JPH035008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the structure of a grommet used to hold an electric wire or the like through a panel or the like.

BACKGROUND TECHNOLOGY Conventionally, grommets have been made of a flexible material such as rubber, and have a shape that allows them to fit tightly around a through hole in a panel or the like. Such a grommet has a shape as shown in FIG. 4, for example, but if a connector is attached to the tip of a conductive wire, such as when attached to a wire harness, or if multiple conductive wires are not bundled, It had the disadvantage of poor workability as it was necessary to use a grommet switch to pass the conductive wire through. Furthermore, even if the grommet b is attached to the conductive wire a, it is necessary to further wrap an adhesive tape d around the penetrating neck c in order to obtain a waterproof structure, making it difficult to reduce the number of work steps.

Problems to be Solved The present invention aims to eliminate these drawbacks of conventional grommets and realize a grommet structure that is easy to attach to conductive wires and panel holes and has excellent waterproof performance. It is.

Means for Solving the Problems In order to achieve the above objects, the present invention has the following features:
A grommet having a conductive wire through hole and a locking claw for a panel hole, the grommet member made of a hard elastic material having a shape divided into two along the axis of the conductive wire through hole surrounds the conductive wire and is connected to the grommet. The grommet structure is constructed by abutting and integrating the grommet member and the conductive wire by providing a covering layer made of a soft elastic material on the outside of the grommet member and the conductive wire.

The hard elastic material for forming the grommet member in the present invention is strong, such as ABS resin, high impact styrene resin, vinyl chloride resin, or acrylic resin, and has good adhesive properties with the soft elastic material for coating. Good plastic materials are preferably used.

Further, a grommet member made of such a hard elastic material is formed by injection molding, for example, into a shape in which a completed grommet is divided into two along a plane passing through the axis. Preferably, the molded parts are provided with locking parts, such as engaging pawls and engaging holes, at corresponding positions for assembling the two parts together, or the two parts can be assembled into a flexible hinge part. They may be twisted and formed into a connected shape, and then folded and assembled into one piece.
When assembling the grommet member, it goes without saying that the wire harness must be fitted into the shaft hole before assembly.

The soft elastic material used to cover the surface of the grommet member after it is assembled is a material that is flexible and has good adhesion to the hard elastic material constituting the grommet member, such as soft vinyl chloride resin, soft polyurethane, or silicone rubber. is preferably used. When coating these materials, for example, in the case of vinyl chloride resin, the member is immersed in a plastisol-like composition, or in the case of silicone rubber, it is immersed in a liquid unvulcanized compound, etc., and the appropriate coating is applied. By performing curing treatment at appropriate temperatures and times, it is possible to obtain coatings that meet each purpose. Note that these coating compositions may contain a solvent and the like.

Embodiment FIG. 1 is a sectional view showing the grommet structure of the present invention, in which 1 is a wire harness, 2 is a grommet member, 3 is a covering, and 4 is a mounting panel.

The grommet member 2 has a structure shown in FIG. 2 and is made of hard synthetic resin. 2a is a conductor through hole, 2b is a concentric annular groove provided on the lower surface of the base, 2c is a cylindrical part for fitting into a hole in the panel,
Reference numeral 2d designates an engaging claw for engaging the edge of a panel hole provided in the notch 2e around the cylindrical portion 2c. 2f
2g is a hinge for connecting the divided members, and 2h is a lock for assembling the members together.

The grommet member 2 is assembled as shown in FIGS. 3a, b, and c. That is, the wire harness 1 is inserted into the through hole 2a of the grommet member 2, and connected by a lock 2h provided on the edge of the abutting surface of the member (FIG. 3a→b). Then, the grommet part is immersed in the dipping tank 5 filled with vinyl chloride resin plastisol, and the plastisol permeates not only the surface of the grommet part but also the gap between the wire harness member 1 and the grommet member 2 (Fig. 3c). . The grommet part with plastisol attached to the surface is 130
It is cured by heat treatment at temperatures on the order of °C to produce a soft coating.

In the thus obtained grommet, if the connector provided at the end of the wire harness 1 is passed through the hole in the mounting panel 4 and then the cylindrical portion 2c is inserted, the engaging claw 2d will fit into the edge of the panel hole. However, there is a soft elastic coating layer between the front surface of the panel 4 and the lower surface of the grommet 2, which, together with the action of the annular groove 2b on the lower surface of the grommet 2, provides good waterproofing. form a structure.

Effects of the Invention The grommet structure of the present invention is easy to attach to a wire harness, does not require any special tools, and is not only extremely easy to work with, but also has good waterproof properties and can be easily attached to a panel. It can be implemented efficiently.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the grommet structure of the present invention, Fig. 2a is a bottom view of the member, and Fig. 2b is its A-A
In the sectional views, FIGS. 3a and 3b are views showing the assembly procedure, similarly, FIG. 3c is a view showing its immersed state, and FIG.

Claims (1)

[Claims] 1 A grommet having a conductive wire through hole and a locking claw for a panel hole, wherein a grommet member made of a hard elastic material and divided into two along the axis of the conductive wire through hole surrounds the conductive wire. A grommet structure characterized in that the grommet member and the conductive wire are abutted and integrated through the surface, and a covering layer made of a soft elastic material is provided on the outer surface of the grommet member and the conductive wire.