JPS5910887Y2 - Crimp twist prevention fittings - Google Patents

Description

[Detailed Description of the Invention] Electric wires are tied to steel towers using tie-down clamps, and the present invention relates to a clamping fitting for preventing twisting during crimping work to facilitate the work of attaching the tie-down clamps.

Before moving on to the explanation of this metal fitting, first, the installation work of the retaining metal fitting and the location of the problems will be explained with reference to the drawings.

The retaining clamp consists of a steel sleeve 1, an aluminum sleeve 2,
Remove from jumper socket 3.

The steel sleeve 1 has an axial hole 1a formed at one end of the rod-like body, and a plate-shaped retaining portion 1b at the other end.

The aluminum stranded wire at the end of the electric wire E is cut off to expose the steel core wire e, which is inserted into the hole 1a and crimped.

The aluminum sleeve 2 is cylindrical and has flat surfaces 2a on both sides of its outer circumference.

This aluminum sleeve has been inserted into the electric wire E in advance, but after shifting it to a position where it straddles the electric wire E and the steel sleeve 1 as shown in Figure 1, it is compressed from the left end to the right in the same figure. Overlap.

The reason for compressing in this direction is to prevent the wire from bulging (commonly known as bulging) at the mouth of the aluminum sleeve.

This compression causes the aluminum sleeve to expand to the right in the figure, but at this time, twisting inevitably occurs along the twist angle of the inserted aluminum strands.

The retaining clamp integrated as described above holds the plate-shaped retaining portion 1b of the steel sleeve vertically to the steel tower.

The jumper socket 3 has a clevis 3a, into which the flat surface 2a of the aluminum sleeve is inserted and bolted.

The compression twist of the aluminum sleeve described above is governed by several conditions, so the amount of twist occurring is indefinite.

Now, at the time when aluminum sleeve compression starts, retaining part 1
Suppose that b and the flat surface 2a are parallel, but the angular phase of the two is twisted as shown in FIG. 5 due to compression torsion.

In this case, the jumper socket, which should be oriented vertically downward, tilts to the side, and the jumper wire connected to it also deviates from its normal oriented position.

There is also the risk of contact with adjacent components due to strong winds, etc.

The present invention uses a prevention fitting to prevent the aluminum sleeve from twisting when compressed, and allows the jumper socket to accurately point vertically downward after being tied to the steel tower.

The prevention fitting of the present invention has U-shaped bent sides 5 and 6 at both ends of the base side 4, as shown in Fig. 3, and the new curved side 5 has a flat surface 2.
A vertical notch 5a into which part a can be inserted is provided, a vertical window 6a into which the plate-shaped retaining part 1b can be inserted is provided on the bent side 6, and a long window 4a is provided on the base side 4.

The vertical window 6a may be a notch. This prevention fitting is
Before compressing the aluminum sleeve, the bent side 5 is engaged with the flat surface portion 2a and the bent side 6 is engaged with the retaining portion 1b as shown in FIG. 4.

Restricted by both bent sides, the aluminum sleeve extends without twisting, and the degree of elongation can be detected by the long window 4a.

After the compression is finished, this metal fitting will be removed, but the relationship at that time will be the 6th one.
It will look like the figure.

Conventionally, there was no suitable means for correcting the twist after crimping, and this involved extremely troublesome correction work, but the present invention is characterized by completely solving this problem by using simple metal fittings.

[Brief explanation of the drawing]

Figure 1 is a front view of the retaining clamp, Figure 2 is a side view of the jumper socket, Figure 3 is a perspective view of the present invention, Figure 4 is an explanatory diagram of the present invention in use, and Figures 5 and 6 are the retaining part and It is a phase explanatory diagram of a flat surface. 1... Steel sleeve, 1a... Hole, 1b
・・・・・・Retaining part, 2・・・・・・Aluminum sleeve,
2a... Flat surface, 3... Jumper socket, 3a... Clevis, 4... Base side, 4a... Long window, 5 ...Bent side, 5a
...notch, 6...bent side, 6a...
... Vertical window, E ... Electric wire, e ... Steel core wire.

Claims (1)

[Scope of utility model registration request] It has a U-shape with bent sides at both ends of the base, one bent side has a vertical notch into which both flat parts of the aluminum sleeve can be inserted, and the other bent side has a steel sleeve plate. A fitting for preventing crimp twisting of a retaining clamp, which is provided with a narrow vertical window into which a shaped retaining part can be inserted, and a long window on the base side through which the movement of the end of the aluminum sleeve can be visually observed.