JPH0614334Y2 - Grommet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a grommet that is fitted to a partition wall (panel) such as a door frame or a dashboard of an automobile to protect electric wires.

[Conventional technology]

Conventional grommets are generally formed of an elastic material such as synthetic rubber, and when they are used, they require troublesome work as shown in FIGS.

That is, the grommet 1 has the insertion hole 1a thinner than the electric wire 2.
(Fig. 5a), the work procedure is as follows:
Is extended by using a jig (not shown), the terminal 3 is crimped in advance and the electric wire 2 is passed through, and then the connector housing 4 is mounted (FIG. 5b). After fixing (FIG. 5c), the grommet 1 is pressed into the hole 6a of the panel 6 and the fitting groove 1b is fitted and fixed to protect the electric wire 2 and seal it.

When the electric wire 2 is, for example, a wiring for a defroster (diffoger), the connector 4 is connected to a mating terminal (not shown) on the glass 7 connected to the heat wire, as shown in FIG. 5e.

[Problems to be solved by the device]

The conventional grommet 1 requires a troublesome work of expanding the insertion hole 1a and penetrating the electric wire 2. Moreover, since the grommet 1 is often fitted in the panel hole 6a in a narrow space, the work is difficult and the electric wire 2 is bent. Moreover, as shown in FIG. 5e, the grommet 1 is easily deformed, and complete sealing is difficult.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a grommet which is easy to insert and attach an electric wire into a panel hole and has a good sealing property.

[Means for Solving the Problems]

In order to achieve the above object, the grommet of the present invention has an inner cylinder having a wire insertion groove and a locking projection on its side, and an inner cylinder housed in the panel hole as described in claim 1. The outer cylinder has a flange portion having a diameter larger than that of the panel hole at one end, the inner cylinder has a locking portion that engages with the locking projection, and the outer side of the wire insertion groove. A pressure rib that slides against the wall,
An electric wire pressing rib facing the insertion groove is provided, and a pair of flexible lock pieces engaging with the panel is provided on the outer surface.

As described in claim 2, a flange having a diameter larger than the inner diameter of the outer cylinder is provided as a stopper at one end of the inner cylinder, and as described in claim 3, the inner cylinder electric wire is provided on the inner surface of the outer cylinder. It is preferable to provide an electric wire pressing rib whose end face is curved so as to face the insertion groove, so that the electric wire can be reliably held and sealed.

[Action]

Since the grommet of the present invention is provided with the electric wire insertion groove whose upper part is opened in the inner cylinder, the electric wire can be easily inserted and set only by setting the electric wire along the groove. Further, the grommet can be fitted in the panel hole by one-touch by simply pressing the outer cylinder made of synthetic resin, and unlike elastic bodies such as synthetic rubber, it is difficult to deform, so that the sealing property is also improved.

〔Example〕

FIG. 1 is an exploded perspective view of a grommet according to the present invention, FIG. 2 is an explanatory view of an assembling method, FIG. 3a is a sectional view of the assembled state, and FIG. 3b is a plan view showing the action of the inner cylinder 11. FIG. 4 shows a cross-sectional view of the state of attachment to the panel hole.

In these figures, A is a grommet made of synthetic resin, and is composed of an inner cylinder 11 and an outer cylinder 17.

The inner cylinder 11 is a rectangular cylinder and has an electric wire insertion groove 12 in the center of the side surface thereof, and locking projections 13 are provided on the outer walls 12a on both sides of the groove 12. The wire insertion groove 12 has a U-shaped cross section, and the groove bottom is formed in a curved surface shape according to the outer diameter of the wire. It is preferable to provide at least one electric wire sealing rib 12b on the groove bottom.

Further, the inner cylinder 11 has a flange portion 14 as a stopper at the upper end, and a lightening groove 15 is provided in the lower half of the outer wall 12a, and a taper 16 for insertion guide is provided.

The outer cylinder 17 has a rectangular inner hole 18 into which the inner cylinder 11 is fitted, a locking portion 19 that engages with the locking projection 13 at the upper portion of the inner wall facing the outer cylinder 17, and a wire insertion groove in the middle. A pressing rib 20 that slidably contacts the outer wall 12a of the locking member 12 is provided.
An electric wire pressing rib 21 is vertically provided on the inner wall sandwiched by the members 9 and 19. A curved surface 21a is provided on the end surface of the wire pressing rib 21 in accordance with the outer shape of the wire.

Further, a receiving seat 22 for the flange portion 14 of the inner cylinder 11 is provided in the upper end portion of the outer cylinder 17, and a flange portion 23 having a diameter larger than the panel hole diameter is provided around the outer periphery of the receiving seat 22. A flexible lock piece 24 extending obliquely from the lower end toward the collar portion 23 is provided on the opposing outer side walls of 17.

Next, a method of using the grommet A will be described.

As shown in FIG. 2, the electric wire 2 to which the terminal 3 has been crimped in advance is inserted into the inner cylinder 1
Insert it in the wire insertion groove 12 of No. 1. Next, the terminal 3 and the electric wire 2 are passed through the inner hole 18 of the outer cylinder 17, and the inner cylinder 11 is inserted into the inner hole 18 so that the electric wire 2 and the electric wire pressing rib 21 face each other.
Push it in.

Thereby, as shown in FIGS. 3A and 3B, the inner cylinder 11 is
Both outer side walls 12a of the wire insertion groove 12 enter in a state of being pressed inward by the pressing ribs 20 as indicated by arrows, and the locking projection 13 gets over the locking portion 19 and is locked at the same time. At this time, the electric wire 2 is the electric wire pressing rib 2
1 and the groove walls 12a on both sides tighten and seal. If the groove 12b for electric wire sealing is provided on the bottom of the groove, the rib 12b digs into the insulating coating of the electric wire, so that the effect of sealing the electric wire and preventing the wire from coming off is enhanced.

Next, as shown in FIG. 4, after the connector housing 4 is attached to the terminal 3, the grommet A is attached to the O-ring 25.
It fits in the hole 6a of the panel 6 through. Grommet A
Is securely locked by the flanges 23 and the flexible lock pieces 24 located on both inner and outer surfaces of the panel 6. The grommet A does not wobble even when a tensile force like the arrow F acts on the electric wire 2,
Since the collar portion 23 is in close contact with the panel 6, the sealing property is also good,
The interposition of the O-ring 25 further improves the sealing property.

In the above, the example in which the inner cylinder 11 and the outer cylinder 17 are molded with a normal hard synthetic resin has been described. The elastic sealing member can be integrally formed on the sealing portion such as the outer peripheral surface by double molding of synthetic resin and rubber.

In this case, the sealing performance can be improved without using the packing such as the O-ring 25 described above.

[Effect of device]

As explained above, the grommet of the present invention is extremely easy to insert and attach the electric wire to the panel hole and has good workability, and unlike the conventional molded article made of an elastic body such as synthetic rubber, it is made of a hard synthetic resin. Therefore, when fitted into the panel hole, the wire is less likely to be tilted or deformed due to bending, etc., and the appearance is improved with good sealing performance.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a grommet according to the present invention, FIG. 2 is an explanatory view of the assembling method of the above, and FIGS. FIG. 4 is a plan view (b), FIG. 4 is a cross-sectional view showing a state in which the above grommet is attached to a panel, and FIGS. 5A to 5E are explanatory views showing a conventional grommet and a method of using the grommet. A: Grommet, 2 ... Electric wire, 3 ... Terminal, 6 ... Panel, 6a ... Hole, 11 ... Inner cylinder, 12 ... Electric wire insertion groove, 12b ... Rib for electric wire seal, 13 ... Stop projection, 14 ... Collar part, 17 ... Outer cylinder, 18 ... Inner hole, 19
...... Locking part, 20 ...... Pressing rib, 21 ...... Wire holding rib, 21a ...... Curved surface, 22 ...... Catch, 23 ...... Crim part,
24: Flexible lock piece.

Claims (5)

[Scope of utility model registration request] 1. An inner cylinder having an electric wire insertion groove and a locking projection on a side surface, and an outer cylinder which accommodates the inner cylinder and is fitted into a panel hole. The outer cylinder has a panel at one end. A locking portion having a flange portion having a diameter larger than that of the hole, the locking portion engaging with the locking projection on the inner surface, a pressing rib slidingly contacting the outer wall of the electric wire insertion groove, and an electric wire pressing rib facing the insertion groove. And a pair of flexible lock pieces that engage with the panel are provided on the outer surface of the grommet. 2. The grommet according to claim 1, wherein a flange portion having a diameter larger than that of the inner hole of the outer cylinder is provided at one end of the inner cylinder. 3. The grommet according to claim 1, wherein a curved surface is formed on the end surface of the electric wire pressing rib so as to match the outer shape of the electric wire. 4. The grommet according to claim 1, wherein an electric wire sealing rib is provided on the bottom of the electric wire insertion groove. 5. The grommet according to claim 1, wherein the seal portions of the inner cylinder and the outer cylinder are covered with an elastic seal member by double molding of synthetic rubber.