JP3373002B2 - Grommet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents contact between an opening and a wire harness when inserting a wire harness or the like into an opening formed in a panel, and prevents infiltration of water into the panel. More specifically, the present invention relates to a grommet structure for easily attaching to and detaching from an opening.

[0002]

2. Description of the Related Art Heretofore, this type of grommet has generally been formed integrally with a rubber material. However, the rubber material integrally molded grommet has a problem that the rubber material deteriorates when it is used for a long period of time and is dropped from the panel, and the frictional resistance at the time of fitting is large, resulting in poor workability. . In order to solve such a problem, for example, in the one disclosed in Japanese Utility Model Laid-Open No. 64-31621, a grommet is divided into two parts, and one part fitted into an opening of a panel is made of a hard synthetic resin. It has been proposed that the other part, which is made of a material and serves as the cover part, be made of a rubber material.

A grommet consisting of these two parts will be described below with reference to FIG. Panel 1 has a circular opening 3
And an inner grommet 5 made of a hard synthetic resin material is fitted in the opening 3. An outer grommet 7 is attached to the inner grommet 5 fitted in the opening 3 so as to cover the inner grommet 5. The basic shape of the inner grommet 5 is a tubular body, and an annular flange 11 is formed at the open end of the inner tubular portion 9. A circular insertion hole 19 for inserting the wire harness 17 is formed in the base portion 15 that integrally connects the inner tubular portion 9 and the locking piece portion 13. The outer peripheral surface of the locking piece portion 13 is formed into a tapered surface 13a, and a stepped locking portion 21 that locks with the opening 3 of the panel 1 is formed outside the open end.

On the other hand, the outer grommet 7 is formed in a funnel shape, so to speak, and is made of a rubber material or the like, and has a base portion 23 and an outer edge portion 2.
5, a fitting recess 27 for fitting the flange 11 is formed, and the panel 1 is provided at the open end of the outer edge 25.
Is formed with a waterproof lip 29 that is in close contact with the surface of the.
Further, a pipe-shaped insertion portion 31 is formed at the center of the base portion 23 so that the wire harness 17 can be inserted and held.

When fixing the inner grommet 5 to the opening 3 of the panel 1 in the two-part grommet constructed as described above, first, the fitting recess 27 of the outer grommet 7 is expanded to fit the flange 11.
Inner grommet 5 and outer grommet 7 are integrated. Then, with the wire harness 17 inserted through the insertion hole 19 and the insertion portion 31, the tapered surface 13a of the inner grommet 5 is aligned with the opening 3, and in the illustrated case, the inner grommet 5 is pushed downward. As a result, the locking piece portion 13 follows the tapered surface 13a and is elastically deformed by being biased inward, that is, in the central axis direction of the cylindrical body, and the inner grommet 5 is embedded in the opening portion 3.

In this state, when the tip of the locking piece 13 of the inner grommet 5 is further pushed to a position corresponding to the edge of the opening 3, the force that biases the locking piece 13 inward is released. The locking piece portion 13 returns to the outside and the locking portion 21 locks in the opening 3. As a result, the wire harness 1
The inner grommet 5 and the outer grommet 7 that have been inserted through 7 sandwich the panel 1, and the attachment of the two-component grommet to the panel 1 is completed. According to the above-mentioned two-component grommet, the wire harness 17 is completely insulated from the panel 1, there is no possibility of an electric leakage accident due to rubbing, and the infiltration of water transmitted on the panel surface prevents the waterproof lip 29. Will be reliably prevented by.

[0007]

However, in the conventional two-part grommet, the inner grommet 5 made of a hard synthetic resin material is provided with the locking piece portion 13 to prevent the falling off and improve the workability of mounting. Therefore, when removing the inner grommet 5 once attached, it is necessary to release the engagement of the locking piece portion 13, and the locking piece portion 13 must be deformed inward (in the direction of the central axis of the cylinder). There wasn't. However, it is actually extremely difficult to deform the locking piece portion 13 located on the back side of the panel 1 inwardly. When the inner grommet 5 is to be removed, the inner grommet 9 is removed after the outer grommet 7 is removed. In a difficult working state from the side, the locking piece portion 13 had to be deformed and removed. This work is extremely troublesome, requires a large number of man-hours, and is inconvenient when an emergency is required. Further, when the inner grommet 5 is destroyed, a new inner grommet 5 must be prepared, which becomes very inconvenient when the inner grommet 5 cannot be prepared on the go.

The present invention has been made in view of the above circumstances, and provides a grommet which can be easily removed even after it is once attached, in addition to preventing falling and ensuring workability of attachment. The purpose is to reduce the number of man-hours required for damage and removal.

[0009]

The structure of the grommet according to the present invention for achieving the above object is "a hole is formed in the center.
A disk-shaped base formed and the base located in the center of the hole
Tube for inserting the electric wire formed in the
It extends from the outer edge of the base to the panel side.
An opening for mounting the grommet of the panel
A cylindrical part with an inner diameter larger than the diameter of
A soft outer grommet having an annular recess formed, and a plurality of uprights fitted into the opening of the panel,
A locking piece that elastically locks in the opening, and the annular recess
The flange that fits in the center part and the central part
In a two-part grommet consisting of an inner grommet having a disc-shaped bottom wall with holes formed therein, a protrusion protruding toward the center of the opening is provided at the edge of the opening, and the protrusion is A groove that enters and deforms the locking piece inward by cooperating with the protrusion to release the locking between the opening and the locking piece is diagonally crossed over the outer peripheral surface of the locking piece. It is characterized by being formed by.

Further, the structure of the grommet according to the present invention for attaining the above-mentioned object is as follows: "A disk-shaped base portion having a hole formed in the central portion, and a base portion formed at the center of the hole. A tube for inserting an electric wire, and a cylindrical portion having an inner diameter larger than the diameter of the opening for mounting the grommet of the panel, which is formed so as to extend from the panel-side edge of the outer periphery of the base portion to the panel side, A soft outer grommet having an annular recess formed inside the cylindrical portion, a plurality of uprights fitted in the opening of the panel, a locking arm elastically locked in the opening, and In a two-part grommet consisting of an inner grommet having a flange that fits in an annular recess and a disc-shaped bottom wall that is formed in the vertical column and has a hole formed in the center, a direction that is orthogonal to the panel surface. of A portion is formed at the edge of the opening, and a diagonally crossing slit is formed in the collar, and a locking hole is formed at the end of the slit on the tip side of the flange, and the locking arm is A protrusion that is provided between the vertical columns and that fits into the slit and that locks in the locking hole is provided on the outer peripheral surface of the locking arm. " Furthermore, the structure of the grommet according to the present invention for achieving the above-mentioned object is to "insert a disk-shaped base portion having a hole formed in the center portion and an electric wire formed at the center of the hole and formed in the base portion. A tube for making, and a cylindrical portion having an inner diameter larger than the diameter of the opening for mounting the grommet of the panel, which is formed to extend from the panel-side edge of the outer periphery of the base portion to the panel side, A soft outer grommet having an annular recess formed inside, a plurality of uprights fitted in the opening of the panel, a locking arm elastically locked in the opening, and the annular recess. In a two-part grommet consisting of an inner grommet having a flange to be fitted into and a disc-shaped bottom wall formed in the vertical column and having a hole formed in the center thereof, a collar part in a direction orthogonal to the panel surface. The above It is formed on the edge of the mouth portion, projecting the projection on the collar portion on the inner peripheral surface of the flange portion, a slit which crosses obliquely on the outer peripheral surface of the locking arm, the flange side < An engaging hole is formed at the end of the slit.

[0011]

In the grommet having the projection and the groove, when the inner grommet is pushed into the opening, the locking piece is bent inward, and when the tip of the locking piece reaches the edge of the opening,
The elastic force returns to the original position again, the locking piece is locked to the edge of the opening, and the grommet is attached to the panel. When the attached grommet is rotated relative to the panel, the protrusion enters into the groove of the locking piece, and then the protrusion and groove are slid relative to each other, so that the locking piece is pressed by the protrusion and moves inward. It deforms and the locking piece comes off the edge of the opening,
The grommet is released from the panel by being pushed up by the reaction force from the protrusion.

Further, in a grommet having a slit and a protrusion, when the protrusion of the inner grommet is aligned with the slit of the panel collar and the inner grommet is rotated,
The protrusion receives a reaction force from the slit, the combined force pushes the inner grommet into the opening of the panel or the like, and the protrusion is locked in the locking hole, whereby the grommet is attached to the panel. When the inner grommet is rotated by the reverse rotation of the time of insertion, the protrusion receives the reaction force from the slit, the combined force pushes the inner grommet up from the inside of the opening, and the protrusion comes out of the slit.
Grommet comes off the panel.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the grommet according to the present invention will be described in detail below with reference to the drawings. 1 is a sectional view of the grommet of the present invention, FIG. 2 is a plan view of the grommet of the present invention seen from the inner grommet side, FIG. 3 is a plan view of a panel opening, FIG. 4 is a sectional view of a panel opening, and FIG. 5 is an inner grommet. FIG. 6 is a perspective view of the outer grommet, and FIG. 7 is an enlarged view showing main parts of the panel, the inner grommet, and the outer grommet. Further, FIG. 1 shows a cross section in the XX direction of FIG. As shown in FIGS. 3 and 4, a grommet mounting panel 53 is provided with a grommet mounting hole 53, which is an opening, and four grommet mounting holes 53 are formed with four protrusions 55 protruding toward the center. ing.

On the other hand, as shown in FIG. 5, a hollow disk-shaped flange 59 is formed on the inner grommet 57 made of a hard synthetic resin material, and a standing column 61 is erected on the flange 59, and the tip of the standing column 61 is formed. A hollow disk-shaped bottom wall 63 is provided in the. A circular insertion hole 65 is formed in the center of the bottom wall 63, and a wire harness 67 (see FIG. 1) is inserted into the insertion hole 65. The standing pillar 61 is
The spacers are sandwiched at four corners between the flange 59 and the bottom wall 63 like spacers, and the corners project from the outer edge of the bottom wall 63 (see FIG. 2). Then, the outer edges of the bottom wall 63 and the vertical columns 61
Four locking pieces 69 are provided at a position corresponding to the middle of. One end of the locking piece 69 is integrally connected to the bottom wall 63.

The locking piece 69 is for locking the inner grommet 57 in the grommet mounting hole 53, and has an elastically bendable shape. A notch-shaped step portion 69a is formed at a connection portion between each locking piece 69 and the flange 59, and the step portion 69a is adapted to be locked at an edge portion of the grommet mounting hole 53. A taper surface is formed on the outer peripheral surface of the locking piece 69, and a groove 71 that obliquely crosses the taper surface is formed on the taper surface. The protrusions 55 of the grommet mounting holes 53 are inserted into the grooves 71.

On the other hand, as shown in FIG. 6, a hollow disk-shaped base portion 75 is formed on the outer grommet 73 made of a rubber material or the like, and the wire harness 67 is formed on the inner peripheral edge of the base portion 75.
A tube 77, which is an insertion hole for the, is projected. Base 7
A peripheral wall 79 is bent and formed at the outer peripheral edge of 5, and the tip portion of the peripheral wall 79 is bent further inward to form an annular support portion 81. A panel lip 83 is formed at the tip of the peripheral wall 79, and the panel lip 83 prevents infiltration of water between the outer grommet 73 and the panel 51. Tube 7
A plurality of harness lips 85 (see FIG. 1) are provided on the inner peripheral surface of 7, and the wire harness 67 inserted into the tube 77 is sealed by the harness lips 85 and a tape 87 (see FIG. 1). It is designed to be waterproof by winding. An annular recess 89 is formed inside the outer grommet 73 by the base portion 75, the peripheral wall 79, and the support portion 81, and the annular recess 89 is fitted to the flange 59 of the inner grommet 57. The protrusion 55, the inner grommet 57, the locking piece 69, the groove 71,
The grommet 91 according to the present embodiment is configured with the outer grommet 73 as a main member or site.

Next, the grommet 9 thus constructed
Assembly of No. 1 and attachment to the panel 51 will be described. To attach the grommet 91 to the panel 51, first, the peripheral wall 79 of the outer grommet 73 is expanded in diameter, and the flange 59 of the inner grommet 57 is fitted into the annular recess 89. The wire harness 67 is fixed in a state in which the bottom wall 63, the flange 59, and the tube 77 are inserted, as shown by an imaginary line (two-dot chain line) in FIG. 1. Next, the bottom wall 63 side of the inner grommet 57 is attached to the grommet mounting hole 53.
Match and push in as it is. At this time, since the locking piece 69 has a taper surface formed in the insertion direction, it is bent inward by being pushed into the grommet mounting hole 53. When the inner grommet 57 is further pushed in, the step portion 69a at the tip of each locking piece 69 reaches the edge portion of the grommet mounting hole 53, and the elastic force causes the locking piece 69 to return to its original position again so that the step portion 69a is edged. Grommet 9 by locking the part
1 is attached to the panel 51 (see FIG. 1).

Next, the removal of the grommet 91 attached to the panel 51 as described above from the panel 51 will be described. Inner grommet 5 assembled
When the outer grommet 7 and the outer grommet 73 are rotated relative to the panel 51, the protrusion 55 protruding from the grommet mounting hole 53 enters the groove 71 of the locking piece 69. Protrusion 55 is groove 7
When the inner grommet 57 and the outer grommet 73 are further rotated in the state of entering 1, the projection 55 and the groove 71 are relatively slid, and the locking piece 69 is pressed by the projection 55 and deformed inward. This deformation is caused by the rotation of the inner grommet 57 due to the action of the taper surface formed on the locking piece 69 and the groove 71 formed obliquely. Locking piece 6
When 9 is deformed inward, the stepped portion 69a is disengaged from the edge of the grommet mounting hole 53, and further rotated, the inner grommet 57 receives the reaction force from the protrusion 55 and is relatively moved, that is, pushed up ( (Upward in FIG. 1), the panel 51 will be removed. That is, the inner grommet 57 is easily released from the locked state by the interaction between the protrusion 55 and the groove 71.

According to the above-mentioned grommet 91, the grommet 91 can be easily attached to the panel 51 by pushing it into the grommet attachment hole 53, and the engagement piece 69 is engaged with the edge of the grommet attachment hole 53 after the attachment. The removal can be reliably prevented, and the inner grommet 57 and the outer grommet 73 are relatively rotated at the time of removal so that they can be easily removed from the panel 51 by the engagement release and push-up action of the locking pieces 69. In addition,
Since the groove 71 receives a reaction force from the projection 55, a rotational force at the time of removal is added to a degree that does not hinder the work. For example, the panel 51 or the wire harness 67.
Due to such vibrations, the inner grommet 57 is prevented from rotating naturally, and the inner grommet 57 is prevented from coming off the panel 51. Further, in the above-described embodiment, the case where the number of the protrusions 55 and the number of the locking pieces 69 are four has been described as an example, but the number thereof is not limited to this.

Next, another embodiment of the grommet of the present invention will be described with reference to FIGS. 8 is a sectional view of a grommet according to another embodiment, FIG. 9 is a plan view of a grommet according to another embodiment as viewed from the inner grommet side, and FIG. 10 is a plan view of a panel opening portion according to another embodiment. 11 is a sectional view of a panel opening according to another embodiment, FIG. 12 is a perspective view of an inner grommet according to another embodiment, and FIG. 13 is a main part of a panel, an inner grommet, and an outer grommet according to another embodiment. FIG. Further, FIG. 8 shows a cross section in the YY direction of FIG. 1 to 7
The same members as the members shown in FIG. As shown in FIGS. 10 and 11, the panel 51 is provided with a grommet mounting hole 101, and the grommet mounting hole 101 is formed by a burring process.
The collar 103 is in a state of being erected on one surface side. A slit 105 is obliquely formed in the collar portion 103 extending from the base end to the tip portion, and the slit 105 is a long hole whose inner circumference is closed. A part of the slit 105 on the base end side of the collar portion also covers the panel 51, and a hole 105a (see FIG. 13) is also formed in the plane of the panel 51, the part of which is open. A locking hole 107 is formed at one end of the slit 105 on the tip side of the flange 103, and the locking hole 107 has a diameter larger than the width of the slit 105.

On the other hand, as shown in FIGS. 9 and 12, a locking arm 111 is formed between four standing columns 61 that integrally connect the flange 59 of the inner grommet 109 and the bottom wall 63, and the locking arm 111 is formed. Has a central portion that bulges outward. The virtual circle circumscribing the bulge of the locking arm 111 is
The diameter is slightly smaller than the inner diameter of the grommet mounting hole 101. That is, the inner grommet 109 is inserted into the grommet mounting hole 101 in a state where the bulging portion of the locking arm 111 is close to the inner circumference of the flange 103. A protrusion 113 is formed on the bulging portion of the locking arm 111, and the protrusion 113 is adapted to be inserted into the slit 105 of the flange 103. Further, the projection 113 inserted into the slit 105 is adapted to be locked to the flange 103 at the position of the locking hole 107. Collar 103, slit 1
05, locking hole 107, inner grommet 109, locking arm 111, protrusion 113, and outer grommet 73 as main members and parts, and grommet 1 according to another embodiment.
15 are configured.

To assemble the grommet 115 thus constructed and attach it to the panel 51, first, the peripheral wall 79 of the outer grommet 73 is expanded, and the flange 59 of the inner grommet 109 is fitted into the annular recess 89. Next, for attachment to the panel 51, the protrusion 113 of the inner grommet 109 is aligned with the hole 105a of the panel 51 (see FIG. 13), and the inner grommet 109 is rotated. When the inner grommet 109 is rotated, the protrusion 113 receives a reaction force from the slit 105, and the combined force pushes the bottom wall 63 side of the inner grommet 109 into the grommet mounting hole 101 via the protrusion 113. When the inner grommet 109 is further rotated, the protrusion 113 is locked in the locking hole 107 of the slit 105,
The attachment of the grommet 115 to the panel 51 is completed (see FIG. 8).

The grommet 115 is attached to the grommet mounting hole 10
When removing from 1, the inner grommet 109 is rotated in the reverse rotation of the time of insertion. When the inner grommet 109 is rotated, the protrusion 113 receives a reaction force from the slit 105, and the combined force allows the inner grommet 109 to be pushed up from within the grommet mounting hole 101, so that the protrusion 113 is part of the panel 51. Hole 10 open to
The inner grommet 109 comes off from the panel 51 by coming off from 5a.

Grommet 115 according to another embodiment described above.
According to this, by inserting the protrusion 113 into the slit 105 and rotating the inner grommet 109 with respect to the panel 51, the inner grommet 1 can be moved along the slit 105.
09 can be easily attached, and after the attachment, the projection 113 is locked in the locking hole 107 to prevent it from coming off with certainty. Moreover, when removing the inner grommet 115, the inner grommet 115 is rotated in the opposite direction to the mounting direction. By doing so, the inner grommet 109 is pushed up from within the grommet mounting hole 101 and can be easily removed from the panel 51.

In the grommet 115 according to the other embodiment described above, the slit 105 is provided in the grommet mounting hole 101.
Formed on the collar portion 103 of the
However, on the contrary, the slit 105 is formed in the locking arm 111 of the inner grommet 109, and the projection 1
Even if 13 is provided on the flange 103, the inner grommet 109 is attached by the same operation as described above.
Also, it is possible to configure one that can be easily removed. Further, in the above-mentioned other embodiments, the locking arms 111,
Although the case where the number of the protrusions 113 is four has been described as an example, the number thereof is not limited to this.

[0026]

As described in detail above, according to the grommet having the projection and the groove according to the present invention, when the grommet is relatively rotated with respect to the panel, the projection enters into the groove of the locking piece and the engagement is performed. Since the stopper is pushed by the protrusion and disengaged from the edge of the opening and is pushed up by the reaction force from the protrusion, the grommet can be detached from the panel very easily. In addition, even with a grommet having a slit and a protrusion, if the inner grommet is rotated in the reverse rotation of the time of insertion, the protrusion receives the reaction force from the slit, the inner grommet is pushed up from within the opening, and the grommet is removed from the panel. It can be removed very easily. As a result, it is possible to remarkably reduce the breakage of the grommet and the great number of steps required for removal.

[Brief description of drawings]

FIG. 1 is a sectional view of a grommet according to an embodiment of the present invention.

FIG. 2 is a plan view of the grommet according to the embodiment of the present invention as viewed from the inner grommet side.

FIG. 3 is a plan view showing a shape of an opening of a panel applied to one embodiment of the present invention.

4 is a cross-sectional view of the panel opening of FIG.

FIG. 5 is a perspective view of an inner grommet according to an embodiment of the present invention.

FIG. 6 is a perspective view of an outer grommet according to an embodiment of the present invention.

FIG. 7 is an enlarged view showing main parts of a panel, an inner grommet and an outer grommet applied to one embodiment of the present invention.

FIG. 8 is a sectional view of a grommet according to another embodiment of the present invention.

FIG. 9 is a plan view of an inner grommet of a grommet according to another embodiment of the present invention.

FIG. 10 is a plan view of a panel opening according to another embodiment.

FIG. 11 is a cross-sectional view of a panel opening according to another embodiment.

FIG. 12 is a perspective view of an inner grommet according to another embodiment.

FIG. 13 is an enlarged view showing main parts of a panel, an inner grommet and an outer grommet according to another embodiment.

FIG. 14 is a sectional view of a conventional two-part grommet.

[Explanation of symbols]

51 panels 53 Grommet mounting hole (opening) 55 Protrusion 57 Inner grommet 59 flange 61 vertical pillar 69 locking piece 71 groove 73 Outer grommet 75 base 79 Perimeter wall 81 Support 89 annular recess 91,115 Grommet 103 collar part 105 slits 107 locking hole 111 locking arm 113 Projection

Claims (3)

(57) [Claims] 1. A disk-shaped base portion having a hole formed in a central portion thereof.
And the electric wire formed in the base located in the center of the hole
A tube for insertion and a panel on the outer periphery of the base
Is formed so as to extend from the side edge to the panel side.
With an inner diameter larger than the diameter of the opening for mounting the flannel grommet
Cylindrical part and annular recess formed inside the cylindrical part
A soft outer grommet having , a plurality of uprights fitted into the opening of the panel, and the opening
The locking piece that elastically locks to the part and the ring-shaped recess
With a flange to form a hole in the center of the vertical column
In a two-part grommet consisting of an inner grommet having a disc-shaped bottom wall, and a protrusion protruding toward the center of the opening at the edge of the opening, the protrusion is inserted and A groove is formed diagonally across the outer peripheral surface of the locking piece so that the locking piece is deformed inwardly in cooperation with the projection to release the locking between the opening and the locking piece. Grommet characterized by that. 2. A disk-shaped base having a hole formed in the center thereof.
And the electric wire formed in the base located in the center of the hole
A tube for insertion and a panel on the outer periphery of the base
Is formed so as to extend from the side edge to the panel side.
With an inner diameter larger than the diameter of the opening for mounting the flannel grommet
Cylindrical part and annular recess formed inside the cylindrical part
A soft outer grommet having , a plurality of uprights fitted into the opening of the panel, and the opening
Locking arm that elastically locks to the
A flange to be fitted and a hole formed in the vertical column at the center
In a two-part grommet consisting of an inner grommet having a disk-shaped bottom wall formed, a collar part in a direction orthogonal to the panel surface is formed at an edge of the opening, and a slit crossing diagonally. to <br/> together with forming the the collar portion, a locking hole on the end of the slit of the flange tip side
A grommet formed, a locking arm provided between the adjacent the standing column, characterized in that the projections for engaging with the locking hole and projecting from the outer peripheral surface of the locking arm with fitted in the slit. 3. A disk-shaped base portion having a hole formed in a center portion thereof, a tube located at the center of the hole for inserting an electric wire formed in the base portion, and an outer periphery of the base portion on a panel side. A soft part having a cylindrical portion formed to extend from the edge toward the panel side and having an inner diameter larger than the diameter of the grommet mounting opening of the panel, and an annular recess formed inside the cylindrical portion. An outer grommet, a plurality of vertical columns fitted in the opening of the panel, a locking arm elastically locked in the opening, a flange fitted in the annular recess, and a central portion formed in the vertical column. In a two-part grommet consisting of an inner grommet having a disc-shaped bottom wall having a hole formed therein, a collar portion in a direction orthogonal to the panel surface is formed at an edge portion of the opening, and the collar portion is formed. The protrusion on the inner surface of the collar Projecting,
Grommet, wherein the locking slit is formed to cross obliquely on the outer peripheral surface of the arm, to form a locking hole in the end portion of the slit serving as the flange side, it.