JPH07220547A - Grommet - Google Patents

Abstract

PURPOSE:To provide a grommet which does not come out of an article in which it is installed, has excellent assembly workability, and can be installed easily even if the plate thickness of a hole in which it is to be fixed differs slightly. CONSTITUTION:A grommet is composed of a circular main body part 11 and an insertion hole 12, wherein the main body part is to be inserted into assembly hole of an article in which the grommet is to be installed and the hole 12 penetrates the main body part 11 and into the hole a cable is to be inserted. The main body part 11 has a flange part 13 extended outward in one side, and in the other side, the grommet has a plurality of claw parts 14 to be jointed to the article in which the grommet is to be installed. The claw parts 14 have cut parts 140 in both sides and the claw parts 14 also have projected jointing claws 141, and between the jointing claws 141 and the flange part 13, the claw parts 14 have fitting parts 142 to be fitted in the article in which the grommet is to be installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet provided on a ceiling of a building for convenience of wiring such as electric wiring.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, when a cable 5 such as an electric wire or a telephone line is laid on a ceiling of a building, a ceiling unit 8 is first prepared in a factory. The cable 5 is wired to the beam 81 provided in the unit 8. After that, the unit 8 is transported to a construction site, and the unit 8 is assembled on the ceiling or the like.

When wiring the cable 5 to the unit 8, first, an assembling hole 80 is provided in the beam 81, and a rubber grommet 9 is fitted therein. Then,
As shown in FIG. 6, the cable 5 is inserted into the hole 92 of the grommet 9. As a result, the cable 5 can be fixed to the unit 8 at a fixed position.
The grommet 9 is made of rubber to prevent electric leakage.

The grommet 9 has the following structure as shown in FIG.
It is a substantially C-shaped rubber extruded product having an end portion 93. Further, the outer periphery thereof has a fitting recess 94 for fitting in the assembly hole 80. The grommet 9 is manufactured by cutting a rubber material extruded into a long shape into a desired length and bending the cut rubber material into a C shape. As shown in FIG. 8, when assembling the grommet 9 into the assembling hole 80 of the beam 81, first, the grommet 9 is introduced into the assembling hole 80 while being deformed, and the whole assembly is pressed in order while being fitted. The protrusions 940 on both sides of the mating recess 94 are engaged with the assembly hole 80.

[0005]

However, since the grommet 9 has the end portion 93, there is a problem in that the grommet 9 is easily detached from the assembly hole 80 starting from the end portion 93. Therefore, in order to hold the grommet 9, as shown in FIG. 6, the gum tape 7 must be attached to the beam 81 so as to cover the end 93 of the grommet 9. Furthermore, it is necessary to fit the grommet 9 while pressing the fitting recess 94 along the assembling hole 80. Therefore, the assembly of the grommet 9 is troublesome.
If the thickness of the beam 81 is small, a gap is created between the assembly hole 80 and the fitting recess 94 of the grommet 9. Therefore, the grommet 9 is likely to come off.

Further, if the thickness of the beam 81 is larger than the fitting recess 94, it becomes difficult to fit the grommet 9. Therefore, it is necessary to prepare a plurality of grommets 9 in which the size and the like of the fitting recess 94 are different for each thickness of the beam 81.
In view of such problems, the present invention is to provide a grommet which does not come off from the material to be assembled, has excellent workability in assembly, and can be easily mounted even if the thickness of the material to be assembled is slightly different. is there.

[0007]

The present invention comprises an annular main body for inserting into an assembling hole of a material to be assembled, and an insertion hole for penetrating the main body and inserting a cable or the like. The main body portion has an outwardly facing flange portion on one surface thereof, while the other surface of the main body portion has a plurality of tab portions for engaging with the member to be assembled, and on both sides of the tab portion. Has a cutout portion, the claw portion has a protruding engaging claw, and a fitting portion for fitting the assembly target material between the engaging claw and the flange portion. The grommet is characterized by having.

The outer shape of the main body is arbitrary, such as a circle, an ellipse, or a quadrangle. Next, it is preferable that the main body portion, the flange portion and the claw portion are integrally formed of synthetic resin or rubber. By using synthetic resin or rubber,
The elasticity of the whole is improved, and it is easy to assemble it in the target hole. Furthermore, even if the fitting part is slightly larger than the assembly hole,
Assembly is possible. An example of the integral molding method is an injection molding method.

Further, by integrally molding the entire grommet such as the main body portion, the manufacturing is facilitated, which is most suitable for mass production. Next, it is preferable that each of the main body portion and the claw portion has a taper portion on its outer peripheral portion, which taper toward the tip. This makes it easy to insert the grommet into the assembly hole of the assembly target material.

[0010]

FUNCTION AND EFFECT In the grommet of the present invention, the main body is an endless ring. For this reason, the entire grommet is always held in a ring shape. Therefore, when the grommet is fitted into the assembling hole of the material to be assembled, the grommet does not come off from its end unlike the conventional product. Further, the grommet is fitted so that the flange portion and the claw portion are sandwiched around the assembly hole. Therefore, the grommet will not come off from the mounting hole. Further, a cutout portion is provided around the claw portion. For this reason, the engaging claws of the claw portion have elasticity, and when the engaging claws are fitted into the assembling holes of the material to be assembled, the engaging claws are easily distorted and the fitting work is difficult. It will be easy.

Further, the grommet of the present invention, when inserted into the assembling hole of the assembling material, engages with the assembling material by the fitting portion between the flange portion and the engaging claw of the claw portion. Are combined.
Therefore, even if the material to be assembled has a slightly different thickness, it can be easily mounted. As mentioned above, according to the present invention,
It does not come off from the material to be assembled, it has excellent workability in assembly,
It is possible to provide a grommet that can be easily mounted even if the thickness of the material to be assembled is slightly different.

[0012]

【Example】

Example 1 FIGS. 1 to 3 of a grommet according to an example of the present invention.
Will be explained. The grommet 1 of this example includes an annular main body 11 for inserting into the assembly hole 80 of the assembly target material, and an insertion hole 12 for penetrating the main body 11 and inserting a cable or the like. The main body portion 11 has a flange portion 13 that extends outward on one surface thereof, and has three claw portions 14 that engage with the member to be assembled on the other surface of the main body portion 11.

Further, notches 140 are provided on both sides of the claw portion 14. The claw portion 14 has a protruding engaging claw 141, and a fitting portion 14 for fitting a material to be assembled between the engaging claw 141 and the flange portion 13.
Have two. The main body portion 11 and the claw portion 14 each have a tapered portion 15 on the outer peripheral portion thereof, which is tapered toward the tip. Reference numeral 130 is a molding hole generated by a mold portion for forming the claw portion 14 during the injection molding of the grommet 1.

Next, the function and effect of this example will be described. The grommet 1 is a unit 8 as a material to be assembled.
At the time of assembling (see FIG. 5), holding the side having the flange portion 13 toward you, the main body portion 11 is pushed in parallel to the assembly hole 80 of the unit 8. A taper portion 15 is provided at the tip of the main body 11, and notches 140 are provided on both sides of the claw portion 14. for that reason,
At the time of assembling the grommet 1, the claw portion 14 easily bends, and the assembling can be performed with one touch.

Then, as shown in FIG. 3, the flange portion 13 and the engaging claw 141 firmly clamp the wall surface of the assembly hole 80 from both sides thereof. Therefore, the grommet 1 is strongly fixed in the assembling hole 80, and the engaging claw 141 receives the pulling force toward the front and the flange portion 13 receives the pushing force. Therefore, it does not come off easily. Also,
It can be easily installed even if the thickness of the material to be assembled is slightly different. The grommet 1 is made of rubber and has a large elasticity and restoring force.
Therefore, the grommet 1 can be easily assembled by applying the grommet 1 to the assembling hole 80 and pressing it.

The grommet 1 is integrally molded by injection molding. Therefore, the production cost can be reduced.
Further, the engaging claw 141 of the claw portion 14 is the flange portion 1
It is bent in the direction of 3 (Fig. 2). However, by providing the molding hole 130, the engagement claw 141 can integrally mold the grommet 1 by a pair of upper and lower molds. Therefore, the mold can be divided into two, and the mold structure is simple. Therefore, according to this example, it is possible to provide a grommet which does not come off from the material to be assembled, has excellent workability in assembly, and can be easily mounted even if the thickness of the material to be assembled is slightly different.

Embodiment 2 As shown in FIG. 4, this embodiment is an example of assembling when the material to be assembled is thicker than the fitting portion 142 of the grommet 1. The grommet 1 of this example has the same shape and size as those of the first embodiment. That is, since the grommet 1 is made of rubber, it has large elasticity and restoring force. Therefore, even if the interval of the fitting portion 142 between the flange portion 13 and the engaging claw 141 is slightly smaller than the thickness of the unit 8 to be assembled, the engaging claw 141 is large as shown in FIG. Bend and fit. Therefore, it is possible to fit a thick assembly material. Therefore, the grommet 1 of this example does not need to be manufactured in different sizes according to the thickness of the material to be assembled, and is excellent in versatility.

[Brief description of drawings]

FIG. 1 is a perspective view of a grommet according to a first embodiment.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a mounted state of a grommet in the first embodiment.

FIG. 4 is a cross-sectional view showing a mounted state of a grommet in the second embodiment.

FIG. 5 is a perspective view showing wiring of a cable using a conventional grommet.

FIG. 6 is a front view showing a mounting state of a conventional grommet.

FIG. 7 is a perspective view of a conventional grommet.

FIG. 8 is a cross-sectional view showing a mounting state of a conventional grommet.

[Explanation of symbols]

 1. ． ． Grommet, 11. ． ． Body part, 12. ． ． Insertion hole, 13. ． ． Flange portion 14. ． ． Claw portion, 140. ． ． Engaging claws, 141. ． ． Notch, 15. ． ． Taper part, 80. ． ． Assembly hole,

Claims (3)

[Claims] 1. An annular main body for inserting into an assembling hole of a material to be assembled, and an insertion hole for passing a cable or the like through the main body and the main body is One side has a flange portion facing outward, and the other side of the main body portion has a plurality of claw portions to be engaged with the assembly target material.
The claw portion has notches on both sides, and the claw portion has a protruding engaging claw, and a fitting member is fitted between the engaging claw and the flange portion. A grommet having a fitting portion for mating. 2. The grommet according to claim 1, wherein the main body portion, the flange portion and the claw portion are integrally formed of synthetic resin or rubber. 3. The grommet according to claim 1, wherein the main body portion and the claw portion have a taper portion on their outer peripheral portions that shrink toward the tip.