JPH0510387Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a grommet that can be easily fitted into a panel hole.

(Prior Art) When a wire harness or the like is inserted into a panel hole, a grommet configured as shown in FIG. 3, for example, is used as a grommet to prevent water from entering through the gap between the hole and the wire harness. Are known.

According to this grommet, a cylindrical wire insertion part 51 is connected to the small-diameter end of a grommet main body 50 made of rubber or the like and having a truncated conical shape and a hollow interior. And the grommet body 5
A circumferential groove 52 that locks into the hole H of the panel P is provided on the outer circumferential surface of the large diameter side of the wire insertion portion 5.
Wire tightening portions 53 are provided on the inner circumferential surface of 1 at appropriate intervals in the axial direction.

When fitting and fixing the grommet configured in this way into the hole H of the panel P, the wire harness A is inserted in advance and the tape 30 is wrapped around the wire insertion portion 51 and the wire harness A. Then, the wire insertion part 51 and the grommet main body 50 are inserted into the hole H together with the wire harness A, and the wire insertion part 51 and the grommet main body 50 are pulled out from one surface side of the panel P to the other surface side, and the circumferential groove 52 hole H
It locks on the inner peripheral edge of the As a result, the grommet main body 50 is fitted and fixed in the hole H, and water and the like are prevented from entering.

(Problem to be solved by the invention) In the above grommet, the outer peripheral surface 50a of the grommet body 50 is tapered in order to facilitate fitting into the hole H of the panel P, but since it is made of rubber etc. If the coefficient is large and it rubs against the inner circumferential edge of the hole H during fitting, large friction will occur between the outer circumferential surface 50a and the inner circumferential edge of the hole H, and the grommet body 50 will fit into the hole H and the circumferential groove There were problems such as a large force being required to lock the hole H to the inner peripheral edge of the hole H.

This invention solves the problems of the prior art described above, and its purpose is to provide a grommet that does not require a large amount of force and is easy to fit into a hole in a panel.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, this invention uses a grommet made of rubber or the like that has a wire insertion part connected to the grommet body which is fitted into a hole in a panel and fixed. The grommet main body is characterized in that a sheet-like member made of a flexible thin plate having a small coefficient of friction is brought into close contact with the outer peripheral surface of the grommet main body.

It is desirable that the sheet-like member has a slit formed in a portion located on the large diameter side of the grommet main body.

In this invention, the term "fixed" includes not only the case where the sheet-like member is simply tightly attached to the outer circumferential surface of the grommet body, but also the case where the sheet-like member is integrally attached to the outer circumferential surface of the grommet body. be.

(Function) When the grommet body is fitted into a hole in a panel and fixed, the outer circumferential surface of the grommet body is not rubbed against the inner circumferential edge of the hole, but instead the sheet-like member provided on the outer circumferential surface is rubbed. The sheet-like member has a small coefficient of friction and can reduce the friction between it and the inner peripheral edge of the hole.

Furthermore, if a slit is provided at one end of the sheet-like member located on the larger diameter side of the grommet main body, even if the sheet-like member is integrally attached to the grommet main body, it will easily deform when passing through the hole.

(Example) An example of this invention will be described below with reference to the drawings.

Fig. 1 shows a first embodiment of the grommet of this invention, and the reference numeral 10 in the figure is a grommet main body made of rubber or the like, which has a truncated conical shape and is hollow inside, and its small diameter end. A cylindrical wire insertion portion 11 is connected to the portion. In addition, a hole H in the panel P is provided on the outer peripheral surface of the large diameter side of the grommet main body 10.
A circumferential groove 12 is formed to engage the outer circumferential surface 1 between the circumferential groove 12 and the wire insertion portion 11.
0a is tapered to facilitate fitting into the hole H of the panel P, but the important point here is that
This is because the friction between the hole H and the inner circumferential edge of the hole H is reduced.

In this embodiment, a sheet-like member 20 having a small coefficient of friction and formed in the same shape as the outer circumferential surface 10a is attached to the tapered outer circumferential surface 10a of the grommet main body 10.
Then, one end portion of this sheet-like member 20 is fixed at the boundary between the grommet body 10 and the wire insertion portion 11 with a tape 30 wrapped around the wire insertion portion 11 and the wire harness A. Therefore, when the grommet body 10 is fitted into the hole H and fixed, there is little friction even if it rubs against the inner periphery of the hole H (see the two-dot chain line in Figure 1), so it is necessary to pull it with a large force. There are no problems and it can be done smoothly. Also, there is no need for the effort required when using silicone oil.

Here, as the sheet-like member 20, in addition to having a small coefficient of friction, a flexible thin plate that is suitably hard and has little elongation, such as a hard polyethylene film, a polyester film, a hard polyvinyl chloride film, etc., is preferable. With such a slippery film,
When fitting, even if rubbed against the inner peripheral edge of the hole H, it will not stretch or tear, and the fitting operation can be performed smoothly. Further, the sheet-like member 20 is set to such a length that its hem portion does not overlap the circumferential groove 12. Therefore, when the circumferential groove 12 is locked into the hole H of the panel P, the hem portion of the sheet-like member 20 does not get caught between the circumferential groove 12 and the inner circumferential edge of the hole H, and the waterproof property is not impaired. .

Note that C in FIG. 1 is a burring provided on the inner peripheral edge of the hole H.

When fitting and fixing into the hole H of the panel P, the wire harness A is inserted in advance and the tape 30 is wound around it, as in the conventional case. Furthermore, the wire clamping portion 11a is provided on the inner circumferential surface of the wire insertion portion 11, which is the same as in the prior art.

After the sheet-like member 20 is fitted and fixed into the hole H, it may be removed from the outer circumferential surface 10a and discarded.

Figure 2 shows a second embodiment of this invention.
The sheet-like member 20 is integrally attached to the outer circumferential surface 10a of the grommet body 10 by means such as double molding, and a substantially triangular shape is formed at the hem portion of the sheet-like member 20 (the portion located on the large diameter side of the grommet body 10). This embodiment differs from the first embodiment in that a shaped slit 21 is formed, but the other points are the same.

Here, the reason why the sheet-like member 20 is integrally attached to the outer circumferential surface 10a of the grommet body 10 in advance by means such as double molding is to save the effort of covering the grommet body 10 with the sheet-like member 20 each time on site. It is. Furthermore, the slit 21 is formed so that when the grommet main body 10 and the sheet-like member 20 are passed through the hole H, they can be easily deformed and passed through the hole H. In other words, the sheet-like member 20
If it were integrally attached to the outer circumferential surface 10a of the grommet body 10, it would be difficult to deform, but the slit 21 allows it to be easily deformed to fit the hole H.

Therefore, with the grommet of this second embodiment, fitting the grommet into the hole H becomes easier.

Note that even when the sheet-like member 20 is simply placed over the outer circumferential surface 10a of the grommet main body 10, providing the slit 21 further facilitates the fitting operation into the hole H. That is, when simply covering the outer peripheral surface 10a of the grommet main body 10 with the sheet-like member 20,
Since both are free from each other, the grommet main body 10 is easily deformed to fit the hole H, but the sheet-like member 20 has an excess portion.
This surplus portion becomes an obstacle when passing through the hole H, but the slit 21 absorbs the surplus portion (prevents it from occurring).

[Effects of the invention] As explained above, according to this invention, a sheet-like member made of a flexible thin plate with a small coefficient of friction is brought into close contact with the outer circumferential surface of the grommet main body, so that fitting into the hole of the grommet main body is easy. At this time, the friction between the inner peripheral edge of the hole and the inner peripheral edge of the hole can be reduced, and a large force is not required, and there is no need for the time and effort required when using silicone oil. Therefore, the fitting operation of the grommets becomes easy, which is particularly advantageous for fitting operations in narrow spaces.

Further, by providing a slit in the sheet-like member, the fitting operation can be further facilitated.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of this invention, FIG. 2 is a sectional view showing a second embodiment of this invention, and FIG. 3 is a sectional view showing a prior art. . 10...Grommet main body, 10a...Outer peripheral surface,
11... Electric wire insertion part, 20... Sheet-like member, 2
1...slit, P...panel, H...hole.

Claims (1)

[Claims for Utility Model Registration] (1) In a grommet made of rubber or the like, in which a wire insertion portion is connected to the grommet body that is fitted into a hole in a panel and fixed, the outer peripheral surface of the grommet body has a coefficient of friction. A grommet characterized by a sheet-like member made of small flexible thin plates closely attached. (2) The grommet according to claim 1, wherein the sheet-like member has a slit formed in a portion located on the larger diameter side of the grommet main body.