JPH0414815Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The invention is attached to a fitting hole drilled in a panel, and fixes a wire harness inserted therein.
This invention relates to a grommet for wiring to protect.

(Prior art) When wiring a wire harness made up of a large number of electric wires into the engine room of a car, for example, a grommet is inserted into a fitting hole drilled in a panel that is a partition wall between the car interior and the engine room. mated,
The wire harness is passed through it to secure and protect the wire harness as well as to make it waterproof.

FIG. 4 is a sectional view showing a conventional grommet.

This grommet 1 has a flange portion 2, a narrowed portion 3,
It is composed of a bulging part 4 and a harness gripping part 5,
The entire body is made of elastic material and is integrally molded.

The outer periphery of the narrowed part 3 is fitted in contact with the inner periphery of the fitting hole of the panel 6, and a flange part 2 having a larger diameter than the panel fitting hole is provided on one side thereof.

On the opposite side of the narrowed part 3, a bulged part 4 having a larger diameter than the panel fitting hole extends, and the diameter of the bulged part 4 is narrowed at the tip to form a harness gripping part 5 for gripping the harness.

(Problems to be Solved by the Invention) As mentioned above, the conventional wiring grommet is entirely made of an elastic material such as rubber, and therefore has the following problems.

5. Cases where conventional grommets are inconvenient
This will be explained with reference to the figures.

The structure of the grommet 1 is the same as that shown in FIG. 4, and a wire harness 7, which is a wire cord, is inserted through the center of the grommet 1, and an insulating tape 8 is wrapped around the harness gripping portion 5 and the wire harness 7 in the vicinity thereof. has been done.

The operation of inserting the wire harness 7 into the fitting hole of the panel 6 involves first inserting the wire harness 7 into the grommet 1, positioning it, and then wrapping the harness grip part 5 and the wire harness 7 in the vicinity with insulating tape 8. Then, by inserting the wire harness 7 from the harness gripping part 5 side of the grommet 1 into the panel fitting hole (from right to left in the drawing) and further pulling the wire harness 7 strongly in the direction of arrow A, By utilizing the deformation of the bulging portion 4 of the grommet, the narrowed portion 3 is fitted into the fitting hole.

However, since the grommet 1 is entirely made of an elastic material such as rubber, when the bulge 4 passes through the fitting hole,
The flange portion 2 may also be deformed due to excessive force and may fall out of the fitting hole.

Further, even if the wire harness 7 is once locked by the flange portion 2, if the wire harness 7 is pulled in the direction of arrow A during other work, the flange portion 2 may deform and come off.

FIG. 5 shows a state in which a force in the direction A is applied to the wire harness and the entire grommet is deformed.

Once the grommet has slipped out of the fitting hole, it is difficult to pass the flange portion 2 through the fitting hole in the opposite direction, and the work must be redone, resulting in many problems.

Therefore, in this type of grommet,
The problem has been to prevent it from coming off from the fitting hole.

[Structure of the invention] (Means for solving the problems) In order to solve the above problems, the present invention takes the following measures.

That is, the grommet of the present invention consists of a flange portion on one side, a bulge portion on the other side, and a harness gripping portion extending continuously from the flange portion on the other side, sandwiching a narrowed portion whose outer periphery contacts the fitting hole of the panel. A wiring grommet integrally formed of an elastic body, characterized in that a ring groove is provided on the inner peripheral surface of the flange portion, and a hard ring having a diameter larger than the fitting hole is provided in the ring groove. It is.

The material of the hard ring used in the present invention is metal, hard resin, etc., and it is preferable to use a material that has resilience so that it maintains its shape even if one end is cut off.

The shape of the hard ring is preferably one in which one part of the ring is missing; in that case, the outer diameter of the ring in its natural state without applying force should be larger than the fitting hole of the panel, and the ring at the flange of the grommet should be It is preferably larger than the groove diameter.

(Function) The hard ring of the present invention fits into the ring groove on the inner circumferential surface of the flange portion and functions to prevent deformation of the flange against external force.

If the hard ring has a larger diameter than the panel fitting hole and part of it is missing, press it with your hand to reduce the ring diameter and then fit it, and the ring will attempt to restore its natural diameter. It spreads with force and prevents it from falling off.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Figures 1 to 3 show embodiments of the present invention;
The figure is an overall sectional view of the grommet, the second figure is a perspective view of the hard ring, and the third figure is an explanatory diagram of how to handle the ring.

In FIG. 1, the shape of the grommet 1 is almost the same as that of the conventional grommet shown in FIG. 4, and the narrowed portion 3, bulged portion 4, and harness gripping portion 5 are common.

A characteristic part of the grommet 1 of the present invention is the flange part 2, in which a ring groove 9 is provided on the inner circumferential surface of the flange part 2, and a metal ring 1 is inserted into the ring groove 9.
0 is fitted.

The inner diameter F of the ring groove 9 is larger than the inner diameter E of the fitting hole.

As can be seen in FIG. 2, the ring 10 is a partially cut-off ring.

The outer diameter G of this ring 10 in its natural state is larger than the inner diameter F of the ring groove 9. Therefore, in this state, it is impossible to fit into the ring groove 9, but since there is a missing part, if you press it with your hand to reduce the diameter and fit it into the ring groove 9, the restoring force will cause the ring groove 9 to fit. It is tightly fitted inside.

Next, the procedure for fitting the grommet of the present invention into the panel fitting hole and inserting the wire harness will be explained.

The first method is to use a complete ring without a cutout. First, the ring is fitted into the ring groove 9 of the grommet, the wire harness 7 is inserted and positioned, and then the tape is 8, the wire harness 7 is wound around the harness gripping part 5 and its vicinity, the wire harness 7 is inserted into the panel fitting hole, and the grommet 1 is passed through in the direction of arrow A, thereby fitting the narrowed part 3 into the fitting hole. At this time, since the ring 10 having an outer diameter larger than the diameter of the fitting hole is inserted into the ring groove 9 of the flange, the flange portion 2 does not deform and come out of the fitting hole.

The second method is when the ring has a cutout, and first the wire harness 7 is inserted into the grommet 1 to which the ring 10 is not fitted, and after taping, the grommet is passed through the fitting hole. Since the wall thickness of the flange portion 2 of the grommet is thin, it can be passed through either from the bulge portion 4 side or from the flange 2 side. After fitting the narrowed part 3 into the fitting hole in this way, as shown in FIG. Press down with your hand to reduce the diameter, and fit the ring 10 into the ring groove 9 of the grommet 1.

[Effects of the invention] Since the invention has the above-described configuration, it has the following effects.

(1) By providing a hard ring with an outer diameter larger than the panel fitting hole in the ring groove on the inner circumferential surface of the flange, the flange will not be deformed and the grommet will be prevented from falling out of the panel fitting hole due to external force. do.

(2) When the ring is provided with a cutout, the ring can be prevented from falling off by making the ring's natural diameter larger than the ring groove diameter.

(3) By adopting a structure in which a hard ring is fitted to the flange, the wall thickness of the flange part of the grommet can be made thinner, making it possible to save materials and reduce weight, as well as making it easier to insert into the fitting hole. become.

(4) If the ring is provided with a cutout, the ring can be fitted last, making the installation process easier.

[Brief explanation of the drawing]

Figures 1 to 3 show embodiments of the present invention;
The figure is a sectional view of the grommet, Figure 2 is a perspective view of the ring, Figure 3 is an explanatory diagram of how to handle the ring, Figures 4 to 5 show a conventional grommet, Figure 4 is a sectional view, and Figure 5 is a cross-sectional view of the grommet. is an explanatory diagram when an external force is applied to the grommet. 1... Grommet, 2... Flange part, 3...
Constriction part, 4...Bulging part, 5...Harness gripping part,
6... Panel, 7... Wire harness, 8... Insulating tape, 9... Ring groove, 10... Hard ring.

Claims (1)

[Claims for Utility Model Registration] (1) A harness grip that has a flange portion on one side, a bulge portion on the other side, and a harness grip that extends continuously from the narrowed portion where the outer periphery touches the fitting hole of the panel. In the wiring grommet, which is formed integrally with an elastic body, a ring groove is provided on the inner circumferential surface of the flange part, and a hard ring having a diameter larger than the fitting hole is provided in the ring groove. A wiring grommet featuring: (2) The wiring grommet according to claim (1), wherein a portion of the hard ring is removed, and the natural outer diameter of the hard ring is larger than the inner diameter of the ring groove.