JPH0412868Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a grommet that has both functions of aeration and sealing.

<Prior Art> Generally, grommets that close holes etc. are tightly fitted into the holes and have only an air/water tight function.

<Problems to be solved by the invention> The grommet described above is also used to seal holes drilled in the body of an automobile. For example, as shown in FIG. 5E, a grommet 5 is fitted into a hole 2 made in the foil house 1. As shown in FIG. 5A, the holes 2 made in the foil house 1 are for letting air in the foil house 1 escape when the foil house 1 is electrodeposited. However, in order to spray the PVC sol 4 into the foil house 1 after electrodeposition coating, the hole 2 is covered with a masking 3 as shown in FIG. 5B to prevent the PVC sol 4 from blowing out from the hole 2. As shown in FIG. 5D, the PVC sol 4 is sprayed, and then, as shown in FIG. 5D, the masking 3 is removed and a grommet 5 is fitted into the hole 2 to seal it.

This invention enables the above electrodeposition coating without masking.
The purpose is to provide a grommet that can be sprayed with vinyl chloride sol.

<Means for Solving the Problems> The structure of the present invention to achieve the above object is that, in a grommet in which one end of the cylindrical part is open and the other end is closed by a bottom part of a required thickness, the bottom part of the grommet is closed. A small annular groove formed on the outer periphery within the wall thickness range, a wide annular groove formed on the outer periphery of the cylindrical part below the narrow annular groove, and a groove extending from the bottom of the circumferential part to the opening end. split grooves opened in the axial direction at multiple positions on the circumference of the cylindrical portion to communicate the inside of the cylindrical portion with the wide annular groove; and within the wide groove, protruding parallel to the split grooves on the outer circumferential surface of the cylindrical portion. It is equipped with a plurality of small protrusions.

<Function> According to the present invention, when the hole into which the grommet is fitted is made to have aeration and water properties, the concave groove of the cylindrical portion is fitted into the hole, and the split groove performs the aeration and water effect. Further, when the hole is sealed, the hole is sealed by the bottom by fitting the groove at the bottom into the hole.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. 10 is a grommet body. The grommet main body 10 has a bottomed cylindrical shape having a cylindrical portion 12 having an opening 13 at one end and a bottom portion 11 of a required thickness at the other end. A small annular groove 14 is provided on the outer periphery of the bottom part 11 of the grommet body 10 within the wall thickness range, and a large annular groove 14 is provided on the outer periphery of the cylindrical part 12 below the narrow annular groove 14. A groove 15 is provided.

Further, the cylindrical portion 12 has grooves 16 extending in the axial direction that communicate the cylindrical portion 12 with a wide annular groove 15 at multiple positions on the circumference between the bottom surface 11a and the end of the opening 13 in the cylindrical portion 12. Furthermore, a plurality of small protrusions 17 are provided on the outer peripheral surface of the cylindrical portion 12 within the wide annular groove 15 in parallel with the split grooves 16 .

Since the grommet of the present invention is constructed as described above, the grommet body 10 is fitted into the hole 19 made in the sheet metal member 18, as shown in FIG. When the sheet metal member 18 is positioned in the hole 19 as shown in FIG.
The grooves 16 allow ventilation and water communication. In addition, a small annular groove 14 is formed in a hole 19 as shown by B.
, the hole 19 is sealed by the bottom 11.

When the grommet of the present invention which performs the above-mentioned action is applied to the electrodeposition coating of the wheel house of an automobile body and the spraying of PVC sol, the grommet shown in Fig. 4A
As shown in , the grommet body 10 is first fitted into the hole 2 made in the wheel house 1 so that the large annular groove 15 is located in the hole 2. As a result, the air accumulated in the foil house 1 is removed from the cylindrical portion 12.
escapes to the outside of the foil house 1 through the groove 16.
Further, at this time, a small protrusion 17 protruding from the outer circumferential surface of the cylindrical portion 12 is fitted into the hole 2 in point contact with the hole 2, thereby improving the electrodeposition of the paint onto the inner circumferential surface of the hole 2.

To spray the PVC sol 4 inside the foil house 1 after the electrodeposition coating, as shown in FIG. Spray it as it is. Since this PVC sol 4 has viscosity, the split groove 1
By simply closing the hole 2 with the cylindrical part 12 of the grommet body 10 without escaping to the outside through the grommet 6, the same effect as conventional masking is achieved.

After the spraying of the vinyl chloride sol 4 is completed, the grommet main body 10 is pushed in to lock the narrow annular groove 14 in the hole 2, as shown in FIG. 4C. Thereby, the hole 2 is safely sealed by the bottom 11.

<Effects of the invention> As described above, the grommet according to the invention has a small annular groove formed on the outer periphery of the bottom, and a wide annular groove formed on the outer periphery of the cylindrical part between the bottom and the opening end. Due to the structure of the concave groove in two stages, upper and lower,
Depending on the fitting position with respect to the hole, the aeration effect is performed through the groove provided in the cylindrical part, and the sealing effect is performed by the bottom of the cylindrical part, so for example,
When used for air bleed holes, etc. required during electrodeposition painting of car body tire houses, etc., it bleeds air during electrodeposition painting, and can be done without masking when spraying PVC sol, and seals the hole at the same time. As a result, the number of man-hours for masking adhesion and peeling work can be reduced. In addition, due to the structure in which multiple small protrusions are provided on the outer circumferential surface of the cylindrical part in parallel with the split groove within the large groove, the small protrusions are fitted into the holes by point contact, and the cylindrical part is attached to the front circumferential surface of the cylindrical part. Prevents paint from adhering to the surface.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the present invention, Figure 2 is Figure 1-
3 is a sectional view taken along lines taken from FIG. 1, FIG. 4 is an explanatory diagram of the grommet of the present invention applied to a hole in a tire house of an automobile body, and FIG. 5 is an explanatory diagram of a conventional tire house electric FIG. 3 is an explanatory diagram of a coating process and a vinyl chloride sol spraying process. 10...Grommet body, 11...Bottom, 12
...Cylindrical portion, 13...Opening, 14...Narrow annular groove, 15...Wide annular groove, 16...Divided groove,
17...Small protrusion.

Claims (1)

[Scope of utility model registration request] In a grommet in which one end of the cylindrical part is open and the other end is closed by a bottom part with a required wall thickness, a narrow annular groove formed on the outer periphery within the thickness range of the bottom part, and a groove located below the narrow annular groove. a wide annular groove formed on the outer periphery of the cylindrical portion; and an axial direction that communicates the inside of the cylindrical portion with the wide annular groove at multiple positions on the circumference of the cylindrical portion from the bottom surface to the open end of the circumferential tube. A grommet comprising: a split groove formed in the groove; and a plurality of small protrusions extending parallel to the split groove on the outer circumferential surface of the cylindrical portion within the large groove.