JPS6329489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the reverse compression method for retaining clamps.

Wires that are compressed and connected using retaining clamps are prone to the laughing phenomenon. This is because when the aluminum clamp is compressed, the electric wire under the aluminum clamp also stretches in the same direction.
This is larger in the outer layer wire closer to the clamp than in the inner layer closer to the steel core.

Therefore, by performing compression work in reverse from the tapered side of the tip of the clamp (generally, the conventional method is called the forward compression method, and this method is called the reverse compression method), it is possible to However, the problem with this construction method is ensuring that the steel clamp and aluminum clamp are in close contact with each other.

If compression is completed in an incomplete state without tight contact, moisture will be allowed to infiltrate through the gap, leading to destruction of the clamp due to freezing, etc.

The present invention aims to provide a novel decompression method that can always perform decompression in the above-mentioned close contact state.

Examples will be explained below with reference to the drawings. Figure 1 shows the steel core wire 2 of the electric wire 1 and the steel clamp 4.
After fixing, the aluminum clamp 3 is covered and the required distance S is secured. This distance S is selected so that the end face of the aluminum clamp can appropriately contact the end face of the flange of the steel clamp at the end of reverse compression. At this time, it is possible to set the distance S regardless of the level of skill by attaching the gauge 10 having the dimension S' in Figure 2, which is equal to the required distance S, and ensuring that the required distance S can be maintained. Become.

Therefore, if the first preliminary compression operation is performed in this state, the aluminum clamp 3 will extend by a slight length W in the direction of the collar 5 of the steel clamp 4, thereby increasing the distance S.
-W<S, and the spring 11 has contracted by this amount.

Next, the main compression work is performed, but the aluminum clamp 3 and steel clamp 4 are separated by the first preliminary compression work.
will be fixed and will not come off at this point. Therefore, this gauge 10 will be removed during the second and subsequent main compression operations.

After that, the main compression work is performed to completely complete the compression. In this state, the steel clamp 4 and the aluminum clamp 3 are in close contact with each other at their end faces, allowing reliable compression. In the figure, 12 is a fixing piece to the flange 5 of the steel clamp of the gauge 10 , and 13 is an abutting piece to the same aluminum clamp 3.

Note that the spring piece does not necessarily need to be made of metal, as it only needs to contract elastically, and may be made of something like rubber.

Using the method of the present invention, no skill is required and reliable decompression can be performed at all times.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the setting situation before compression in the construction method according to the present invention, and FIG. 2 is a sketch diagram showing one embodiment of the gauge. 1... Electric wire, 2... Steel core wire, 3... Aluminum clamp,
4... Steel clamp, 5... Flange, 10 ... Gauge, 11
...Spring piece, 12...Fixing piece, 13...Abutment piece.

Claims (1)

[Claims] 1. When reversely compressing the retaining clamp from the tip side of the aluminum clamp, the aluminum clamp is secured to the flange at a distance S such that the end face of the aluminum clamp can comfortably contact the flange end face of the steel clamp when the reverse compression is completed. The aluminum clamp and the steel clamp are set using a gauge consisting of a fixing piece that contacts the end face of the aluminum clamp, a contact piece that contacts the end face of the aluminum clamp, and a spring piece that bridges the gap between them. After pre-compressing the aluminum clamp, the gauge is Reverse compression method for retaining clamps that can be removed and compressed.