JPH0314912Y2 - - Google Patents

Description

[Detailed description of the invention] (A) Industrial application field The present invention relates to a protective fitting for a power distribution lead-in line.

(B) Conventional technology Conventionally, power distribution service lines were retained by hooking a retaining hook with a bindless insulator on a ring hardware installed in a house, and wrapping the service line around the bindless insulator. was.

However, in the winter, when abnormal tension is applied to the service line due to snow falling from the roof or a car hitting a utility pole, there are problems such as the line breaking.

(C) Problems that the invention aims to solve As shown in Figure 3, this invention prevents abnormal tension from being applied to the service line due to falling snow, etc. by inserting and attaching it between the retaining hook and the ring hardware. In this case, the drop-in wire protection fitting of the present invention operates to relieve the abnormal tension and prevent the drop-in wire from breaking.

(D) Means for solving the problem As shown in Figs. 1 and 2, a pipe has a narrow mouth part 2 with a retaining ring 1 on one side and a threaded part 3 in the other narrow mouth part. A hook 7 formed with an enlarged threaded part 5 at one end and a retaining ring 6 at the other end is screwed into the narrow mouth part 2 of the shaped main body 4 through the threaded part 3. and connect with loose fit.
With the hook 7 inserted deeply into the pipe-shaped main body 4, a predetermined break is made in the breaking rivet hole 8 provided near the base of the enlarged screw portion 5 of the hook 7 and in the breaking rivet hole 9 of the pipe-shaped main body 4. It has a structure in which a strong breaking rivet 10 is inserted and riveted.

In addition, in order to loosely connect the hook 7 to the pipe-shaped main body 4, the enlarged threaded part 5 of the hook 7 is screwed into the threaded part 3 of the narrow mouth part 2, and the enlarged threaded part 5 is inserted into the pipe-shaped main body 4. The enlarged screw portion 5 is passed through the screw portion 3.
and the bottom of the pipe-like main body 4,
It has a structure in which it is hooked onto the screw part 3 and does not come off, and when the hook 7 is deeply inserted into the pipe-shaped body 4 as shown in FIG. It is sewn and riveted with 10 rivets.

In addition, in FIGS. 1 and 2, the retaining ring 1 is a closing ring and the retaining ring 6 is an open ring, but they can be reversed if necessary.
Both retaining rings 1, 6 can be closed rings or open rings.

Furthermore, the breaking strength of the breaking rivet 10 is selected in advance to a value that takes into consideration the breaking strength of the applied lead-in line and the safety factor. For example, it breaks at the required tensile strength.
Use rivets such as copper wire that have the hardness and required diameter.

Next, the rivet head portion of the breaking rivet hole 9 can be covered with a heat shrink tube or the like, if necessary, to prevent rainwater from entering into the pipe-shaped main body 4.

(E) Function As shown in Fig. 3, the service wire protection fitting 13 of the present invention shown in Figs. Ring 1 has bindless insulator 1
4 is attached, and a lead-in line 16 is wound around the bindless insulator 14 to hold it.

In this case, the tension of the lead-in wire 16 is always supported by the breaking rivet 10.

While the service line is being held in place in this manner, for example in winter, if snow from the roof falls onto the service line 16 and abnormal tension is applied to the service line, the abnormal tension will be applied to the service line 16 as shown in Figure 1. 1 and 6, but if the tension is greater than the set breaking strength of the breaking rivet 10, the breaking rivet 10 will break and the hook 7 will move as shown by the two-dot chain line in FIG.
It comes out of the pipe-like main body 4, and the enlarged screw part 5 hooks on the thread part 3 of the pipe-like main body 4, and the lead-in line is held in that state. In this case, by adjusting in advance the length of the hook 7 to be pulled out from the pipe-like main body 4 to a length that can absorb the abnormal tension applied to the electric wire due to falling snow, etc. Absorbed by
Alternatively, it is possible to prevent the ring hardware 12 from being pulled out from the wall of the house.

(F) Effect of the invention As mentioned above, the service wire protection fitting 13 of the invention
In advance, attach the ring hardware 12 and the retaining hook 15 of the house.
By inserting it in between, if abnormal tension is applied to the lead-in line 16 due to falling snow from the roof, etc.
The breaking rivet 10 is broken, the hook 7 is pulled out, the abnormal tension applied to the service line 16 is alleviated, the service line is prevented from breaking, and electricity can be supplied without power outage.

Alternatively, it is possible to prevent the ring hardware 12 from being pulled out of the house wall and damaging the house wall.

Furthermore, if a color display such as red is attached to the inner part of the pipe-shaped main body 4 of the hook 7 in advance, the red display will appear when the breaking rivet 10 breaks. This makes it easy to check whether the wire is working or not, and to easily replace the drop-in wire protection metal fitting, and the recovered drop-in wire protection metal fitting can be used as many times as necessary by replacing the breaking rivet 10.

Further, the drop-in wire protection fitting can be easily applied to drop-in wires of various wire diameters by using breaking rivets 10 having breaking strength suitable for each lead-in wire diameter.

As described above, the service line protection fitting of the present invention has a simple structure and can economically protect service lines from disconnection.
This prevents damage to the wall of the house due to the removal of the ring hardware 12.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory views showing a partial cross section of the present invention, and FIG. 3 is an explanatory view of the present invention in use. 1 is a ring for retaining the pipe-shaped main body 4, 2 is a narrow opening thereof, 3 is a screw part in the narrow mouth part 2, 4 is a pipe-shaped main body, 5 is a large screw part of the hook 7, and 6 is a retaining ring for the hook 7. 7 is a hook, 8 is a rivet hole for breaking the hook 7, 9 is a rivet hole for breaking in the pipe-like body 4, 10 is a rivet for breaking, 11 is a heat shrink tube, 12 is a ring hardware, 13 is a lead-in wire protection metal fitting. , 14 is a bindless insulator, 15 is a retaining hook, and 16 is a lead-in wire.

Claims (1)

[Scope of utility model registration request] A narrow mouth part of a pipe-like body having a narrow mouth part with a retaining ring on one side and a threaded part in the other narrow mouth, an enlarged twisted part on one end, and a retaining ring on the other end. A hook formed of a pipe-shaped body is screwed into the large threaded part of the hook and connected loosely, and when the hook is inserted, the part near the base of the large threaded part of the hook is connected to a pipe-shaped body having a predetermined breaking strength. A drop-in wire protection fitting made by riveting.