JP2595861Y2 - Grommets for easy wire insertion - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet used for protecting an electric wire and waterproofing the opening when an electric wire is inserted through an opening formed in a steel plate, for example.

[0002]

2. Description of the Related Art Grommets of this type are generally made of a material having rubber-like elasticity. FIG. 3 shows a conventional example of a wiring grommet used when a wire bundle is inserted into an opening of a vehicle body exterior plate, and is a side view in which the above-described vehicle body exterior plate is cut and drawn, and the wire bundle is still inserted. It represents the state which is not. The grommet 3 of this conventional example is formed by molding synthetic rubber, and a flange 3a is integrally provided. A ring groove 3b is provided on an outer peripheral surface of the flange, and is fitted to an inner peripheral edge of the wiring opening 1a of the vehicle body exterior plate 1. An electric wire insertion hole 3c for inserting the electric wire bundle 2 is penetrated through the grommet 3, and the periphery of one (right side in the drawing) opening of the electric wire insertion hole 3c protrudes in a cylindrical shape. A sleeve 3d is formed. The reason why the above-described sleeve 3d is provided will be described below. FIG. 4 is an explanatory view showing a state in which the wiring grommet of the conventional example shown in FIG. 3 is attached to an opening of a vehicle body exterior plate, a wire bundle is inserted into the wire insertion hole, and a tape is wound around a sleeve. It is. When the tape 4 is wound around the sleeve 3d and tightened while the electric wire bundle 2 is inserted through the sleeve 3d, the synthetic rubber sleeve 3d is pressed against the electric wire bundle 2 to perform a waterproof action. There are various factors for the quality of the waterproof effect by the grommet 3, but fitting relationship between the inner diameter phi ₁ of the wire insertion holes 3c of the sleeve 3d shown in FIG. 3, the outer diameter phi ₂ of the wire bundle 2 This is one of the major factors. If the fitting is loose, a waterproof effect cannot be obtained unless the fitting is performed with the tape 4. However, if the fitting is dense, it is difficult to insert the wire bundle 2 into the wire insertion hole 3c.

[0003]

The degree of fitting between the wire insertion hole 3c and the wire bundle 2 described above with reference to FIG.
It is possible to fit the wire bundle 2 as tightly as possible within a range where the wire bundle 2 can be inserted and wind the tape 4 as shown in FIG.
This is the most reasonable measure in practice. As the tape 4, a vinyl adhesive tape is generally used. In this case, in order to obtain a sufficient waterproof effect by winding the tape, the sleeve 3 shown in FIGS.
It is necessary to lengthen the length L of d to some extent.
However, if the length L is long, it is not easy to insert the wire bundle 2 shown in FIG. 3 into the wire insertion hole 3c. As described above, the main factors affecting the difficulty of insertion of the wire bundle 2, (a) the relationship between the outer diameter phi ₂ of the electric wire insertion inside diameter phi ₁ of the holes 3c and wire bundle 2, and, (B) Sleeve 3d
Is the length dimension L. In both cases (a) and (b), perfecting waterproofness and facilitating insertion are not compatible. The present invention has been made in view of the above circumstances, and can easily insert a wire bundle having an outer diameter that is not significantly smaller than the inner diameter of the wire insertion hole, and furthermore, has a short sleeve length. Not intended to provide grommets. Such a grommet can be expected to have excellent waterproofness, though the wire bundle can be easily inserted.

[0004]

SUMMARY OF THE INVENTION The grommet according to the present invention created to achieve the above object (easy insertion of an electric wire bundle) is a grommet for wiring through which an electric wire insertion hole penetrates. A spiral groove is provided on the inner peripheral surface of the electric wire insertion hole.

[0005]

According to the above structure, a spiral groove is provided on the inner peripheral surface of the wire insertion hole of the grommet, and the grommet has a shape similar to a female screw. Therefore, when a wire bundle is inserted into the wire insertion hole, The wire bundle is guided by the spiral groove and twisted naturally. Therefore, if the wire bundle is pushed while rotating so as not to oppose this guiding action, even a relatively thick wire bundle can be smoothly inserted into the wire insertion hole. For this reason, even if the grommet sleeve is relatively long, no special skill is required,
In addition, the wire bundle can be quickly and easily inserted into the grommet without spending a great deal of time and effort to protect the wire bundle and to make it waterproof.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram in which an electric wire bundle is added to a cross-sectional view of a state in which an embodiment of a grommet for easily inserting an electric wire according to the present invention attached to an opening of a vehicle body exterior plate,
It is a figure corresponding to FIG. 3 in a prior art example. FIG. 2 is a cross-sectional view of the grommet according to the above-described embodiment taken along line AA shown in FIG. FIG. 2 is a cross-sectional view of a single grommet, in which a body exterior plate and a wire bundle are omitted. This embodiment is an improvement obtained by applying the present invention to the conventional example shown in FIG. 3, and the same reference numerals as those in FIG. 3 denote the same or similar components as those in the conventional example. It is. The grommet 3 'of this embodiment has a spiral groove 3e formed on the inner peripheral surface of the wire insertion hole 3c. Thus, when the wire bundle 2 is to be pushed in the direction of arrow B, the wire bundle 2 is guided by the spiral groove 3e and receives a torsional force. If the wire bundle 2 is inserted in the same direction while rotating in the direction of the arc arrow θ without opposing the torsion force, the wire bundle 2 is smoothly inserted into the wire insertion hole 3c by an operation similar to screw feed.

[0007]

When the present invention is applied, a spiral groove is provided on the inner peripheral surface of the wire insertion hole of the grommet, and has a shape similar to a female screw. Therefore, a wire bundle is inserted into the wire insertion hole. Then, the wire bundle is guided by the spiral groove and twisted naturally. Therefore, if the wire bundle is pushed while rotating so as not to oppose this guiding action, even a relatively thick wire bundle can be smoothly inserted into the wire insertion hole. For this reason,
Even if the grommet sleeve is relatively long, it does not require any special skill and does not spend much time and effort, and quickly and easily inserts the wire bundle into the grommet to protect the wire bundle. This provides an excellent practical effect that waterproofing can be achieved.

[Brief description of the drawings]

FIG. 1 shows a grommet according to the present invention, which allows easy insertion of an electric wire.
FIG. 4 is a diagram in which a wire bundle is added to a cross-sectional view in a state where the embodiment is attached to an opening of a vehicle body exterior plate, and is a diagram corresponding to FIG.

FIG. 2 is a cross-sectional view of the grommet according to the above embodiment taken along line AA shown in FIG. FIG. 2 is a cross-sectional view of a single grommet, in which a body exterior plate and a wire bundle are omitted.

FIG. 3 is a side view showing a conventional example of a wiring grommet used when a wire bundle is inserted into an opening of a vehicle body exterior plate, and is a cut-away side view of the vehicle body exterior plate, in which the wire bundle is still inserted. It represents the state where there is no.

FIG. 4 is an explanatory view showing a state in which the wiring grommet of the conventional example shown in FIG. 3 is attached to an opening of a vehicle body exterior plate, a wire bundle is inserted into the wire insertion hole, and a tape is wound around a sleeve. It is.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body exterior board, 1a ... Wiring opening, 2 ... Wire bundle, 3
3 ': grommet, 3a: flange, 3b: ring groove,
3c: electric wire insertion hole, 3d: sleeve, 3e: spiral groove,
4: Vinyl adhesive tape, φ ₁ : Inside diameter of wire insertion hole, φ ₂ : Outside diameter of wire bundle.

Claims (1)

(57) [Scope of request for utility model registration] 1. A wire grommet having a wire insertion hole therethrough, wherein a spiral groove is provided on an inner peripheral surface of the wire insertion hole.