JPH0436199Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a restraining clamp coupled to a power transmission line in order to secure the end of the power transmission line to a steel tower.
In particular, the present invention relates to an improvement of a metal wheel-passing type restraining clamp that is configured so that it can easily pass through a pulley called a safe attached to a steel tower for transmitting a power transmission line during power transmission line construction work.

In a metal wheel passing type restraining clamp, a jumper socket is installed to sandwich the aluminum sleeve connected to the power transmission line, and the tightening bolt is inserted into the bolt insertion hole of both to connect them. The stress associated with this causes the side surface of the cylindrical aluminum sleeve to curve inward. When the side surface of the aluminum sleeve is curved, a gap is created between the aluminum sleeve and the sandwiching part of the jumper socket, reducing the contact area and causing an oxide film to easily form on the surface of the gap, reducing current carrying performance. .

The present invention was developed by focusing on the above-mentioned problems of the conventional metal wheel passing type retaining clamp.The present invention was developed by creating grooves on the upper and lower parts of the aluminum sleeve along the flat surfaces on both sides that contact the clamping plates of the jumper socket. The object of the present invention is to solve the above-mentioned problems of the conventional method by providing such a structure that both side surfaces are deformed evenly and parallelly when the bolts are tightened.

Embodiments of the present invention will be described below with reference to the figures. The steel sleeve 1 is provided with a cylindrical portion 2 at one end into which a steel core S of a power transmission line is inserted and compressed and connected, and a handle 3 at the other end which is secured to a steel tower via an insulator link. In the intermediate portion of the steel sleeve 1, a plurality of bolt insertion holes 4 are arranged in a row in the longitudinal direction.

The aluminum sleeve 5 is cylindrical and can be inserted through the steel sleeve. One side of the aluminum sleeve 5 is
It has a cylindrical compression part 6 that is compressed and connected to the steel sleeve 1, and the other side has a flat surface 7 parallel to both left and right outer sides, and a plurality of bolt insertion holes corresponding to the bolt insertion holes 4 of the steel sleeve 1. 8, and four grooves 9 formed vertically and laterally symmetrically along the inside of the flat surface 7, forming a jumper socket coupling portion 10.

Jumper socket 11 has jumper wire J at the bottom.
It has a cylindrical part 12 for insertion and compression connection, and has a pair of clamping plates 13 on the upper part that are bifurcated from the upper end of the cylindrical part 12 and extend parallel to each other. The joint portion 10 of the aluminum sleeve 5 can be inserted between the holding plates 13, 13. A plurality of bolt insertion holes 14 corresponding to the bolt insertion holes 4 and 8 of the steel sleeve 1 and aluminum sleeve 5 are bored in the clamping plate 13.

Next, the action will be explained. This retaining clamp first inserts the steel core S of the power transmission line W into the cylindrical part 2 of the steel sleeve 1 and connects it by compression, then inserts the steel clamp 1 into the aluminum sleeve 5, and then With the handle 3 protruding from the end, the cylindrical compression part 6 is sequentially compressed from the tip side to be integrated with the power transmission line W and the steel sleeve 1. In this state, the power transmission line W is constructed, and after passing through the safe, the jumper socket 11 is connected. Jumper socket 11 has bolt 15
are inserted into the insertion holes 4, 8, and 14 and tightened with nuts 16 to be connected to the joint portion 10 of the aluminum sleeve 5. When the bolts and nuts 15, 16 are tightened, the clamping plates 13, 13 of the jumper socket 11 are sandwiched between them, and both flat surfaces of the aluminum sleeve joint 10 are pressed in opposite directions. Due to this pressure, the thin wall portion 9a at the bottom of the groove 9 is relatively easily deformed, and both flat surfaces 7,
7 are displaced inward while maintaining a parallel state to each other, and no curvature occurs. That is, if there is no groove 9, the top and bottom of the joint 10 will be thick, and a large reaction force against pressure from both sides will be generated there, causing the relatively thin and weak flat surface 7 to curve inward. However, in the case of the present invention, since the upper and lower parts of the joint part 10 are weakened by the grooves 9, the flat surface 7
Stress is applied evenly to the surface and no bending occurs. Also,
The bottom part of the groove 9 (thin wall part 9a), which has the highest strength against pressure from the left and right sides, is located closer to the bolt 15 than the upper and lower ends of the clamping plate 13, where the tightening force by the bolt 15 is the smallest. 15
When tightened, the thin portion 9a is relatively easily deformed inward, and the flat surfaces 7, 7 can be displaced in the approaching direction while maintaining their flatness and parallelism.

If a cut is formed instead of the groove 9, there is a disadvantage that rainwater enters through the cut after installation, corrodes the inside, and tends to deteriorate the electrical characteristics.

As explained above, in this invention,
The aluminum sleeve 5 has parallel flat surfaces 7, 7 on both left and right sides of the joint 10 for tightly contacting the holding plates 13, 13, and is located at symmetrical positions vertically and horizontally.
It has four grooves 9 that are cut parallel to the flat surface 7 and extend in the axial direction in parallel thereto, and the bottoms of the grooves 9 are each at a position below the upper end of the flat surface 7 or at the lower end. Since the clamping plates 13 and 13 of the jumper socket 11 are tightened with the bolts 15, the clamping plates 1
When the flat surfaces 7, 7 are pressed by 3, 13, the thin part 9
a is relatively easily deformed inward, and is slightly displaced in the approaching direction while maintaining the flatness of the flat surfaces 7, 7 and the mutual parallel state. Therefore, the flat surfaces 7, 7 are the bolts 1
There is no risk of the bending occurring near the penetration portion of 5 and causing poor contact with the holding plates 13, 13. In addition, the groove 9
Since the bottom is flat and does not penetrate inside or outside of the aluminum sleeve 5, it has the effect of preventing rainwater from penetrating into the aluminum sleeve 5 and causing corrosion.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the retention clamp, Figure 2 is a sectional view of the joint of the aluminum sleeve, Figure 3 is a front view of the retention clamp in a connected state, and Figure 4 is a sectional view taken along the line shown in Figure 3. . 1... Steel sleeve, 2... Cylindrical part, 3... Pull, 4... Bolt insertion hole, 5... Aluminum sleeve, 6... Cylindrical compression part, 7... Flat surface, 8... Bolt insertion Hole, 9...Groove, 10...Joining portion, 11
... Jumper socket, 12 ... Cylindrical part, 13 ...
...Holding plate, 14... Bolt insertion hole, 15... Bolt, S... Steel core, W... Power transmission line.

Claims (1)

[Claims for Utility Model Registration] A cylindrical part 2 for inserting and compressing the power transmission line W is provided at one end, a pull 3 is provided at the other end to be secured to the tower via an insulator chain, and the middle One side has a steel sleeve 1 with a bolt insertion hole 4, one side has a cylindrical compression part 6 for inserting and compressing the steel sleeve 1, and the other side has a bolt of the steel sleeve 1. An aluminum sleeve 5 is provided with a connecting part 10 having a bolt insertion hole 8 corresponding to the insertion hole 4, a cylindrical part 12 is provided at the lower part for inserting the jumper wire for compression connection, and a cylindrical part is provided at the upper part. A pair of parallel clamping plates 13 are provided which branch into two and extend from the aluminum sleeve 5 and have a bolt insertion hole 14 corresponding to the bolt insertion hole 8 of the aluminum sleeve 5. and a jumper socket 11 configured to tighten the joint part 10 of the aluminum sleeve 5 with bolts 15 passed through the bolt insertion holes 14, 8, 4 along both sides of the joint part 10, the aluminum sleeve as described above. The connecting portion 10 of No. 5 has parallel flat surfaces 7 on both left and right sides for closely contacting the holding plates 13, and is cut parallel to the flat surfaces 7 at symmetrical positions vertically and horizontally. A metal wheel having four grooves 9 extending in the axial direction, and the bottoms of the grooves 9 being located below the upper end of the flat surface 7 or above the lower end, respectively. Pass-through type retaining clamp.