JPH0717223Y2 - 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 and 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 to enclose the core wire connecting part (2) of the cable,
End plates (4) made of elastic material are attached to both ends thereof.

There are ridges (4a) on both sides of the outer peripheral surface of the end plate (4), the outer diameter of which is 1.0 to 10 mm smaller than the inner diameter of the sleeve (3).
Sealing material (5) made of unvulcanized rubber which is as large as 2.0% and is made of unvulcanized rubber in the space formed by the ridge (4a) and sleeve (3).
Are filled in to keep airtightness between the sleeve (3) and the end plate (4).

Further, the inner peripheral surface of the end face plate (4) has a corrugated shape (4b), and an adhesive seal material (6) made of unvulcanized rubber is provided between the cable (1) and the corrugated surface (4b). ), The sealing material (6) is pressed by the corrugated shape (4b) of the inner peripheral surface of the end plate (4), and the friction of the corrugated portion prevents the sealing material (6) from shifting or flowing out, thereby introducing the cable. The airtightness of the part is maintained.

(Problems to be Solved) In the above-described conventional cable introduction part, since the inner peripheral surface of the end face plate (4) has a wavefront shape, an additional adhesive layer is provided on the surface to keep the cable introduction part airtight. When applying a cable seal part in which a rubber tape is wound around the cable, the effect of pressing the cable seal part is equivalent to that of a flat inner peripheral surface, and the cable seal part cannot be compressed effectively, There is a problem that the reliability of airtightness is poor.

(Means for Solving the Problems) The present invention solves the above problems and provides a cable introduction portion of a cable junction box in which a winding portion of a vulcanized rubber tape is applied to a cable seal portion. The feature is that the vulcanized rubber tape having an adhesive layer on the surface is larger than the inner diameter of the end face plate cable introduction port on the cable introduction port of the end face plate that has an arc-shaped ridge protruding toward the cable on the inner peripheral surface. This is because the wound vulcanized rubber tape winding part was introduced.

FIG. 1 is a sectional view of an essential 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 an elastic end face plate to be attached to the end part of the sleeve (3), and an arcuate protrusion (11) protruding toward the cable side is formed on the inner peripheral surface thereof. The radius (R) of the arc-shaped ridge (11) is preferably about 50 to 200 mm. (12) is the vulcanized rubber tape winding part, and the cable (1)
It is formed by winding a vulcanized rubber tape having an adhesive layer on the surface, and by winding it larger than the inner diameter of the cable inlet of the end plate (4), as shown in the figure,
When introduced into the cable introduction port, the end face plate (4) is pressed by the arcuate ridges (11) on the inner peripheral surface of the end face plate (4), contact pressure is generated by the compression force, and airtightness is maintained.

(Operation) In the cable introduction portion of the cable connection box of the present invention described above, an arc-shaped ridge is formed on the circumferential surface of the end plate, and a vulcanized rubber tape having an adhesive layer on the surface is formed at this portion of the cable introduction port. By introducing a vulcanized rubber tape winding part that is wound larger than the inner diameter, the vulcanized rubber tape winding part is more effectively compressed than the conventional inner peripheral surface is flat or wavefront shape, and the contact surface pressure is reduced. It works effectively to generate.

(Effect of the Invention) As described above, according to the cable introduction part of the cable connection box of the present invention, the vulcanization introduced into the introduction port is formed by forming the arcuate ridge on the inner peripheral surface of the end plate. The rubber tape winding portion is effectively compressed, a contact surface pressure is generated, and the airtightness of the cable introduction portion can be improved to be stable and realized.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a concrete example 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 an example of a conventional cable connection box. DESCRIPTION OF SYMBOLS 1 ... Cable, 10 ... End plate, 11 ... Arc-shaped ridge on the inner peripheral surface of the end plate, 12 ... Vulcanized rubber tape winding part.

Front page continuation (72) Inventor Yoshihito Hinohara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Ichijo Yubara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Date This telegraph telephone company (72) Inventor Yuji Otani 1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Japan Telegraph telephone company (72) Nobuo Ide 1300, Iruka Nitta, Kitayama, Aichi prefecture Komaki city (56) References: JP-T-61-221508 (JP, A) Actual development: S58-52770 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A vulcanized rubber tape having an adhesive layer on the surface of a cable introduction port of an end face plate having an arcuate protrusion protruding toward the cable on an inner peripheral surface of the end face plate cable introduction port inner diameter. The cable introduction part of the cable junction box is characterized in that a vulcanized rubber tape winding part that is largely wound is introduced.