JPH0436171Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] When working on a power transmission line by cutting off the current in a specific section, the line in that section must be grounded to prevent induced current from other circuits and other disturbances. I have to do it. The grounding wire is taken from a compression clamp holding the wire, and the present invention relates to a grounding fitting for connecting the grounding wire to the compression clamp.

[Prior art and problems] Upper and lower clamping pieces 1 that clamp a hexagonal compression clamp,
Japanese Utility Model Publication No. 58-36169 discloses a grounding connection fitting in which a connecting sleeve 5, in which a flat portion of one end is overlapped with one end of both clamping ends, is secured with a bolt 3.

Since the installation of these metal fittings requires work at high altitudes by leaning over the steel tower, it is desirable that the number of parts is small, installation is easy, and ground resistance is low.
It cannot be said that the number of parts of the known one is small. Further, in the structure in which the flat portion of the connecting sleeve is sandwiched between the clamping pieces, it is difficult to ensure perfect surface contact, and there is a risk that grounding resistance will increase.

[Means for solving the problem] The number of parts is reduced by extending one of the clamping pieces to integrally form the coupling part and the connection sleeve, and providing only the coupling part on the other clamping piece.

[Example] The drawings will be explained. Of a pair of clamping pieces 1 and 2 capable of gripping the compression clamp, the clamping piece 1 is integrally connected to a flat connecting portion 1a and a connecting sleeve 3. The clamping piece 2 includes only a connecting portion 2a. The end of the clamping piece 2 is bent so as to enclose more than half of the hexagon, and the clamping piece 1 is correspondingly formed so as to be able to contact two sides of the hexagon. The connecting portion 1a has the connecting portion 2.
A protrusion 4 is provided that can press the outer end of a. The centers of the joints 1a and 2a are tightened with a through bolt 5.

That is, the assembly is completed by simply holding the hexagonal part of the compression clamp between the clamping pieces 1 and 2 and tightening the bolt. The ground current of the clamping piece 2 flows reliably to the connecting sleeve 3 by the protrusion 4.

On the surface of the connecting portion 2a corresponding to the protrusion 4, three recesses 1b are provided on a circular arc centered on the bolt 5, divided into left and right sides. As a result, the protrusion 4 is in spherical contact with the recess, which provides sufficient electrical conduction and also serves for the angular positioning of the connecting sleeve. In order to avoid collision between the clamping piece 1 and the outer periphery of the compression clamp when the connecting sleeve rotates around the bolt, the corners of the clamping piece 1 are cut off and formed into wedge-shaped parts 1b. The chain line in FIG. 2 shows the state in which the connecting sleeve is rotated in one direction.

A device with the same purpose as this invention was published in 1983.
36169 is publicly known. Since three members, the engaging parts 1 and 2 and the gripping rod 5, are bolted together, it is not necessarily easy to work at heights. On the other hand, the present invention has two members, and since the clamping piece 2 therein encloses more than half of the hexagon, it will not easily come off even if the bolt loosens. In addition, a similar structure was developed in 1975.
-165766 is known, but this relates to a spanner and does not have a structure that allows ground current to flow. In contrast, in the present invention, one of the clamping pieces 1 and 2 has a protrusion 4 and the other has a recess 2b, and the engagement between the two ensures the grounding current. A feature of the present invention is that a grounding current can be reliably obtained using only two members.

[Effect] Since the number of parts is small, it is easy to assemble at high places. It is also possible to change the angle of the connection sleeve, in which case the resistance to ground current is low.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, and FIG. 2 is a plan view thereof. 1, 2... Holding piece, 1a, 2a... Joint part, 1
b... Wedge-shaped portion, 2b... Recess, 3... Connection sleeve, 4... Protrusion, 5... Bolt.

Claims (1)

[Scope of utility model registration request] In the upper and lower clamping pieces 1 and 2 that can hold a hexagonal compression clamp and have a flat joint part, the upper clamping piece 1
The connecting sleeve 3 is connected and integrated with the connecting sleeve 3, and the center of the joint is tied with a bolt.The lower clamp holding piece 2 has its ends bent so as to wrap more than half of the hexagon, and the upper clamp holding piece 1 corresponds to the two sides of the hexagon. A grounding connection fitting formed to be contactable and having a protrusion on one side and a recess on the other side so that they can engage with each other by relative rotation of both holding pieces.