JPH0311768Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a grommet used for holding electric wires etc. through a panel or the like.

Conventional technology Grommets are attached to electrical wire through-holes in panels, etc., to seal the gap between them and the panel.
Many are made of soft elastic materials. In the case where the annular groove provided in the panel mounting part of the grommet is fitted with the peripheral edge of the panel hole, the grommet with the electric wire, etc. passed through it is compressed and deformed, and the grommet is fitted into the panel hole. However, there is a problem that the workability is not good.

Therefore, a grommet has been proposed that can be locked and installed simply by pushing it into the panel hole. In order to increase the reliability of locking into the panel hole, the locking portion is formed of a hard elastic material. As a grommet with such a structure,
For example, Utility Model Publication No. 59-155783 discloses what is shown in FIGS. 3 and 4.

This grommet is a combination of a sealing member A made of rubber or the like and a locking member B made of synthetic resin or the like, and the locking member B is the end of a cylindrical part _b1 provided with a locking protrusion _b2 . is provided with flange b ₃ ,
In addition, the sealing member A has a neck part _a1 formed so as to be able to adhere tightly to the outside of the electric wire W, etc., followed by a base part _a2 that opens toward the mounting panel P, and a flange on the panel mounting surface side of the base part _a2 . There is an annular groove _a3 into which the peripheral edge of _b3 can be fitted, and an annular lip _a4 which can be brought into close contact with the panel surface.

Such conventional grommets are transported and assembled with the sealing member A and locking member B fitted together in advance, but they may get caught on other items during such handling. As shown in Fig. 5, the annular flange holding part _A5 may be turned over or jammed, causing the problem that the lip _A4 does not come into uniform contact with the panel P, resulting in incomplete sealing. Ta.

Problems to be Solved In contrast to grommet according to the prior art, there was a risk of accidents such as water leakage due to defects such as incomplete sealing.
It is an object of the present invention to provide a highly reliable grommet in which a rubber seal member is tightly coupled to a resin lock member and will not easily come off.

Means for Solving the Problem In order to achieve the above-mentioned object, the present invention includes a locking member made of a hard elastic material for fixing in a panel hole, and a locking member that fits around the periphery of the flange of the locking member. In the grommet, the bottom surface of the annular groove constitutes an inverted conical surface having an apex in the direction of the panel mounting surface of the grommet, and the maximum of the bottom surface The diameter is approximately equal to the outer diameter of the flange, and the minimum diameter of the bottom surface is smaller than the outer diameter of the flange, and the side surface of the annular groove on the panel mounting surface side is opposite to the panel mounting surface. This is a conical surface having an apex in the direction.

Embodiment Figures 1 and 2 show the shape of the grommet of the present invention, where 1 is a sealing member made of a soft elastic material, and 2 is a locking member made of a hard elastic material.

The locking member 2 has a structure similar to that of the prior art, with reference numeral 21 a cylindrical portion, 22 a locking protrusion, and 2
3 is a flange. On the other hand, the structure of the sealing member 1 is also similar to that of the conventional technology, with reference numeral 11 a neck portion that can be tightly attached to the outside of the inserted electric wire, numeral 12 a base portion, and a peripheral edge portion of a flange 23 on the panel mounting surface side. a flange holding part 13 for fixing the
This forms an annular groove 14 into which the flange 23 is fitted. Further, 15 is an annular lip for achieving sealing by coming into close contact with the panel surface.

The bottom surface of the annular groove 14 is not a mere cylindrical surface as in the conventional product, but is a funnel-shaped or inverted conical surface having an apex O on the axis in the direction of the mounting surface of the panel P. The diameter of the wide side of the bottom surface, ie, the maximum diameter x, is approximately equal to the outer diameter z of the flange 23, and the diameter of the narrow side of the bottom surface, ie, the minimum diameter y, is smaller than the outer diameter z of the flange 23.
Furthermore, the side surface m of the annular groove 14 on the mounting side of the panel P
is not a flat surface like the conventional product, but a cap-shaped or conical surface having an apex q on the axis in the direction opposite to the mounting surface direction of the panel P. Furthermore, these two
When the intersection of the generating lines of two conical surfaces is n, ∠qno
is formed at an obtuse angle, that is, the bottom surface and the side surface m intersect at an acute angle.

When assembling a grommet by fitting the sealing member 1 and locking member 2 thus formed, when the peripheral edge of the flange 23 is fitted into the annular groove 14, the peripheral surface h of the flange 23 is compressed by the bottom surface. ,
Further, the back surface k of the flange is pressed by the side surface m and is strongly tightened. Therefore, the flange retainer 13 and annular lip 1 of the assembled grommet
Even if an external force is applied to 5, the fitting will not easily come off.

Effects of the invention As explained above, the grommet of the invention is assembled with the sealing member and locking member tightly fitted together, and internal stress is always acting on it. Even if an unexpected external force is applied, the fitted state does not easily change, and therefore reliability is greatly improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the grommet of the present invention, and FIG. 2 is an enlarged partial sectional view of the grommet in an assembled state. FIG. 3 is a cross-sectional view of an example of a conventional locking grommet, FIG. 4 is a cross-sectional view showing its assembled state, and FIG. 5 is an enlarged partial cross-sectional view showing a failure state due to an accident or the like.

Claims (1)

[Claims for Utility Model Registration] (1) A locking member made of a hard elastic material for fixing to a panel hole, and a soft elastic material having an annular groove that can fit into the peripheral edge of the flange of the locking member. In the grommet, the bottom surface of the annular groove constitutes an inverted conical surface having an apex in the direction of the panel mounting surface of the grommet, and the maximum diameter of the bottom surface is approximately equal to the outer diameter of the flange. and the minimum diameter of the bottom surface is smaller than the outer diameter of the flange, and the side surface of the annular groove on the panel mounting surface side forms a conical surface having an apex in a direction opposite to the direction of the panel mounting surface. A grommet characterized by: (2) The grommet according to claim 1 of the utility model registration, wherein the bottom surface of the groove-like groove and the side surface on the panel mounting surface side intersect at an acute angle.