JP2004096964A - Cable grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a cable grommet that is highly airtight and excellent in water- and moisture-proof effects while having a simple structure. <P>SOLUTION: In the cable grommet 1, a plurality of concentric circular cutout grooves 11 and circular cutout portions 12a, 12b and 12b of different diameters that fit to each diameter of a plurality of kinds of leading-in cables are formed on a surface corresponding to guide parts for the cable 3. Then, the cable 3 is led into a cable lead-in opening 13 formed by cutting out one of the cutout grooves 11 that corresponds to the diameter of the cable 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cable grommet that functions as a cable covering protection member that is attached to an external cable introduction portion of a housing of a telecommunication device requiring a waterproof and moisture-proof effect, such as an optical fiber cable distribution board, a distribution board, and a distribution board.
[0002]
[Prior art]
In recent years, with the development and spread of optical communication equipment, an optical fiber communication network using an optical fiber cable for a communication line instead of a conventional telecommunication network has been rapidly developed, and the distribution (branching), relaying, and Optical distribution boards that are installed to make connections to communication devices have attracted attention. With the increase in the amount of information transmitted through the communication network, these optical distribution boards and the like are steadily increasing in the amount of installation, and must be installed directly outside the conventional communication station building. Have been. When installing such optical distribution boards outdoors, the installation location is limited even in the outdoors, and their housings are naturally required to be miniaturized. In addition to the need for a smaller area, it is necessary to consider the waterproof and moisture-proof effects in the housing.
[0003]
With reference to FIG. 4, the structure of a cable grommet according to the prior art and its usage will be described. In FIG. 4, a cable grommet 1 made of an elastic material having excellent weather resistance (for example, silicon rubber) has a cross-shaped notch groove 19 for forming a cable introduction opening 18 at the center of the surface. The cable 3 is fixed to an external cable introduction unit 5 provided in a housing such as an optical distribution board (not shown), and is used by inserting the cable 3 into the cable introduction opening 18 (for example, see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Publication No. 5-70318 (Fig. 5)
[0005]
Such a conventional cable grommet 1 has the following problems (defects).
[0006]
(1) Since the grommet 1 is provided for each single cable, its size (surface area) necessarily corresponds to the thickness of the largest diameter cable used for this kind of communication line. As a result, the area of the cable introduction portion 5 to which the cable grommet 1 is attached becomes large, which is against the tendency of downsizing of a housing such as an optical distribution board.
[0007]
(2) When the cable 3 is introduced, a cut is made in the cross-shaped notch groove 19 with a cutter knife or the like, and the cross-shaped portion is cut out to form a cable introduction opening 18 so that the cable 3 can be penetrated. Is omitted, a gap is formed between the cable 3 and the cable introduction opening 18, and the waterproof and moisture-proof effects in the housing are impaired.
[0008]
(3) When the cable 3 is introduced, the grommet 1 must be cut into the cross-shaped cut groove 19 with an appropriate cut length according to the thickness of the cable 3 to be introduced. Is difficult and cumbersome, and the work efficiency is poor.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems of the related art, and has a simple structure, can provide an excellent waterproof / moisture-proof effect with high confidentiality, and is widely used for cables. The aim is to get a grommet.
[0010]
[Means for Solving the Problems]
A first means of the present invention is a cable grommet in which a circular cut groove having a diameter corresponding to the thickness of an introduction cable is formed in a surface circular portion corresponding to a cable introduction portion. At the time of introduction, by making a cut in the circular cut groove and penetrating the cut circular part, a circular cable introduction opening corresponding to the diameter of the cable is opened, and the cable introduction opening The introduction cable is made to penetrate and be pulled in.
[0011]
The second means of the present invention is that a plurality of concentric cut grooves having different diameters corresponding to the thicknesses of a plurality of types of introduction cables having different thicknesses are provided on a surface circular portion corresponding to the cable introduction portion. A grommet for a cable that is formed, and when introducing an introduction cable, selects a circular notch groove corresponding to the thickness of the introduction cable from a plurality of concentric notch grooves and cuts the groove. By penetrating the inset circular portion, a circular cable introduction opening is opened, and the cable is penetrated and drawn into the cable introduction opening.
[0012]
A third means of the present invention includes a plurality of concentric cut grooves having different diameters corresponding to the thicknesses of a plurality of types of introduction cables, on a plurality of surface circular portions corresponding to the plurality of cable introduction portions, Grommets for cables formed so that a part of each of them overlaps, and when the introduction cable is introduced, a cut is made in a circular cut groove having a diameter corresponding to the number of introduced cables and their thickness. By penetrating the cut circular portion, a circular cable introduction opening is opened, and one or a plurality of cables are penetrated and drawn into the cable introduction opening.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a cable grommet according to the present invention will be described with reference to FIGS. FIG. 1 is a view for explaining a plan shape of a cable grommet according to the present invention, and FIG. 2 is a perspective view thereof. As shown in FIGS. 1 and 2 (A), the cable grommet 1 is made of an elastic material having excellent weather resistance (for example, silicon rubber), and corresponds to the cable introduction portions at the center of the surface and both sides of the center. A plurality of (three in the figure) cutting circular portions 12a, 12b, 12b in which a plurality of circular cutting grooves 11 having different diameters are concentrically arranged on the formed surface circular portion. The parts are arranged and formed so as to overlap.
[0014]
The circular cut groove 11 is formed at a depth reaching the back surface of the cable grommet 1 or near the back surface. When the circular cut groove 11 is formed so as to reach the back surface of the cable grommet 1, the circular cut groove 11 is formed by being partially interrupted by the bridging portion 111.
[0015]
The cut circular portions 12a, 12b, 12b are formed such that the cut circular portion 12a located at the center thereof is used for a relatively thick cable, and the cut circular portions 12b, 12b positioned on both sides of the center are relatively formed. If the cable is used for a thin cable, the same grommet can be used to draw in one relatively thick cable or a plurality of relatively thin cables (two in the figure).
[0016]
A first embodiment of the present invention will be described with reference to FIG. In the first embodiment, the cable grommet 1 has a cable introducing opening 13 formed by cutting out a cutout portion 14a by cutting a concentric cutout groove 11 having a predetermined diameter from a cutout circular portion 12a. Holding the introduction cable 3.
[0017]
Now, when one relatively thick cable 3 is introduced, it is introduced from a plurality of concentric cut grooves 11 having different diameters formed in a cut circular portion 12a at the center of the surface of the cable grommet 1. A concentric cut groove 11 having a diameter corresponding to the thickness of the cable 3 is selected, a cut is made along the concentric cut groove 11 with a cutter knife or the like, and the cutout portion 14a is cut out. The introduction opening 13a is opened, and the introduction cable 3 is penetrated and drawn into the cable introduction opening 13a.
[0018]
At this time, the remaining cutting circular portion 12a 'of the cutting circular portion 12a at the center of the surface and the cutting circular portions 12b, 12b at both sides of the center are connected to the groove 11 for circular cutting. Since the cutout 14a is not cut out unless it is removed along the circumference, the circular cable introduction opening 13a obtained by cutting out the cutout 14a from the circular cutout 12 does not become larger than the size of the cutout 14a. It becomes the one of the caliber suitable for the thickness of 3.
[0019]
As described above, the cable grommet of the present invention cuts out the circular cut portion 12 having a diameter corresponding to the thickness of the introduction cable 3 to form the cable guide opening 13. The inner wall of the introduction opening 13 is in close contact with the inner wall, and there is no gap between them, so that the airtightness is high, and the waterproof and moistureproof effects inside the housing such as the optical wiring board are not impaired.
[0020]
Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment shows a case where two introduction cables 3 are pulled in. The cable grommet 1 according to the second embodiment is held by a cable introduction portion 5 shown in FIG. 4 provided in a casing (not shown), and two cut circular portions 12b are cut out. The introduction cable 3 is held in the two cable introduction openings 13b.
[0021]
Now, when introducing two relatively thin cables 3, 3, a plurality of concentric circles having different diameters formed in two cut circular portions 12 b formed on both sides of the center of the grommet 1. Among the notching grooves 11, the concentric notching grooves 11, 11 having a diameter corresponding to the thickness of each of the two cables 3, 3 to be introduced are selected, and the concentric notching grooves 11, 11 are selected. The two cable introduction openings 13b, 13b are opened by making cuts along the cutouts 14b, 14b along the cutouts 14b, 14b, and the introduction cables 3, 3 are respectively inserted into the cable introduction openings 13b, 13b. And let it penetrate.
[0022]
At this time, the remaining notched circular portions 12b ', 12b' of the notched circular portions 12b, 12b located on both sides of the center and the notched circular portion 12a located at the center of the surface are formed by circulating these portions. Unless it is removed along the groove 11 for cutting, the cable introduction openings 13b, 13b formed by cutting out the cutouts 14b, 14b are larger than the cutouts 14b, 14b. The diameter of the cable corresponds to the thickness of each of the introduction cables 3 and 3.
[0023]
As described above, the cable grommet of the present invention forms the cable introduction openings 13b, 13b by penetrating only the cut circular portions 12b, 12b having diameters corresponding to the respective thicknesses of the introduction cables 3, 3. Therefore, the introduction cables 3 and 3 and the inner side walls of the cable introduction openings 13b and 13b are in close contact with each other, and there is no gap between them. The effect is not impaired.
[0024]
【The invention's effect】
According to the grommet for a cable of the present invention as described above, the following effects can be obtained.
[0025]
(1) Since the cable introduction opening 13 is formed by penetrating only the cut circular portion 12 having a diameter corresponding to the thickness of the introduction cable 3, the cable 3 and the inner side wall of the cable introduction opening 13 come into close contact with each other. There is no gap between them, and the airtightness is high, and the waterproof and moistureproof effects inside the housing such as the optical wiring board are not impaired.
[0026]
(2) A plurality of concentric notch grooves 11 having different diameters corresponding to the thicknesses of a plurality of types of introduction cables having different thicknesses are formed on the surface thereof in correspondence with the cable introduction portions, so that it is simple. In addition, since the cable introduction opening 13 corresponding to the thickness of the cable 3 to be introduced can be easily formed, it is possible to accommodate a plurality of types of introduction cables 3 having different thicknesses.
[0027]
(3) By forming a plurality of concentric notching grooves 11 so that each of them partially overlaps, a plurality of types of introduction cables having the same size (surface area) and different thicknesses can be obtained. A grommet for cables that is more versatile can be obtained.
[Brief description of the drawings]
FIG. 1 is a plan view illustrating the shape of a cable grommet according to the present invention.
FIG. 2 is an explanatory view showing a first embodiment of the cable grommet according to the present invention.
FIG. 3 is an explanatory view showing a second embodiment of the cable grommet according to the present invention.
FIG. 4 is an explanatory view showing an embodiment of a cable grommet according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Grommet for cable 11 Circular cut groove 111 Bridge portion 12 Cut circular portion 13 Cable introduction opening 14 Cutout 18 Cable introduction opening 19 Cross-shaped cut groove 3 Introduction cable 5 Cable introduction part

Claims (3)

A grommet for a cable, wherein a plurality of circular cut grooves having a plurality of diameters corresponding to the thickness of an introduced cable are formed in a surface circular portion corresponding to a cable introduction portion. The cable grommet according to claim 1, wherein the circular cut groove is formed in a plurality of concentric circles having different diameters. The said circular cutting groove is formed in the several surface circular part respectively corresponding to the several cable introduction part, respectively, and it is formed so that a part may overlap. Item 3. A grommet for a cable according to Item 2.

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