JPS6013229Y2 - BD cable support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp for supporting a beaten cable, that is, a cable integrally coated with a synthetic resin with the self-supporting stranded steel wire and cable core part parallel to each other.

When clamping and supporting a BD cable whose steel strands and cable core are covered with synthetic resin, the outer resin coating of the clamping part near the end of the clamp may tear or crack, leaving the steel strands exposed. There is a drawback.

In addition, there is a drawback that the workability is poor when attaching the clamp to the BD cable.

The present invention eliminates this drawback.The outside of the BD cable is wrapped with a wrapping band covered with soft synthetic resin, and the lower end of the clamp is held from the outside of the wrapping band, and the clamp is clamped. The purpose of this is to tighten and support the upper end of the cable with bolts to prevent damage to the cable sheath.

Another object of the present invention is to provide a clamp that can commonly manufacture both metal plates of a BD cable and a steel stranded wire using one mold, which clamps both sides between the cable and the steel stranded wire at their tips. It is in.

Other objects, configurations, functions, and effects of the present invention will be explained with reference to drawings of embodiments.

The diagram mainly shows clamps used for erection.
The vertically long metal plates 1 and 1' are made of the same mold to have the same shape, and as shown in FIG. 2, two pieces of the same structure are used together.

A circular hole 3 into which a hanging bolt 2 is inserted is formed in the upper center of the metal plates 1 and 1', and a square hole 11 into which a square clamp bolt 4 is fitted is formed below the circular hole 3.

Reference numeral 6 indicates a notch provided at the upper end of the metal plates 1 and 1', and 7 indicates a protrusion provided on one side of the metal plate 1 and 1' respectively. The projection 7 of the metal plate 1' is fitted into the recess 6 of the metal plate 1, and the projection 7 of the metal plate 1 is inserted into the recess 6 of the metal plate 1.
The recess 6 and the protrusion 7 are provided symmetrically so as to be fitted into the recess 6 of '.

A horizontal semicircular groove 8 is provided at the lower inner edge of each of the metal plates 1 and 1'.
, and several thin recesses 9 are carved on the inner surface of the semicircular groove 8 at an angle of inclination with respect to the horizontal axis.

A square shaft 10 is provided at the base of the square bolt 4, and this square shaft 10 is fitted into the square holes 11 of the metal plates 1 and 1', and a nut 13 is screwed into the threaded portion of the square bolt 4 through the seat plate 12. .

In addition, a nut 14 is screwed onto the threaded part of the hanging bolt 2, and the BD is tightened using the semicircular grooves 8 and 8 of the metal plates 1 and 1'.
To prevent stranded steel wires 15 of a cable from coming off from a clamp constituted by two metal plates.

The clamp constructed in this manner will be referred to as clamp A.

Figure 4 shows a wrapped band that does not interfere with the radiated electromagnetic waves of a radiating coaxial cable, etc. It is made by braiding a long band of high tensile strength fibers such as insulator fiber or strong human silk, and then adding synthetic resin to this. The material is permeated to form a long rolled tape, which is then cut to an appropriate length to form a band 15, with cut ends at 16° and 16' at both ends.

5A, B, and C show a rectangular metal plate 17 made by cutting a thin metal strip such as a stainless steel strip to an appropriate length, and a rectangular metal plate 17 with a cross section suitable for fitting into this metal plate 17. As shown in No. 6, the soft synthetic resin plate 18 has both edges folded back in a U-shape to wrap around the longitudinal side edges of the rectangular metal plate 17.
7 is fitted as a wrapping band 19, and both ends thereof are cut ends 20 and 20'.

The soft synthetic resin plate 18 prevents the metal plate 17 from directly contacting the cable sheath and damaging the cable sheath, and also provides an electrical insulation effect.

For cables that radiate electromagnetic waves, such as radiation leakage cables, avoid using metal for the wrapping band 19, and select cotton or glass fiber objects such as the wrapping band 15 that do not interfere with the radiated electromagnetic waves.

Assembling method As shown in Figure 2, first place the synthetic resin plate 18 at the center of the wrapping band 19 under the BD cable core, and then wrap one end 20 of the self-supporting steel stranded wire so as to wrap the BD cable. Wrap it around the top of the coating until the tip reaches the center of the core wire of the BD cable.

Next, the other end 20' is wrapped over the wrapping band 19 in the same manner as described above.

After wrapping the wrapping band 19, loosen the nut 14 of the bolt 2 of the clamp A, open the semicircular groove 8, and tighten the wrapping band 19 from above.
Tighten the outer wrapping band 19 of the steel stranded wire portion of the cable from both sides so as to hold it in the groove 8, and then tighten the end portion 8a of the groove 8.
, 8a' gradually enters the thin neck part C of the boundary between the steel stranded wire part of the BD cable BD and the cable core part, and the upper part of the steel stranded wire part of the winding band 19 crosses over the entire cable. It is strongly tightened along the outer shape of the cable, and the wrapping band 19 is tightly tightened along the outer shape of the cable.

The clamp A also integrally supports the core wire portion of the BD cable BD via the wrapping band 19.

Originally, in BD cable, the cable core part and the self-supporting steel strand part were coated together, and both were connected by a part of the resin coating at the small width of the contact point between the large circle and the small circle. Even when spanning electric lines with long distances between columns, the steel strands are supported only at the edges of the columns, so large loads are concentrated at the support points and the core wires are not pushed outward. The force of being pushed out is added,
A force that appears to tear the cable core and steel strands apart is applied.

Therefore, distortion gathers near the corners of the support hardware at the support point,
If the outer sheath of the BD cable is torn or cracked, the steel strands may fall out, or water may seep into the core wire through the tear, causing a core wire accident.

In this invention, the cable core part and the steel stranded wire part are integrally connected by a wrapping band, so the load applied to the cable is applied to the clamp through the wrapping band, and the load applied to the cable is applied to the clamp at the connection between the core part and the steel stranded part. Accidents such as breakage of the outer skin can be reliably prevented.

In addition, the present invention, which allows a very small diameter and lightweight cable to be directly supported with a clamp without using a wrapping band, is a method of supporting the lower ends of metal plates of the same shape and facing each other that constitute the clamp as described above. Half-moon-shaped grooves were formed horizontally on the inner surface of the BD cable, and several thin recesses were carved in these half-moon grooves at an inclined angle. The stranded wire can be securely gripped without slipping and the outer skin of the stranded steel wire will not be damaged by the clamp.

In addition, the upper end of the metal plate is divided into two parts at the center, a protrusion piece is provided on the left side of the protrusion piece, and a groove-like recess is provided on the right side of the protrusion piece, and the two metal plates are interlocked with each other in an uneven shape. There is no shift in the vertical direction, and two metal plates can be molded with one mold, which simplifies the manufacture of molds and fittings, making them suitable for mass production and inexpensive.

In addition, a square hole is formed in the center of each of the two metal plates,
Insert square bolts into these square holes and fit the square shaft formed at the base of the square bolt into the square hole of one metal plate.
When a nut is screwed onto a square bolt and the outside of the steel stranded wire part of the cable is tightened using the semicircular grooves of both metal plates, the square bolt does not rotate on its own axis and only the nut quickly rotates, causing both metal plates to tighten. Capable of holding stranded steel wires stably and strongly.

In addition, since the two metal plates were configured to have circular holes in their upper parts so that the hanging bolts could be inserted into these circular holes and tightened with nuts, the recesses and protrusions on the upper ends of both metal plates could be engaged with each other. The BD cable can be suspended by tightening the mating square bolts and holding the stranded steel wires in the half-moon grooves at the bottom ends of both metal plates, then loosening the nuts of the suspension bolts. During this time, the two metal plates holding the steel strands will not shift or come off.

In addition, since the BD cable is protected by a synthetic resin plate wrapped around the wrapping band, the wrapping band does not wrap directly around the BD cable, and has advantages such as not leaving any scars on the outer circumferential surface of the BD cable. It has a positive effect.

[Brief explanation of drawings]

Figure 1A is an outer circumferential view of one metal plate, Figure 1B is a side view of the same, Figure 1C is an inner side view of one metal plate, Figure 2 is a front view of the clamp, and Figure 3A. is a front view of the square bolt, Figure 3B is a side view of the same as above, Figure 4 is a front view of the rectangular metal plate, and Figure 5 is a front view of the square bolt.
Figure A is a front view of a rectangular metal plate covered with a soft synthetic resin plate, Figure 5B is a left side view of the same, and Figure 5C is a right side view of the same. 1.1'...Metal plate, 2...Bolt,
3...Circular hole, 4...Square bolt, 6...
...Concavity, 7...Protrusion, 8...
Semicircular groove, 9... recess, 10... square shaft, 11... square hole, 12... seat plate,
13.14...Nut, 15...Band, A...Clamp, BD...BD cable, C...Narrow neck, D... Steel stranded wire,
16, 16'... Cut end, 17... Rectangular metal plate, 18... Synthetic resin plate, 19...
... Wrapped band.

Claims (1)

[Scope of utility model registration request] The metal plates 1 and 1' have the same overall shape and dimensions, and these metal plates 1 and 1' are provided with a recess 6 at the upper end and a protrusion 7 symmetrically between the upper end and the side. Drill a circular hole 3 in the upper center part through which the hanging bolt 2 will be inserted.
A square hole 11 is drilled in the lower part into which the rectangular shaft 10 of the square bolt 4 for clamping is inserted, and a semicircular groove 8 is formed in the lower end in which several thin recesses 9 are carved in the horizontal direction at an angle of inclination to the horizontal axis. Formed and having the same overall shape and dimensions 2
It consists of two metal plates 1 and 1', and a wrapping band 19 made of a metal plate 17 covered with a snake-shaped soft synthetic leather resin 18 that surrounds the outer periphery of the BD cable BD and the steel stranded wire 15. Both ends of the metal plate 17 surrounding the BD cable BD are superimposed and suspended on the steel stranded wire 15 via the soft synthetic resin 18, and the metal plates 1 and 1' are held together and the steel is wrapped in the semicircular grooves 8 and 8. The stranded wire 15 is held around the outer surface of the metal plate 17, the square shaft 10 of the square bolt 4 is fitted into the square hole 11 of the metal plate 1, the nut 13 is screwed onto the square bolt 4, and the suspension bolt 2 is inserted into the circular hole 3. The BD cable support device is formed by inserting the BD cable through the BD cable and screwing the nut 14.