JPH0244421Y2 - - 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 the wall and an electric wire that penetrates a hole provided in a wall such as a panel. This relates to the structure of the draining lip that increases the

[Conventional technology]

As shown in FIG. 5, when a cable 1 of an automobile or the like is installed through a dash panel 2, a grommet is used to seal the gap between the electric wire 1 and the dash panel 2.
The conventional grommet described in No. 192423 is
As shown in the figure, the grommet body A is composed of a soft grommet body A and a hard resin locking member B, and the grommet body A has a tube 4 having a plurality of lips 3 that elastically clamp and seal the electric wire 1. An annular substrate 5 is connected to the annular substrate 5, and a cylindrical annular peripheral wall 6 is connected to the outer peripheral edge of the annular substrate 5.

At the end of the annular peripheral wall 6, there are provided an annular holding part 7 that extends inwardly and an annular draining lip 8 that extends outwardly and extends in a bent manner from the tip of the holding part 7. An inner lip 9 is provided.

Then, the annular substrate 5, the annular peripheral wall 6 and the holding part 7
The base 1 of the resin lock member B is placed in the space consisting of
A locking portion 12 is provided at the end of the peripheral wall 11 which is connected to the base portion 10 .

Reference numeral 13 denotes a draining rib provided on the draining lip 8, as shown in FIG.
When the grommet main body A is assembled to the resin locking member B that is locked to the grommet body A, the tips of the draining lip 8, the draining rib 13, and the inner lip 9 are elastically deformed and come into close contact with the wall 2. It has a sealed structure.

Even if the wall 2 has gentle irregularities, the elastic grommet main body A keeps the wall 2 in a sealed state.

[Problem that the invention attempts to solve]

However, as shown in FIG. 7A, the wall 2
When a convex foreign object 14 is fixed to the surface of the drain rib 13, the foreign object 14 lifts up the draining rib 13, creating a gap between the draining rib 13 and the wall 2, and causing the draining rib 13 to As the rice cake rises, the tip 8a of the draining lip 8 may rise and water may leak.

Furthermore, as shown in Fig. 7B, if a problem occurs in which the tip 8a is rolled inward when assembling the grommet to the wall 2, the draining rib 13 will lift up and lose its waterproof function, preventing water leakage. There was something that caused it.

The present invention has been made to address this problem.

[Means for solving problems]

The present invention provides a grommet that seals the gap between an electric wire that penetrates a wall such as a panel and the wall, and the grommet extends from the end of the annular peripheral wall of the grommet at an angle toward the wall, with the tip extending toward the wall. A contacting annular draining lip is provided, and a plurality of draining ribs whose cross-sectional shape gradually increases from the tip toward the end of the annular peripheral wall are provided around the wall side surface of the draining lip.

[Effect]

The tip of a conventional draining lip is more flexible than the end of the annular peripheral wall, and can easily deform and come into close contact with a wall or a foreign object stuck to the surface of the wall. Since the lip pressing force is small on the side of the lip, it deforms and loses its ability to stick tightly.

However, in the present invention, if a plurality of draining ribs are provided on the draining lip and the dimensions of the draining ribs are increased toward the end side of the annular peripheral wall, the pressing force of the draining rib increases as the dimension of the draining rib increases. By providing large-sized draining ribs in areas where the amount of deflection is small, it is possible to make them adhere closely to the wall.

In this way, all of the plurality of draining ribs provided on the draining lip can have a wall sealing function, so that a highly reliable grommet with excellent waterproof function can be obtained.

〔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.

FIG. 1 shows a case where the draining lip 8 is provided with two draining ribs 13A and 13B.

That is, a draining rib 13A is provided on the surface of the wall 2 side of the annular draining lip 8 (see FIG. 3) that extends from the end of the annular circumferential wall 6 toward the wall 2 and has a tip 8a in contact with the wall 2. , 13B are provided.

The size of the draining ribs 13A, 13B is as shown in FIG.
In contrast, the draining rib 1 near the end of the annular peripheral wall 6
3B is larger, and its size increases as it approaches the annular peripheral wall 6, as shown by the dashed line in FIG.

If the cross-sectional shape of the draining rib 13B becomes large, the pressing force thereof becomes large, and when the position of the wall body 2 is displaced or when a convex foreign object is present, the pressing force increases and the ability to make a close contact increases. .

The amount of deflection of the draining lip 8 is larger as it is closer to the tip 8a, and its ability to stick closely to the wall 2 is greater.On the other hand, the amount of deflection is smaller on the side closer to the annular peripheral wall 6, so that it follows the displacement of the wall 2. However, since the draining rib 13B with a large cross-sectional shape is provided at such a position, the draining rib 13A, 1
3B both have a waterproof function, and if either one does not seal the wall 2, the other can seal the wall 2.

FIG. 3A shows the case where both the draining ribs 13A and 13B are in close contact with the wall 2, and FIG. 3C shows a case where the tip 8a of the draining lip 8 is caught in the wall 2 and the draining rib 13A is lifted up, but the draining rib 13B is in close contact with the wall 2 and can prevent water leakage. .

FIG. 4 shows another embodiment, in which the draining lip 8 has draining ribs 13A, 13B, 13C and 1.
3D is provided, and each draining rib has the function of sealing the wall body 2.

〔effect〕

In the present invention, a plurality of draining ribs are provided on the draining lip, and the cross-sectional shape of each draining rib gradually increases from the tip toward the end of the annular peripheral wall, so that each of the plurality of draining ribs has a waterproof function. I was able to do that.

Therefore, the sealing layer of the grommet was increased, and the reliability of the water leakage prevention function of the grommet was improved.

[Brief explanation of drawings]

1 to 4 show embodiments of the present invention.
The figure is a cross-sectional view of the main part showing the draining lip of the grommet, Figure 2 is a cross-sectional view of the main part explaining the relationship between the size and position of the draining rib, and Figure 3 is the main part showing the contact state between the wall and the draining rib. 4 is a sectional view of the main part of a draining lip showing another embodiment, FIG. 5 is a schematic diagram showing the position of a cable passing through a panel of an automobile, etc., and FIG. 6 is a vertical sectional view of a conventional grommet. ,
FIG. 7 is a sectional view of a main part showing a contact state of draining ribs of a conventional grommet. 6... Annular peripheral wall, 7... Holding part, 8... Draining lip, 8a... Tip, 9... Inner lip, 1
3, 13A, 13B, 13C, 13D...Draining rib, 14...Foreign object.

Claims (1)

[Scope of utility model registration request] In a grommet that seals a gap between an electric wire inserted through a hole provided in a wall such as a panel and the wall, the annular circumferential wall of the grommet is inclined toward the wall from the end thereof, and its tip extends toward the wall. An annular draining lip that contacts the body is provided, and a plurality of draining ribs whose cross-sectional shape gradually increases from the tip toward the end of the annular peripheral wall are provided around the surface of the draining lip on the wall side. The structure of the draining lip of the grommet.