Core wire gripping device and cutting tool with the same

Abstract

To provide a core wire gripping device capable of gripping an electric wire only with an extension operation of an extension rod material, and reducing a bent angle of the electric wire.SOLUTION: A core wire gripping device 10 is constructed by: a main body member 12 that includes a core wire coating part 20; a core wire depression member 14 that holds a core wire S between itself and the core wire coating part 20; a pair of link members 16 to which the core wire depression member 14 is rotatably and turnably journaled to a one end part 22; and an arm 18 to which the other end part 24 of the pair of link members 16 is rotatably and turnably journaled. The core wire coating part 20 includes a coated contact surface 21 that is contacted to an exposure end surface A of an insulation coating H of an electric wire L, and the core wire depression member 14 is moved to the core wire S via the pair of link members 16 when the one end part 26 of the arm 18 is moved toward an extension rod material 102, and an angle of the arm 18 to a center shaft CL of the extension rod material 102 is constant even if the one end part 26 of the arm 18 is moved toward the extension rod material 102.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a core wire gripper used in a cutting tool that pulls electric wires between electric poles and provides slack at the portion where the electric wires are to be cut in construction work such as replacing electric poles, and to a cutting tool equipped with the core wire gripper. [Background technology]

[0002] Conventionally, in construction work for replacing utility poles, as shown in FIG. 8, a cutting tool 3 has been used to attach to the wires 2 between the utility poles 1 and pull the wires toward each other to create slack in the section to be cut, in order to cut the wires 2 connected to the utility pole 1 to be replaced between the poles 1 and adjacent poles 1.

[0003] A wire gripper 4 capable of gripping the electric wire 2 is attached to each end of this cutting tool 3, and by gripping the electric wire 2 with each of the pair of wire grippers 4 and narrowing the space between the wire grippers 4, slack is generated in the electric wire 2 between the wire grippers 4 and the electric wire 2 can be prevented from drooping after cutting (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-145818 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, there was a problem with the wire gripper and cutting tool according to Patent Document 1. That is, in order to grip an electric wire with the wire gripper, in addition to a remote control tool for attaching the wire gripper to the electric wire, another remote control tool for tightening the eye ring tightening portion 92 of the wire gripper was required.

[0006] In addition, in the case of the wire gripper and cutting tool according to Patent Document 1, as shown in Fig. 9, an endless looped rope is used as a connector 6 that connects the wire gripper 4 and the extender 5, and the connector 6 is designed to be able to freely change the angle and interval between the wire gripper 4 and the extender 5. For this reason, when an electric wire 2 is gripped by a pair of wire grippers 4, the interval between the wire grippers 4 is narrowed by the extender 5, and then the electric wire 2 is cut between the wire grippers 4, the tension of the electric wire 2 causes the extender 5 and the electric wire 2 gripped by the wire grippers 4 to become straight, so that the bending angle of the electric wire 2 at the part gripped by the wire gripper 4 becomes too large (the part indicated by the arrow in the figure), causing damage to the electric wire 2.

[0007] The present invention has been made in consideration of these problems and demands, and its object is to provide a core wire holder that enables the cutting tool to be used with simpler operation and that can reduce the bending angle of the gripped portion of the wire, and a cutting tool equipped with the same. [Means for solving the problem]

[0008] According to one aspect of the present invention, A core wire gripper that is attached to the end of an extension rod and used, a main body member having a core wire covering portion extending along the core wire so as to cover the core wire; a core wire pressing member that sandwiches the core wire between the core wire covering portion and the core wire pressing member; a pair of link members each having a rotation center in the main body member and having the core wire pressing member rotatably attached to one end of the link members; The other end of each of the pair of link members is pivotally attached to an arm, and the extension rod is attached to one end of the arm. The core wire covering portion is formed at a position facing the expansion rod and has a covering abutment surface that abuts against an exposed end surface of an insulating covering of the electric wire, When the one end of the arm moves toward the expansion bar, the core wire pressing member moves toward the core wire via the pair of link members. A core wire gripper is provided.

[0009] Preferably, The covering contact surface is a surface perpendicular to the core covering portion.

[0010] Preferably, Even when the one end of the arm moves towards the expansion bar, the angle of the arm with respect to the central axis of the expansion bar remains constant.

[0011] According to another aspect of the present invention, A telescopic rod that can expand and contract its entire length; A pair of the above-mentioned core wire holders are attached to both ends of the stretch rod. A cutting tool is provided. Effect of the Invention

[0012] According to the present invention, when one end of the arm moves toward the telescopic rod, the core wire pressing member moves toward the core wire via the pair of link members. As a result, after the core wire covering portion of the main body member is attached to the core wire, the arm moves toward the telescopic rod by contracting the telescopic rod, and the core wire pressing member moves toward the core wire via the link members. Therefore, the core wire can be gripped between the core wire pressing member and the core wire covering portion simply by contracting the telescopic rod. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram showing an example of a cutting tool 100 according to an embodiment. [Diagram 2] FIG. 1 is a perspective view mainly showing an example of a core wire holder 10 according to an embodiment. [Diagram 3] 4A to 4C are diagrams showing a procedure for using the cutting tool 100 and the core wire holder 10. [Figure 4] 4A to 4C are diagrams showing a procedure for using the cutting tool 100 and the core wire holder 10. [Diagram 5] 4A to 4C are diagrams showing a procedure for using the cutting tool 100 and the core wire holder 10. [Figure 6] 4A to 4C are diagrams showing a procedure for using the cutting tool 100 and the core wire holder 10. [Figure 7] 4A to 4C are diagrams showing a procedure for using the cutting tool 100 and the core wire holder 10. [Figure 8] FIG. 13 is a diagram to explain the construction work to replace utility poles. [Figure 9] 1A and 1B are diagrams illustrating problems that arise when a conventional cutting tool is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] (Configuration of cutting tool 100 and core wire gripper 10) As shown in FIG. 1, the cutting tool 100 according to this embodiment generally comprises a rod-shaped extendable rod 102 and a pair of core wire holders 10 attached to both ends of the extendable rod 102.

[0015] The expansion bar 102 is generally composed of a pair of main body bars 104 and an expansion mechanism 106 attached to one of the main body bars 104 (the left one in FIG. 1).

[0016] The pair of main body bars 104 can be made into one bar by inserting one main body bar 104 into the end of the other main body bar 104, and further, by manipulating (preferably "rotating") the ring material 107 of the extension mechanism 106, the insertion depth of one main body bar 104 into the other main body bar 104 can be changed. This makes it possible to change the distance between the core wire holder 10 attached to the end of one main body bar 104 and the core wire holder 10 attached to the end of the other main body bar 104.

[0017] The core wire holder 10 is used to hold the exposed core wire S by stripping away the insulating coating H of the electric wire L, and as shown in FIG. 2, roughly comprises a main body member 12, a core wire pressing member 14, a pair of link members 16, and an arm 18.

[0018] The main body member 12 has a core wire covering portion 20 at the upper part in the figure that extends along the core wire S so as to cover the core wire S, which has an approximately U-shaped cross-sectional shape, and a pair of link members 16 are rotatably and axially attached to the lower part in the figure, as described below.

[0019] The core wire covering portion 20 has a covering abutment surface 21. The covering abutment surface 21 is formed in a position facing the expansion rod 102 and abuts against the exposed end surface A of the insulating covering H of the electric wire L. In this embodiment, the covering abutment surface 21 is formed as a surface perpendicular to the core wire covering portion 20.

[0020] The core wire pressing member 14 is a member that moves toward and away from the core wire covering portion 20, and is configured to hold the core wire S between the core wire covering portion 20 and the core wire pressing member 14. In addition, one end portion 22 of each of a pair of link members 16 is rotatably and axially attached to the core wire pressing member 14, as described later.

[0021] The pair of link members 16 has a rotation center in the main body member 12, and the core wire pressing member 14 is rotatably and axially attached to one end 22. The other end 24 of the pair of link members 16 is rotatably and axially attached to the arm 18.

[0022] As described above, the arm 18 has the other ends 24 of the pair of link members 16 rotatably attached to respective shafts, and the end 26 on the right side in the figure is adapted to have an end of an extension rod 102 attached thereto.

[0023] In addition, when one end 26 of the arm 18 moves toward the expansion rod 102, the core wire pressing member 14 moves toward the core wire S (the covering abutment surface 21 of the core wire covering portion 20) via the pair of link members 16.

[0024] Furthermore, one end 26 of the arm 18 and the end of the telescopic bar 102 are joined to each other, so that even if one end 26 of the arm 18 moves toward the telescopic bar 102, the angle of the arm 18 with respect to the central axis CL of the telescopic bar 102 remains constant and does not change.

[0025] (Procedure for using the cutting tool 100 and the core wire gripper 10) Next, a procedure for using the cutting tool 100 and the core wire gripper 10 according to this embodiment will be described. First, as shown in Fig. 3, at predetermined positions (two positions) of the electric wire L to which the cutting tool 100 is attached, the insulating coating H is stripped using an existing stripping tool or the like to expose the core wire S.

[0026] 4, the core wire covering portion 20 of the main body member 12 of the core wire holder 10 is hung on the exposed portion of the core wire S using a remote control device or the like. At this stage, approximately the upper half of the core wire S is covered with the core wire covering portion 20.

[0027] After the pair of core wire holders 10 are hung on the core wire S, the telescopic mechanism 106 is operated to contract the telescopic rod 102. As the telescopic rod 102 is contracted, the distance between the pair of core wire holders 10 decreases. Then, first, the entire core wire holder 10 moves in the direction toward the telescopic rod 102. Then, when the core wire holder 10 has moved to a certain extent, the covering abutment surface 21 of the core wire covering portion 20 in the main body member 12 comes into contact with the exposed end surface A of the insulating covering H of the electric wire L, as shown in FIG. 5.

[0028] When the telescopic rod 102 is further contracted, the main body member 12, which is in contact with the exposed end face A, cannot move any further, so the arm 18 (one end 26) moves toward the telescopic rod 102. This movement of the arm 18 causes the core wire pressing member 14 to move upward in the figure toward the core wire S via the pair of link members 16, and as shown in Figure 6, the core wire S is gripped by the core wire pressing member 14 and the core wire covering portion 20.

[0029] When the telescopic rod 102 is further contracted, the electric wire L in the section held by the pair of core wire holders 10 becomes loose as shown in Fig. 7, and the loosened portion of the electric wire L is cut by another tool or the like. Even if the electric wire L is cut, the tension of the electric wire L can be maintained because it is held by the pair of core wire holders 10, and the electric wire L can be prevented from sagging after cutting.

[0030] (Features of the cutting tool 100 and the core wire gripper 10) According to the core wire gripper 10 of the embodiment described above, when one end 26 of the arm 18 moves toward the telescopic bar 102, the core wire pressing member 14 moves toward the core wire S via the pair of link members 16. As a result, after the core wire covering portion 20 of the main body member 12 is attached to the core wire S, the arm 18 moves toward the telescopic bar 102 by contracting the telescopic bar 102, and the core wire pressing member 14 moves toward the core wire S via the link member 16. Therefore, the core wire S can be gripped between the core wire pressing member 14 and the core wire covering portion 20 simply by contracting the telescopic bar 102.

[0031] Furthermore, even if one end 26 of the arm 18 moves toward the telescopic rod 102, the angle of the arm 18 with respect to the central axis CL of the telescopic rod 102 remains constant, so even when the electric wire L is gripped by a pair of core wire grippers 10, the distance between the core wire grippers 10 is narrowed by the telescopic rod 102, and then the electric wire L is cut between the core wire grippers 10, although the telescopic rod 102 bends slightly due to the tension of the electric wire L, the bending angle of the electric wire L in the portion gripped by the core wire grippers 10 can be made small (see portion X in FIG. 7).

[0032] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0033] 10...core wire holder, 12...main body member, 14...core wire pressing member, 16...link member, 18...arm, 20...core wire covering portion, 21...covering contact surface, 22...one end (of link member 16), 24...other end (of link member 16), 26...one end (of arm 18) 100... Cutting tool, 102... Telescopic bar material, 104... Main body bar material, 106... Telescopic mechanism, 107... Ring material L...electric wire, H...insulating coating, S...core wire, A...exposed end surface, CL...center axis (of the expansion rod 102)

Claims

1. A core wire gripper that is attached to the end of an extension rod and used, a main body member having a core wire covering portion extending along the core wire so as to cover the core wire; a core wire pressing member that sandwiches the core wire between the core wire covering portion and the core wire pressing member; a pair of link members each having a rotation center in the main body member and having the core wire pressing member rotatably attached to one end of the link members; The other end of each of the pair of link members is pivotally attached to an arm, and the extension rod is attached to one end of the arm. The core wire covering portion is formed at a position facing the expansion rod and has a covering abutment surface that abuts against an exposed end surface of an insulating covering of the electric wire, When the one end of the arm moves toward the expansion bar, the core wire pressing member moves toward the core wire via the pair of link members. Core wire gripper.

2. The covering contact surface is a surface perpendicular to the core covering portion. The wire core holder according to claim 1.

3. Even if the one end of the arm moves toward the telescopic bar, the angle of the arm with respect to the central axis of the telescopic bar remains constant. The wire core holder according to claim 2.

4. A telescopic rod that can expand and contract its entire length; and a pair of core wire holders according to any one of claims 1 to 3 attached to both ends of the extension rod. Cutting tool.

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