JP2532208Y2 - Screw grommet - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw grommet used for quickly connecting other members to a plate material, and more particularly to a screw grommet suitable for attaching a plate material having a different thickness.

[0002]

2. Description of the Related Art As shown in FIG. 10, a conventional screw grommet of this type has a head portion having a flange, and a locking portion protruding from the head portion and stopping on the outer surface thereof. There is a screw grommet which has a screw insertion hole from the head to the leg, and a plate material is sandwiched between the lower surface of the head of the screw grommet and the locking portion. Then, a screw is inserted into the insertion hole after the temporary fixing, and the leg of the screw grommet is expanded to fix the plate material.

[0003]

However, in such a conventional screw grommet, the dimensions of the head and the locking portion are determined by the thickness of the plate material sandwiched between the lower surface of the head and the locking portion. It was common and was not suitable for use with sheet materials of different thicknesses. Such inconvenience is liable to occur when the thickness of the body panel differs depending on the type of vehicle or the mounting portion, such as when fastening parts to the body panel on an assembly line of an automobile, and the like. In addition, it was necessary for the line operator to perform the fastening operation while selecting the screw grommet to be used one by one. The present invention has been made in view of the problems of the related art, and an object thereof is to provide one or more locking recessed steps in the locking portions of the screw grommet legs to provide one step. An object of the present invention is to provide a screw grommet capable of attaching parts and the like to a plurality of plate materials having different thicknesses by using a screw grommet.

[0004]

According to the present invention, the screw grommet 1 is provided with a flange 2a.
And a leg 3 integrally projecting from the head 2. The head 2 has an insertion hole 4 for a screw A from the head 2 toward the leg 3. At least a part of the portion 3 is a locking portion 5 that can be bent toward the insertion hole 4, and is outside the leg 3 of the locking portion 5 and is substantially orthogonal to the insertion direction of the leg 3. It is configured to have at least two or more locking recessed steps 5a, 5b that are directed toward the direction and shallow on the tip side of the leg 3 and shallow on the side of the flange 2a.

[0005]

The screw grommet 1 according to the present invention has two or more locking concave steps 5a, 5b which are shallow on the tip side of the leg 3 and deep on the side of the flange 2a. When mounting plate members C and D having different plate thicknesses are attached to a member B such as a part, the locking concave steps 5a and 5b are attached to the mounting plate members C and D.
And functions to produce a play-free mounting state.

[0006]

1 to 9 show a typical embodiment of the present invention. FIG. 1 is a perspective view of a screw grommet according to the present invention, and FIG. 2 is a partially broken view from the same side. FIG. 3 is a partially broken cross-sectional view as viewed from the front, FIG. 4 is an enlarged cross-sectional view of the locking portion in the temporarily fixed state, FIG. 5 is an enlarged cross-sectional view of the locking portion in the same mounting state, 6 is an enlarged cross-sectional view of the locking portion showing the temporarily fixed state, FIG. 7 is a central vertical cross-sectional view from the side showing the temporarily fixed state, and FIG. 8 is a central vertical cross-sectional view showing the same fixing state. FIG. 9 and FIG. 9 are central longitudinal cross-sectional views as viewed from the front showing the mounting state.

The screw grommet 1 according to the present invention comprises:
A plastic material is formed from a head 2 and a leg 3 projecting from the head 2, having an insertion hole 4 from the head 2 toward the leg 3, and giving sufficient elasticity. It is preferable that it is comprised. As shown mainly in FIGS. 1 to 3, the head 2 has a disk-shaped flange 2 a that protrudes outward,
An umbrella-shaped portion 2b that is thinner than the flange 2a and that extends inclining toward the leg 3 from the outer peripheral edge of the flange 2a. Tsuba 2a
A leg portion 3 of a substantially quadrangular prism protrudes from the rear surface of the leg portion 3, and a pair of opposing side surfaces of the leg portion 3 are directed toward the head 2 with the vicinity of the distal end of the leg portion 3 as a base end. A locking claw 6 is provided which protrudes outward from the portion 3. Further, on the other pair of side surfaces of the leg 3, a seat 7 is formed at a position continuous with the flange 2 a, and a locking portion 5 is formed on the tip side of the leg 3 from the seat 7.
As shown mainly in FIG. 2, the locking portion 5 is provided in a width direction outside the leg portion 3, that is, in a direction substantially orthogonal to the insertion direction of the leg portion 3. A slope 5c extending outward from the leg 3 toward the side of the part 2 and a head 2 extending from the top of the slope 5c.
And a second locking concave step 5b further provided on the side of the head 2 from the first locking concave step 5a. The first locking concave step 5a is
A downward tapered surface 5a 'that is inclined from the slope 5c toward the head 2 toward the flesh side of the leg 3 and a leg that extends from the downward tapered surface 5a' toward the head 2 and the leg. 3 comprises a rising tapered surface 5a "which bulges outward. The second locking concave step 5b is further separated from the rising tapered surface 5a" of the first locking concave step 5a by the head 2. The downward tapered surface 5b 'which is inclined so as to fall deeper than the downward tapered surface 5a' of the first locking concave step 5a toward the meat portion side of the leg portion, and the downward tapered surface 5b ' An insertion hole 4 into which the screw A is screwed is provided to penetrate from a substantially center of the flange 2a toward the leg 3 from the substantially center of the flange 2a. It is.

The screw grommet 1 according to the present embodiment is constructed as described above. When a member B such as a mounting part is mounted on a mounting plate C having a thickness L ', as shown in FIG. The mounting member B and the mounting hole formed in the plate C are aligned with each other, and the screw grommet 1 is inserted into the mounting hole until the back surface of the head 2 hits the front surface of the member B. At this time, the umbrella-shaped portion 2b elastically and conveniently comes into contact with the surface of the member B. In this embodiment, the thickness of the member B and the length of the seat 7 are substantially equal, and the mounting hole of the member B is large enough to receive the seat 7, so that the seat lower surface 7a And the back surface of the member B are located on the same surface.

Further, a pair of walls 5b ″ and 5 of a second locking recessed step 5b provided on both opposing side surfaces of the leg 3 are provided.
Since the dimension between b ”and the dimension of the mounting hole of the plate C are set to be substantially equal, the member B and the plate C are moved downward from the back surface of the head 2 and the second locking concave step 5b. In other words, when the leg 3 is inserted into the mounting hole, the slope 5c of the leg 3 first comes into contact with the hole edge of the mounting hole, and is further inserted. The locking portion 5 of the leg 3 is bent toward the insertion hole 4 due to the elasticity of the material,
When the slope 5c passes through the mounting hole, the upwardly tapered surface 5a "of the first locking concave step 5a comes into contact with the hole edge of the mounting hole. Thereafter, the upwardly tapered surface 5a" As a result, the member B and the plate material C are brought into the temporary fixing state by engaging the downward tapered surface 5b ′ of the second locking concave step 5b with the hole edge of the mounting hole. Can be put on.

On the other hand, the locking claw 6 also comes into contact with the hole edge of the mounting hole and passes through the mounting hole while being bent toward the insertion hole 4 side. State. The locking claw 6 is used when the holding state of the temporary fastening of the member B and the plate material C is deviated by vibration or the like between the back surface of the head 2 and the downward tapered surface 5b ″ of the second locking concave step 5b. The screw grommet 1 has a function of preventing the screw grommet 1 from slipping out of the plate material C. After the temporary fixing as described above, the screw A is screwed into the insertion hole 4 as shown in FIGS. Since the outer diameter of the screw A is slightly larger than the inner diameter of the insertion hole 4, the screw 3 is screwed in so that the leg 3 expands as shown by a chain line in FIG.
Are securely fixed.

Next, when the member B is mounted on the plate D having a thickness L "which is greater than the thickness L 'of the plate C, the mounting holes provided for the member B and the plate D are aligned in advance. The plate B and the plate member D are overlapped with each other, and the leg 3 of the screw grommet 1 is inserted to a position where the back surface of the head 2 of the screw grommet comes into contact with the surface of the member B, whereby the member B and the plate member D It is sandwiched between the back surface and the downward tapered surface 5a 'of the first locking concave step portion 5a and is temporarily fastened as shown in Fig. 6. At this time, the umbrella-shaped portion 2b is elastically moved to the member B
Abuts conveniently on the surface.

Also, a pair of downward tapered surfaces 5a 'of a first locking concave step 5a provided on both opposing side surfaces of the leg 3,
Since the dimension between 5a 'and the dimension of the mounting hole of the plate D are set substantially equal, the member B and the plate D are connected to the head 2
And the downwardly tapered surface 5a 'of the first locking concave step 5a. That is, when the leg 3 is inserted into the mounting hole, the slope 5c of the leg 3 is first brought into contact with the hole edge of the mounting hole, and by further insertion, the locking portion 5 of the leg 3 is inserted due to the elasticity of the material. When the inclined surface 5c passes through the mounting hole, the upwardly tapered surface 5a ″ of the first locking concave step 5a comes into contact with the hole edge of the mounting hole. The upward tapered surface 5a ″ is elastically restored by passing through the mounting hole. As a result, the downward tapered surface 5a ′ of the first locking concave step 5a is engaged with the hole edge of the mounting hole, and B and the plate material D can be placed in the temporary fixing state.

When the leg 3 is inserted into the mounting hole, the locking claw 6
Also, it comes into contact with the hole edge of the mounting hole, passes through the mounting hole while being bent toward the insertion hole 4, and returns elastically after passing through. After the temporary fixing as described above, the screw A is screwed into the insertion hole 4 so that the leg 3 is inserted as shown by the chain line in FIG.
Is outwardly expanded to securely fix the member B and the plate material D.

In the embodiment described above, the locking recessed step of the locking portion 5 is formed as the first and second locking recessed stepped portions 5a and 5b of two upper and lower stages. In order to be able to correspond to the plate material of different thickness, the locking concave step is three or more steps,
A plurality of stages may be provided to form a screw grommet. After the screw grommet is temporarily fastened to the mounting plate by the back surface of the head 2 and the locking concave steps 5a and 5b, the screw is inserted into the insertion hole via the member B, and the lower surface of the screw flange and the surface of the head 2 are fixed. The member B and the plate material C or the plate material D may be fixed so that the member B is held by the member B and the plate materials C and D are held by the back surface of the head 2 and the locking concave steps 5a and 5b.

[0015]

[Effect of the invention] The screw grommet according to the invention is:
With the above-described configuration, when members such as mounting parts are fastened to the mounting plate, plate materials having different thicknesses can be assembled without play. In particular, when parts are fastened to a body panel on an automobile assembly line, each part can be effectively fastened to portions having different panel thicknesses, and workability is improved.

[Brief description of the drawings]

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

FIG. 2 is a partially broken side view of the screw grommet.

FIG. 3 is a partially cutaway front view of the screw grommet.

FIG. 4 is an enlarged cross-sectional view of a main part of a locking portion in a temporarily fixed state.

FIG. 5 is an enlarged cross-sectional view of a main part of a locking portion showing an attached state.

FIG. 6 is an enlarged cross-sectional view of a main part of a locking portion showing a temporarily fixed state.

FIG. 7 is a central vertical cross-sectional view as viewed from the side, showing a temporarily fixed state.

FIG. 8 is a central longitudinal sectional view showing a mounted state as viewed from the side.

FIG. 9 is a central vertical cross-sectional view showing a mounted state as viewed from the front.

FIG. 10 is a partially broken side view showing a conventional screw grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw grommet 2 Head 2a Flange 3 Leg 4 Insertion hole 5 Locking part 5a First locking concave step 5b Second locking concave step A screw B member C plate material D plate material

Claims (1)

(57) [Scope of request for utility model registration] 1. A head having at least an outwardly projecting flange and a leg integrally projecting from the head, wherein the head is inserted from the head toward the insertion side of the leg. In a screw grommet having an insertion hole for a screw, at least a part of the leg portion is a locking portion that can be bent toward the insertion hole side, and on the outside of the leg portion of the locking portion, A screw grommet that is oriented in a direction substantially perpendicular to the insertion direction of the leg, and is provided with at least two or more locking concave steps that are shallow at the tip end of the leg and deep at the flange side. .