JPS6159067A - Grommet - Google Patents

Abstract

PURPOSE:To prevent excessive deformation of inserting unit in attaching by making distances between plural circular arc type grooves arranged annularly actuate as ribs by arranging the plural grooves annularly through bulkheads. CONSTITUTION:Plural circular arc grooves 6...6 are formed from the upper face of a non-inserting unit 3 to the lower face of an inserting unit 2 so as to surround a blind hole 1. And bulkheads 7...7 between the circular arc grooves 6...6 are made to actuate as ribs connecting the outer circumferential wall of a boss unit 8 and the inner circumferential wall of the inserting unit 2. Therefore, when pressing the boss unit 8 to attach to a grommet mounting hole 10, the bulkheads 7...7 are actuated as ribs to prevent excessive deformation of the inserting unit 2 in attaching, and attachment to the grommet mounting hole 10 can be simplified and sealing performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a grommet made of a soft material such as rubber or plastic used to close drain holes in the floor or trunk of an automobile.

BACKGROUND OF THE INVENTION This type of grommet generally has a blind hole 1 in the center as shown in FIG. The insertion part 2 is installed in the panel 9 of the floor or trunk room of all automobiles ^ Grommet attachment holes such as water drain holes lo K are fitted so that the non-insertion part 3 covers the grommet attachment hole 10 and closes the hole 10. It has become. However, the grommet having such a configuration has a drawback that it is difficult to attach the grommet because the insertion part 2 is difficult to shrink just by pressing the upper surface of the non-insertion part 3.

Therefore, as shown in FIG. 4, an annular groove 4tl- extending from the upper surface of the non-insertion part 3 toward the lower surface of the insertion part 2 is formed on the periphery of the non-insertion part 3, and the blind hole 1 and the annular groove 4 prevent insertion. A boss portion 5 having a cross-sectional opening shape is formed in the center of the portion 3, and when the upper surface of the boss portion 5 is pressed, the insertion portion 2 is pulled by the boss portion 5 having a cross-sectional opening shape, and is expanded and contracted, as shown in FIG. Kurometsu 11, which has a diameter that allows it to be smoothly installed in the grommet mounting hole IO - was busy being developed (Utility Model No. 53-28
No. 21).

Problems to be Solved by the Invention The grommet of Utility Model Application No. 53-2821 can be used if it is made of a relatively hard synthetic resin material, but if it is made of a soft natural or synthetic rubber material, etc. In this case, the boss portion 5 and the insertion portion 2 are easily deformed, resulting in problems such as difficulty in press-fitting or poor sealing performance.

Means for Solving the Problems Instead of the conventional annular groove, a plurality of arcuate grooves are arranged in a ring shape via a partition wall.

The nine arcuate grooves are arranged in a working ring and the distance between them is ffl.
') It acts as a grommet to prevent excessive deformation of the insertion part during installation (press-fitting), and after installation, the insertion part is crimped into the grommet mounting hole to improve sealing performance.

Example Next, an embodiment of the present invention will be described with reference to FIG. 1.2.

1 is a blind hole, 2 is an insertion part with the above-mentioned hole 1 provided in the center, 3
6... is a non-insertion part connected to the upper end of the insertion part 1112;
Reference numeral 6 denotes a plurality of circular arc grooves arranged in an annular manner on the periphery of the non-inserted portion 30; 7...7 denotes a partition wall of the circular arc grooves 6 and 5IIA; 8;
is a boss portion having an opening-shaped cross section formed in the center of the non-insertion portion 3 by the blind hole 1 and the plurality of arcuate grooves 6 . . . 6 . The plurality of arcuate grooves 6...6 extend from the upper surface of the non-inserted part 3 to the inserted part 2.
The partition wall portions 7...7 between the arcuate grooves 6...6 are formed over the lower surface of the boss g158 and the inside of the insertion portion 2. It is designed to act as a rig that connects the peripheral wall fc.

Since the grommet of the embodiment has the above-mentioned configuration, when the boss portion 8 is pressed and the grommet (112) hole 10K'' is attached, the partition wall portions 7...7 act as lips, and the insertion portion 2 at the time of attachment is attached. This prevents excessive deformation of the insertion part 2 and facilitates installation into the grommet mounting hole 10. After installation, the insertion part 2 is supported from the inside by the partitions 7...7, and the insertion part 2 is
! '[12't The grommet is brought into close contact with the circumferential surface of the grommet mounting hole 10 to improve sealing performance.

be.

In addition, in the embodiment shown in the drawings, a case is shown in which the arcuate grooves 6...6 and the partition wall portions 7...7 are arranged in an annular manner, with four pieces arranged alternately at equal angles (90 degrees), but the arcuate grooves 6...6 And even if the number of partition walls 7...7 is 3, it is 51'l! ! It may be more than that.

Effects of the Invention Although the structure is similar at first glance to the conventional case with an annular groove, the partition wall portions 7...7 between the circular arc grooves 6, 6 act as lips, which prevents deformation of the insertion portion 2 during installation. In addition to making the installation easier, after installation, the insertion portion 2 is supported from the inside by the partition wall portions 7...7, and the insertion portion 2 is brought into close contact with the circumferential surface of the grommet attachment hole 10, thereby improving the sealing effect. can.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the grommet of the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ of Fig. 1, Fig. 3 is a cross-sectional view of the most common grommet, and Fig. 4 is a sectional view of the grommet of the Utility Model Publication No. 53-2821. FIG. 5 is a cross-sectional view of the grommet in the No. 1 issue, and FIG. 5 is a cross-sectional view of the grommet in use. 1... Blind hole, 2... Insertion part, 3... Non-insertion part, 6... Arc-shaped groove,
7...Partition wall part, 8...Boss part. 1st Figure 2

Claims (1)

[Claims] (1) An insertion part (2) with a blind hole (1) in the center, and a non-insertion part (3) connected to the upper end of the insertion part (2), and the insertion part (2) is attached to a grommet. In a grommet made of a soft material such as rubber or plastic, which is designed to fit into a mounting hole and close the grommet mounting hole by covering the hole with the non-insertion part (3), the non-insertion part (3) ) around the periphery of
A plurality of arcuate grooves (6)...(6) extending from the upper surface of the non-inserted portion (3) toward the lower surface of the inserted portion (2) are connected to the partition wall portion (7).
)...(7), and the blind hole (1) and the arcuate groove (6)...(6) have a boss part (8 ) A grommet made of a soft material.