JP2002213418A - Screw grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw grommet capable of surely precluding generation of inconveniences which originate from twisting of a split leg part, without degrading the working easiness for fitting by pressure each leg part into a circular hole. SOLUTION: The screw grommet is configured, so that the leg part 2 having a screw fitting hole 6 is formed rigidly on the undersurface of a flange 1, and the leg part is provided with a plurality of slits 5 so that the leg part 2 is split into three or more segments 3, wherein one edge part of the forefront of each segment 3 confronting the slit 5 is furnished protrusively with screw engaging projections 7 which protrude toward the adjoining segment 3 located near the screw fitting hole 6, and when a segment 3 is twisted by the rotational torque of a screw s, the screw engaging projections 7 are engaged with the peripheral surface of the screw s.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw grommet suitably used for connecting and fixing various exterior parts and interior parts to an automobile body.

[0002]

2. Description of the Related Art When attaching a side spoiler or mudguard to an automobile body, a resin screw grommet is attached to a circular hole provided on the body side, and the side spoiler or mudguard is screwed to the screw grommet. Is being done.

Conventionally, such screw grommets include, for example, those shown in FIGS. That is, this screw grommet is formed by integrally projecting a circular leg 2 on the lower surface of the flange portion 1 and dividing the leg 2 into four divided legs 3 by a cross-shaped slit 5. An engaging projection 4 formed in a step shape is provided on the outer peripheral surface of the split leg 3, and a central portion (a portion crossing a cross) of the slit 5 is a screw screw hole. Reference numerals x, y, and z in the drawings are lightening recesses for material reduction or through holes formed in the design of a molding die.

[0004] The screw grommet shown in FIG.
As shown in the figure, the leg 2 is formed into a circular hole a1 of one member a.
And the engaging projection 4 provided on the outer peripheral surface of the leg 2 is attached to the one member a by engaging with the peripheral edge of the circular hole a1.
By screwing the screw s into the screw screw hole 6 through the mounting hole b1 of the other member b, one member a
And the other member b. At this time,
The screw s acts to push out each of the divided leg portions 3 of the leg portion 3 while forming a female screw in the screw screw insertion hole 6, whereby the screw grommet becomes a circular hole a1 of one member a. To be firmly fixed.

[0005]

However, when the screw s is screwed into the screw insertion hole 6, the screw grommet is rotated by the torque of the screw s as shown in FIG. 2 divided legs 3
May be twisted. In this case, the spreading operation of the leg 2 by the screw s does not work sufficiently, and the screw grommet may rotate together with the screw s. In some cases, the circular shape of one member a The screw grommet may fall off from the hole a1. Further, when such a twist is generated, when the screw s is screwed in, the pressure contact force between each split leg 3 and the outer peripheral surface of the screw s becomes weak, so that a good female screw is not formed in each split leg 3 and the screw s becomes In this case, the end point of the fastening work cannot be determined, which reduces the workability. In addition, it is difficult to securely connect and fix one member a and another member b. become.

Here, in order to prevent twisting of each of the split legs 3, it is conceivable to increase the rigidity of each of the split legs 3, but in this case, the leg 2 of the screw grommet is connected to one member. The workability at the time of press-fitting into the circular hole a is extremely reduced.

The present invention has been made in view of the above circumstances, and does not reduce the workability when inserting the screw grommet to the target member by inserting the leg into the circular hole.
An object of the present invention is to provide a screw grommet that can reliably prevent inconvenience caused by twisting of a split leg.

[0008]

According to the present invention, there is provided a screw grommet for connecting and fixing one member and another member to each other by using a screw. Along with projecting a circular leg having a screw screw hole integrally therewith, a plurality of slits penetrating from the outer peripheral surface of the leg to the screw screw hole are formed, and the leg is divided into three or more divided legs. The legs are inserted into the circular holes provided in the one member or the circular holes provided in the two superimposed members so that the legs are fastened to the one member or the two superimposed members. In a screw grommet provided with a screw screw insertion hole for screwing in a screw, a division adjacent to the one side edge facing the slit at the tip of each division leg part constituting the leg in the vicinity of the screw screw hole is provided. To the leg When each split leg is twisted by the rotation torque of the screw screwed into the screw screw hole, each screw engagement protrusion is engaged with the outer peripheral surface of the screw. Provided is a screw grommet characterized by being configured to fit together.

That is, the screw grommet of the present invention comprises:
As described above, since the screw engagement convex portion is protruded from one side edge portion facing the slit at the tip of each split leg portion in the vicinity of the screw screw hole, it is screwed into the screw screw hole. Even if each split leg is twisted by the rotating torque of the screw, this screw engaging projection engages with the outer peripheral surface of the screw and each split leg is reliably pushed outward by the screw. , Which are firmly fixed in the circular hole.

Further, even if each of the split legs is twisted, the screw engaging projection is strongly pressed against the screw outer peripheral surface,
A female screw is reliably formed on the screw engaging convex portion, and the screw can be satisfactorily tightened by securely transmitting the increase in the screwing torque to the worker without idling, and the screw can be screwed into the screw grommet. By firmly locking, one member and another member can be securely fastened.

Therefore, even if the rigidity of each split leg is set relatively low by forming a slit provided in the leg relatively deep, and the workability at the time of inserting the leg into the circular hole is improved, The two members can be securely and firmly connected and fixed without inconveniences such as co-rotation and falling off from the circular hole, and can achieve both workability and fastening performance. Further, the rigidity of the legs can be set so that each of the divided legs is positively twisted, so that the legs can be fixed more firmly without reducing the workability of press-fitting into the circular hole.

[0012]

Embodiments and examples of the present invention will be described below.
The present invention will be described more specifically. 1 and 2 show a screw grommet according to one embodiment of the present invention.
A circular leg 2 is integrally provided on the lower surface of a substantially triangular plate-shaped flange 1.

A screw screw hole 6 is formed in the center of the leg portion 2 and four slits 5 penetrating the screw screw hole 6 from the outer peripheral surface are formed in a cross shape. The legs 2 are equally divided into four divided legs 3 by the slits 5.

The outer peripheral surface of each of the split leg portions 3 is a tapered surface that is gradually inclined outward from the tip to the axial middle portion, and the upper end edge of the tapered surface is a step-shaped engaging projection. Part 4

Further, one side edge facing the slit 5 at the tip of each split leg 3 has a screw engaging convex portion located near the screw screw hole 6 toward the adjacent split leg 3. 7
Are protruded integrally. The distal end surface of the screw engagement convex portion 7 is an inclined surface that gradually protrudes from the screw screw hole 6 toward the outer peripheral surface of the leg portion 2,
The inclination angle θ (see FIG. 1 (C)) is set such that the distal end surface of each screw engagement convex portion 7 is parallel to the side surface of the adjacent leg leg 3 with a slit therebetween. I have.

Incidentally, reference numerals x, y, z in FIGS.
Is a lightening recess for reducing material or a through hole formed in the design of a molding die.

This screw grommet is shown in FIG.
As shown in the figure, the leg 2 is formed into a circular hole a1 of one member a.
And the engaging projection 4 provided on the outer peripheral surface of the leg 2 is engaged with the peripheral edge of the circular hole a1 and attached to one member a.
By screwing the screw s into the screw screw hole 6 through the mounting hole b1 of the other member b, one member a
And the other member b. At this time,
The screw s acts so as to push each split leg 3 of the leg 2 outward while forming a female screw in the screw screw insertion hole 6, whereby the screw grommet is turned into a circular hole a 1 of one member a. Firmly fixed to

Here, this screw grommet is shown in FIG. 3 (B) even when each split leg 3 is twisted by the rotation torque of the screw s when the screw s is screwed into the screw screw hole 6. As shown, the screw engaging projections 7 provided on each split leg 3 engage with the outer peripheral surface of the screw s, and each split leg 3 is reliably pushed outward by the screw s. , A circular hole a of one member a
It is firmly fixed to 1.

Even if each of the split legs 3 is twisted in this way, each of the screw engaging projections 7 strongly presses against the outer peripheral surface of the screw s, and a female screw is reliably formed on the screw engaging projection 7. Then, the screw s can be reliably transmitted to the worker without the idle rotation of the screw s, and the fastening operation can be performed satisfactorily, and the screw s is firmly locked to the screw grommet. a and the other member b can be firmly fastened.

In this embodiment, since the distal end surface of the screw engaging projection 7 is an inclined surface, when each split leg 3 is twisted, each screw engaging projection 7 smoothly moves. As it moves onto the outer peripheral surface of the screw s, each split leg 3 is gradually pushed outward along the inclined surface, and the screw s can be screwed in with good workability. Further, as shown in FIG. 3 (B), when each of the split leg portions 3 is twisted to a predetermined angle, each of the screw engaging projections 7 comes into contact with the adjacent split leg portion 3, and each of the split leg portions 3 The portion 3 is prevented from being excessively twisted and the screw engagement projection 7 is prevented from being displaced from the outer peripheral surface of the screw s, so that the above-described operation and effect of the screw engagement projection 7 can be reliably exhibited.

As described above, according to the screw grommet of this embodiment, each of the split leg portions 3 is provided with the screw engaging projection 7 so as to protrude. Since the mating projection 7 engages with the outer peripheral surface of the screw s, the slit 5 provided in the leg 2 is formed relatively deep (as shown in FIG. 5 is formed deep to the vicinity of the flange 1), the rigidity of each divided leg 3 is set relatively low, and even when the workability at the time of press-fitting the leg 2 into the circular hole a1 is improved, The two members a and b can be securely and firmly connected and fixed without inconveniences such as turning around and falling off from the circular hole a1, and both workability and fastening performance can be achieved. Further, the rigidity of the leg 2 is set so that each divided leg 3 is twisted positively, and the action of the screw engaging projection 7 can be made stronger without lowering the workability of press-fitting into the circular hole a1. It is also possible to be able to fasten.

The screw grommet of the present invention is
The configuration is not limited to the above embodiment, and the configuration can be variously changed. For example, in the above embodiment, the leg 2
Is divided into four divided legs 3, but the legs may be divided into three divided legs or five or more divided legs. Furthermore, the shape and the like of the flange portion 1 and the engagement convex portion 4 can be appropriately changed, and other configurations may be appropriately changed without departing from the gist of the present invention.

In the above embodiment, as shown in FIG. 3A, the leg 2 is inserted into the circular hole a1 formed in one member a.
Is inserted into the screw grommet, and the screw s is screwed into the screw screw hole 6 of the screw grommet through the mounting hole b1 formed in the other member b. b was connected and fixed, but the usage of the screw grommet of the present invention is not limited to this, and one member and the other member are overlapped in a state where the circular holes provided in both members are aligned,
A screw grommet may be attached to both superposed members by inserting a leg into the circular hole, and a screw may be screwed into a screw insertion hole of the screw grommet to fasten and fix both members.

Further, the screw grommet of the present invention is
It is preferably used when fixing exterior or interior components such as side spoilers or mudguards to the body of an automobile, but the application is not limited to this.
For example, when fixing building material-related parts, it is suitably used for any purpose as long as it is an application for connecting and fixing two members using a screw.

[0025]

As described above, according to the screw grommet of the present invention, the inconvenience due to the twisting of the divided leg portions can be achieved without reducing the workability when the leg portions are inserted into the circular holes and attached to the target member. Is reliably prevented, and both workability and fastening performance can be achieved.

[Brief description of the drawings]

FIG. 1 shows a screw grommet according to one embodiment of the present invention, wherein (A) is a plan view, (B) is a front view,
(C) is a bottom view.

FIG. 2 shows the screw grommet, and (A)
1A is a cross-sectional view taken along line AA of FIG. 1A, and FIG.
It is sectional drawing along the BB line of (A).

FIG. 3 shows the screw grommet, and (A)
FIG. 4 is a cross-sectional view showing a state in which the two members are connected and fixed, and FIG. 4B is a bottom view of a main part showing a state in which each split leg is twisted.

FIG. 4 shows a conventional screw grommet,
(A) is a plan view and (B) is a front view.

FIG. 5 shows the screw grommet, and (A)
4B is a bottom view, and FIG. 4B is a cross-sectional view taken along line BB of FIG.

FIG. 6 shows the screw grommet, and (A)
FIG. 4 is a cross-sectional view showing a state in which the two members are connected and fixed, and FIG. 4B is a bottom view of a main part showing a state in which each split leg is twisted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange part 2 Leg part 3 Split leg part 4 Engagement convex part 5 Slit 6 Screw screw-in hole 7 Screw engagement convex part a One member a1 Circular hole b Other member b2 Mounting hole s screw

Claims (4)

[Claims] 1. A screw grommet for connecting and fixing one member and another member to each other using a screw, wherein a circular leg having a screw screw hole is integrally formed on a lower surface of a flange portion. A plurality of slits penetrating from the outer peripheral surface of the leg portion to the screw screw-in hole to divide the leg portion into three or more divided leg portions, and a circular hole provided in the one member. Alternatively, a screw grommet in which the leg is inserted into a circular hole provided in both of the superposed members and a screw screw hole for screwing a fastening screw into one member or both superposed members is provided. In one of the side edges facing the slit at the tip of each of the divided legs constituting the legs, a screw engagement convex portion protruding toward the adjacent divided legs in the vicinity of the screw screw hole protrudes. Set up A screw grommet characterized in that each of the screw engaging projections is engaged with the outer peripheral surface of the screw when each split leg is twisted by the rotation torque of the screw screwed into the screw insertion hole. 2. The screw grommet according to claim 1, wherein a tip end surface of the screw engagement convex portion is an inclined surface that gradually protrudes from the screw screw hole toward the outer peripheral surface of the leg portion. 3. The screw grommet according to claim 1, wherein a tip end surface of the screw engagement convex portion is a surface parallel to a side surface of an adjacent split leg portion with a slit interposed therebetween. 4. When each of the split legs is twisted, the screw engaging projection of each of the split legs abuts on an adjacent split leg to prevent excessive twisting. 1 to
4. The screw grommet according to any one of the above items 3.