JPH0246188Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention can temporarily untwist a plurality of twisted cables. Regarding a cable untwisting tool.

When multiple cables are used by passing them through a conduit installed underground or in a building, each cable is loosely twisted. It is necessary to waterproof the open end of the pipe, that is, the pipe mouth, and this waterproofing is carried out by fitting a rubber waterproofing device as shown in Japanese Utility Model Publication No. 56-38894. When fitting the waterproof device, the cable must be untwisted in order to pass through the hole.

(Prior art) For example, when untwisting a three-strand cable, a conventional untwisting tool surrounds the cable with three bands formed in a chevron shape with a semicircular arc surface that matches the diameter of the cable. Then, tighten the flanges at both ends of the adjacent bands with bolts and nuts, fit the pipe into the pipe holder protruding from the top of the chevron, and use this pipe to rotate the band to untwist the cable. was.

(Problems to be solved by the invention) Conventional untwisting tools as described above have a large number of parts, are complicated to attach to and remove from the cable, and are difficult to handle.Also, the untwisting operation requires the rotation of the cable and the fitting of the pipe. It was necessary to change the alignment position while doing this, and the work efficiency was poor if it was done inside a narrow manhole.

(Means for solving the problem) The untwisting tool of the present invention is a clamping piece formed by extending flat parts from both left and right sides of a curved part into which a twisted cable is fitted, and opening holes in both flat parts. and an operating rod that can be inserted in series through both through holes of the holding piece.

(Function) When the clamping piece pinches the cable from around the cable, and a rotational force is applied to one end of the operating rod fitted into the through hole of the clamping piece, the clamping piece rotates around the cable, and the clamping piece rotates around the cable. The cable integrated with the piece is also rotated to untwist the cable.

(Example) A case where the untwisting tool according to the present invention is used for a three-stranded cable will be described with reference to the drawings.

The clamping piece 1 of the untwisting tool consists of a curved surface part 2 at the center into which the twisted cable is fitted, and both flat parts 3 extending from both sides of the curved surface part 2. The inner surface of the curved surface portion 2 is formed by connecting three curved surfaces 5a, 5b, and 5c each having an arcuate surface corresponding to the diameter of the cable 4. Rectangular through holes 6 are opened in the left and right flat parts 3. The flat part 3 is thicker than the curved part 2, and a reinforcing rib 7 is provided in the center of the outer surface of the curved part 2 in a band-like manner. The clamping piece 1 as described above may be manufactured by integral molding as an aluminum casting.

The untwisting tool of the present invention includes the above-mentioned clamping piece 1,
It consists of an operating rod 8 that passes through the through hole 6 of both flat parts 3.
The operating rod 8 is a rectangular pipe, each side of which coincides with each side of the through hole 6 of the clamping piece 1, and one tip of the operating rod 8 is crushed, for example, to form a wide portion 9, and the operating rod 8 It serves as a stopper when passed through the through hole 6, while the other end remains as it is and serves as a pressurizing part 10. The material of the operating rod 8 may be a square steel pipe for general construction.

When the operating rod 8 is made of a square pipe, the operating rod 8 and the cable 4 come into surface contact, which has greater friction than wire contact using a round bar, making it easier to untwist the cable. 8 does not rotate, making it easy to apply manual force.

In addition, the cable 4 and the curved surfaces 5a, 5b of the curved surface portion 2,
For example, a rubber sheet 11 made of chloroprene may be sandwiched between the curved surface 5c and the curved surface 5c as a cushioning material.
It is also possible to attach it to a, 5b, and 5c. In addition, the shape of the clamping piece 1 is determined by the shape of the cable 4 to be used.
For example, in the case of a four-strand cable, the curved portion may be made into a gate shape.

In order to untwist a cable using the untwisting tool of the present invention, a rubber sheet 11 is placed around the cable 4 extending from the conduit opening 13 of the conduit 12, and a clamping piece is placed around the outer periphery of the rubber sheet 11. 1,
The cable 4 is fitted inside the curved surface part 2. Then, the pressurizing part 1 is inserted into each through hole 6 of both flat parts 3, 3 of the clamping piece 1.
Insert the operating rod 8 in series from 0 and push it in until it locks at the wide part 9. Then, the pressurizing part 10 of the operating rod 8
Manually apply rotational force in the direction opposite to the twisting of the cable. As a result, the holding piece 1 rotates around the cable, and each cable is gradually untwisted. When it becomes difficult to apply force to the operating rod 8, slide the operating rod 8 in the length direction to position the pressurizing part 10 near the through hole 6, and apply force near the wide part 9. You can continue the rotation work in the same way. Once the cable is untwisted, turn the operating lever 8.
It is only necessary to pull out the clamping piece 1 from the through hole 6 of the clamping piece 1 and remove the clamping piece 1 from the cable 4, and the removal is extremely easy. The cable thus untwisted is fitted with a waterproofing device as described above to waterproof the conduit opening.

(Effects of the invention) The untwisting tool of the invention has a small number of parts.
Easy to manufacture and highly economical. Furthermore, it is extremely easy to attach and detach from the cable, and the untwisting operation is also easy. Furthermore, there is no need to change the operating rod according to the rotation of the cable, making it highly workable even in narrow manholes.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the untwisting tool of the present invention fitted to the cable, Fig. 2 is a perspective view of the clamping piece,
FIG. 3 is a front partial sectional view of the clamping piece. DESCRIPTION OF SYMBOLS 1... Holding piece, 2... Curved surface part, 3... Flat part, 6
...Through hole, 8...Operation rod.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A clamping piece with flat parts extending from both left and right sides of a curved part into which the twisted cable is fitted, and through holes opened in both flat parts, and both sides of the clamping piece. A cable untwisting tool consisting of an operating rod that can be inserted into a series of through holes. (2) The cable untwisting tool according to claim (1), wherein the through hole is a square hole and the operating rod is a square rod.