JPH09312926A - Grommet for cable closure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve airtightness and waterproof properties of a grommet by connecting an outer cylinder member and an inner cylinder member located inside through a connecting section which is located at one end. SOLUTION: A grommet G is constituted of an outer cylinder member Ga which has a nearly cylindrical shape and an inner cylinder member Gb which has a nearly cylindrical shape and is located inside. One of the circumferential edges of the outer cylinder member Ga and one of the circumferential edges of the inner cylinder member Gb are connected with a connecting section g1 over the entire circumference. The inner cylinder member Gb is formed thick and the outer cylinder member Ga is formed thin. By cutting the outer cylinder member Ga and the inner cylinder member Gb, which constitute the grommet G, from a cut section g6 half, a cable can be installed in the outer cylinder member Ga or in the inner cylinder member Gb. A ring-shaped projecting section g7 formed on an outer face of the outer cylinder member Ga in the circumferential direction of the outer cylinder member Ga elastically deforms and improves airtightness between the grommet G and a cable closure when the grommet G is pressurized by an inner wall of the cable closure. As a result, airtightness and waterproof properties of the grommet can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet for a cable closure (hereinafter, simply referred to as a grommet for a cable closure of a cable closure for accommodating a cable connecting portion).
Also called "grommet". ) Is related to.

[0002]

2. Description of the Related Art Heretofore, a grommet formed of a soft elastic material having a cylindrical or disc shape having a cable introduction hole has been known, and the grommet is provided with a slit extending from the outer peripheral surface to the cable introduction hole. . Then, on the outer peripheral surface of the grommet in which the cable has been inserted into the cable introduction hole through the slit, after winding an adhesive sealing tape or applying grease etc., the grommet is arranged in the cable introduction part of the cable closure. , The adhesion between the grommet and the cable introduction portion of the cable closure is maintained, and the airtightness and waterproofness of the cable closure are ensured.

[0003]

In the above-mentioned conventional grommets, it is necessary to prepare grommets having various cable introduction holes according to the outer diameter of the cable introduced into the cable closure, and therefore, There is a problem that the manufacturing cost of the grommet increases and the storage management becomes complicated.

When the outer diameter of the cable is relatively smaller than the inner diameter of the cable introduction hole of the grommet, a plurality of layers of sealing tape are wound to reduce the outer diameter of the cable.
Although the inner diameter of the cable introduction hole of the grommet is adjusted, there is a problem that it takes time to connect the cables and store the cables in the cable closure because the sealing tape is wound in multiple layers.

Further, since the sealing tape has fluidity, when wound in multiple layers, it becomes easy to move following the movement of the cable, and the sealing tape sticks out from the cable introduction hole of the grommet, and the grommet. There was a problem that the airtightness and waterproofing function of the device were impaired and that it was difficult to see.

An object of the present invention is to solve the problems of the above-mentioned conventional grommet for a cable closure and to provide a grommet for a cable closure having improved cable connection workability.

[0007]

In order to achieve the above-mentioned object, the present invention firstly provides two tubular members, an outer tubular member and an inner tubular member located inside the outer tubular member, Secondly, the groove formed on the inner peripheral surface of the outer cylindrical member and the groove formed on the inner peripheral surface of the inner cylindrical member are connected to each other through a connecting portion arranged at one end. It is arranged by shifting in the direction.

First, one embodiment of the present invention will be described with reference to FIGS. 1 to 6, but the present invention is not limited to this embodiment without departing from the spirit of the present invention.

[0009]

EXAMPLES G is a substantially cylindrical grommet formed of a soft elastic material such as rubber or soft synthetic resin.
As shown in FIG. 1 and FIG. 2, it is composed of a substantially cylindrical outer cylinder member Ga and a substantially cylindrical inner cylinder member Gb arranged inside the outer cylinder member Ga. Outer cylinder member G
One peripheral end of a and one peripheral end of the inner tubular member Gb are
The entire circumference is connected by the connecting portion g1.
The peripheral end g2 of the inner tubular member Gb located on the opposite side of the connecting portion g1
And the peripheral end g3 of the outer tubular member Ga located on the opposite side of the connecting portion g1 are coincident with each other, and as shown in FIGS. 1 and 2, the peripheral end of the inner tubular member Gb. The g2 may be recessed inward from the peripheral end g3 of the outer tubular member Ga.

The inner cylinder member Gb is formed with a thin wall thickness, while the outer cylinder member Ga is formed with a thick wall thickness. Further, the inner cylinder member Gb is connected to the connecting portion g1.
It is configured so that it can be separated from the outer cylinder member Ga by cutting.

G4 is an annular groove formed along the circumferential direction at an appropriate position on the inner peripheral surface of the outer cylindrical member Ga, and g5 is an appropriate inner peripheral surface of the inner cylindrical member Gb. It is an annular groove formed at a position along the circumferential direction. Outer cylinder member Ga
The groove g4 formed on the inner peripheral surface of the grommet G and the groove g5 formed on the inner peripheral surface of the inner cylindrical member Gb are arranged at positions displaced in the axial direction of the grommet G, and are configured not to overlap each other. Has been done. Groove g formed on the inner peripheral surface of the outer tubular member Ga
4 and the groove g5 formed on the inner peripheral surface of the inner tubular member Gb,
A sealing material such as grease is embedded to improve the airtightness inside the cable closure.

Reference numeral g6 denotes a slit portion that extends from the outer peripheral surface of the outer tubular member Ga to the inner peripheral surface of the inner tubular member Gb. From the slit portion g6, the outer tubular member Ga that constitutes the grommet G.
Also, the inner cylinder member Gb is opened in half and the cable can be mounted inside the outer cylinder member Ga or the inner cylinder member Gb. In addition, such a cut portion g6
The cable may be configured to be inserted into the outer tubular member Ga or the inner tubular member Gb without providing the.

Reference numeral g7 denotes an annular convex portion formed on the outer peripheral surface of the outer tubular member Ga along the circumferential direction of the outer tubular member Ga. As will be described later, the grommet G is provided in the cable closure, and the grommet G is provided. However, when it is pressed against the inner peripheral wall of the cable closure, the annular convex portion g7 is elastically deformed, and the adhesion between the grommet G and the cable closure is further improved. Although FIGS. 1 and 2 show an example in which two annular convex portions g7 are provided so as to protrude at a predetermined interval, the number of annular convex portions g7 may be one, or three or more. Further, the annular convex portion g7 can be omitted if necessary.

The grommet G having the above-mentioned structure is preferably integrally formed by molding means such as injection molding. When molding the grommet G, the thick outer cylinder member Ga is preferably formed in a cylindrical shape having a substantially constant outer diameter and inner diameter, and the inner cylinder member Gb has a substantially constant wall thickness. It is preferable that the inner cylinder member Gb located on the opposite side of the connecting portion g1 is tapered toward the peripheral end g2 in consideration of taking out the integrally molded grommet G from the mold. Even if the inner cylinder member Gb is formed in a tapered shape, the inner cylinder member Gb is formed in a thin shape,
It is easily deformed, and thus can be closely attached to the outer peripheral surface of the cable attached to the inner tubular member Gb. On the other hand, the outer cylinder member G
When the inner peripheral surface of a is slanted, the outer cylindrical member Ga is formed thick and is difficult to be deformed. Therefore, the inner peripheral surface of the outer cylindrical member Ga and the outer peripheral surface of the cable attached to the outer cylindrical member Ga are A gap is likely to be formed between the outer cylinder member Ga and the outer cylinder member Ga and the cable is poor in adhesion.

Next, the grommet G having the above-mentioned structure
Will be described as an example of a two-divided cable closure C, but not limited to the two-divided cable closure, various known cable closures,
The grommet G having the structure described above can be arranged.

Reference numerals 1a and 1b denote a lower sleeve and an upper sleeve, which are formed by dividing a cylindrical body having a substantially cylindrical shape into two in the longitudinal direction. The dividing surfaces 1a 'and 1b' of the lower sleeve 1a and the upper sleeve 1b are adjacent to each other. The cable closure C is assembled by joining and connecting with the known fastening band 2 and the like. The lower sleeve 1a
Since the upper sleeve 1b and the upper sleeve 1b have the same structure,
The lower sleeve 1a will be described below.

Reference numeral 3 denotes a grommet accommodating portion formed at both ends in the longitudinal direction of the lower sleeve 1a. The grommet accommodating portion 3 is formed in a semi-cylindrical shape into which the lower half of the grommet G can be mounted. An end wall 4 is provided at the longitudinal end of the lower sleeve 1a of the grommet accommodating portion 3, and a partition wall 5 is provided at a position separated from the end wall 4 by approximately the thickness of the grommet G.
The outer peripheral edge 5 ′ of the partition wall 5 and the end portion of the body portion 1a ″ of the lower sleeve 1a are connected by an inclined wall 6. The end wall 4 has a semicircular shape. A notch 7 is formed, and a notch 8 for escape of the cable W introduced into the cable closure C is formed in the partition wall 5. The grommet housing 3 having the above structure is a lower sleeve. It is also formed on the other end of 1a,
Also, the upper sleeve 1 joined to the lower sleeve 1a
It is also formed at both ends in the longitudinal direction of b. The grommet accommodating portion 3 formed on the lower sleeve 1a and the upper sleeve 1b forms a cable introduction portion of the cable closure C when the lower sleeve 1a and the upper sleeve 1b are joined.

Reference numeral 9 denotes a well-known horizontal support frame arranged in the lower sleeve 1a. The support frames 10a of the tension member members 10 are attached to the horizontal support frame 9 near both ends thereof with screws 10b or the like. Has been done. The support frame 10a includes
The core wire holding metal fitting 10c is attached by a screw 10d or the like. Further, the support frame 11a of the cable restraining member 11 is attached to the horizontal support frame 9 located outside the tension member member 10 with a screw 11b or the like, and the upper end of the support frame 11a having a semicircular recess is formed. In the portion 11c, a holding metal fitting 11d having a semicircular recess is also provided.
It is attached by a screw 11e or the like.

Next, the means for mounting the cable W on the cable closure C will be described mainly with reference to FIGS.

As is well known, the cable W introduced into the cable closure C has its sheath removed and the core wire w.
1 is pulled out. When the cable W is thin, as shown in FIG. 5, the slit g6 is opened in the inner tubular member Gb that is not separated from the outer tubular member Ga, and the thin cable W is attached. It should be noted that the sealing tape S is previously attached to the outer circumference of the cable W attached to the inner tubular member Gb.
Is further wound, and a sealing material A such as grease is embedded in the groove g5 formed on the inner peripheral surface of the inner tubular member Gb. Next, after the sealing tape S is wound around the outer peripheral surface of the outer tubular member Ga to a further extent, the grommet G having the cable W inserted therein is inserted into the grommet housing portion 3 of the lower sleeve 1a of the cable closure C and the connecting portion g1 is provided. Mount it so that it is located outside the cable closure C.
After that, the cable W is attached to the upper end portion 11c of the support frame 11a of the cable holding member 11 using the holding metal fitting 11d, and the core wire w1 is used to support the tension member member 10 using the core wire holding metal fitting 10c. Attach to 11a. After the connection work or the connection change work is completed, the upper sleeve 1b is joined to the lower sleeve 1a, and the lower sleeve 1a and the upper sleeve 1b are joined by the fastening band 2.

As described above, when the lower sleeve 1a and the upper sleeve 1b are joined and joined by the fastening band 2, the grommet G inserted into the grommet housing portion 3 of the lower sleeve 1a and the upper sleeve 1b. Is configured to be in pressure contact with the inner peripheral wall of the grommet housing portion 3. In other words, the inner diameter of the cylindrical space portion 12 formed by the grommet housing portion 3 of the lower sleeve 1a and the upper sleeve 1b is formed to be slightly smaller than the outer diameter of the outer tubular member Ga of the grommet G.

When the cable W is thick, the inner cylinder member Gb is separated from the outer cylinder member Ga as shown in FIG. After that, the slit portion g6 is opened, and the thick cable W is attached to the outer cylinder member Ga. In the same manner as described above, the sealing tape S is further wound around the outer circumference of the cable W attached to the outer tubular member Ga, and the outer tubular member G is
A sealing material A such as grease is embedded in the groove g4 formed on the inner peripheral surface of a. Then, after the sealing tape S is wound around the outer peripheral surface of the outer tubular member Ga to a further extent, the grommet G having the cable W inserted therein is attached to the grommet housing portion 3 of the lower sleeve 1a of the cable closure C. The other means for attaching the cable W to the cable closure C is the same as in the case described above, and therefore description thereof will be omitted.

Next, the case where two cables are introduced into one cable introduction portion of the cable closure C will be described with reference to FIGS. 7 and 8.

Lower sleeve 1a of cable closure C
The above-mentioned grommet storage parts 3 are provided side by side at both ends of the upper sleeve 1b. Also,
On the outer peripheral surface of the outer cylinder member Ga of the grommet G having the above-described configuration, the protruding piece g8 is provided in a protruding manner, and the protruding piece g8 has
A hole g8 'into which a positioning pin (not shown) protruding between the grommet accommodating portions 3 provided side by side is fitted.
Are formed.

The two grommets G are arranged so that the protruding pieces g8 projectingly provided on the outer peripheral surface of the outer tubular member Ga overlap each other, and the two grommets accommodating portions provided side by side with the lower sleeve 1a of the cable closure C. Attach to 3. At this time, a pin (not shown) protruding between the adjacent grommet housings 3 is fitted into the hole g8 'to align the grommet G. Then, similarly, the upper sleeve 1b on which the two grommet accommodating portions 3 are formed is replaced with the lower sleeve 1a.
To join. It should be noted that, as shown in FIG. 7, the sealing tape S is formed on the joint surface of the overlapped convex pieces g8 '.
Is preferably interposed. Further, when the two grommets G are mounted on the grommet housing portions 3 of the lower sleeve 1a and the upper sleeve 1b, the sealing tape S is provided over the entire outer circumference of the two grommets G provided side by side.
It is preferable to arrange about 1 layer.

FIG. 9 shows an embodiment in which three grommets G are provided side by side. In this embodiment, the grommet G located at the center is provided with two protruding pieces g8 at a position shifted by about 180 degrees on the outer peripheral surface thereof. And the two convex pieces g8 of the grommet G located in the middle
Grommet G on which the above-mentioned one convex piece g8 is projectingly provided
Are arranged so that the convex pieces g8 overlap each other. When the three grommets G are provided side by side in this way, it goes without saying that the three grommet housing portions 3 are also formed in the lower sleeve 1a and the upper sleeve 1b of the cable closure C.

The functions and effects of the grommet G of the present invention will be listed below.

Since the grommet G is formed by the two tubular members located outside and inside the outer tubular member Ga and the inner tubular member Gb, the grommet G can be used for the cables W having different diameters. Since the contact area between the cable W and the cable W to be mounted can be increased, the airtightness and waterproofness of the cable closure C are improved.

Since the inner tubular member Gb can be easily separated from the outer tubular member Ga by cutting the connecting portion g1, the workability of introducing the cables W having different diameters into the cable closure C is improved. improves. Also, the connecting portion g
Since 1 is formed at the ends of the outer tubular member Ga and the inner tubular member Gb, the work of removing the inner tubular member Gb from the outer tubular member Ga is easy.

An inner cylinder member G located on the opposite side of the connecting portion g1.
The peripheral end g2 of b and the peripheral end g3 of the outer tubular member Ga located on the opposite side of the connecting portion g1 are the same, or the peripheral end g2 of the inner tubular member Gb is the peripheral edge of the outer tubular member Ga. From the end g3,
Since the inner cylinder member Gb is retracted inward and the peripheral end g2 of the inner cylinder member Gb does not extend outside from the peripheral end g3 of the outer cylinder member Ga, the grommet G attached to the grommet housing portions 3 of the lower sleeve 1a and the upper sleeve 1b. Is attached to the inner peripheral wall of the grommet accommodating portion 3 so as to be in pressure contact with the outer peripheral member g.
The peripheral end g2 of the inner tubular member Gb protruding from 3 is turned up outward, and water or the like does not easily enter the joint surface between the inner tubular member Gb and the cable W from this portion.

A groove g4 formed on the inner peripheral surface of the outer tubular member Ga.
Since the groove g5 formed on the inner peripheral surface of the inner tubular member Gb is disposed at a position displaced in the axial direction of the grommet G, when the cable W is attached to the inner tubular member Gb, the inner tubular member Gb is attached. The groove g5 formed on the inner peripheral surface of Gb falls into the groove g4 formed on the inner peripheral surface of the outer cylindrical member Ga, and the inner cylindrical member Gb
It is possible to prevent the concave portion from being formed in the vicinity of the groove g5 formed on the inner peripheral surface of the inner peripheral surface of the inner peripheral member Gb and the deterioration of the adhesion between the inner cylindrical member Gb and the attached cable W. Further, since the inner cylinder member Gb is formed thin, the groove g5 of the inner cylinder member Gb is
When it falls into the groove g4 of the outer cylinder member Ga, the inner cylinder member Gb is deformed and the elastic force is impaired, and the adhesion between the inner cylinder member Gb and the attached cable W is impaired.

Even if the inner cylinder member Gb is formed in a taper shape, the inner cylinder member Gb is formed in a thin shape, so that the inner cylinder member Gb is easily deformed. Therefore, the inner cylinder member Gb is attached to the outer peripheral surface of the cable attached to the inner cylinder member Gb. Can be in close contact. Further, the thick outer cylinder member Ga is formed in a cylindrical shape having a substantially constant outer diameter and inner diameter, and the inner peripheral surface of the outer cylinder member Ga is not formed in an inclined shape, so the outer cylinder member Ga is formed. And the adhesion of the cable W attached to the outer tubular member Ga is improved.

[0033]

Since the present invention is constructed as described above, the following effects can be obtained.

Since the grommet is formed by the two tubular members, the outer tubular member and the inner tubular member, it is possible to cope with cables having different diameters and to increase the contact area between the grommet and the attached cable. Because you can
The airtightness and waterproofness of the cable closure are improved.

Since the connecting portion is formed at the ends of the two tubular members, the outer tubular member and the inner tubular member, the work of removing the inner tubular member from the outer tubular member is easy.

Since the groove formed on the inner peripheral surface of the outer cylinder member and the groove formed on the inner peripheral surface of the inner cylinder member are arranged at positions shifted in the axial direction of the grommet, It is possible to prevent the adhesion with the attached cable from being impaired.

[Brief description of drawings]

FIG. 1 is a perspective view of a grommet for a cable closure of the present invention.

FIG. 2 is a cross-sectional view of the grommet for cable closure of the present invention taken along the line II of FIG.

FIG. 3 is a partial front view including a partially cut portion of the cable closure in which the grommet for cable closure of the present invention is housed.

FIG. 4 is a partial perspective view of a cable closure accommodating the grommet for cable closure of the present invention.

FIG. 5 is a vertical sectional view of a main part of a cable closure in which the grommet for cable closure of the present invention is housed.

FIG. 6 is a vertical cross-sectional view of the main part of the cable closure in which the grommet for cable closure of the present invention is housed, which is similar to FIG.

FIG. 7 is a perspective view showing a state in which two cable closure grommets of the present invention are provided side by side.

FIG. 8 is a partial perspective view of a cable closure in which the grommet for cable closure of the present invention shown in FIG. 7 is housed.

FIG. 9 is a perspective view showing a state in which three cable closure grommets of the present invention are provided side by side.

[Explanation of symbols]

 C ・ ・ ・ ・ ・ ・ Cable closure G ・ ・ ・ ・ ・ ・ Grommet Ga ・ ・ ・ ・ ・ Outer cylinder member Gb ・ ・ ・ ・ ・ Inner cylinder member S ・ ・ ・ ・ ・ ・・ ・ Sealing tape W ・ ・ ・ ・ ・ ・ Cables g4, g5 ・ ・ ・ ・ Groove w1 ・ ・ ・ ・ ・ ・ ・ Core wire 1a ・ ・ ・ ・ ・ Upper sleeve 1b ・ ・ ・ ・Upper sleeve 3 ・ ・ ・ ・ ・ ・ Grommet housing 10 ・ ・ ・ ・ ・ ・ ・ Cable restraining member 11 ・ ・ ・ ・ ・ ・ ・ Tension member member

Claims (2)

[Claims] 1. A grommet for a cable closure, characterized in that two tubular members, an outer tubular member and an inner tubular member located inside the outer tubular member, are connected via a connecting portion disposed at one end. 2. The groove formed on the inner peripheral surface of the outer cylinder member and the groove formed on the inner peripheral surface of the inner cylinder member are arranged so as to be displaced in the axial direction of the grommet. Grommet for cable closure.