Wire pulling jig for wire extension clamps

Abstract

A wire extraction jig for wire extension clamps, featuring a stable striking surface that allows for extremely efficient extraction of wires from the clamp. [Solution] A cylindrical support frame 2 is erected on the upper surface of the substrate 1. The outer peripheral stepped portion 35 of the clamp body 31 is locked to the upper end opening edge 2a of the support frame 2. One end of the clamp body 31, which grips the end of the electric wire W, is housed inside the support frame 2, and the other end protrudes above the support frame 2 and is fixed. A cylindrical impact receiving cylindrical cover 3 that can be fitted over the outer circumference of the support frame 2 is provided. The upper surface of the upper end closing plate 6 of the impact receiving cylindrical cover 3 becomes the impact receiving surface 7. An impact shaft 8 hangs down from the lower surface of the upper end closing plate 6 into the impact receiving cylindrical cover 3. When the clamp body 31 is placed on the upper end opening edge 2a of the support frame 2 and the impact receiving cylindrical cover 3 is fitted over the support frame 2, the lower end of the impact shaft 8 comes into contact with or comes close to the end of the electric wire W gripped by the clamp body 31.

Description

Technical Field

[0001] This invention relates to a jig for pulling out an electric wire from an extension clamp in order to use the extension clamp again after using the extension clamp to temporarily fix an electric wire by attaching it to the tip of the electric wire when laying a transmission line or removing an existing transmission line.

Background Art

[0002] As shown in FIG. 7, for the extension clamp, an end portion of an electric wire W is inserted into a substantially cylindrical clamp body 31 having a taper on the outer periphery, a wedge 32 having a tapered outer periphery is driven in from the end face side of the electric wire W, and the cut end portion of the electric wire W is gripped by the inner periphery of the clamp body 31. A cap 33 is put on one end portion of the clamp body 31, and a retaining wire 34 is locked in a locking hole 33a of the cap 33 to retain the electric wire W. Further, an outer peripheral step portion 35 is provided in the middle of the clamp body 31, and the end portion of the cap 34 is locked by the outer peripheral step portion 35.

[0003] After using it in this way, in order to use the extension clamp again, it is necessary to cut the end portion of the electric wire W to which the extension clamp is attached and remove the cut electric wire W from the extension clamp. Therefore, first, the cap 33 and the retaining wire 34 are removed from the clamp body 31. This state is shown in FIG. 8. However, although the extension clamp grips the end portion of the electric wire W with the clamp body 31, the outer peripheral portion of the electric wire W is pressed against the inner periphery of the hollow portion of the clamp body 31 by the wedge 32 within the clamp body 31. Therefore, it takes a considerable amount of labor to pull out the end portion of the electric wire W gripped by the clamp body 31.

[0004] Therefore, as shown in Figure 9, the end of the cut wire W was placed against the ground or floor, and the outer stepped portion 35 of the clamp body 31 was struck with a hammer 36 to shift the clamp body 31 relative to the wire W, thereby removing the wire W from the clamp body 31. Alternatively, as shown in Figure 10, the lower edge of the bell-shaped punching tool 37 was placed against the outer stepped portion 35 of the clamp body 31 with the cap 33 removed, the punching tool 37 was placed over the clamp body 31, and the upper end of the punching tool 37 was struck with a hammer 36 to remove the clamp body 31 from the wire W.

[0005] In these methods, the clamp body 31 that grips the electric wire W is not fixed and is unstable, making it difficult to easily move the clamp body 31 relative to the electric wire W. The hammer also fails to properly strike the outer stepped portion 35 of the clamp body 31, making the method inefficient.

[0006] Therefore, as shown in Patent Document 1, a clamp body 1 that grips the electric wire W is fixed inside a frame, a hydraulic cylinder having an output shaft opposite to the central axis of the electric wire W is fixed to the frame, and the output shaft is pushed out by hydraulic pressure to press the electric wire W, which is then shifted inside the clamp body 1 and removed together with the wedge. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Official Gazette No. 60-8498 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0008] However, preparing a frame to fix and support the clamp body 31, or preparing a hydraulic cylinder, is time-consuming and costly, and its weight makes it difficult to handle, resulting in poor work efficiency.

[0009] Therefore, in order to solve the above-mentioned problems, this invention aims to provide a simple wire extraction jig for wire extension clamps that uses a hammer as in the conventional method, but has a stable striking surface and can remove the wire from the wire extension clamp very efficiently. [Means for solving the problem]

[0010] The invention of claim 1 is configured such that a cylindrical support frame is erected on the upper surface of a substrate, the outer peripheral stepped portion of the clamp body is locked to the upper end opening edge of the support frame, one end of the clamp body that grips the end of the electric wire is housed inside the support frame, and the other end protrudes above the support frame and is fixed in place, a cylindrical impact receiving cover that can be fitted over the outer circumference of the support frame is provided, the upper surface of the upper end closing plate of the cylindrical impact receiving cover becomes the impact receiving surface, and the impact shaft is impact receiving from the lower surface of the upper end closing plate This wire pulling jig for a wire extension clamp is configured such that a clamp body, which grips the end of the electric wire, is placed on the upper opening edge of the support frame, with the impact-receiving cylindrical cover hanging down inside the support frame, and when the impact-receiving cylindrical cover is placed over the support frame, the lower end of the impact shaft comes into contact with or comes close to the end of the electric wire gripped by the clamp body, and when the impact-receiving surface is pressed or struck from above, the lower inner circumference of the impact-receiving cylindrical cover slides along the outer circumference of the support frame, and the lower end of the impact shaft presses against the end of the electric wire.

[0011] Furthermore, the invention of claim 2 is a wire pulling jig for a wire extension clamp as described in claim 1, wherein when the clamp body that grips the end of the electric wire is fixed to the support frame, an annular spacer is placed over the tapered outer circumference of the clamp body, the impact receiving cylindrical cover is placed over the spacer, and when the impact receiving surface of the impact receiving cylindrical cover is pressed downward or struck, the inner circumference of the impact receiving cylindrical cover comes into contact with the outer circumference of the annular spacer and slides.

[0012] Furthermore, the invention of claim 3 is a wire pulling jig for a wire pulling clamp according to claim 1 or 2, wherein when a clamp body that grips the end of a wire is fixed to the support frame and the impact receiving cylindrical cover is placed over them, one or more opening windows are provided on the side surface of the impact receiving cylindrical cover so that it is possible to see from outside the impact receiving cylindrical cover whether the lower end of the impact shaft inside the impact receiving cylindrical cover is in contact with or close to the end of the wire gripped by the clamp body.

[0013] Furthermore, the invention of claim 4 is a wire pulling jig for a wire pulling clamp according to claim 1, wherein the impact receiving surface of the impact receiving cylindrical cover is a cone shape with a rounded top. [Effects of the Invention]

[0014] According to each invention of claim 1, the cap of the wire extension clamp is removed and the outer stepped portion of the clamp body gripping the end of the electric wire is placed on the upper end opening edge of the support frame, a part of the clamp body and the cut end of the electric wire are made to protrude above the support frame, a striking receiving cylindrical cover is placed over this, and when the striking receiving surface of the striking receiving cylindrical cover is struck with a hammer or the like, the lower surface of the striking shaft inside presses against the cut end of the electric wire gripped by the clamp body, and the electric wire comes off the clamp body together with the wedge.

[0015] Because the outer diameter of the impact receiving surface is larger than the outer diameter of the wire end gripped by the clamp body, and because the clamp body gripping the wire end is supported and fixed on a support frame, the impact or pressure from the upper end of the cylindrical impact receiving cover is reliably transmitted to the wire end, and the wire end easily detaches from the clamp body.

[0016] Furthermore, since the jig consists of a cylindrical support frame erected on a base plate and a cylindrical impact-receiving cover that surrounds the outer circumference of the support frame, it eliminates the need for hydraulic cylinders and other components, and does not require much space for transport or storage.

[0017] Further, according to the invention of claim 2, when fixing the clamp body that grips the end of the electric wire to the support base, an annular spacer is placed on the tapered outer periphery of the clamp body, and the impact receiving cylindrical cover is placed thereon. Therefore, when the annular spacer slides with the impact receiving cylindrical cover, it serves as a guide, and when the impact receiving cylindrical cover descends along the outer periphery of the cylinder of the support base, the internal impact shaft descends vertically, and the end of the electric wire can be struck more surely.

[0018] Further, according to the invention of claim 3, since an opening window is provided on the side surface of the impact receiving cylindrical cover, when placing the clamp body that grips the end of the electric wire on the support base and covering the impact receiving cylindrical cover thereon, it can be confirmed from the outside through the opening window whether the lower end of the internal impact shaft is close to or in contact with the end of the electric wire, and the end of the electric wire can be efficiently pulled out.

[0019] Further, according to the invention of claim 4, since the impact receiving surface of the impact receiving cylindrical cover has a conical shape with a rounded top, it is easy to strike with a hammer or the like, and it can hit surely, improving workability.

Brief Description of the Drawings

[0020] [Figure 1] It is a perspective view of the electric wire pulling-out jig of the extension clamp in Embodiment Example 1 of this invention. [Figure 2] It is a front view of the electric wire pulling-out jig of the extension clamp in Embodiment Example 1 of this invention. [Figure 3] It is a longitudinal sectional view of the support base of the electric wire pulling-out jig of the extension clamp in Embodiment Example 1 of this invention. [Figure 4] It is a partial longitudinal sectional view of the impact receiving cylindrical cover of the electric wire pulling-out jig of the extension clamp in Embodiment Example 1 of this invention. [Figure 5] It is a partial sectional front view of the support base of the electric wire pulling-out jig of the extension clamp in Embodiment Example 1 of this invention with the clamp body that grips the end of the electric wire placed thereon. [Figure 6]This is a partial longitudinal cross-sectional front view of the extension clamp wire extraction jig of Embodiment Example 1 of the present invention with the clamp body housed therein. [Figure 7] This is a cross-sectional side view of the extension clamp connected to an electric wire. [Figure 8] This is a side view of the clamp body gripping the end of an electric wire, which is attached to the extension clamp wire extraction jig of Embodiment Example 1 of the present invention. [Figure 9] This is a front view showing a method of pulling out an electric wire from a conventional clamp body. [Figure 10] This is a front view showing a method of pulling out an electric wire from another conventional clamp body.

Mode for Carrying Out the Invention

[0021] (Embodiment Example 1) The extension clamp wire extraction jig A of Embodiment Example 1 of the present invention will be described based on FIGS. 1 to 6.

[0022] As shown in FIGS. 1 and 2, the extension clamp wire extraction jig A of this extension clamp is composed of a cylindrical support stand 2 erected on a quadrilateral substrate 1 and a striking receiving cylindrical cover 3 covering the support stand 2. Specifically, a circular hole 1a is drilled in a substantially central portion of the substrate 1, and the lower portion of the support stand 2 is fitted into the circular hole 1a, and the support stand 2 is erected. Further, rubber legs 4 are provided at the four corners of the substrate 1, and the substrate 1 is fixed floating from the floor surface. Furthermore, ribs 5 extending outside the substrate 1 are provided at the lower outer periphery of the cylindrical support stand 2.

[0023] The striking receiving cylindrical cover 3 is slidably covered on the outer periphery of the support stand 2, has an upper end closing plate 6, and a striking receiving surface 7 is formed on the upper surface of the upper end closing plate 6. Further, the striking receiving surface 7 has a conical shape with a rounded top.

[0024] Furthermore, a striking shaft 8 hangs down from the center of the lower surface of the upper end closing plate 6 of the striking cylindrical cover 3. The striking shaft 8 is located on the central axis of the hollow portion 3a of the striking cylindrical cover 3. In addition, multiple opening windows 9 are provided on the side surface of the striking cylindrical cover 3. Separately from the support frame 2 and the striking cylindrical cover 3, an annular spacer 10 is provided for use inside the striking cylindrical cover 3. The outer diameter of the annular spacer 10 is approximately the same as the outer diameter of the support frame 2.

[0025] To pull out the end of the electric wire W from the clamp body 31 that is gripping the end of the electric wire W, as shown in Figure 8, using the electric wire pulling jig A of the wire pulling clamp having the above configuration, as shown in Figure 5, place the base plate 1 of the support frame 2 on the ground or floor, and place the clamp body 31 that is gripping the end of the electric wire W on the upper end opening edge 2a of the support frame 2.

[0026] As a result, one end of the clamp body 31 is inserted into the hollow portion 2b of the support frame 2, the other tapered end protrudes above the support frame 2, and the end of the electric wire W protrudes slightly from the upper end of the clamp body 31.

[0027] Then, the annular spacer 10 is placed over the tapered outer circumference of the clamp body 31. After that, the impact receiving cylindrical cover 3 is placed over the support frame 2 from above the clamp body 31. As a result, as shown in Figure 6, the lower inner circumference of the impact receiving cylindrical cover 3 slides against the upper outer circumference of the support frame 2, and the middle inner circumference of the impact receiving cylindrical cover 3 slides against the outer circumference of the annular spacer 10.

[0028] Furthermore, the upper end of the striking shaft 8, which hangs down inside the hollow portion 3a of the striking receiving cylindrical cover 3, is in contact with or close to the end of the electric wire W held by the clamp body 31. These conditions can be observed from outside the striking receiving cylindrical cover 3 through the opening window 9 of the striking receiving cylindrical cover 3.

[0029] In this state, when an operator strikes the striking surface 7 at the head of the striking cylindrical cover 3 with a hammer or the like, the striking cylindrical cover 3 descends along the outer circumference of the support frame 2, and the striking shaft 8 inside the striking cylindrical cover 3 presses against the end of the electric wire W protruding from the upper end of the clamp body 31 supported by the support frame 2, thereby pushing the end of the electric wire W out of the clamp body 31.

[0030] As described above, when using the wire pulling jig A of this invention, with the clamp body 31 gripping the electric wire W firmly fixed to the support frame 2, striking the striking receiving surface 7 at the top of the striking receiving cylindrical cover 3 causes the striking receiving cylindrical cover to descend along the support frame 2, and the internal striking shaft 8 presses against the end of the electric wire W, so that the end of the electric wire W gripped by the clamp body 31 can be easily and reliably pulled out from the clamp body 31.

[0031] In the above embodiment example 1, the support frame 2 and the impact receiving cylindrical cover are cylindrical, but they are not limited to these, and can be rectangular or polygonal. In that case, the inner periphery that locks the outer stepped portion of the clamp body 31 should be shaped to match the outer stepped portion of the clamp body. The rubber feet 4 provided at the four corners of the base plate 1 prevent damage to the base plate 1 or the floor surface from the impact of the impact when the wire pulling jig A of the wire pulling clamp pulls out the wire W from the clamp body 31, and also stabilize the base plate 1. [Explanation of symbols]

[0032] A wire pulling tool for wire extension clamps W electric wire 1 substrate 1a circular hole 2 Support frame 2a Upper end opening edge 2b Hollow section 3 Impact receiving cylindrical cover 3a Hollow section 4 Rubber feet 5 Ribs 6 Upper end closing plate 7. Impact receiving surface 8. Impact axis 9 Opening window 10 Annular spacer 31 Clamp body 32 Wedge 33 Cap 33a Locking hole 34 Retaining wire 35 Outer perimeter section 36 Hammer 37 Punching tool

Claims

1. A cylindrical support frame is erected on the top surface of the circuit board. The support frame is configured such that the outer periphery of the clamp body is locked to the upper opening edge, one end of the clamp body that grips the end of the electric wire is housed inside the support frame, and the other end protrudes above the support frame and can be fixed in place. A cylindrical impact receiving cover is provided on the outer circumference of the support frame, the upper surface of the upper end closing plate of the impact receiving cylindrical cover serves as the impact receiving surface, and the impact shaft hangs down into the impact receiving cylindrical cover from the lower surface of the upper end closing plate. A wire pulling jig for a wire pulling clamp, characterized in that when the clamp body gripping the end of the electric wire is placed on the upper opening edge of the support frame and the impact receiving cylindrical cover is placed over the support frame, the lower end of the impact shaft comes into contact with or approaches the end of the electric wire gripped by the clamp body, and when the impact receiving surface is pressed or struck from above, the lower inner circumference of the impact receiving cylindrical cover slides along the outer circumference of the support frame, and the lower end of the impact shaft presses against the end of the electric wire.

2. The wire pulling tool for a wire pulling clamp according to claim 1, characterized in that when the clamp body that grips the end of the electric wire is fixed to the support frame, an annular spacer is placed over the outer circumference of the clamp body, the impact receiving cylindrical cover is placed over the spacer, and when the impact receiving surface of the impact receiving cylindrical cover is pressed downward or struck, the inner circumference of the impact receiving cylindrical cover comes into contact with the outer circumference of the spacer and slides.

3. The wire pulling tool for a wire pulling clamp according to claim 1 or 2, characterized in that when the clamp body gripping the end of the electric wire is fixed to the support frame and the impact receiving cylindrical cover is placed over them, one or more opening windows are provided on the side surface of the impact receiving cylindrical cover so that it is possible to visually confirm from outside the impact receiving cylindrical cover whether the lower end of the impact shaft inside the impact receiving cylindrical cover is in contact with or close to the end of the electric wire gripped by the clamp body.

4. The wire pulling jig for a wire pulling clamp according to claim 1, characterized in that the impact receiving surface of the impact receiving cylindrical cover has a conical shape with a rounded top.

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