JPH0632748Y2 - Cable entry part of cable junction box - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a cable introduction part of a cable connection box for introducing cables such as communication cables and optical fiber cables into the cable connection box while keeping airtightness. is there.

(Prior Art) FIG. 2 is a partially cutaway vertical sectional view of an example of a conventional cable junction box.

In the drawings, (1) is a cable such as a communication cable or an optical fiber cable, and (2) is a core wire connecting portion of these cables. A sleeve (3) made of rubber or plastic is located so as to enclose the core wire connecting portion (2) of the cable, and end plates (4) made of an elastic body are attached to both ends of the sleeve (3).

There are ridges (4a) on both sides of the outer peripheral surface of the end plate (4), and the space formed by the ridges (4a) and the inner peripheral surface of the end of the sleeve (3) is either unvulcanized or semi-vulcanized. A sealing material (6) is formed by winding an adhesive rubber tape to maintain airtightness between the sleeve (3) and the end face plate (4).

Further, the inner peripheral surface of the end plate (4) has a wavefront shape (4b), and there is no gap between the cable (1) and the inner peripheral surface of the end plate (4) having the wavefront shape (4b). Sealing material (7) formed by winding an adhesive tape made of vulcanized or semi-vulcanized rubber larger than the inner diameter of the end plate (4)
There is a sealing washer (5) on both sides of the end face plate (4) to prevent the flow of the sealing material (7).
It is positioned so as to be engaged with the circumferential groove (4c) provided on the inner circumference of the. Then, the sealing material (7) is pressed by the inner peripheral surface of the end face plate (4), and the friction of the wave surface and the sealing washer (5) prevent the sealing material (7) from being displaced or flowing out, The airtightness of the introduction part is maintained.

(Problems to be solved) In the cable introduction portion of the conventional cable connection box described above, an unvulcanized or semi-vulcanized adhesive rubber tape is used for the cable seal portion. Rubber has poor elasticity, and it is difficult to maintain the surface pressure generated by the compression when the end plate is attached for a long time. For this reason, it is necessary to use a rubber end face plate and to maintain the surface pressure by its elasticity, so that the end face plate cannot be made plastic.

In addition, the sealing material formed by winding an adhesive tape made of unvulcanized or semi-vulcanized rubber strongly adheres to the cable jacket and the inner peripheral surface of the rubber end face plate, which makes it difficult to disassemble the cable seal part. was there.

(Means for Solving the Problem) The present invention solves the above-mentioned problems and provides a cable introduction part of a cable connection box that enables plasticization of the end plate. Sealing material made by winding unvulcanized or semi-vulcanized adhesive rubber tape, vulcanized rubber tape winding part having an adhesive layer on the surface wound to a diameter larger than the inner diameter of the end plate and unvulcanized or semi-vulcanized rubber The end face plate is mounted on a cable seal portion formed by sequentially providing a sealing material formed by winding an adhesive rubber tape, and the cable seal portion is compressed to maintain airtightness.

FIG. 1 is a vertical cross-sectional view of a main part of a concrete example of a cable introduction part of a cable junction box according to the present invention.

In the drawing, (10) is the cable seal part,
An unvulcanized or semi-vulcanized adhesive rubber tape is thinly wound on the outer cover of (1) to provide an inner layer sealing material (12b), and a vulcanized rubber tape having an adhesive layer on the surface is tensioned with a constant tension. Then, the vulcanized rubber tape winding part (11) is formed by winding it to a diameter larger than the inner diameter of the end face plate, and further, an unvulcanized or semi-vulcanized adhesive rubber tape is thinly wound to seal the outer layer sealing material.
It is formed by providing (12a).

In forming the cable introduction part, after forming the cable seal part (10) on the outer cover of the cable (1) as described above, arrange the sealing washers (5) on both sides of the cable seal part (10). The end face plate (4) is attached to the outer side of the end face plate (4), and the outer circumferential portion of the sealing washer (5) is engaged with the circumferential groove (4c) provided on the inner periphery of the end face plate (4). As a result, the cable seal portion (10) is compressed and airtightness is maintained.

The hardness of the vulcanized rubber tape used for the vulcanized rubber tape winding portion (11) is suitably Hs 40 to 70 degrees, and the compression ratio of the cable seal portion (10) when the end face plate is attached is 5 to 30%.

(Operation) As described above, according to the cable introduction part of the present invention, by providing the elastic vulcanized rubber tape winding part in the cable seal part, the surface pressure is generated due to the reaction force of the end plate attached. However, since it can be held for a long period of time, the end plate can be made of plastic.

In addition, by forming the cable seal part by winding the vulcanized rubber tape, the cable seal part can be easily disassembled, and by further wrapping the sticky sealing material on the inner layer and the outer layer of the vulcanized rubber tape winding part. It is possible to fill the small scratches on the cable jacket and the inner peripheral surface of the end plate.

(Effects of the Invention) As described above, according to the cable introduction portion of the cable connection box of the present invention, the vulcanized rubber tape winding portion is formed in the cable seal portion, and this elasticity keeps airtightness, so that it can be used for a long time. It is possible to maintain stable airtightness for a long time, and it becomes possible to make the end plate a plastic, and the manufacturing cost of the end plate can be reduced.

Further, by using the vulcanized rubber tape for the cable seal portion, the cable seal portion can be easily disassembled and its workability is improved. Further, since the thin layer of the adhesive sealing material is provided inside and outside the wound portion of the vulcanized rubber tape, minute scratches on the cable jacket and the inner peripheral surface of the end face plate can be filled, and the reliability is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a cable introduction part of a cable junction box according to the present invention. FIG. 2 is a partially cutaway vertical sectional view of a conventional cable connection box. 1 ... Cable, 3 ... Sleeve, 4 ... End plate, 5 ...
… Ceiling washers, 10 …… Cable seals, 11…
… Vulcanized rubber tape winding part, 12a, 12b …… Adhesive sealing material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Nippon Telecommunications & Electronics Co., Ltd. 1300, Irukashinta, Kita Sotoyama, Komaki City, Aichi Prefecture (72) Akio Takashi, 1 Taya Town, Sakae Ward, Yokohama City, Kanagawa Sumitomo Electric Industries Inside Yokohama Works Co., Ltd. (72) Inventor Yoshihito Hinohara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (72) Inventor Ichijo Yubara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Yuji Otani 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Yoshikazu Nomura 1-1-5 Kiba, Koto-ku, Tokyo Fujikura Densen Co., Ltd. (72) Creator Koji Koshiyama 1-25-17 Himonya, Meguro-ku, Tokyo Tokyo Communication Engineering Co., Ltd. (72) Devised Gutter this win, Aichi Prefecture Komaki Oaza Kitatoyama Nyushikashinden 1300 address Japan communication material within Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A cable connection box composed of a sleeve containing a core wire connecting portion of a cable and end face plates attached to both ends of the sleeve, wherein an unvulcanized or semi-vulcanized adhesive rubber tape is wound on the cable. Formed by sequentially providing a sealing material by winding, a vulcanized rubber tape winding portion having an adhesive layer on the surface wound to a diameter larger than the inner diameter of the end plate and an unvulcanized or semi-vulcanized adhesive rubber tape winding sealing material. A cable introduction portion of a cable connection box, wherein the end face plate is attached on a cable seal portion, and the cable seal portion is compressed to maintain airtightness.