JPH10261334A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To design a grommet so as to be inserted in through holes of various bores made through panels while holding its size compact. SOLUTION: A grommet 12 comprises a tubular reversible body part 13 with elasticity, in which an electric wire is inserted. The body part 13 is formed in its inner and outer peripheries with plural fitting grooves 14 and 15 of different depths, and at its insertion opening 16 for electric wires with a rib 18 extending perpendicularly to the insertion direction of electric wires so as to be reversed together with the body part 13. The body part 13 being reverted thus exposes both the fitting grooves 14 and 15 outside to fit to through holes of various bores. That formation requires no elongation of the body part 13 or no enlargement in its size.

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 routing electric wires such as a wire harness to an automobile or the like.

[0002]

2. Description of the Related Art When an electric wire such as a wire harness is drawn from an engine room into a vehicle interior, it is necessary to penetrate the electric wire through a panel such as a dashboard. The grommet is attached to the wire portion of the panel.

FIG. 6 shows a general grommet, in which an electric wire insertion hole 2 is formed in the axial direction of a cylindrical main body 1, and an outer surface at one end side of the main body 1 is connected to a panel (not shown). A fitting groove 3 for attachment is formed. The other end of the main body 1 serves as an insertion port 4 into which the electric wire is inserted and closely attached to the electric wire. The fitting groove 3 is formed to have a width and a depth that fits into the through hole formed in the panel. The fitting of the fitting groove 3 fixes the panel to the panel and performs waterproofing. I have.

However, this grommet has one fitting groove 3.
Due to the strip, there is an inconvenience that it cannot be attached to a through hole formed in the panel so that the hole diameter is different.

On the other hand, Japanese Utility Model Application Laid-Open No. S59-47181 discloses a grommet which can be applied to through holes having different hole diameters. 6 and 7 show the grommets 5 and 6 described in this publication, respectively.

The grommets 5 and 6 form a plurality of fitting grooves 8, 9 and 10 on the outer surface of a cylindrical main body 7, and the plurality of fitting grooves 8, 9 and 10 The parts are arranged at intervals along the axial direction of the part. Adjacent fitting grooves 8, 9, and 10 have different amounts of outward protrusion due to steps 11 formed in main body 7. As a result, the fitting grooves 8, 9, and 10 can be fitted into through holes having different hole diameters, respectively, and a single grommet can be applied to through holes having different hole diameters.

[0007]

However, the grommets 5, 6 shown in FIGS. 6 and 7 have a plurality of fitting grooves 8,
In order to form 9, 9 along the length direction of the main body 7,
Since the length of the main body 7 is increased and the protrusion amounts of the fitting grooves 8, 9, and 10 are made different, the diameter of the main body 7 is increased. This increases the overall size of the grommet, requiring more space for mounting.
In addition, a large amount of resin is required for molding the grommet, which increases the weight and reduces the handleability, and also increases the cost.

The present invention has been made in view of such conventional problems, and the structure which can be applied to through holes having different hole diameters is increased in size and weight. It is intended to provide a compact grommet without any trouble.

[0009]

In order to attain the above object, according to the first aspect of the present invention, a plurality of fittings of different depths are provided in which a cylindrical main body through which an electric wire is inserted has reversible elasticity. The attachment groove is formed on the inner surface and the outer surface of the main body.

The fitting grooves on the inner surface and the outer surface of the main body have different depths, so that the fitting grooves on the outer surface of the main body correspond to the through holes of the panel. Fits. With respect to through holes having different hole diameters, the main body can be turned over and the fitting grooves on the inner surface side can be exposed and fitted.

Although a single grommet can be applied to through holes having different hole diameters, the fitting grooves are formed on the inner surface and the outer surface of the main body. Need not be lengthened, and the need to increase the diameter of the main body is eliminated. Therefore, the grommet does not become large and the weight does not increase, so that the handleability is improved and the mounting space is not required widely.

According to a second aspect of the present invention, in the first aspect of the present invention, a rib extending in a direction intersecting with the insertion direction of the electric wire is formed at an insertion opening of the electric wire provided in the main body. Can be turned over together with the body.

The rib formed at the insertion opening portion of the electric wire is turned upside down together with the body portion, and the space between the ribs becomes an insertion opening by turning over. Therefore, since the original insertion opening and the insertion opening formed by the ribs are formed to be reversible, it is possible to adhere to electric wires having different outer diameters.

According to a third aspect of the present invention, in the first or second aspect, a thick portion is formed in the main body portion, and the plurality of fitting grooves are formed on an inner surface and an outer surface of the thick portion. It is characterized by having.

When the main body is turned over, the thick part is also turned over. Before the inside out and after the inside out, the thickness of the thick portion protrudes from the main body portion depending on the thickness, and the fitting grooves formed on the inner surface and the outer surface of the thick portion also have different protruding amounts. Therefore, fitting can be performed for through holes having different hole diameters.

A fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein the plurality of fitting grooves are formed at positions displaced along the insertion direction of the electric wire. Features.

By arranging the fitting grooves at shifted positions, the thickness of the main body can be ensured and a strong grommet can be obtained.

[0018]

1 to 4 show one embodiment of the present invention. FIG. 1 is a cross section before turning over, FIG. 2 is a cross section after turning over, and a grommet 12 has a cylindrical main body. 13, and a plurality of fitting grooves 14 and 15 formed in the main body 13.

The main body 13 is made of an insulating resin and has reversible elasticity, and an electric wire such as a wire harness (not shown) is inserted therein.
One end of the main body 13 is an insertion port 16 into which the electric wire is inserted and closely attached to the electric wire, and the other end of the main body 13 is attached to a panel (not shown). The other end is a thick portion 17 having a larger amount of resin than other portions.

The fitting grooves 14 and 15 are provided with a thick portion 17 on the other end side.
Is formed. The fitting grooves 14 and 15 have different depths with respect to the thick portion 17, and thus correspond to through holes having different hole diameters formed in the panel.
In a state before the body portion 13 is turned over, as shown in FIG.
Although the fitting groove 15 is located on the outer surface of the main body 13 and the fitting groove 14 is located on the inner surface of the main body 13, the fitting groove 14 is located on the outer surface as shown in FIG. , Fitting groove 15
Is located on the inner surface.

In this case, the fitting grooves 14 and 15 are formed at positions shifted along the direction in which the electric wires are inserted. Fitting groove 1
When the wires 4 and 15 are formed at the same position as the wire insertion direction, a thin portion is partially formed in the thick portion and the strength is reduced. Since it does not become extremely thin and the strength does not decrease, large durability can be imparted.

Further, a rib 18 is formed in the insertion slot 16 into which the electric wire is inserted. The rib 18 extends in a direction that intersects with the wire insertion direction, in this embodiment, a direction that is orthogonal. The rib 18 is located outside the insertion slot 16 as shown in FIG. 1 before the body part 13 is turned upside down, and extends outward. However, after the flip upside down, as shown in FIG. Located in. In this state, the rib 18
The space between them becomes the insertion port of the electric wire, and the diameter of the insertion port 16 becomes small.

In such a grommet 12, before the body 13 is turned over, the fitting groove 15 having a large depth is located on the outer surface of the body 13, as shown in FIGS. 1 and 4 (a). ing. The fitting groove 15 corresponds to a through hole having a small hole diameter on the panel side, and the fitting groove 15 fits into a small through hole having a small hole diameter, and the fitting allows the grommet 12 to be fixed to the panel. In the state before the upside down, as shown in FIGS. 1 and 3A, the insertion opening 16 maintains the original diameter, and is tightly attached to an electric wire having a relatively large outer diameter.

On the other hand, FIG.
A force F in the direction shown in FIG. The main body 13 is turned upside down by this force F. FIGS. 2 and 4B show this state. The fitting groove 15 moves to the inner surface of the main body 13, while the fitting groove 14 is located on the outer surface of the main body 13.
The fitting groove 14 has a small depth, corresponds to a through hole having a large hole diameter on the panel side, and is fitted and fixed to the through hole.

Also, with the main body 13 turned over, the insertion slot 1
Since the six portions are also turned over, the rib 18 is located inside the insertion slot 16 as shown in FIGS. 2 and 3B. The space between the ribs 18 is relatively narrow, and the space between the ribs 18 serves as an insertion port. For this reason, even if an electric wire having a relatively small outer diameter is inserted, it can be in close contact with the electric wire.

In such an embodiment, the panel can be fitted into through-holes having different hole diameters by turning the body over and turning it over. Moreover, since the fitting grooves for fitting are formed on the inner surface and the outer surface of the main body, it is not necessary to lengthen the main body for the arrangement of the fitting grooves, and it is not necessary to increase the diameter of the main body. . For this reason, the size may be about the same as that of the general grommet shown in FIG. 5, the handling is improved, and a large mounting space is not required.

[0027]

As described above, according to the first aspect of the present invention, since the main body is turned over to switch to a different fitting groove, the present invention can be applied to through holes having different hole diameters of the panel. Moreover, since the fitting grooves are formed on the inner surface and the outer surface of the main body, it is not necessary to lengthen the main body for arranging the fitting grooves, and it is not necessary to increase the diameter of the main body. It is easy to handle and does not require a large mounting space.

According to the second aspect of the present invention, the rib formed at the insertion opening portion of the electric wire is turned upside down together with the inside-out of the main body to form the insertion opening. Therefore, it is possible to switch between the insertion opening having the original diameter and the insertion opening having the diameter formed by the ribs, and it is possible to adhere to the electric wires having different outer diameters.

According to the third aspect of the present invention, since the fitting groove is formed in the thick portion of the main body, the inside of the thick portion is turned over,
The protrusion amounts of the fitting grooves are different, so that the fitting grooves can be fitted to through holes having different hole diameters.

According to the fourth aspect of the present invention, since the fitting groove is located at a shifted position, the thickness of the main body can be secured, and a grommet having high strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention before turning over.

FIG. 2 is a cross-sectional view of the embodiment after turning over.

FIGS. 3A and 3B are cross-sectional views showing a change in an insertion port portion.

FIGS. 4A and 4B are cross-sectional views showing switching of fitting grooves.

FIG. 5 is a cross-sectional view of a conventional general grommet.

FIG. 6 is a cross-sectional view of an improved conventional grommet.

FIG. 7 is a cross-sectional view of another modified conventional grommet.

[Explanation of symbols]

 12 grommet 13 main body 14 15 fitting groove 16 insertion port 17 thick part 18 rib

Claims (4)

[Claims] 1. A tubular body through which an electric wire is inserted has reversible elasticity, and a plurality of fitting grooves having different depths are formed on an inner surface and an outer surface of the body. And grommet. 2. The invention according to claim 1, wherein a rib extending in a direction intersecting with the insertion direction of the electric wire is formed at an insertion port portion of the electric wire provided in the main body portion, and the rib is formed on the main body portion. A grommet characterized by being able to be turned inside out. 3. The invention according to claim 1, wherein a thick portion is formed in the main body portion, and the plurality of fitting grooves are formed on an inner surface and an outer surface of the thick portion. And grommet. 4. The grommet according to claim 1, wherein the plurality of fitting grooves are formed at positions shifted along a direction in which the electric wire is inserted.