Stripping unit of a crimping tool, crimping tool and method for mounting an adjustment unit

Description

[0001] The present invention relates to a stripping unit of a crimping tool for cutting and stripping a conductor insulation of a conductor cable according to the preamble of claim 1.

[0002] The invention further relates to a pressing tool according to the preamble of claim 7 and to a method for assembling an adjustment unit of such a stripping unit.

[0003] Stripping units of this type are described, for example, in EP 2056415 B1. In the stripping pliers known from this publication, the stripping unit has a clamping jaw with a first clamping lip that can be pressed against a second clamping lip arranged on the stripping pliers, and a first blade unit mounted in the clamping jaw that can be pressed against a second blade unit behind the second clamping lip.

[0004] In order to reliably separate cable insulation layers of varying thickness or material composition from the conductor, it is suggested here to provide several blade holders that can be easily exchanged on the described wire stripper.

[0005] The construction shown and described there has proven itself in practice.

[0006] US Patent 4,485,696 A discloses a wire stripping unit in which, for the purpose of separating insulation layers of cables with different material compositions below the lower knife holder, an adjusting screw is screwed directly into a base of the clamping jaw, wherein the base of the clamping jaw must have a large material thickness to reliably hold the adjusting screw and thereby increases the weight of the hand tool.

[0007] The object of the present invention is to provide a stripping unit of a crimping tool and a crimping tool in which the replacement of the knife holders for separating the insulating layer from the conductor can be avoided by providing an adjusting screw for adjusting the cutting depth of a knife holder, with alternative mounting of the adjusting screw.

[0008] A further object of the invention is to provide a simple method for assembling a stripping unit.

[0009] The first problem is solved by a stripping unit of a crimping tool for cutting and peeling off a conductor insulation of a conductor cable with the features of claim 1 and by a crimping tool with the features of claim 7.

[0010] The second problem is solved by a method for assembling a stripping unit with the features of claim 9.

[0011] The stripping unit according to the invention of a crimping tool for cutting and stripping a conductor insulation of a conductor cable has a first clamping jaw with a first clamping lip that can be pressed against a second clamping lip arranged on the crimping tool, and a first knife unit mounted in the clamping jaw.

[0012] The clamping jaw contains an adjustment unit for variable adjustment of the cutting depth of the knife unit, with an adjusting screw and a plate for raising or lowering the knife unit.

[0013] The adjusting screw can be adjusted through an opening in the floor of the recording chamber.

[0014] Furthermore, the adjustment unit has a nut for holding the adjusting screw in a receiving chamber of the clamping jaw and a pressure plate that can be supported by the plate.

[0015] With such a stripping unit according to the invention, the bearing height of the knife unit in the clamping jaw can be adjusted in an extremely simple way to different insulating material thicknesses of the conductor insulation of a conductor cable, without having to provide different knife units with differently dimensioned knives and without the material thickness of the clamping jaw being kept small to provide a sufficiently long thread for the adjusting screw by means of the nut housed in the receiving space of the clamping jaw.

[0016] The pressure plate ensures an even contact surface for the knife unit.

[0017] Advantageous embodiments are the subject of the dependent claims.

[0018] According to an advantageous further development, the plate and adjusting screw are formed in one piece.

[0019] This reduces the assembly effort for the stripping unit.

[0020] According to a further advantageous embodiment, projections are formed on the opposing side walls of the clamping jaw in the receiving space, wherein the nut is secured in a space between a floor of the receiving space and an underside of the projections facing this space against lateral displacement in the direction of the side walls and against lifting away from the floor.

[0021] This particularly allows the use of an adjusting screw formed integrally with the plate, which can be inserted into the receiving space from an open top side facing away from the bottom.

[0022] According to an advantageous embodiment, an end piece of the adjusting screw, which extends from a side of the plate facing away from the ground, extends into a bore in the pressure plate.

[0023] This allows easy access to the adjusting screw, for example with a screwdriver.

[0024] According to another advantageous embodiment, the receiving space of the clamping jaw has an inlet shaft through which the adjusting screw together with the nut can be inserted in a lowering manner towards the bottom.

[0025] According to another preferred embodiment, the nut is designed as a square nut, which allows for particularly easy rotational fixation of the nut in the receiving space of the clamping jaw.

[0026] The pressing tool according to the invention has two handles that can be moved relative to each other, a housing shell and a stripping unit arranged on the housing shell with a clamping jaw that can be pivoted relative to the housing shell.

[0027] The clamping jaw, together with a clamping lip on the front part of the housing shell, forms a tool mouth in which two knife holders, each with a stripping knife, are mounted and movable relative to each other.

[0028] The stripping unit is characterized by the structure described above.

[0029] The method according to the invention comprises the following process steps: Tighten the adjusting screw with the nut until the first end of the adjusting screw does not protrude from the nut, insert the adjusting screw with the nut into the receiving space of the clamping jaw, move the nut with the adjusting screw into an area between the projections and the base until the first end of the adjusting screw is positioned on the opening in the base, place the pressure plate onto the plate of the adjusting screw.

[0030] Preferred embodiments of the invention are explained in more detail below with reference to the accompanying drawings. These show: Figure 1 shows a side view of an embodiment of a pressing tool according to the invention with a stripping unit; Figure 2 shows a close-up of the in Figure 1Section of the pressing tool designated II, Figures 3 - 9 are perspective or sectional views of the clamping jaw of the stripping unit with the adjustment unit built into it during different assembly steps.

[0031] In the following figure descriptions, terms such as top, bottom, left, right, front, back, etc., refer exclusively to the exemplary representation and position of the stripping unit, crimping tool, clamping jaw, adjusting screw, and the like as chosen in the respective figures. These terms are not to be understood as restrictive; that is, these references may change due to different working positions, mirror-symmetrical design, or similar factors.

[0032] In Figure 1A variant embodiment of a pressing tool according to the invention is designated by reference numeral 1. The pressing tool 1 has two hand levers 2 and 3. One hand lever 2 is integrally formed on a housing shell 7, while the other hand lever 3 is pivotably mounted on the housing shell 7.

[0033] Instead of operating the pressing tool 1 by the handles 2, 3, it is also conceivable to design the pressing tool 1 as an automatic or semi-automatic pressing tool with a motor drive.

[0034] The pressing tool 1 further includes a crimping unit 6 and a cutting unit 5, with which a conductor cable can be cut.

[0035] Furthermore, the crimping tool 1 has a tool mouth, referred to here as a stripping unit 4, in which a sheathing of a section of a conductor cable determined by an operator of the crimping tool 1 can be removed from the conductor strand.

[0036] The stripping unit 4 has a first clamping jaw 8, at the front end of which a clamping lip 10 is arranged. The other part of the tool mouth is limited by a second clamping lip 9 arranged on the housing shell 7 of the pressing tool 1.

[0037] A first knife unit 20 is mounted in the clamping jaw 8, which is coupled to a second knife unit 28 via a spring element 30 and is located behind the second clamping lip 9 in the jaw of the pliers.

[0038] To adjust the length of the insulating material to be stripped, in the preferred embodiment shown here, as in Figure 2 It can be clearly seen that a ladder stop 29 is slidably fixed to the upper knife unit 28.

[0039] As in the Figures 3 - 9 As shown, the clamping jaw 8 contains an adjustment unit for the variable adjustment of the cutting depth of the knife unit 20.

[0040] The adjustment unit has an adjusting screw 14, a nut 12 for holding the adjusting screw 14 in a receiving chamber 21 of the clamping jaw 8 and a plate 11 for raising or lowering the knife unit 20.

[0041] The adjusting screw 14 is located through an opening 19 in a floor 15 of the receiving chamber 21, as shown by way of example in Figure 9 As shown, it is adjustable.

[0042] The construction of the adjustment unit and its assembly in the clamping jaw 8 will now be described using the following: Figures 3-9 explained in more detail.

[0043] As in Figure 3 As shown, the adjusting screw 14 is first screwed to the nut 12, which is preferably designed as a polygonal, in particular square, nut.

[0044] The adjusting screw 14 points at its in the Figures 3-9At the lower end, a tool holder 26, for example an internal polygonal opening, is located on the end face. A neck piece 32 with an external thread extends from this tool holder 26.

[0045] Above this neck piece 32, the diameter of the adjusting screw 14 is widened by a plate 11.

[0046] In addition to the one-piece design of the plate 11 with the adjusting screw 14 shown here, it is also conceivable to place the plate 11 onto the screw or to screw it on.

[0047] Above the plate 11 extends another neck piece of the adjusting screw 14, here referred to as end piece 25, which serves to prevent the displacement of a pressure plate 13 on which the knife unit 20 rests when the stripping unit 4 is mounted.

[0048] In the Figures 3 and 4In the assembly steps shown, the adjusting screw 14 is screwed to the nut 12 to such an extent that a first end (with the tool holder) of the adjusting screw 14 does not protrude from the nut 12.

[0049] The adjusting screw 14 with the nut 12 is inserted into the Figures 3 and 4 inserted from above into the receiving chamber 21 of the clamping jaw 8, which is open towards the tool mouth.

[0050] The mother 12 is pressed down to the floor 15 of the recording room 21 along an inlet shaft 17 provided in the recording room 21.

[0051] Subsequently, the adjusting screw 14 together with the nut 12 is moved along the base 15 into an area between projections 16 and the base 15 in the direction of the first clamping lip 10.

[0052] In the embodiment shown here, the projections 16 are designed as webs projecting from opposing side walls 22, 23 of the clamping jaw 8. There is sufficient distance between a lower edge of these projections 16 and the base 15 to accommodate the nut 12.

[0053] In the Figure 5 In the position shown, the adjusting screw 14 with the nut 12 prevents the nut 12 from being lifted away from the ground 15 by the projections 16.

[0054] Furthermore, in this position, the first end of the adjusting screw 14 is positioned over an opening 19 in the base 15 of the receiving chamber 21, so that by subsequently turning the adjusting screw 14 into the opening 19 in the base 15, the nut 12 remains in its position, but the adjusting screw 14 itself, together with the plate 11, is moved vertically. By positioning the end equipped with the tool holder 26 in the opening 19 in the base 15 of the receiving chamber 21, the adjusting screw is additionally secured against being pushed back into the inlet shaft 17.

[0055] The in Figure 6 The elevation view of the clamping jaw 8 shows again the locked position of the nut 12 between base 15 and projections 16.

[0056] As in Figure 7 , 8 and 9 As shown, the pressure plate 13 is then placed on the plate 11 of the adjusting screw 14.

[0057] In this pressure plate 13 a bore 24 is provided into which the end piece 25 of the adjusting screw 14 dips and thus fixes the pressure plate 13 in a form-fitting manner in the support plane of the pressure plate 13.

[0058] It is also conceivable to have a design variant of the pressure plate 13 without such a bore 24. In this case, the adjusting screw 14 ends at the top of the plate 11, so that an underside of the pressure plate 13 rests on the plate 11 as in the design variant shown, and the pressure plate 13 is secured within the clamping jaw 8 against being moved away from the plate 11.

[0059] The knife unit 20 rests on the pressure plate 13.

[0060] By adjusting the adjusting screw 14, it is thus possible in a simple way to raise or lower the pressure plate 13, which is accompanied by a raising or lowering of the knife unit 20 in order to adjust the cutting depth of the knife 27 of the knife unit 20 in the conductor insulation of the conductor cable. Reference symbol list

[0061] 1 Pressing tool 2 First handle 3 Second handle 4 Stripping unit 5 Cutting unit 6 Crimping unit 7 Housing shell 8 Clamping jaw 9 Clamping lip 10 Clamping lip 11 Plate 12 Nut 13 Pressure plate 14 Adjusting screw 15 Base 16 Projection 17 Inlet shaft 18 Step 19 Opening 20 First blade unit 21 Receiving chamber 22 Side wall 23 Side wall 24 Bore 25 End piece 26 Tool holder 27 Blade 28 Second blade unit 29 Ladder stop 30 Spring element 31 Ferrule 32 Neck

Claims

1. A stripping unit (4) of a pressing tool (1) for cutting into and stripping a conductor insulation of a conductor cable, having - a first clamping jaw (8) with a first clamping lip (10) which can be pressed against a second clamping lip arranged on the pressing tool (1), - a first knife unit (20) mounted in the clamping jaw (8), - wherein an adjustment unit for variably adjusting a cutting depth of the knife unit (20) is arranged in the clamping jaw (8), with an adjustment screw (14) and a plate (11) for lifting or lowering the cutting unit (20), - wherein the adjustment screw (14) can be adjusted through an aperture (19) in a floor (15) of the receiving space (21), characterized in that - the adjustment unit has a nut (12) for fastening the adjustment screw (14) in a receiving space (21) of the clamping jaw (8) and a pressure plate (13) which can be supported by the plate (11).

2. The stripping unit (4) according to claim 1, characterized in that the plate (11) is formed integrally with the adjustment screw (14).

3. The stripping unit (4) according to any one of the preceding claims, characterized in that protrusions (16) are molded on the side walls (22, 23) of the clamping jaw (8) which are situated opposite one another on the receiving space (21), the nut (12) being secured, in a space between a floor (15) of the receiving space (21) and an underside of the protrusions which faces this space, against lateral displacement in the direction of the side walls (22, 23) and against being lifted away from the floor (15).

4. The stripping unit (4) according to any one of the preceding claims, characterized in that an end piece (25) of the adjustment screw (14), which extends from a plate (11) side facing away from the floor, extends into a bore (24) in the pressure plate (13).

5. The stripping unit (4) according to any one of the preceding claims, characterized in that the receiving space (21) of the clamping jaw (8) has an inlet shaft (17), through which the adjustment screw (14) together with the nut (12) can be introduced in the direction of the floor (15) in a lowerable manner.

6. The stripping unit (4) according to any one of the preceding claims, characterized in that the nut (12) is formed as a square nut.

7. A pressing tool (1), having - a housing shell (7), - a stripping unit (4) which is arranged on the housing shell (7) and which has a clamping jaw (8) which can pivot relative to the housing shell (7), - wherein the clamping jaw (8), together with a clamping lip (9) on the front part of the housing shell (7), forms a tool mouth, in which two knife retainers, which are movable relative to one another, are each mounted with a stripping knife, characterized in that - the stripping unit (4) is formed according to any one or more of the preceding claims.

8. The pressing tool (1) according to claim 7 with two handles (2, 3), which are movable relative to one another, for actuating the pressing tool.

9. A method for mounting a stripping unit (4) according to any one of claims 3 or 4-6, if dependent on claim 3, with the method steps: - screwing the adjustment screw (14) onto the nut (12) to such an extent that a first end of the adjustment screw (14) does not protrude from the nut, - inserting the adjustment screw (14) with the nut (12) into the receiving space (21) of the clamping jaw (8), - displacing the nut (12) with the adjustment screw (14) into a region between the protrusions (16) and the floor (15) until the first end of the adjustment screw (14) is positioned on the aperture (19) in the floor (15), - placing the pressure plate (13) on the plate (11) of the adjustment screw (14).