JPH02231908A - Wire inserting tool - Google Patents

Abstract

PURPOSE:To perform wire inserting work smoothly by providing an inclining face on at least one of the outer circumference of a clamping metal or the inner circumference of a receive metal then clamping the end of wire between the outer circumference of the clamping metal and the inner circumference of the receive metal, thereby securing a bundle of wire to a pulling wire. CONSTITUTION:A tubular receive metal 2 having outer diameter shorter than the inner diameter of a tube 1 has one open end a dn the other end having a hole, where an inclining face 4 is provided at the inner circumference. A spherical clamping metal 7 secured with a pulling wire 6 for pulling a wire inserted into the hole 3 is placed in the receive metal, then a plurality of wires 8a, 8b, 8c are manually pushed into an annual space formed between the inclining face 4 at the inner circumference of the receive metal 2 and the outer circumference of the clamping metal 7. When the pulling wire 6 is pulled, the wires 8a, 8b, 8c are secured between the receive metal 2 and the clamping metal 7 through wedge function of the inclining face 4. The pulling wire 6 is passed through the tube 1, under this state, then it is pulled to pass the wire.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electric wire insertion tool for inserting a plurality of electric wires into conduits, insulating pipes, insulating tubes, etc. in switchboards, building electrical wiring, etc. Regarding.

[Conventional technology]

Conventionally, in order to insert multiple wires into a pipe, the ends of the bundled wires are tightly tightened with one end of a long wire, the other end of the wire is passed through the pipe, and the wires are pulled to separate the bundle of wires. was inserted into the tube.

[Problem to be solved by the invention]

With the above-mentioned conventional technology, the ends of the bundle of wires get caught in the center of the tube during tensioning, and the wires cannot be inserted smoothly due to friction between the outer periphery of the bundle or the knots of the wires and the inner periphery of the tube. There was a problem that some electric wires could come loose from the bundle.

Also, make the end of the wire that is tightened with wire a little longer,
Sometimes, one end of the wire is bent toward the other end to tighten the bundle with wire, but in this case, there is a limit to the number or thickness of the wires that can be passed through the tube, and the cross-sectional area inside the tube is reduced. There is also the problem that it cannot be used effectively and thicker tubes must be used.

An object of the present invention is to provide an electric wire insertion tool that effectively utilizes the cross section inside the pipe, allows smooth insertion, and prevents some electric wires from coming off.

[Means to solve the problem]

The electric wire insertion tool of the present invention includes a cylindrical receiving metal fitting having an outer diameter smaller than the inner diameter of the pipe into which the plurality of electric wires are inserted, one end of which is open, and the other end of which is provided with a hole;
a fastener to which a tension wire inserted into the receiving fitting and inserted through the hole is fixed; an inclined surface is provided on at least one of the outer periphery of the fastening fitting and the inner periphery of the receiving fitting; The ends of the plurality of electric wires are tightened between the inner periphery of the front plate and the inner periphery of the front plate.

[Effect]

Manually push the ends of multiple electric wires into the annular space between the outer periphery of the fastener and the inner periphery of the receiver, and tighten them toward the small diameter side of the inclined surface provided on either the fastener or the receiver. When the metal fitting and the receiving metal fitting are moved relative to each other in the axial direction, the electric wire is fixed in the annular space by the rusting action of the inclined surface. By passing the pull wire through the tube and then pulling the pull wire, the wire insertion tool consisting of a receiving fitting and a fastener to which the bundle of electric wires is fixed passes through the tube, and the bundle of electric wires can be inserted into the tube.

〔Example〕

FIG. 1 is a sectional view of Example 1, FIG. 2 is a sectional view of Example 2, and FIG. 3 is a sectional view of Example 3.

In FIG. 1, a cylindrical receiving fitting 2 having an outer diameter smaller than the inner diameter of the tube 1 is open at one end, has a hole 3 at the other end, and has an inclined surface 4 on its inner periphery. The outer periphery of the receiving fitting 2 may have a shape other than a cylinder, and if the other end is provided with a roundness 5, it can easily pass through the tube 1. A pull line 6 such as a wire that can be inserted into the hole 3
A spherical fastener 7 having a fixed thereon can be inserted into the receiver 2.

First, a plurality of electric wires 8 (8a, 8b, 8c) are manually pushed into the annular space between the inclined surface 4 on the inner circumference of the receiving fitting 2 and the outer circumference of the fastening fitting 7, and the tension wire 6 is inserted into the receiving fitting 2. When the electric wire 8 is pulled, the electric wire 8 is fixed between the inner periphery of the receiving fitting 2 and the outer periphery of the fastening fitting 7 due to the wedge action of the inclined surface 4. Then, by passing the pull wire from one end of the tube 1 to the other end and pulling it, the bundle of electric wires 8 can be smoothly passed through the tube 1 together with the wire insertion tool. By receiving one end of the receiving fitting 2 on a suitable stand and pushing the fastening fitting 7 through the hole 3 with a suitable rod, the bundle of electric wires 8 can be removed from the electric wire insertion fitting.

In addition, if a step 9 is provided at the back of the receiving metal fitting 2, the electric voltage can be removed by hand.
This will help you when pushing in the A8. Further, depending on the amount of electric wires 80 (the cross-sectional area of each electric wire and the number of electric wires), different diameters of the fasteners 7 are used. The fastener 7 may be a cylinder instead of a ball.

In the second embodiment shown in FIG. 2, one end is open and the other end has a hole 3.
The receiving fitting 22 with the step 9 has a cylindrical inner circumference, whereas the fastening fitting 27 has an inclined surface 4 on the outer circumference. The electric wire 8 is fixed between the large diameter side of the inclined surface 4 and the chamfered open end 22a of the receiving fitting 22 by a wedge action. Further, the receiving fitting 22 has a taper 10 between the step 9 and the hole 3, and the electric wire can be fixed even near the small diameter side of the inclined surface 4 and the taper 10. Taper 10 is used when the amount of electric wire to be used is small and the same fastener 27 is used and the wire cannot be fixed between the maximum diameter part of the fastener 27 and the opening 22a of the receiving metal fitting 22. At this time, taper 10 and inclined surface 4
It is fixed with.

As a more special method of use, the electric wire may be fixed between the inner cylindrical surface of the receiving fitting 22 and the maximum diameter part of the inclined surface 4 of the fastening fitting 27 by utilizing the elasticity of the electric wire coating. The amount of wire at this time has small tolerance values above and below a certain value.

The receiving fitting 2 having the inclined surface 4 shown in FIG. F and the fastening fitting 27 having the inclined surface 4 shown in FIG. 2 may be used in combination. At this time,
The step 9 may be omitted, the angles of both inclined surfaces 4 may be the same, or one of them may be larger.

In the third embodiment shown in FIG. 3, a female thread 33 is provided in the hole at the other end of the receiving metal fitting 32 whose inner periphery is a cylindrical surface, and a push rod 33a having a male thread to which the tension wire 6 is locked is screwed. It will be done.

A fastener 37 having an inclined surface 4 is located at the tip of the push rod 33a. When the push rod 33a is screwed in and the fastener 37 is pushed in the direction of arrow b, the electric wire 8 is fixed between the inclined surface 4 and the inner cylindrical surface of the receiving metal fitting 32, and is prevented from rotating by the nut 30b. In this case as well, the maximum diameter of the fastening fitting 37 and the receiving fitting 3
The wire 8 will not be fixed unless the amount of wire is small with respect to the annular space between it and the inner circumference of the receiving bracket 32. However, if a file-like portion 32a is provided on the inner circumference of one end of the receiving fitting 32, the wire will be fixed to some extent. Fixed even if the amount is small. By providing the file-like portion 32a with an inclination that increases in diameter from one end toward the back, and by making the diameter of the open end larger than the maximum diameter of the fastener 37, the fastener 37 can be installed inside the receiving metal fitting 32. Fixation is more secure and the range of amounts of wire that can be fixed is increased.

In Embodiment 3, enough electric wires are installed to almost fill the receiving fitting 37 with the ends of the electric wires almost aligned near the tip of the inclined surface 4, and the fastening fitting 37 is moved in the direction of arrow b via the push rod 30a. It can be pushed in and fixed, and as a result, the filling rate of the bundle of electric wires 8 into the tube 1 can be increased. When increasing the filling rate in FIG. 1 or 2, the maximum diameter of the receiving metal fitting is changed to a smaller one, but this is not necessary in the case of FIG. 3.

As an example of using the wire insertion tool, the work of inserting a control wire bundle of a switchboard into a 3 m pipe was shortened from 0.8 hours to 0.2 hours.

〔Effect of the invention〕

The electric wire insertion tool of the present invention includes a cylindrical receiving metal fitting having an outer diameter smaller than the inner diameter of the pipe into which the plurality of electric wires are inserted, one end of which is open, and the other end of which is provided with a hole;
a fastener to which a tension wire inserted into the receiving fitting and inserted through the hole is fixed; an inclined surface is provided on at least one of the outer periphery of the fastening fitting and the inner periphery of the receiving fitting; Since the ends of the plurality of electric wires are tightened between the wire and the inner periphery of the front plate, the wire bundle is firmly fixed to the tension wire by a wedge action, and the work of inserting the wire bundle into the pipe is smooth. It is reliable and has the effect of making effective use of the pipe internal cross section to increase the filling rate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of Example 1, FIG. 2 is a sectional view of Example 2, and FIG. 3 is a sectional view of Example 3.

Claims (1)

[Claims] 1) A cylindrical receiving fitting with an outer diameter smaller than the inner diameter of the tube into which multiple electric wires are to be inserted, one end of which is open and the other end provided with a hole, and the wires are inserted into this receiving fitting and inserted into the holes. a fastener to which a tension wire is fixed, an inclined surface is provided on at least one of the outer periphery of the fastener and the inner periphery of the receiving metal fitting, and the plurality of electric wires are provided between the outer periphery and the inner periphery of the front metal fitting. An electric wire insertion tool characterized by tightening the end of the wire.