detent recess and a corresponding decrease in the spring force of the detent device. When rotating, for example, in the minus direction in the opposite direction, the cutting edge distance can decrease. The resulting decrease in the height level of the detent recess and the associated increase in the spring force of the detent device give the user performing the operation a tactile signal that a significant decrease in the cutting edge distance that could damage the exposed conductor is occurring.

[0022] The rotatability of the adjustment wheel can be limited to a predetermined angular range. Preferably, a more favorable basic alignment is located at the center of the possible rotational angle range.

[0023] In a preferred embodiment, the rotational angle range is less than 360°. Thus, for example, a rotational angle range of 90° or more, and further, for example, up to 180° or 270° can be provided. Additionally, for example, a rotational angle range of about 210° or 225° can also be provided.

[0024] Over the limited rotational angle range, more than 10, for example, more than 20, and further, for example, 15 detent recesses can be provided, and preferably, they can be provided evenly spaced from each other.

[0025] Limitation of rotation can be achieved by active engagement between the adjustment wheel and the associated pliers jaws, and further by projections formed on the underside of the adjustment wheel that engage with length-limited grooves in the pliers jaws.

[0026] Alternatively, a detent recess can be formed, for example, on the jaws of pliers, and a spring-loaded detent projection that interacts with it can be provided on the adjustment wheel. To limit rotation, a projection can also be formed on the jaws of the pliers, and this projection can engage with a length-limited groove on the adjustment wheel.

[0027] The adjustment screw may act directly on the cutting jaws involved. Alternatively, only indirect action may be provided, for example, by designing the machine so that one or both cutting jaws can be acted upon externally by a sliding shoe in the direction of their movement toward each other.

[0028] In such a design, the adjustment screw may act indirectly on the cutting jaws involved via the slide shoe.

[0029] The ranges or values ​​specified above or below include, with respect to the disclosure, all intermediate values ​​in particular one-tenth of each dimension, and optionally dimensionless values. For example, the specification 90–270° also includes disclosures such as 90.1–270°, 90–269.9°, and 90.1–269.9°. The disclosures herein are used, on the one hand, to limit the boundaries of the described ranges from below and / or above, and on the other hand, or in addition to that, to clarify one or more singular values ​​from each described range. [Brief explanation of the drawing]

[0030] The present invention will be described below with reference to the accompanying drawings, which represent only one exemplary embodiment. [Figure 1] Figure 1 is a perspective view of wire stripping pliers with respect to the closed position of the pliers jaws. [Figure 2]Figure 2 is a longitudinal cross-sectional view along line II-II in Figure 1, relating to the opening position of the pliers jaws. [Figure 3] Figure 3 is a bottom perspective view of the wire stripping pliers, with an exploded perspective view of the adjustment device. [Figure 4] Figure 4 is a cross-sectional perspective view passing through section IV of Figure 3. [Figure 5] Figure 5 is a cross-sectional view of Figure 4 after the adjustment screw has been inserted and its basic position has been set. [Figure 6] Figure 6 is a diagram that follows arrow VI in Figure 5. [Figure 7] Figure 7 is a cross-sectional view corresponding to Figure 5 after the adjustment wheel has been positioned. [Figure 8] Figure 8 is a diagram that follows arrow VIII in Figure 7. [Figure 9] Figure 9 is a cross-sectional view of Figure 7, showing a large-area cable sandwiched between the clamp jaws. [Figure 10] Figure 10 is a diagram corresponding to Figure 2, showing the cable stripping process in progress as described in Figure 9. [Figure 11] Figure 11 is a diagram showing the result after the completion of the coating removal work, following Figure 10. [Figure 12] Figure 12 is a diagram corresponding to Figure 9, showing a small cross-sectional area cable being sandwiched. [Figure 13] Figure 13 is a diagram corresponding to Figure 2, showing the cable stripping process as described in Figure 12. [Figure 14] Figure 14 is a diagram showing the result after the completion of the coating removal work, following Figure 13. [Figure 15] Figure 15 is a perspective view of the adjustment wheel. [Figure 16] Figure 16 shows the adjustment wheel along arrow XVI in Figure 15. [Figure 17] Figure 17 is a plan view of the adjustment wheel along arrow XVII in Figure 16. [Figure 18] Figure 18 is a bottom view of the adjustment wheel along arrow XVIII in Figure 16. [Figure 19]Figure 19 is a cross-sectional view along line XIX-XIX in Figure 17. [Figure 20] Figure 20 is an enlarged view of the XX region in Figure 19. [Figure 21] Figure 21 is an enlarged cross-sectional view along line XXI-XXI in Figure 17. [Figure 22] Figure 22 is an enlarged view of region XXII in Figure 19. [Figure 23] Figure 23 is a perspective view of the adjustment screw. [Figure 24] Figure 24 is a side view of the adjustment screw. [Figure 25] Figure 25 is a perspective view of a single detent device equipped with a detent projection. [Figure 26] Figure 26 is a side view of the detent device along arrow XXVI in Figure 25. [Figure 27] Figure 27 is a diagram that follows arrow XXVII in Figure 26. [Modes for carrying out the invention]

[0031] First, with reference to Figure 1, a wire stripping pliers 1 equipped with two plier jaws 2 and 3 and two handles 4 and 5 will be shown and explained. The plier jaws 2 and 3 define the plier jaws ZM.

[0032] The pliers jaws 2 (hereinafter referred to as "fixed pliers jaws") are directly and firmly connected to the handle portion 4 via the cheek portion 6.

[0033] The wire stripping pliers 1 are equipped with a bearing for a pivot axis 7 having a geometric axis x at the cheek portion 6, and the pliers jaws 3 (hereinafter referred to as "movable pliers jaws") are rotatably mounted around this pivot axis 7.

[0034] The movable pliers jaw 3 is attached to the pivot axis 7 by being located in the shoulder region 8 of the movable pliers jaw 3, which extends in the direction of axis x at the portion of the fixed pliers jaw 2 that protrudes to the cheek region 6.

[0035] For example, the open position of the pliers jaws, as shown in Figure 2, is stopped and limited by the fact that the protruding region 9 of the movable pliers jaws 3 is supported by the support surface 10 to which the fixed pliers jaws 2 relate.

[0036] Another handle portion 5 is mounted around another geometric axis y, which is parallel to the pivot axis 7 or its geometric axis x. The physical axis in question is similarly held in the cheek region 6 of the fixed pliers jaws 2 or the fixed handle portion 4.

[0037] The movable handle section 5 can pivot around axis y towards the fixed handle section 4. As the movable handle section 5 pivots toward the fixed handle section 4, the movable pliers jaws 3 rotate in conjunction around axis x.

[0038] For this purpose, the control lever 11 is fixed to the movable handle portion 5, and its free end indirectly acts on the cantilever 13 of the shoulder region 8 of the movable pliers jaw 3.

[0039] The control lever 11 is rotatably held on the movable handle portion 5. Its related pivot axis preferably extends parallel to the geometric pivot axis x.

[0040] Preferably, a return spring 14 in the shape of a leg spring acts between the control lever 11 and the movable handle portion 5. This biases the movable handle portion 5 toward the basic position of the wire stripping pliers shown in Figure 2.

[0041] Furthermore, the movable handle portion 5 acts on the blade 17, which is pivotably mounted to the cheek area 6 of the fixed pliers jaw 2 via the link 16. The blade 17 is mounted to the cheek area 6. The relevant geometric axis z also extends parallel to the geometric pivot axis x of the movable pliers jaw 3.

[0042] The blade 17 is exposed to the cutting area 18 of the fixed pliers jaws 2 or the cheek area 6, and is preferably used to cut a cable to a predetermined length, such as a cable whose insulation will be stripped in the next step.

[0043] The blade 17 can interact with the fixed counter blade 15 which is fixed to the pliers jaw 3.

[0044] As the movable handle portion 5 rotates toward the fixed handle portion 4, the rotating movement of the blade 17 causes any cables present in region 18 to be cut by the rotating blade 17 while being supported by the side of the cheek region 6 defining region 18 and / or in contact with the counterblade 15.

[0045] The two plier jaws 2 and 3 each have outer clamp jaws 19 and 20 for gripping the free end of the cable 21 inserted into the plier jaw ZM for stripping the insulation. See Figures 9-14.

[0046] Furthermore, corresponding to the arrangement of the clamp jaws 19 and 20 with respect to the geometric pivot axis x, two inner cutting jaws 22 and 23 are provided, each equipped with blades 24 and 25 fixed to the end regions facing the clamp jaws 19 and 20. The blades 24 and 25 are arranged so that their cutting edges 32 and 33 face each other.

[0047] The cutting jaws 22 and 23 are combined as a pair of cutting jaws 26 and are connected to each other by a pivot axis 27 at the ends opposite to the blades 24 and 25.

[0048] In the operating mechanism of the pair of cutting jaws 26, the geometric axis of the pivot axis 27 preferably extends parallel to the pivot axis x of the movable pliers jaw 3.

[0049] For example, a spring 28 in the form of a cylindrical compression spring is positioned between the cutting jaws 22 and 23, and the spring 28 biases the cutting jaws 22 and 23 to the open position separated from each other as shown in Figure 2.

[0050] In the illustrated embodiment, a stop carriage 29, which can be locked in a predetermined position in the extending direction of the cutting jaws 22, is provided on the lower cutting jaws 22, thereby providing a stopper for the free end of the cable 21 inserted into the pliers jaws ZM. This allows for a reproducible definition of the length of the area to be stripped.

[0051] The cutting jaws 22 and 23 are guided laterally within their respective plier jaws 2 and 3, enabling their proper sliding movement in the longitudinal direction, that is, starting from a position spaced apart from the clamp jaws 19 and 20, moving to an end position toward the pivot axis x, and then returning from this end position to the starting position.

[0052] A pull rod 30 is provided for the movement of the cutting jaws 22 and 23, preferably the pair of cutting jaws 26 as a whole.

[0053] The control lever 11 has its free end articulated to the end region of the pull rod 30, and the rotational movement of the movable handle portion 5 acts on the pull rod 30, thereby acting on the pair of cutting jaws 26.

[0054] The pull rod 30 is supported on the bridge portion 31 of the movable pliers jaw cantilever 13 (initially in substantially the basic position of the wire stripping pliers 1). This allows the cutting jaws 22 and 23 to move from the starting position to the ending position as the handle portions 4 and 5 are gripped against the force of the return spring 14.

[0055] The upper cutting jaw 23 is in contact with the opposing sliding surface 33 of the movable pliers jaw 3, and while moving via the pull rod 30, the cutting jaw 23 can slide along its sliding surface 33 while being supported.

[0056] The lower cutting jaw 22 also has opposing sliding surfaces 34, but it does not directly contact the opposing fixed pliers jaw 2, but rather abuts against a slide shoe 36 provided for this purpose. The slide shoe 36 is attached to the fixed pliers jaw 2 so as to be rotatable around an axis 37 parallel to the pivot axis x.

[0057] The slide shoe 36 is supported on the fixed pliers jaws 2 by an adjustment screw 38. The adjustment screw 38 is held on the fixed pliers jaws 2 by an external thread 39 that engages with a threaded hole 40 in the fixed pliers jaws 2.

[0058] The adjustment screw 38 has a dome-shaped support portion 41 facing the slide shoe 36. On the opposite side of the support portion 41, the adjustment screw 38 is provided with a drive hole 42, which is, for example, a polygonal hole, when viewed in the direction of the rotation axis t of the adjustment screw 38.

[0059] The drive hole 42 is suitable for receiving a correspondingly designed tool 52, which allows the pair of cutting jaws 26 to be initially set by moving the adjustment screw 38 along its axis of rotation t.

[0060] Therefore, a basic position relating to the distance between the cutting edges 32 and 33 of the blades 24 and 25 can be set, for example by the manufacturer, and optionally by the user during normal use. This basic position can be the position of the wire stripping pliers 1 such that the clamp jaws 19 and 20 are in contact with each other, as shown in Figure 5, for example.

[0061] From this set base position, reliable and proper stripping of the insulation from cables 21 of different diameters can be performed according to the predetermined working range of the wire stripping pliers 1, without damaging the stranded wires 44 that would be exposed by cutting or incising the insulation sheath 43.

[0062] The adjustment screw 38 can be connected to the adjustment wheel 45, and if necessary, in undesirable conditions such as unfavorable weather or small diameter cables, the adjustment screw 38 can be readjusted from its base position via the adjustment wheel 45.

[0063] The adjustment wheel 45 can be inserted into an open-edged recess 48 formed in the fixed pliers jaws 2. Preferably, this is done in the process of aligning the adjustment wheel 45 with a mark 46 on the fixed pliers jaws 2 that indicates the base position. For this purpose, the adjustment wheel 45 has a counter mark 47 on its upper surface opposite to the adjustment screw 38.

[0064] The adjustment wheel 45 can be gripped and rotated in the region of the recess 48 that opens on the side of the pliers jaws. A knurled surface 49, for example, can be provided on the edge of the adjustment wheel 45 to improve operability.

[0065] The adjustment wheel 45 can be fixed to the adjustment screw 38. For this purpose, an active engagement can be provided. For active engagement with the drive hole of the adjustment screw 38, the adjustment wheel 45 has a drive projection 51 on its lower surface 50 facing the adjustment screw 38, through which a rotation axis t passes.

[0066] In the process of establishing active engagement by positioning the adjustment wheel 45 on the adjustment screw 38, it is preferable to align the counter mark 47 of the adjustment wheel 45 with the mark 46.

[0067] Active engagement is ultimately secured by the locking screw 53. The locking screw 53 passes through the central hole 55 of the adjustment wheel 45 and engages with the threads 54 of the adjustment screw 38 (see Figure 7). It may be a screw with self-locking threads. Alternatively, an adhesive can be applied to the screw for further fastening.

[0068] The rotatability of the adjustment wheel 45 and the adjustment screw 38 actively connected thereto by the adjustment wheel 45 is limited to a predetermined rotation angle range α, for example, about 190 to 200°, in the normal operating position of the wire stripping pliers 1. For this purpose, the adjustment wheel 45 has a projection 56 on its lower surface 50, which can engage with a length-limited groove 57 on the opposing surface of the fixed pliers jaws 2 (see Figures 7 and 8).

[0069] For example, starting from the basic position shown in Figure 8, the adjustment device E, formed by the adjustment wheel 45 and the adjustment screw 38, can be rotated in both directions to their respective rotation stoppers, and thus can be rotated, for example, by about 100° in each direction. Furthermore, as shown in the figure, additional marks 58 and 59 indicating the positive rotation direction P and the negative rotation direction M can be provided on the upper surface next to the counter mark 47. These marks are to indicate to the user, for example, that when the adjustment device E is rotated in the "minus" direction from the basic position, the distance a between the cutting blades 32 and 33 decreases (further), and when the adjustment device E is rotated in the "plus" direction, this distance a increases (further).

[0070] By rotating the adjustment device E from its basic position, the adjustment screw 38 is linearly moved along its axis of rotation by a range of 1 / 100th of a millimeter to a few tenths of a millimeter, thereby achieving a change in the preferred cutting blade distance a. Such linear movement of the adjustment screw 38 is accompanied by a corresponding angular alignment of the slide shoe 36, as the slide shoe 36 is supported on the adjustment screw 38, and therefore also by a corresponding orientation of the sliding surface 35 of the lower cutting jaw 22.

[0071] The adjustment wheel 45 and, therefore the entire adjustment device E can be detented at multiple circumferential positions, particularly at the basic position where the jaw-side mark 46 and the counter mark 47 of the adjustment wheel 45 coincide.

[0072] A detent device 60 can be provided that interacts with the adjustment wheel 45 at different rotational angle positions. The detent device 60 can be a plastic element comprising a base 61 and a detent projection 62 attached to the base 61. The detent projection 62 is set to be substantially aligned with the rotation axis t of the adjustment device E and to be elastically flexible.

[0073] In the region of the recess 48 of the fixed pliers jaw 2, the detent device 60, which is received and held in the recess 63 provided on the bottom surface, can be made as an injection-molded product of elastically restoring plastic.

[0074] The detent projection 62 of the detent device 60 interacts with the detent recess 64 formed on the lower surface 50 of the adjustment wheel 45. As shown in Figures 15 and 17, the adjustment wheel 45 may have 15 detent recesses 74 that are evenly spaced from each other in the circumferential direction, with the central detent recess 64' in the circumferential direction being allocated to align the adjustment wheel to its base position.

[0075] These detent recesses 64 are inherently and fundamentally identical in design, particularly with respect to the plan view in which the axis of rotation t appears as a point, and are also inherently and fundamentally identical in design with respect to the depth b between the recessed valley 66 and the recessed edge 65 surrounding it when viewed perpendicular to the extending plane of the plan view.

[0076] Furthermore, the detent recesses 64 are formed at different height levels relative to the position of their recess edges 65, with respect to the entire surrounding surface, the lower surface 50. When viewed in the direction of the rotation axis t, the distance c to each recess edge 65 is different with respect to the surface. As a result, when viewed in the circumferential direction, starting from the last detent recess 64, this distance c decreases continuously from one detent recess 64 to the next in the circumferential direction, and increases in the opposite circumferential direction. Therefore, starting from one end of the array of detent recesses and going to the other end, the distance c of the detent recesses 64 can be approximately doubled or halved, for example, from approximately 0.5 to 2 mm to approximately 1 to 4 mm.

[0077] In this case, preferably, the central detent recess 64' is substantially located at the level of the lower surface 50 of the surrounding surface with respect to its recess edge 65, and from there, the distance to the recess edge above the lower surface 50 increases as the distance c increases in the positive rotational direction P. Starting again from the central detent recess 64', the distance to the recess edge below the lower surface 50 increases as the distance continuously decreases in the negative rotational direction M (see Figures 19-22).

[0078] By arranging the detent recesses 64 at different height levels (increasing or decreasing in the circumferential direction), the user is given a tactile signal of the increase or decrease in spring force that must be overcome to overcome the detent position when operating the adjustment device E.

[0079] In another embodiment, the adjustment wheel 45 can be connected to the adjustment screw 38 in a non-destructive and non-removable manner, so that, for example, after the factory default position is set, the user can no longer access only the adjustment screw 38 that defines the default setting. Thereafter, only fine adjustments using the adjustment wheel 45 are possible.

[0080] Referring to Figures 9-14, the basic functions of the wire stripping pliers 1 are described below. Figures 9-11 show the function of stripping the insulation from a cable 21 with a relatively large diameter d, and Figures 12-14 show the function of stripping the insulation from a cable 21 with a relatively small diameter d.

[0081] Depending on the total diameter d of the cable 21, the diametrical thickness of the insulating sheath 43 that is cut or incised will be determined by a substantially constant ratio.

[0082] When the movable handle portion 5 pivots toward the fixed handle portion 4 around its axis y (see, for example, pivot direction f in Figure 10), the control lever 11 acts on the pull rod 30. As a result, the pull rod 30 is supported on the bridge portion 31 of the jaw-side cantilever 13 via its working end 70, and in response, the movable handle portion 5 pivots and acts indirectly on the cantilever 13 and the jaw 3 fixedly connected to it. This closes the pliers jaws ZM to the clamp position, and the clamp jaws 19 and 20 grip the cable 21.

[0083] Through the sliding surfaces 34 of the pliers jaws 3 and 35 of the slide shoe 36, the cutting jaws 22 and 23 rotate to roughly the same extent around the pivot axis 27 during the rotational movement of the pliers jaws. As a result, at the clamping position shown in Figure 9 or Figure 12, the blades 24 and 25 cut into the insulating coating 43 without damaging the exposed stranded wire 44.

[0084] Depending on the paths of the cutting blades 32 and 33 in the circumferential direction of the cable 21, a substantially complete cut can be performed in the circumferential direction. As used in the embodiments described above, if linear cutting blades 32 and 33 are used, each cutting blade 32 and 33 can also perform a split cut, thereby initially leaving a peeled web that is substantially opposite in the diametrical direction.

[0085] In the cable clamp position shown in Figure 9 or 12, further pivotal movement of the movable pliers jaws 3 toward the closed position of the pliers jaws, and therefore of the pair of cutting jaws 26, is prevented. As a result, in the process in which the movable handle 5 is further actuated and pivots further beyond the clamp position (pivot direction f), the pull rod 30, which continues to be actuated via the control lever 11, first slides along the bridge 31 toward the free end 67 of the fixed handle 4 in direction r (see Figure 10 or 13), and then reaches the end position where the pull rod 30 loses support on the bridge 31 and its working end 70 falls into the free space 68 remaining in direction r between the bridge 31 and the adjacent control unit 68 (see Figure 11 or 14).

[0086] As the pull rod 30 moves further in direction r, the pair of cutting jaws 26 are also moved linearly while maintaining their cutting positions, and as a result, when the remaining peeled web is peeled off during the cutting process, the ends 71 ​​of the insulating coating 43 are peeled off from the conductor, i.e., the stranded wire 44, exposing the conductor.

[0087] When the pull rod 30 reaches an overrun position where it loses support from the cantilever-side bridge section 31, the restoring force of the pre-tensioned spring 28 during the closing motion between the cutting jaws 22 and 23 causes the cutting jaws 22 and 23, and through them in particular the movable pliers jaw 3, to pivot back toward the starting position. The pliers jaws ZM open, releasing the cable 21 with its stripped end and discarding the cut and pulled-out portion 71 of the insulating sheath 43.

[0088] When the operating force on the movable handle 5 is removed, the movable handle 5 returns to its basic position due to the restoring force of the return spring 14, dragging the pull rod 30 via the control lever 11. As a result, the working end 70 on the pull rod side slides on the control unit 68, causing the pull rod 30 to experience an impact of linear return displacement in the opposite direction to the arrow r. This returns the pair of cutting jaws 26 to the starting position shown, for example, in Figure 2. [Explanation of Symbols]

[0089] 1. Wire stripping pliers 2 Fixed pliers jaws 3. Movable pliers jaws 4 Fixed handle 5. Movable handle 6. Cheek area 7. Swivel axis 8 shoulder area 9 Prominent area 10 Support surface 11 Control lever 13 Cantilever 14. Return spring 15 Counterblade 16 links 17 Blades 18 areas 19 Clamp jaw 20 Clamp jaws 21 Cables 22. Cutting jaw 23. Severed jaw 24 blades 25 blades 26 pairs of cutting jaws 27. Swivel axis 28 Springs 29 Stop Carriage 30 Pulling Rod 31 Bridge section 32 Cutting blade 33 Cutting blade 34 Sliding surface 35 Sliding surface 36 Slide shoe 37 axes 38 Adjustment screws 39 External thread 40 threaded holes 41 Support part 42 drive holes 43 Insulating coating 44 stranded wire 45 Adjustable Wheel 46 Mark 47 Counter Mark 48 recess 49 Knurling 50 Bottom 51 Drive protrusion 52 Tools 53 Locking screws 54 Screw threads 55 holes 56 Protrusion 57 Groove 58 marks 59 Mark 60 Detent devices 61 Bass 62 Detent projections 63 recess 64 Detent recess 64' Detent recess 65 Recessed edge 66 Recessed Valley 67 Free end 68 Control Unit 69 Free space 70 working end Section 71 a distance b depth c distance d diameter f Turning direction r direction t axis of rotation x-axis y-axis z-axis E Adjustment device M - Negative rotation direction P plus rotation direction ZM pliers α angle

Claims

1. A wire stripping plier (1) having two plier jaws (2, 3), two outer clamp jaws (19, 20), two inner cutting jaws (22, 23), and two handle portions (4, 5), The cutting jaws (22, 23) are movable from a starting position to an ending position during the process of gripping the handle portion (4, 5), and each of the cutting jaws (22, 23) has a blade (24, 25) equipped with a cutting blade (32, 33). In the wire stripping pliers, the cutting blades (32, 33) are at a predetermined distance (a) from each other at a predetermined position where the cutting jaws (22, 23) are close to each other, and the distance (a) is adjustable by an adjustment screw (38) to a position considered to be the basic position, The adjustment screw (38) is connected to an adjustment wheel (45), and the adjustment wheel (45) is alignable with a mark (46) for the base position fixed to one of the pliers jaws (2, 3). The position of the adjustment wheel (45) relative to the adjustment screw (38) is fixed in an unchangeable manner, and this fixing is achieved by a locking screw (53) that penetrates the adjustment wheel (45) and is received by the threads (54) of the adjustment screw (38), or by active engagement between the adjustment wheel (45) and the adjustment screw (38). The receiving portion for the adjustment screw has a polygonal cross-section for receiving the polygonal drive projection of the adjustment wheel (45), and, Wire stripping pliers characterized in that the active engagement is ultimately secured by a locking screw (53) that passes through the central hole (55) of the adjustment wheel (45) and engages with the threads (54) of the adjustment screw (38).

2. The wire stripping pliers according to claim 1, characterized in that the adjustment wheel (45) interacts with a detent device (60) fixed to the pliers jaws (2, 3).

3. The wire stripping pliers according to claim 2, characterized in that the detent device (60) has a protruding elastic detent projection (62) that engages with the detent recess (64, 64') of the adjustment wheel (45).

4. The wire stripping pliers according to claim 3, characterized in that a plurality of detent recesses (64, 64') are formed in the rotational direction (P / M) of the adjustment wheel (45), and the detent recesses (64, 64') are formed at different height levels in the rotational direction (P / M).

5. The wire stripping pliers according to any one of claims 1 to 4, characterized in that a limit is provided to restrict the rotation of the adjustment wheel (45) to a predetermined rotation angle range (α).

6. The wire stripping pliers according to claim 5, characterized in that the rotation angle range (α) is less than 360°.

7. The wire stripping pliers according to claim 5, characterized in that the rotation of the adjustment wheel (45) is limited by a projection (56) formed on the lower surface (50) of the adjustment wheel (45), and the projection (56) engages with a length-limited groove (57) of the pliers jaws (2, 3).

8. The wire stripping pliers according to claim 1, characterized in that one or both of the cutting jaws (22, 23) act outward via the slide shoe (36) in the direction of movement of the cutting jaws (22, 23) relative to each other.

9. The wire stripping pliers according to claim 8, characterized in that the adjustment screw (38) acts on the slide shoe (36).

10. A method for setting the cutting blade distance in wire stripping pliers (1) having two plier jaws (2, 3), two outer clamp jaws (19, 20), two inner cutting jaws (22, 23), and two handle portions (4, 5), The cutting jaws (22, 23) are movable from a starting position to an ending position during the process of gripping the handle portion (4, 5), and each of the cutting jaws (22, 23) has a blade (24, 25) equipped with a cutting blade (32, 33). In the method described above, the cutting blades (32, 33) are at a predetermined distance (a) from each other at a predetermined position where the cutting jaws (22, 23) are close to each other, and the distance (a) is adjustable by an adjustment screw (38) to a position considered to be the basic position, The adjustment screw (38) is further connectable to an adjustment wheel (45), and the adjustment wheel (45) is alignable with a mark (46) for the base position fixed to one of the pliers jaws (2, 3). A method characterized in that only the adjustment screw (38) is used to set the basic position, and the adjustment wheel (45) is attached to the adjustment screw (38) to allow further distance adjustment from the basic position only after the cutting jaws (22, 23) have been aligned to this basic position.

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