JP2941705B2 - Cable protection bushing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective bushing for protecting a wiring cable mainly from a ceiling among indoor wiring in a building.

[0002]

2. Description of the Related Art The ceiling of an office building is formed by fixing a ceiling panel to a ceiling edge supported by floor beams above the floor. For wiring such as lighting mounted on the ceiling, a power cable is drawn from behind the ceiling to the indoor side. Specifically, FIG.
As shown in the figure, a vertically divided peripheral wall portion 02 is erected on the inner peripheral portion of the annular base plate portion 01, and a latch portion 03 is protruded on the outer periphery of the top portion of the peripheral wall portion 02, and a fan-like shape is formed inside the annular base portion. The protective bushing a made of resin provided with a large number of the protective pieces 04 is used, and a through hole is previously formed at a predetermined position of a ceiling edge b formed by bending a long thin metal plate. A protective bushing a is attached to the through hole, and then the ceiling panel c is fixed to the rim b (FIG. 5). A hole d is formed in the ceiling panel c at a predetermined position (protection bushing fixing position) so that the power cable e wired behind the ceiling is prevented from being damaged by the metal bezel b through the protection bushing a. To be introduced into the room and connected to a predetermined appliance.

[0003]

In the wiring work using the protective bushing a, when the power cable e wired above and below the ceiling is introduced into the room through the protective bushing a, Workers must enter the narrow ceiling and push out the power cable from the ceiling to the indoor side, which is very complicated work.

[0004] In addition, when the space inside the ceiling is particularly narrow and a worker cannot enter, the power cable is inserted into the protective bushing a and drawn into the room in advance, and then the ceiling panel is mounted. A very complicated operation is required in which a through-hole is formed in advance at the draw-out point, and a cable is passed through the through-hole to mount the panel. Therefore, the present invention proposes a novel protective bushing in which a power cable to be wired above the ceiling can be easily introduced into the room.

[0005]

SUMMARY OF THE INVENTION A protective bushing according to the present invention comprises a ring-shaped main body mounted on a ceiling edge and a large number of fan-shaped protective pieces projecting inward from the main body. A detachable portion is provided so that the detachable portion is connected to the detachable portion, and a cable connecting cord having an appropriate length is attached to the detached portion.

[0006] The protective bushing according to the present invention is attached to the ceiling edge of the ceiling, and at the same time, a cable connecting cord is tied to a power cable located behind the ceiling, and the ceiling panel is fixed to the edge of the ceiling as before. When a hole is formed in a predetermined position of the ceiling panel and the exposed protective bushing detaching portion is cut out from the main body and pulled out, the power cord is also pulled out by the connecting cord.

[0007]

Next, an embodiment of the present invention will be described. The protective bushing A according to the present invention comprises a main body 1 and a cable connecting cord 2, and the main body 1 is entirely formed of a resin having flexibility. As shown in FIG. A vertically divided peripheral wall portion 12 is erected on an inner peripheral portion of the peripheral wall portion.
In addition, a large number of fan-shaped protection pieces 14 are provided inside the ring-shaped base portion 11, and detachable portions 15 whose both ends are slightly connected to the ring-shaped base portion 11 are provided.

The cable connecting cord 2 has an appropriate length and has one end firmly connected to the detaching portion 15 and the other end formed with a cord loop 21 for hooking a power cable.

The use of the protective bushing A will be described. Basically, as before, a through hole is previously formed at a predetermined position of a ceiling edge B formed by bending a long thin metal plate. The protective bushing A is mounted on the rim B by inserting the peripheral wall portion 12 into the through hole and holding the rim B between the base plate portion 11 and the latching portion 13. At the same time, the power cable E located behind the ceiling is passed through the strap 21 so that the cord 2 and the power cable E do not come off. Thereafter, the ceiling panel C is fixed to the rim B to perform ceiling covering, and at the position of the predetermined protective bushing A,
When a hole D is formed in the ceiling panel C and the exposed portion 15 of the protective bushing is cut off from the main body 1 and pulled out, the power cord E is pulled out to the room side by the connecting cord 2 (FIG. 3). When the cable E is pulled out, the cable E is held by the protection piece 14, so that the metal edge B prevents the cable E from being damaged.

[0010] Therefore, the power cable can be pulled out from the indoor side, and there is no need to enter the work behind the ceiling after the ceiling is installed, and the work efficiency is remarkably improved.

The present invention is not limited to the above embodiment, and the string itself may be formed integrally with the main body without binding the string to the detached portion of the main body. May be adjustable, and it is not particularly necessary to form a strap. Further, the present invention can be applied to other than ceiling wiring.

[0012]

As described above, according to the present invention, a protective bushing for a power cable used for a metal ceiling margin is provided with a detachable portion which can be easily cut and a connecting cord for connecting the power cable attached to the detachable portion. By attaching the connecting cord to the power cable behind the ceiling when installing the protective bushing, the power cable can be pulled out from the indoor side, contributing to the simplification of wiring work. .

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an explanatory view of a use state of the protective bushing of the present invention (before pulling out a cable).

FIG. 3 is an explanatory view of the use state of the protective bushing of the present invention (after the cable is drawn).

FIG. 4 is a perspective view of a conventional protective bushing.

FIG. 5 is an explanatory diagram of a use state of a conventional protective bushing (before a cable is drawn).

FIG. 6 is an explanatory diagram of a use state of a conventional protection bushing (after a cable is drawn).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 11 Ring-shaped base plate part 12 Peripheral wall part 13 Latch part 14 Protective piece 15 Separation part 2 Cable connection string 21 String ring

Claims (1)

(57) [Claims] 1. A ring-shaped main body which is attached to a through hole formed in a ceiling edge formed by bending a long thin metal plate, and a plurality of fan-shaped protection pieces projecting inward from the main body. In the protective bushing, a detachable portion is provided inside the main body so that the detachable portion is easily detachable, and a cable connecting cord of an appropriate length is attached to the detachable portion. Bushing.