JPH084730A - Screw grommet - Google Patents

Abstract

PURPOSE:To make common use of a screw grommet to two kinds of installing plates different in a plate thickness by dividing a seat part of the screw grommet and base end parts of a pair of leg parts into two parts in the longitudinal direction so as to mutually form a symmetric cross sectional square shape, and constituting a longitudinal width of an engaging groove so as to be switched by the reversal. CONSTITUTION:A screw grommet 19 has a pair of leg parts 13 and 23 on the reverse side of a seat part 10A, and is intergally formed of synthetic resin, and the seat part 10A and a pair of base end parts 13a and 23a of the pair of leg parts 13 and 23 are divided into two parts in the longitudinal direction so as to mutually form a symmetric cross sectional square shape. An integral hinge part 17 is formed in order to make the divided seat part half bodies 10 and 20 and leg parts 13 and 23 reversible in the separating direction. For example, U-shaped engaging grooves 12 and 22 having a narrow width to a plate thickness of a front part 1a of a door inner panel and U-shaped engaging grooves 12a and 22a having a wide width to a plate thickness of a side surface part, are formed on both side surfaces of the pair of base end parts 13a and 23a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a mounting plate having a screw through hole set therein and an engaging groove for engaging a mounting hole of another mounting plate on the back side of a seat portion having a screw groove formed therein. The present invention relates to a screw grommet in which a pair of legs are integrally formed.

[0002]

2. Description of the Related Art As shown in FIG. 5, when a door trim is attached to a door inner panel 1 of an automobile door, a pair of leg portions 7 are provided in its mounting holes 2 and 3 by a screw grommet 9 as shown in FIG. Is set and engaged with the engagement groove 6, the door trim is set on the seat portion 8, and the screw is screwed into the screw groove 5 through the screw through hole.

[0003]

However, the plate thickness of the side surface portion 1b is usually thicker than the front surface portion 1a of the door inner panel 1 in terms of strength, and the vertical width of the engaging groove 6 of the screw grommet 9 is made larger. It was necessary to prepare two types of screw grommets corresponding to each plate thickness. Further, when a speaker is attached to the speaker mounting hole 4 of the door inner panel 1, another screw grommet may be needed because the screw diameter used is different.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and an object thereof is to provide a screw grommet which can be used in two types.

[0005]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention has a pair of legs integrally formed on the back side of a seat, and between the base end of these legs and the back surface of the seat. By forming the engaging groove, the engaging hole of one mounting plate is engaged with the engaging groove, the other mounting plate is set in the seat portion, and the screw of the seat portion and the base end portion is passed through the screw through hole. In the screw grommet for screwing the screw into the groove to attach both mounting plates, the seat part and the base end part of the pair of legs, which are formed in a rectangular cross section, are formed into a symmetrical cross section. The seat is divided into two parts in the longitudinal direction so that the divided seat half and the pair of legs can be inverted in the separating direction, and the lower ends of the pair of legs are formed as integral hinge parts. On each side of the half, pair it with the side of the mating seat half. Sometimes mutually engageable shapes complementary engaging portions were formed, respectively, on both sides of each base end portion to form respective engaging groove to also formed during reverse the engaging groove,
Screw groove halves are formed on both sides of each seat half and each base end so that the screw grooves are formed even when inverted, and the vertical width of the engaging grooves on both sides is 2 It is characterized in that the dimensions are set to be different from each other according to the plate thickness of each type.

[0006]

When the plate thickness of one of the mounting plates engaged with the engaging groove changes, the engaging portions of each seat half are separated and inverted in the direction of separation so that they are not engaged with each other. When the engaging portions are engaged, the screw groove halves occupying the outer positions face each other to form screw grooves, and the engaging grooves having different vertical widths facing each other move to the outer position. The mounting holes of the mounting plates having different thicknesses can be engaged with each other.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screw grommet according to an embodiment of the present invention will be described with reference to FIGS. In FIG. 1, the screw grommet 19 is integrally formed of a synthetic resin so as to include a pair of legs 13 and 23 on the back side of the seat 10A having a rectangular cross section. The pair of base portions 13a, 23a of the seat 10A having the rectangular cross section and the pair of legs 13, 23 having the rectangular cross section in the longitudinal direction are arranged in the longitudinal direction so as to form a symmetrical cross section of the cross section. The seat halves 10 and 20 and the leg portions 13 and 23, which are divided into two parts and are mutually divided, can be integrated at the lower end portions of the leg parts 13 and 23 so as to be able to be inverted in the direction away from each other. The hinge portion 17 is formed.

On both side surfaces of the seat halves 10 and 20, engaging portions 11, 21 and 21a, 11a of semi-circular concave and convex portions having complementary shapes which can be engaged with each other when facing each other are formed. There is.

On both side surfaces of the pair of base end portions 13a, 23a, for example, a U-shaped engaging groove 12, 22 having a vertical width of 0.7 mm and a side surface corresponding to the plate thickness of the front portion 1a of the door inner panel 1. U-shaped engaging grooves 12a and 22a having a vertical width of 1.2 mm are formed corresponding to the plate thickness of the portion 1b.

The seat halves 10, 20 and the base end 13a,
On both side surfaces of 23a, half-cylindrical screw groove halves 14, 24 and 1 are formed so that screw grooves are formed even when inverted.
4a and 24a are formed. These screw groove halves have the same diameter and are premised on the screwing of screws of the same type. In addition, the screw groove portions of the base end portions 13a and 23a are provided at the base end portions 13a and 23a when screwing the screw.
Is slightly opened to ensure engagement of the door inner panel 1. The screw grommet 19 thus configured is molded by the upper mold and the lower mold in the state shown in FIG.

A method of using the screw grommet 19 for attaching the door trim 1c to the door inner panel 1 shown in FIG. 5 will be described. Mounting hole 2 on the front part 1a
When the door trim 1c is attached to, the engaging portions 11 and 21 of the seat half bodies 10 and 20 are engaged, as shown in FIG. 1A.

Insert the legs 13 and 23 into the mounting hole 2,
The engagement grooves 12, 22 are slightly bent by their elasticity to engage the peripheral surface of the mounting hole 2. Put the door trim 1c into the seat half 1
Set to 0, 20 and screw the screw 5b into the screw groove formed by the screw groove halves 14 and 24 through the screw through hole 5a.
23a are slightly separated from each other, the front portion 1a is securely engaged, and the door trim 1c is screwed (see FIG. 3A).

The door trim 1 is installed in the mounting hole 3 of the side surface portion 1b.
When mounting c, as shown in FIG. 1B, the engaging portions 11a and 21a of the seat half bodies 10 and 20 are engaged by reversing the screw grommet 19. Engagement grooves 12a, 2
The peripheral surface of the mounting hole 3 is engaged with 2a. Seat half 1
The door trim 1c is set to 0 and 20, and the screw 5b is passed through the screw through hole 5a and the screw groove half body 14
a, 24a (Fig. 3B)
reference).

FIG. 4 shows another embodiment. In the screw grommet shown in FIG. 1B, the screw groove halves 14b and 24b located outside are the diameters of the screw groove halves 14a and 24a facing each other. Is set smaller than. Therefore, it is possible to switch to the screw grommet in which the vertical width of the engaging groove and the diameter of the screw groove are different. In addition, as shown by the dotted line in the figure, in order to increase the amount of bending of the base end portions 13a and 23a when setting the mounting holes of the mounting plate, the width of the base end portions 13a and 23a is set so as not to contact each other. It is also conceivable to make the gap S narrower to form the gap S. Further, in the figure, only the screw groove is changed over to engage the engaging groove 1
The vertical widths of 2a, 22a and 12, 22 may be the same.

[0015]

According to the first aspect of the invention, the vertical width of the engaging groove can be switched by reversing one screw grommet, and the screw grommet is commonly used for two types of mounting plates having different plate thicknesses. Can be converted. According to the invention of claim 2,
Even when the plate thickness of the mounting plate that engages with the engagement groove and the screw diameter to be used are different, the two types can be used. According to the invention of claim 3, even when the screw diameter to be screwed into the screw grommet is different, the screw grommet can be properly used in two types.

[Brief description of drawings]

1 shows a screw grommet according to an embodiment of the present invention, FIG. 1A is a perspective view showing one usage state, and FIG. 1B is a perspective view showing a reversed usage state.

FIG. 2 is a perspective view showing a state in which the screw grommet is molded.

3 is a cross-sectional view showing a usage state of the screw grommet, FIG. 3A shows a usage state in the state of FIG. 1A, and FIG. 3B shows a usage state in FIG. 1B.

FIG. 4 is a perspective view of a screw grommet according to another embodiment.

FIG. 5 is a perspective view of an automobile door in which the screw grommet is used.

FIG. 6 is a perspective view of a conventional screw grommet.

[Explanation of symbols]

 2, 3 Mounting hole 10, 20 Seat half 11, 11, a, 21, 21a Engagement part 12, 12a, 22, 22a Engagement groove 13, 23 Leg part 13a, 23a Leg end base part 14, 14a, 24, 24a Screw groove half body 17 Integral hinge part

Claims (3)

[Claims] 1. A pair of leg portions are integrally formed on the back side of the seat portion, and an engaging groove is formed between the base end portion of these leg portions and the back surface of the seat portion, whereby one of the engaging grooves is formed. To attach both mounting plates by engaging the mounting holes of the mounting plate, setting the other mounting plate in the seat, and screwing the screw into the screw groove of the seat and the base end through the screw through hole. In the screw grommet of, the seat portion formed in a rectangular cross section and the base end portions of the pair of legs are vertically arranged so as to form a symmetrical square cross section.
Along with dividing, the lower half of the pair of legs is formed as an integral hinge so that the divided half of the seat and the pair of legs can be inverted in the separating direction, and both side surfaces of each half of the seat are divided. To form engaging portions having complementary shapes that can engage with each other when facing the side surface of the seat half half of the other side, and engaging grooves on both side surfaces of each of the base end portions when the inversion is performed. The engaging grooves are respectively formed so as to also form, and the screw groove half bodies are formed on both side surfaces of the seat portion half bodies and the base end portions so that the screw grooves are formed even when the inversion is performed, The vertical width of the engaging groove on the both side surfaces is equal to that of one mounting plate.
Screw grommets characterized in that they are set to different dimensions according to the plate thickness of each type. 2. The screw grommet according to claim 1, wherein the diameters of the screw groove halves on both sides are different from each other in correspondence with two kinds of screw diameters. 3. The vertical widths of the engaging grooves on both side surfaces are set to have mutually the same dimensions instead of being set to different dimensions corresponding to the two kinds of plate thicknesses of one mounting plate. The screw grommet according to claim 1, wherein the diameters of the screw groove halves on both side surfaces are set to different sizes corresponding to two types of screw diameters.