JPH09284954A - Moisture-proof grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sealing member from fall-off and being caught in a screw part in wiring and maintain the moisture-proofness. SOLUTION: A grommet is composed of a grommet body 2 which has an attaching means by which the grommet is attached to an attaching plate 4, a bush tightener 8 which is attached to the grommet body 2, a bush 9 which is provided between the body 2 and the bush tightener 8 and an O-ring-shaped sealing member 10. A rib 12 protruding inward in provided on the inner side of the sealing member 10 so as not to interfere its squeeze and, on the other hand, a recess 13 which is mated with the rib 12 of the sealing member 10 is formed in the grommet body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet used for pulling a cord to the outside in various electric and electronic devices, and more particularly to a waterproof grommet for the purpose of sealing a wiring outlet.

[0002]

2. Description of the Related Art Conventional grommets are actually fair 1-918
No. 8 and Japanese Utility Model Publication No. 58-21296, a main body fixed to a mounting plate by a nut, a cap formed with a female screw fitted to a male screw on the outer side of the main body, and a main body And a bush that is interposed between the cap and the cap to tighten the electric wire by tightening the cap,
A seal member such as an O-ring that is in contact with the mounting plate is often used.

[0003]

However, in these conventional grommets, since the sealing material in contact with the mounting plate is not fixed to the main body, the sealing material may fall off when assembled in the mounting plate, or the sealing material may be screwed. I was sometimes caught up in the club and the waterproofness was compromised. The present invention has been made to solve the above-mentioned problems, and prevents the sealing material from falling off or being caught in a screw portion during wiring work, and does not impair waterproofness. It is intended to provide a waterproof grommet.

[0004]

The present invention employs the following configuration to achieve the object. That is, the waterproof grommet of the present invention includes a grommet main body having a mounting means to a mounting plate, a bush tightening body mounted to the outer main body, and a bush interposed between the main body and the bush tightening body. , An O-ring-shaped sealing material that is in close contact with the mounting plate, and a rib is formed inwardly in the sealing material that does not affect the collapsing margin, and the grommet body has the sealing material of the sealing material. A concave portion that engages with the rib is formed.

Further, it is desirable to dispose a ring washer outside the sealing material.

[0006]

[Operation] According to the present invention having the above-mentioned structure, the sealing material can be fixed to the grommet body by engaging the rib of the sealing material with the recess of the grommet body. Further, by restricting the outer circumference of the sealing material with a ring washer, even if the state of the mounting surface changes to some extent, it is possible to deal with a constant crushing margin and prevent overtightening.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment (hereinafter referred to as an "embodiment") of a waterproof grommet according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a waterproof grommet, and FIGS. 2, 3, 4, and 5 are longitudinal sectional views showing a usage state of an embodiment of the grommet,
2 shows before attachment, FIG. 3 shows during attachment, FIG. 4 shows after attachment (before wire tightening), and FIG. 5 shows after wire tightening. The waterproof grommet 1 is provided on a cylindrical grommet body 2 provided with a screw part 3 for attaching to a mounting screw hole 5 provided on a mounting plate 4, and on the opposite side of the grommet body 2 from the screw part 3. Bush tightening body 8 provided with male screw portion 7 that fits into female screw portion 6, bush 9 interposed between grommet body 2 and tightening body 8, and provided on the surface in contact with mounting plate 4. And a rib 12 of the seal material 10 on the inner side of the seal material 10 opposite to the crushing margin 11, and the rib 12 of the seal material 10 is formed on the grommet main body 2. Recess 13 to engage
Is formed and the sealing material 10 is fixed to the grommet main body 2.

The grommet body 2 has a hollow cylindrical shape, and is provided with a screw portion 3 for attaching to the attachment screw hole 5 of the attachment plate 4 at one end outside the flange 14 as a boundary.
It is formed so as to be attachable to the attachment screw hole 5 and the female screw portion 6 is provided inside the other end so that a tightening body 8 described later can be received. Further, a reduced diameter portion 16 is provided at the outlet on the screw portion 3 side so as to serve as a stopper for the outlet on the screw portion 3 side when the bush 9 is interposed.

Further, the concave portion 1 is provided on the side of the screw portion 3 of the flange 14.
3 is formed. A rib 12 of an O-ring-shaped sealing material 10 to be described later is pushed into and engaged with the recess 13 so that the sealing material 10 can be fixed to the grommet body 2.

A male screw portion 7 formed on a hollow cylindrical tightening body 8 is screwed into the female screw portion 6, and the grommet main body 2
A bush 9 interposed between the inside of the body and the tightening body 8.
Is formed so that it can be tightened. The bush 9 is formed in a tubular shape, and a rubber-based material whose diameter is reduced when compressed in the longitudinal direction is used, but neoprene rubber is particularly preferable. Since the bush 9 is made of a rubber-based material, it has a large frictional resistance, and when the tightening body 8 is screwed in, the bush 9
Twisting is likely to occur, and it is desirable to insert a washer 17 between the tightening body 8 and the bush 9 to prevent kinking. Washer 17 if kinking is acceptable
There is no need to put. Further, the sealing material 10 fixed to the grommet body 2 is formed in an O-ring shape, and the rib 12 is formed inward on the inner side opposite to the collapsing margin 11. A ring washer 15 is provided on the outer periphery of the seal member 10 so that even if the mounting surface is slightly changed, it can be dealt with with a constant crush margin. The ring washer 15 is not necessary if the waterproofness can be secured without it, or if the outer peripheral regulating portion of the sealing material 10 can be integrally formed with the grommet body 2.

Next, the waterproof grommet 1 shown in this embodiment.
The case of fixing the electric wire 18 will be described with reference to.
First, the bush 9 is inserted into the grommet body 2 from the female screw 6 side and pushed until it comes into contact with the reduced diameter portion 16 and stops, and then the washer 17 is inserted, and then the male screw portion 7 of the tightening body 8 is inserted. Bush 9 on female thread 6 of 2
Is tightened so as not to be compressed, and the tightening body 8 is attached to the grommet body 2. Next, the sealing material 10 is pushed so that the ribs 12 engage with the recesses 13 of the grommet body and fixed to the grommet body 2 as shown in FIG.
Normally, it is stored in the assembled state of FIG. When fixing the electric wire 18, first pass the electric wire 18 through the inside of the grommet in this assembled state, then arrange the ring washer 15 on the outside of the sealing material 10, and then attach the male screw part 3 as shown in FIG. When the sealing material 10 is screwed into the mounting screw hole 5 of the plate 4, the crushing margin 11 is crushed, and the sealing material 10 is fixed to the mounting plate 4 with a sealed body as shown in FIG. In this mounting work, the ribs 12 of the sealing material 10 are the recesses 1 of the grommet body 2.
Since the sealing material 10 is fixed by being engaged with the sealing material 10, the sealing material 10 does not fall off the grommet main body 2 or is not caught in the screw portion, and when the collapsing margin 11 of the sealing material 10 is crushed, the sealing material 10 The outside of the ring is a washer 1
As a result, it is possible to obtain a certain amount of collapsing margin and to prevent overtightening, so that it is possible to ensure waterproofness. Then, after adjusting the pull-out length of the electric wire, the male screw portion 7 of the tightening body 8 is screwed into the female screw portion 6 of the grommet body 2 to compress and reduce the diameter of the bush 9 as shown in FIG. Tighten and fix the wire to.

When the electric wire 18 is to be removed, the male screw portion 7 of the tightening body 8 is turned in the direction of loosening in reverse to the above-mentioned operation to restore the compression of the bush 9 to the original state and then the electric wire 1
8 can be easily taken out and a change can be made.

The present invention is not limited to the above embodiment. For example, in compressing the bush 9 in the above embodiment, a female screw 6 is provided on the grommet body 2 to tighten the tightening body 8.
Provide a male screw 7 on the inside of the grommet body 2
Although the grommet body is provided with a male screw and the fastening body is provided with a female thread, a bush may be interposed between the grommet body and the fastening body on the fastening body side. In addition, since the grommet is attached in the above embodiment, the mounting plate 4 is provided with the screw holes 5
And a threaded portion 3 fitted in the screw hole 5 in the grommet body 2.
However, the screw hole 5 may be a through hole having no screw and may be tightened with a nut from the opposite side of the flange 14 of the mounting plate 4. Further, in the above-described embodiment, the sealing material 10 has the ribs 12 formed inwardly on the opposite side to the crushing margin 11, but the position of the ribs 12 may be any location as long as it does not affect the crushing margin 11. For example, as shown in a cross-sectional view as a sealing material 19 of another embodiment in FIG. 6, a rib 20 is formed inwardly in the middle, and a grommet body (not shown) is formed.
A recess (not shown) corresponding to the shape of the rib 20 may be formed in the. Since the sealing material 19 formed by directing the rib 20 inwardly in the middle of the rib 20 has no front and back (direction),
When fixing the sealing material 19 to the grommet body, it is not necessary to check the front and back, and the workability can be improved.

[0014]

Since the present invention is configured as described above, the following effects can be obtained. According to the invention of claim 1, by engaging the rib of the seal material with the recess of the grommet body, the seal material can be fixed to the grommet body, so that the seal material may fall off during wiring work, or It is possible to provide a waterproof grommet that is prevented from being caught in the screw part and that does not impair the waterproof property.

According to the second aspect of the present invention, the outer periphery of the sealing material is regulated by the ring washer, so that even if the state of the mounting surface changes a little, it is possible to deal with the constant squeezing margin and prevent overtightening. Therefore, waterproofness can be secured.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state before use in a use state according to an embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing the mounting of the embodiment of the present invention in use.

FIG. 4 is a vertical cross-sectional view showing after mounting (before tightening an electric wire) in a use state of an embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a state after the electric wire is tightened in a use state according to an embodiment of the present invention.

FIG. 6 is a vertical sectional view showing a sealing material according to another embodiment of the present invention.

[Explanation of symbols]

 1 Waterproof Grommet 2 Grommet Main Body 3 Screw Part 4 Mounting Body 5 Mounting Screw Hole 8 Tightening Body 9 Bushing 10 Sealing Material 12 Rib 13 Recess 15 Ring Washer 19 Sealing Material 20 Rib

Claims (2)

[Claims] 1. A grommet main body having a mounting means for mounting to a mounting plate, a bush tightening body mounted on the outer main body, a bush interposed between the main body and the bush tightening body, and a bushing close contact with the mounting plate. O-ring-shaped sealing material, which has a rib formed inwardly at the inside of the sealing material that does not affect the collapsing margin, and engages with the rib of the sealing material on the grommet body. A waterproof grommet with a recess. 2. The waterproof grommet according to claim 1, wherein a ring washer is provided outside the sealing material.