JPH08336224A - Grommet - Google Patents

Abstract

PURPOSE: To obtain a grommet which can be fitted to a panel while ensuring good sealing performance regardless of fluctuation in the dimensional error of burring or the thickness of panel and can be fitted to the panel with high workability. CONSTITUTION: A hard lock member is fitted, at the circumferential part thereof, in an annular recess 19 made in the outer circumference of a soft grommet body 12 to assemble a grommet 11. The lock member is proved, on one side face of flange part 16 thereof for forming the annular recess 19, with a part 17 touching the annular part to be deformed elastically and, on the other side face of flange part 16, with a tongue part 18 touching the side face of a panel and sealing the gap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is frequently used when sealing an electric wire through hole provided in a panel or the like.

[0002]

2. Description of the Related Art In various electronic devices, automobiles, and the like, grommets are used for waterproofing when a wire is passed through a panel or chassis or for preventing a short circuit between the wire and the panel or chassis. There are various types of grommets, some of which have a simple structure of a single part, and some of which are called two-part grommets as described below. 6 and 7 are enlarged cross-sectional views of a main part showing an example of a conventional two-component grommet. A grommet 1 is a grommet body 2 formed of an elastic body such as rubber, and a lock member 3 integrally formed of synthetic resin. It is composed by. The grommet main body 2 is formed into a substantially disc shape, the outer periphery thereof is folded back toward the center direction corresponding to the left side of the figure, and the flexibly deformable tongue portion 4 is doubled on the lower surface thereof at a predetermined interval. Has been done. Then, the annular portion 5 of the lock member 3 is fitted into the recess formed by the folding back, the lock member 3 is held in the assembled state, and the grommet 1
Can be assembled into a predetermined shape.

When the grommet 1 is mounted on the panel 6, the bottom portion 7a of the lock portion 7 provided flexibly and deformable on the lock member 3 is inserted into the through hole 6a formed in the panel 6, and the outer inclined surface portion 7b is formed through the through hole. Push in the direction of the arrow X while being in contact with the edge of 6a. As a result, the entire lock portion 7 is flexed and deformed in the central direction, and the lock portion 7 is locked at the stage where the burring 6b formed at the peripheral edge of the through hole 6a is locked by the notch-shaped locking portion 7c formed at the upper end of the lock portion 7. The whole is returned to the outside, that is, rightward in FIG. 6, and the mounting of the grommet 1 is completed.
In this state, the tip of the tongue 4 elastically contacts the surface of the panel 6 near the through hole 6a, and the sealing property for waterproofing or the like is maintained.

[0004]

By the way, the burring 6b
Since the height of the burring varies depending on manufacturing, the burring 6
The length of the tongue 4 must be set so that the tongue 4 can be brought into close contact with the surface of the panel 6 even if the height dimension of b is the minimum dimension A as shown in FIG. On the other hand, when the grommet 1 is attached to the panel 6 in which the height of the burring 6b is set to the maximum dimension C as shown in FIG. 7, the tongue portion 4 is below the hard annular portion 5 and is between the panel 6 and the tongue portion 4. Overlapping,
The folded portion 2a of the grommet body 2 is in close contact with the annular portion 5 and is compressed. Therefore, even if the lock member 3 is pushed in the direction of the arrow X for mounting, it becomes difficult for the lock member 3 to enter the through hole 6a from the middle, and the notch-shaped locking portion 7c is engaged with the through hole 6a to mount the grommet 1. Requires a strong force, resulting in poor workability when installing the grommet. Note that Japanese Utility Model Laid-Open No. 63-63914 discloses an example of a “grommet” having a similar structure. The disclosed grommet relates to a structure for preventing the grommet from falling off from the panel when an external force is applied. However, it does not improve workability when the panel is mounted. It is an object of the present invention that even if there is variation in the dimensional error of the burring of the panel on which the grommet is mounted, or even if the panel has a different plate thickness, it can be mounted with a good sealing property and is excellent in workability during mounting. The purpose is to provide grommets.

[0005]

In order to achieve the above object, the structure of the grommet according to the present invention is such that the annular portion provided on the hard lock member is fitted into the annular recess formed on the outer periphery of the soft grommet body. One side surface of the flange portion forming the annular recess in the grommet which is assembled as a unit and is inserted into the through hole formed in the panel by inserting the elastic lock portion provided in the hard lock member at a desired interval into the through hole provided in the panel. It is characterized in that an elastic portion that comes into contact with the annular portion is formed at least at a position corresponding to the lock portion, and a tongue portion is formed on another side surface.

[0006]

When the grommet is attached to the panel, one end of the lock member is inserted into the through hole formed in the panel and pushed, the lock portion is elastically deformed by pushing, and then the lock portion is inserted at a predetermined position. Put it back in its original shape. At the time of this mounting, the tongue portion and the flange portion are biased toward the annular portion side according to the pushing amount, but the elastic portion is formed at a position corresponding to at least the lock portion on the surface of the flange portion that contacts the annular portion. Therefore, the elastic portion is pressed against the annular portion by the biasing force and is elastically deformed. Since the deformation of the elastic part corresponds to the height and plate thickness of the burring of the panel, even if the height of the burring is high, the resistance when pushing is reduced by the deformation of the elastic part without increasing the pushing force. The grommet can be attached to the panel smoothly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the grommet according to the present invention will be described below with reference to FIGS. 1 is a cutaway perspective view of a main part showing the structure of the grommet body, FIG. 2 is a side view showing the appearance of the grommet, FIG. 3 is a sectional view showing the internal structure of the grommet, and FIGS. FIG. 3 is an enlarged cross-sectional view of a main part showing. Since the lock member and the panel may have the same structure as the conventional example, the same reference numerals are given and the description thereof is omitted.

The grommet 11 in this embodiment is shown in FIG.
Also, as shown in FIG. 3, the grommet body 12 is made of a soft material such as rubber and the hard lock member 3 is integrally molded of synthetic resin. Grommet body 1
Reference numeral 2 denotes a disc-shaped base 13 and a wire insertion portion 14 formed in a cylindrical shape in the center of the base 13 as shown in FIGS. 1 to 3.
A bellows-shaped holding portion 15 that holds the wire insertion portion 14 in a flexible and deformable manner; a flange portion 16 formed by folding back the base portion 13 on the outer peripheral portion of the base portion 13; and an upper surface of the flange portion 16. A lip-shaped elastic portion 17,
It has two tongue portions 18 formed on the lower surface of the flange portion 16.

The lower side of the base portion 13 and the flange portion 16
An annular recessed portion 19 is formed by and the annular portion 5 of the lock member 3 is fitted into this recessed portion 19, and the grommet body 12 and the lock member 3 are integrally combined as shown in FIGS. 2 and 3. 11 is configured. The lock 7
As can be understood from FIGS. 2 and 3, the cylindrical body 21 is formed by cutting out, and in this embodiment, it is formed at 120 ° intervals. Grommet body 12 and lock member 3
In the state of combining with, that is, in the grommet 11, the elastic portion 17 formed on the upper surface of the flange portion 16
Contact with the lower side surface of the annular portion 5, but the elastic portion 17 projects in a lip shape, so that they are in line contact with each other.

Next, the operation of mounting the grommet 11 will be described. To mount the grommet 11, the bottom portion of the cylinder body 21, that is, the bottom portion 7a of the lock portion 7 is inserted into the through hole 6a of the panel 6, and then urged downward as shown by an arrow X in FIGS. 4 and 5. As a result, the lock portion 7 is deformed in the central direction corresponding to the inclination of the outer sloped portion 7b, and when the burring 6b is fitted into the cutout portion 7c, it is returned to the outer side by the elasticity of itself and then moved from the panel 6. It is installed so that it cannot be pulled out. While the mounting operation is performed, the tongue portion 18 is initially in the original shape as shown by an imaginary line in FIG. 4, but the degree of pushing of the grommet 11 makes contact with the surface of the panel 6 and then pushes it completely. When the burring 6b is mounted, that is, when it is mounted, the burring 6b is deformed in accordance with the height of the burring 6b.

As shown in FIG. 4, when the height of the burring 6b is A, the amount of deformation of the tongue portion 18 is small. However, especially the outer tongue 18 of the tongues 18 has a fin-shaped contact surface with the panel 6, and moreover, the two tongues 18 elastically contact the panel 6 to seal the panel 6. The sex is fully retained. Further, as shown in FIG. 4, when the height of the burring 6b is A, a force that strongly pushes up the flange portion 16 does not act, so that the elastic portion 17 is hardly crushed and deformed and has a shape almost as assembled. ing.

On the other hand, as shown in FIG. 5, when the height of the burring 6b is higher than A mentioned above, the tongue portion 18 is largely deformed and the entire flange portion 16 is pushed upward by the panel 6. Therefore, the lip-shaped elastic portion 17 is pressed against the annular portion 5 and is easily deformed. At this time, the deformation of the elastic portion 17 is caused by the through hole 6 of the grommet 11.
Since it corresponds to the amount of pushing into a, the tongue portion 18 and the flange portion 16 do not become compressed and become difficult to push in unlike the conventional example, and they are smoothly attached with less force than in the past. can do. Further, the elastic portion 17 maintains the adhesiveness between the flange portion 16 and the annular portion 5.
As a result, the workability in mounting the grommet 11 is significantly improved as compared with the conventional grommet 1, and the grommet 1 is integrally mounted in a good state on the panel 6.

That is, by forming the elastic portion 17 on one side surface of the flange portion 16, the workability when mounting the grommet 11 can be improved. Further, the elastic portion 17 may be formed over the entire circumference of the flange portion 16, or may be partially formed in accordance with the formation interval of the lock portion 7 as in the above embodiment. Furthermore, the elastic portion 17 is not limited to the lip shape, and may have an uneven shape or the like.

[0014]

As described above, the grommet according to the present invention is assembled by fitting the annular portion of the hard lock member into the annular concave portion formed on the outer periphery of the soft grommet body and assembling the annular portion. An elastic portion that elastically contacts and deforms the annular portion is formed on one side surface of the flange portion that forms the concave portion, and a tongue portion that seals by contacting the side surface of the panel is formed on the other side surface. Insert one end of the lock member into the through hole formed in the panel and push it in to elastically deform the lock part by pushing it in, then at the time of inserting it to the prescribed position, return the lock part to its original shape and mount it It is configured in. When the grommet is attached, the tongue and the flange are biased toward the annular part according to the amount of pushing, but the elastic part is formed at least at the position corresponding to the lock part on the surface of the flange part that contacts the annular part. Therefore, the elastic portion is pressed against the annular portion by the bias and is elastically deformed. Since the deformation of the elastic part corresponds to the height and plate thickness of the burring of the panel, even when the burring is high, the resistance at the time of pushing is reduced by the deformation of the elastic part, without increasing the pushing force. The grommet can be mounted on the panel smoothly.
Therefore, it is possible to improve the efficiency of the mounting work when mounting the grommet.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a configuration of a grommet body which is an embodiment of the present invention.

FIG. 2 is a side view showing a configuration of a grommet.

FIG. 3 is a cross-sectional view showing the structure of a grommet.

FIG. 4 is an enlarged cross-sectional view of a main part for explaining a mounting action of a grommet.

FIG. 5 is an enlarged cross-sectional view of a main part for explaining another mounting operation of the grommet.

FIG. 6 is an enlarged cross-sectional view of a main part for explaining a mounting action of a conventional grommet.

FIG. 7 is an enlarged cross-sectional view of a main part for explaining another mounting operation of the conventional grommet.

[Explanation of symbols]

 3 Lock member 6 Panel 6a Through hole 6b Burring 7 Lock part 7a Bottom part 7b Outer slope part 7c Locking part 11 Grommet 12 Grommet body 13 Base part 14 Wire insertion part 15 Holding part 16 Flange part 17 Elastic part 18 Tongue part 19 Annular recess 21 Cylinder A, C Burling height X Pushing direction

Claims (3)

[Claims] 1. A flexible grommet main body having an annular recess formed on the outer periphery thereof and an annular portion provided on a hard lock member fitted therein to be integrally assembled, and having elasticity provided on the hard lock member at desired intervals. In a grommet which is mounted by inserting the lock portion into a through hole provided in the panel, an elastic member which is on one side surface of the flange portion forming the annular recess and contacts the annular portion at least at a position corresponding to the lock portion. A grommet characterized in that a tongue portion is formed on the other side surface while forming a portion. 2. The grommet according to claim 1, wherein the elastic portion is provided over the entire circumference of the annular recess. 3. The elastic portion has a lip shape protruding from the flange portion.
Grommet described.