JPH07110090B2 - How to wear and waterproof grommets - Google Patents

Description

The present invention relates to a grommet mounting method and a waterproofing method.
More specifically, the present invention relates to a grommet mounting and waterproofing method which is excellent in mounting workability and waterproofness.

[Conventional technology]

Grommets are used as rubber eyelets when inserting wiring cords through holes in walls, sheets, etc.The grommets that insert wiring cords, etc., protect the cords etc. from damage. It also has the function of preventing the cord from wobbling inside the hole.

For example, as shown in FIGS. 4 to 5, a bundle 14 of wiring cords running through a hole drilled in a wall 13 between an engine room side 11 (or a trunk room side) and a room side 12 of an automobile is grommeted. In the case where the grommet is housed and mounted inside, gaps having a constant inner diameter that penetrate through the obstacles and the branches 18 and 19 shown by reference numerals 16 and 17 in the longitudinal direction of the grommet must be inserted. For this reason, the grommet 15 is integrally molded with a soft resin or rubber, and the work of pulling out the bundle of wiring cords is performed with great effort and time.

After that, a vinyl tape 20 is generally wound around the bundle 14 of wiring cords at the end of the grommet for waterproofing. The waterproof treatment with such vinyl tape may cause uneven winding, or the tape may come off,
There are problems in waterproofness and durability, and there is almost no waterproofing effect against water rising from the gap of the wiring cord bundle due to the capillary phenomenon.

[Problems to be solved by the invention]

Therefore, the inventors of the present invention have conducted various studies in search of a method for improving workability and waterproofness when the grommet is attached, and as a result, use a grommet provided with a slit slit portion to store a bundle of wiring cords therein. It was found that such a problem can be effectively solved by heat-sealing the slit surfaces to each other in such a state and then filling the gap portion of the wiring cord bundle at the end of the grommet with foam resin or rubber.

[Means for solving problems]

Therefore, the present invention relates to a method for mounting and waterproofing a grommet, and for mounting and waterproofing a grommet, a grommet provided with a slit slit portion in its length direction is expanded at the slit slit portion, and a bundle of wiring cords is stored therein. In this state, the slit slit surfaces are heat-sealed together, and then a foaming liquid is injected into the gap portion of the wire cord bundle at the end of the grommet, and the gap portion is filled with foam resin or rubber.

Grommet with a slit slit part in its length direction,
It is formed of a soft resin or rubber such as polyurethane, polyester, and soft vinyl chloride. The slit slit portion is formed during or after molding. Since these molding materials must be thermoplastic in order to be heat-sealed and the slit slit portion is expanded and used, an elastic body having a hardness of about 60 to 98 degrees (JIS A) is used. Is commonly used.

The mounting of the grommet provided with the slit slit portion is performed by the method shown in FIGS. That is, the slit slit portion 2 provided on the grommet 1 in the length direction thereof.
Is spread by hand and the bundle 3 of wiring cords is stored therein, and the slit slit surfaces 4, 4'are heat-sealed together by using a hot plate or the like.

The grommet storing the bundle of wiring cords in this manner is fitted into the adhered portion by utilizing the groove portion 5 in the cylindrical direction, but generally, prior to that, the waterproofing of the bundle of wiring cords at the end of the grommet is performed. Processing is performed.

For this waterproofing treatment, as shown in FIG. 3, for example, a syringe or the like is used or a small hole is made at the end of the grommet, and the foaming liquid is injected into the gap portion of the wiring cord bundle 3 inside the grommet, and this gap Foam is formed in the gap between the portion and the grommet, and these gaps are filled with foam resin or rubber 6, for example, foamed polyurethane resin or rubber.

〔The invention's effect〕

According to the method of the present invention, since the grommet provided with the slit slit portion is used to store the wiring cord and the like therein, the slit slit surfaces are inserted only by heat-sealing, so the work at the time of mounting The properties are remarkably improved, and the functionally equivalent to the conventional one can be obtained. Further, since the waterproof treatment at the end of the grommet is performed by filling with foam resin or rubber, no problem is observed in waterproofness and durability, and especially the waterproofing effect against the capillary phenomenon from the gap portion is sufficient, It can save labor and time. And this method can be applied not only to the wall body of the automobile but also to the grommet for sealing generally applied to the hole formed in the wall that blocks the two chambers.

[Brief description of drawings]

1 to 3 are perspective views showing an application procedure of the method of the present invention. Further, FIG. 4 is a cross-sectional view of the grommet fitting portion, and FIG. (Explanation of symbols) 1,15 …… Grommet 2 …… Clit slit part 3,14 …… Wiring cord bundle 4 …… Clit slit surface 6 …… Foam resin or rubber

Claims (1)

[Claims] 1. A grommet provided with a slit slit portion in its length direction is expanded at the slit slit portion, and a bundle of wiring cords is accommodated therein, and the slit slit surfaces are heat-sealed together. A method for mounting and waterproofing a grommet, which comprises injecting a foaming liquid into a gap portion of a wire cord bundle at an end of the grommet and filling the gap portion with a foam resin or rubber.