JPH0310576Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention utilizes the watertight effect of grommets that watertightly seal the gap between a cable passing through a hole provided in a wall such as a panel and the wall. This relates to the structure of the draining lip.

[Conventional technology and problems]

As shown in FIG. 4, when a cable 1 of an automobile or the like is installed by penetrating the dash panel 2, a grommet is used to seal the gap between the cable 1 and the dash panel 2. As shown in the figure, an annular groove 6 to be fitted into the dash panel 2 is provided in an annular substrate 5 connected to a tube 4 having a plurality of lips 3A, 3B, 3C that elastically clamps a cable 1. First and second lips 7A and 7B for elastically holding the dash panel 2 are provided on both sides of the groove, and a third lip 7C having a larger diameter than these and elastically contacting the outer surface of the dash panel is also provided. This seals the gap between the dash panel 2 and the cable 1.

Therefore, water that hits the front window of a car (see Figure 4) during rainy weather travels down the dash panel 2, but it hits the tip of the third lip 7C of the grommet A and does not enter the room. Even if there is a gap between the third lip 7C and the dash panel 2 and rainwater infiltrates, the first lip 7A is in elastic contact with the dash panel 2, so it will not enter the room. The structure is such that this is prevented.

Therefore, rainwater descending along the dash panel 2 is doubly prevented from entering by the lips 7A and 7C, but the dash panel 2 is not necessarily perfectly flat and has some distortion. Yes, as shown in FIG.
If there is a strain displaced in the direction of arrow P in a,
Since the first lip 7A that elastically adheres to this also displaces in the P direction, the third lip 7C displaces in the direction away from the dash board 2, loses its adhesion to the dash board 2, and greatly reduces the sealing effect of the grommet A. let

Therefore, conventional grommets have the disadvantage of not being able to follow local distortions existing on the vehicle panel surface.

The present invention provides a grommet that solves these problems.

[Means for solving problems]

A hard resin locking member having a panel locking part that locks into a hole provided in a panel, an annular peripheral wall connected to the outer peripheral edge of a hollow disc-shaped annular substrate, and a A grommet comprising a soft grommet body having an annular groove into which the outer circumference of the resin locking member is fitted,
A branching point is formed at an end of the annular peripheral wall to serve as a fulcrum on which an inner annular protrusion and an outer annular protrusion that branch and extend from the end are bent in a seesaw shape, and the inner annular protrusion A drainage lip that presses against the panel is provided at the tip of the outer annular projection.

[Effect]

With the above configuration, local distortion in the wall such as a panel causes excess or deficiency in panel contact pressure on either the drain lip of the inner annular protrusion or the drain lip of the outer annular protrusion, but The inner annular protrusion and the outer annular protrusion flex with each other in a seesaw shape with the branching point as a fulcrum so that the contact pressure is approximately equal, and excess or deficiency in the panel contact pressure of the draining lip is eliminated.

Therefore, both draining lips do not lose their watertightness and are not subjected to excessive contact pressure.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

Note that the same parts as in the conventional example are given the same reference numerals.

In FIG. 1, the grommet main body B has an annular base plate 5 connected to a tube 4 having a plurality of lips 3 for elastically holding a cable, and a central cylindrical annular peripheral wall 9 on the outer peripheral edge of the annular base plate 5. Continuously installed.

At the end of the annular peripheral wall 9, as shown in FIG.
An inner annular protrusion 1 that branches and extends from the end.
0 and the outer annular protrusion 11 form a branching point that serves as a fulcrum that bends in a see-saw shape with respect to each other, and the tip of the annular protrusion 10 becomes a draining lip 10a that is in close contact with the dash panel 2, and there is a second drain lip 10a on the inside near the tip. A protrusion 10b serving as a draining lip is provided.

On the other hand, a draining lip 11a is connected to the annular projection 11 in a bent direction.

In this embodiment, the draining lips 10a and 11a are provided on the outside and inside, respectively, but they may be provided on the inside and outside, respectively.

A hard resin locking member C is fitted into the annular recessed groove 9b formed on the inner surface of the annular groove 6, and a plurality of panel locking members which are fitted into holes in the dash panel 2 are fitted into the peripheral wall of the resin locking member C. A section 12 is provided,
As shown in FIG. 1, the grommet main body B is assembled to a resin lock member C that is locked to the dash panel 2. As shown in FIG.

The annular protrusions 10, 11 and draining lips 10a, 11a have the shapes shown in FIG. 2 before being assembled to the dash panel 2, but when they are attached to the dash panel 2, as shown in FIG. Due to the pressing force, the shape shown by the dotted line is bent into the shape shown by the solid line, and the projection 10b, together with the draining lips 10a and 11a, comes into close contact with the dash panel to seal the dash panel 2.

If there is a flatness defect on the contact surface of the dash panel 2, for example, if the tip 2a is high as shown in FIG.
The panel contact pressure of 1a increases, and accordingly, the annular projection 11 receives an upward pressing force, and the annular projection 11
and 10, a counterclockwise rotational torque is generated with the branch point 9a as a fulcrum.

Therefore, the draining lip 10a and the protrusion 10b do not separate from the dash panel 2, but instead receive a force that increases their adhesion to the dash panel.

Similarly, if the dash panel 2 is locally elevated at the point where the draining lip 10a makes contact, the annular protrusions 10 and 11 will receive clockwise torque and the adhesion force of the draining lip 11a will not decrease and will be reversed. increases to

As described above, since the annular protrusions 10 and 11 bend in a see-saw manner with respect to the branching point 9a, the contact pressure of the draining lips 10a and 11a is almost equalized, and excessive or insufficient contact pressure is eliminated, and the draining panel It does not lose its adhesion to 2.

Therefore, even if the upper surface of the dash panel 2 has some degree of flatness failure, the draining lip reliably seals the dash panel 2 and completely shuts out water from entering.

The protrusion 10b also acts as a second drainage lip to further ensure the sealing force of the grommet.

〔effect〕

Since the present invention is constructed as described above, the inner annular protrusion and the outer annular protrusion each having a draining lip at the tip can bend in a see-saw shape with respect to the branch point as a fulcrum. The contact pressure of the lip is almost equalized, and excess or deficiency of the panel contact pressure of the draining lip is eliminated, making it possible to completely eliminate the conventional problem of water intrusion accidents caused by panel distortion.

Furthermore, since the two-pronged draining ring is subjected to an almost uniform load, no localized load is applied to only one location, thereby extending the product life of the grommet as a whole.

[Brief explanation of the drawing]

Figures 1 to 3 show embodiments of the present invention;
The figure is a vertical cross-sectional view of a grommet incorporated in a distorted dash panel, Figure 2 is a vertical cross-sectional view of the draining ring shown above, Figure 3 is a vertical cross-sectional view showing the deflection state of the same flat dash panel, and Figure 4 is a schematic diagram showing the position of a cable passing through a dash panel of an automobile, etc., Figure 5 is a vertical cross-sectional view of a conventional grommet, and Figure 6 is a vertical cross-section of a main part of a grommet showing the effect of local strain on the dash panel on the drainage ring. It is a diagram. B... Grommet body, C... Resin lock member, 2... Dash panel, 2a... Tip, 3
...Rip, 4...Tube, 5...Annular substrate,
9... Annular peripheral wall, 9a... Branch point, 9b... Annular groove, 10, 11... Annular protrusion, 10a, 11a
...Draining lip, 10b...Protrusion, 12...Panel locking portion.

Claims (1)

[Scope of utility model registration request] A hard resin locking member having a panel locking part that locks into a hole provided in a panel, an annular peripheral wall connected to the outer peripheral edge of a hollow disc-shaped annular substrate, and a A grommet comprising a soft grommet body having an annular groove into which the outer circumference of the resin locking member is fitted,
A branching point is formed at an end of the annular peripheral wall to serve as a fulcrum on which an inner annular protrusion and an outer annular protrusion that branch and extend from the end are bent in a seesaw shape, and the inner annular protrusion and a draining lip structure of a grommet, characterized in that a draining lip that presses against the panel is provided at the tip of each outer annular projection.