JPH0747945Y2 - Rising cable protection tube cap - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to an improvement of a cap attached to an upper end portion of a cable protection tube rising upward along a utility pole, a steel tower, etc. to prevent rainwater and stones from entering the inside. is there.

[0002]

2. Description of the Related Art A conventional cap of this type has a lower wide-shaped crown (head) which is cut at a portion corresponding to the outer diameter of a cable to form a cable outlet, and the upper end of the cable protection tube is entirely circumscribed. It is composed of an open (vertical split) type or non-open type tubular body having a skirt portion that is externally inserted in the state, and generally, after being attached to the upper end portion of the cable protection tube via the skirt portion, the cable outlet port A gap between the cable and the cable is filled with a soft filling material such as putty and foam compound to completely prevent rainwater from entering.

[0003]

As described above, in the conventional cap, the entire skirt portion circumscribes the upper end portion of the cable protection tube, and the gap between the cable outlet portion and the cable portion is filled. As the product is filled, the cable protection tube is substantially sealed.

On the other hand, the temperature of the cable, including the cable sheath, rises due to the load (current) current, and the temperature of the air inside the cable protection tube also rises and tends to expand.

However, since the cable protection tube is substantially sealed as described above, the internal air is compressed and the temperature thereof is further increased. Particularly in the daytime, the load current is large and the effect of solar radiation is also added, so that the temperature rise of the air in the cable protection tube is further increased. As a result, there is a problem that the allowable current of the cable is reduced and the deterioration of the cable is promoted.

In view of the above problems, the present invention is
The purpose is to suppress the rise of the temperature of the air in the cable protection tube without substantially lowering the effect of preventing rainwater from entering.

[0007]

According to the present invention, the above object is achieved in a cap having a tubular body having the above-described widened crown portion and a skirt portion circumscribing the cable protection tube. This is achieved by providing the inner peripheral portion of the portion with a recess capable of forming a gap between the cable protection tube and the inside and outside of the cable protection tube.

[0008]

In the cap of the present invention, the air inside and outside the cable protection tube freely flows through the recess provided in the inner peripheral portion of the skirt portion. Therefore, the temperature rise of the air in the cable protection tube can be suppressed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention are shown in the drawings.

In the illustrated example, an opening (vertical division) having a plurality of downwardly wide crown portions 12 and skirt portions 13 in the upper and lower axial directions and having overlapping end portions in the direction around the axis so that they can be opened. The present invention is applied to a cap 11 made of a cylindrical body of a mold, and a protrusion 14 for circumscribing a cable protection tube 16 is provided on the inner peripheral portion of the skirt portion 13 at substantially equal intervals around the axis. A plurality of recesses 15 that are not circumscribed by the cable protection tube 16 are provided therebetween.

In this illustrated example, the crown portion 12 is cut at a position of an inner diameter corresponding to the outer diameter of the cable 17 to be used in a state where a cable outlet is formed, and finally the cable outlet and the cable 17 are used. It is possible to fix the gap that is not opened by fixing the gap formed between and with the filling material while tightening the arbitrary outer peripheral portion with the tightening band 18.

In addition to this, the present invention can be applied to an open type cap and a non-open type cap other than those shown in the drawings, in which both openable ends are closed with a surface fastener or an adhesive tape. Alternatively, this can be implemented in a modified form.

[0013]

As is apparent from the above, according to the cap of the present invention, the air inside and outside the cable protection tube freely flows through the inner peripheral portion of the skirt portion at all times. The rise of can be kept low. Therefore, it is possible to prevent the allowable current of the cable from decreasing and the deterioration of the cable due to the decrease.

[Brief description of drawings]

FIG. 1 is a front view in which a right half portion of a cap according to an embodiment of the present invention is cut away.

FIG. 2 is a plan view of the embodiment shown in FIG.

FIG. 3 is a sectional view taken along line AA of the embodiment shown in FIG.

[Explanation of symbols]

 11 Cap 12 Crown 13 Skirt 14 Protrusion 15 Recess 16 Cable Protection Tube 17 Cable 18 Tightening Band

Claims (1)

[Scope of utility model registration request] 1. A rising cable protection comprising a tubular body having a lower wide crown portion cut at a portion corresponding to a cable outer diameter to form a cable outlet, and a skirt portion externally fitted to an upper end portion of a cable protection tube. A cap for a pipe, wherein the skirt has an inner peripheral portion provided with a concave portion capable of forming a space for communicating with the inside and outside of the cable protection pipe with the cable protection pipe.