JPH08240211A - Screw grommet - Google Patents

Abstract

PURPOSE: To provide a screw grommet usable without cooperative rotation even in a round hole by providing a leg body having a hollow part which can expand its diameter by screwing a male screw therein and a stopper means mounted to the outer peripheral part of the leg bady, bitten into the peripheral wall and blocking the leg bod from rotation, or the like. CONSTITUTION: When a mounting member 40 is fixed to a panel P with a tapping screw 24, first a U-shaped turn stopper 34 is fitted in an engaging groove 30 of a leg body 16 of a screw grommet 10 to force the leg body 16 temporarily fixedly bitten into a mounting hole 20. Then, the stopper 34 is bitten into the peripheral wall of the mounting hole 20 and functions to block the rotation of the leg body 16. Next, when the tapping screw 24 inserted into a hole 42 of the mounting member 40 is screwed into a hollow part 28 of the leg body 16, the coorpertive turning of the leg body 16 is blocked by the stopper 34. The leg body 16 is expanded by scewing the tapping screw 24 and the screw grommet 10 is firmly locked on the panel P.

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 connecting two members with a male screw.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, when fixing a mounting member 40 to a panel P with a tapping screw 24, a screw grommet 80 is often used.

The screw grommet 80 is provided with a leg body 84 which is inserted into and locked in a square hole 82 formed in the panel P. A flange 88 having an insertion hole 86 into which the tapping screw 24 is inserted is provided at the upper end of the leg body 84.

The screw grommet 80 is used as follows. First, the flange 88 is the panel P
Until it comes into contact with the leg 84 of the screw grommet 80.
Is inserted into the square hole 82 and temporarily fixed. Next, the mounting member 40
With the panel P and the holes 4 formed in the mounting member 40.
Insert the tapping screw 24 into the 2
8 into the insertion hole 86.

Here, when the tapping screw 24 is screwed in, the thread portion engraves the inner wall of the leg body 84,
Push 4 outwards. As a result, the screw grommet 80 is firmly locked in the square hole 82, and
Tapping screw 24 is screw grommet 80
Fixed to.

By the way, if the leg 84 rotates together with the tapping screw 24,
Cannot be screwed into the inner wall of the leg 84, nor can the leg 84 be pushed out. Therefore, the conventional screw grommet 80 can be used only for a square hole, and cannot be used for a round hole drilled with a drill or the like on site.

[0007]

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to provide a screw grommet which can be used even in a round hole.

[0008]

The screw grommet according to claim 1 is a screw grommet in which a male screw is inserted and locked in a mounting hole formed in a member to be mounted, and the male screw has a hollow portion. A leg body that can be expanded in diameter by screwing, a flange provided at an end portion of the leg body, a through hole that penetrates the flange and communicates with the hollow portion, and the mounting that is attached to an outer peripheral portion of the leg body. It is characterized by having stopper means that bites into the hole peripheral wall and prevents rotation of the leg body.

In a screw grommet according to a second aspect of the present invention, the stopper means has a locking groove formed in the outer peripheral surface of the leg body along the axial direction, and the bent portion is bent in a U shape so that the bent portion has the bent portion. It is characterized in that it is composed of a metal member that is locked in the locking groove so as to be positioned on the tip side of the body.

In the screw grommet according to a third aspect of the present invention, the stopper means has a locking groove formed in the outer peripheral surface of the leg body along the axial direction, and a rod-shaped metal locked in the locking groove. It is characterized by being composed of a member.

A screw grommet according to a fourth aspect is a screw grommet in which a male screw is inserted and locked in a mounting hole formed in a member to be mounted, and a leg having a hollow portion into which the male screw can be screwed. A flange provided at an end portion of the leg body, a through hole penetrating the flange and communicating with the hollow portion, and protruding outward from the leg body and bending toward the hollow portion side when inserted into the mounting hole. It is characterized by having a possible claw body and a metal plate fitted on the outer side surface of the claw body.

[0012]

In the screw grommet according to claim 1,
The leg is inserted into the mounting hole and temporarily fixed until the flange comes into contact with the edge of the mounting hole formed in the mounted member. Stopper means is attached to the outer peripheral portion of the leg body, and it bites into the hole peripheral wall of the attachment hole to prevent the leg body from rotating.

Therefore, even if the male screw is inserted into the hollow portion of the leg body (having a smaller diameter than the outer diameter of the male screw) through the through hole and screwed in, the leg body does not rotate and the inner wall of the hollow portion is carved. While pushing the legs outward. As a result, the screw grommet is locked to the attached member, and the attaching member is attached to the attached member with the male screw. By providing the stopper means in this way, co-rotation of the screw grommet can be prevented even if the mounting hole is not a square hole.

In the screw grommet according to the second aspect of the present invention, the engaging groove is formed on the outer peripheral surface of the leg body along the axial direction, and the metal member bent in a U shape is engaged with the engaging groove. To be done. The metal member bites into the peripheral wall of the mounting hole to prevent the leg from rotating. Further, since the bent portion of the metal member is located at the tip of the leg, the tip of the male screw can be covered.

In the screw grommet according to the third aspect of the present invention, the locking groove is formed on the outer peripheral surface of the leg body along the axial direction, and the rod-shaped metal member is locked in the locking groove. The metal member bites into the peripheral wall of the mounting hole to prevent the leg from rotating. In addition, the rod-shaped metal member facilitates processing.

In the screw grommet according to the fourth aspect, the leg having the hollow portion is inserted into the mounting hole and temporarily fixed until the flange comes into contact with the edge of the mounting hole formed in the mounted member. At this time, the claws protruding outward from the legs elastically bend toward the hollow portion. On the outer surface of this claw body,
The metal plate is fitted in, and when the leg body is inserted into the mounting hole, the metal plate bites into the hole peripheral wall of the mounting hole to prevent the leg body from rotating.

As a result, even if the mounting hole is not a square hole,
Even if the male screw is inserted into the hollow portion through the through hole and the claw body is widened outward, the legs do not rotate together even when screwed.

[0018]

1 to 3, the screw grommet 10 according to the first embodiment has a disk-shaped flange 12. From the bottom surface of this flange 12, slit 1
4, a leg body 16 formed by cutting the cylindrical body into two along the axial direction extends. Furthermore, this leg 16
Is divided by a slit 18 formed from the middle portion to the tip. The leg 16 can be expanded in two directions with the slit 14 as a boundary.

A tapered surface 16A is formed at the tip of the leg 16 and the tip is tapered. The leg 16 can be easily inserted into the mounting hole 20 of the panel P by being guided by the tapered surface 16A.

On the other hand, a through hole 22 into which the tapping screw 24 can be inserted is formed in the center of the flange 12. At the end of the through hole 22, a mortar-shaped guide portion 26 is formed toward the tip of the leg 16. Further, a hollow portion 28 having a diameter smaller than the outer diameter of the tapping screw 24 is formed from the terminal end of the guide portion 26 to the tip end of the leg body 16. The tapping screw 24 screwed into the hollow portion 28 pushes the leg body 16 outward while carving the inner wall of the hollow portion 28.

The slit 1 is formed on the outer surface of the leg 16.
A locking groove 30 is extended on the extension line of 8. The locking groove 30 extends to the back surface of the flange 12 and is recessed 3
Forming 2. A metal turn stopper 34 bent in a U shape is locked in the locking groove 30.
In this turn stopper 34, the bent portion 34A has a leg 16
Located on the slit 18 across the tip of the
The open end 34B enters the recess 32 of the flange 12, and the outer peripheral portion projects from the outer peripheral surface of the leg body 16. As a result, the turn stopper 34 does not disengage from the locking groove 30 even if it receives a twisting force. Further, a protrusion 36 is provided on the inner wall portion at the tip of the leg 16 so as to project from the turn stopper 34.
The bent portion 34A is locked. The material of the turn stopper 34 may be a square bar or a round bar.

Next, the operation of the screw grommet 10 according to this embodiment will be described. First, the locking groove 30 of the leg 16
To the leg 16 until the flange 12 abuts the edge of the mounting hole 20 of the panel P.
Is temporarily inserted into the mounting hole 20 and temporarily fixed. At this time, the turn stopper 34 bites into the peripheral wall of the mounting hole 20 to prevent the leg 16 from rotating. Further, by setting the outer diameter of the turn stopper 34 to be larger than the hole diameter of the mounting hole 20, the turn stopper 34 is elastically deformed and a moderation feeling can be given at the time of temporary fixing. You. Furthermore, since it is not necessary to form an anchor portion on the screw grommet 10, the degree of freedom in the shape of the screw grommet 10 is increased, and the tolerance for the change in the plate thickness of the panel P is increased.

Next, the tapping screw 24 is inserted into the hole 42 in which the mounting member 40 is formed, and the through hole 2
It is screwed into the hollow portion 28 of the leg body 16 through 2. At this time, since the turn stopper 34 bites into the hole peripheral wall of the mounting hole 20, the leg 16 does not rotate together,
While tapping the inner wall of the hollow portion 28 with the tapping screw 24, the leg 16 is pushed outward. As a result, the screw grommet 10 is firmly locked to the panel P, and the mounting member 40 is mounted by the tapping screw 24. In this way, even if the mounting hole 20 is a circular hole, the turn stopper 34 prevents co-rotation.

The screw grommet 4 shown in FIG.
As shown in FIG. 4, the slit 46 cuts the leg 48 so as to expand the diameter in two directions, and the locking groove 50 is formed on the outer peripheral surface of the cut leg 48 from the start end of the tapered surface 48A to the flange 12. It may be formed. This locking groove 50
A bar-shaped turn stopper 52 can be fitted to prevent the co-rotation. As a result, the turn stopper 3
Processing of 4 becomes easy. Further, the flange may have an umbrella-shaped suction cup shape instead of the disk shape when the flange surface is required to have a sealing property.

Next, the screw grommet according to the second embodiment will be described. As shown in FIGS. 5 to 7, the screw grommet 54 of the second embodiment is provided with a disk-shaped flange 58 having a rectangular through hole 56 formed in the central portion. A cylindrical leg 62 having a hollow portion 60 extends from the flange 58.

The outer surface of the leg body 62 is cut in a U shape, and a claw body 64 whose free end is on the flange 58 side projects outward. On the outer surface of the claw body 64, an inclined surface 64A that is inclined toward the tip of the leg body 62 is formed, and is pressed against the edge of the mounting hole 20 at the time of insertion to bend the claw body 64 toward the hollow portion 60 side. It has become. Further, a stepped portion 64B is formed on the flange 58 side of the inclined surface 64A, and the mounting hole 2
It is designed to be locked at the edge of 0. Further, an elevation surface 64C is formed from the step portion 64B toward the flange 58, and when the leg body 62 is inserted into the mounting hole 20, the elevation surface 64C corresponds to the hole peripheral wall.

Further, a groove 66 is formed at the center of the inclined surface 64A, the stepped portion 64B, and the upright surface 64C so that a leg piece 70 of a metal clip 68, which will be described later, engages with the groove portion 66. .

Further, the leg 62 is provided on the inner surface side of the claw 64.
A guide surface 64D that is inclined toward the tip of the tapping screw 24 is formed so as to guide the tapping screw 24 into the hollow portion 60. The distance below the guide surfaces 64D facing each other is set to be smaller than the outer diameter of the tapping screw 24, and the tapping screw 24 has a hollow portion 6
When it is screwed into 0, the pawl body 64 is pushed outward and expanded as shown in FIG.

On the other hand, from the through hole 56 of the flange 58,
A metal clip 68 is attached.
The clip 68 includes a long plate-shaped substrate 72 located in the through hole 56, and leg pieces 70 extending downward from both ends of the substrate 72 and engageable with the groove portion 66. The leg piece 70 includes an inclined surface 64A, a step portion 64B, and an upright surface 6.
It is bent so as to correspond to the outer surface shape of 4C, and is attached from the free end side of the pawl body 64 through the through hole 56. Further, the substrate 72 is formed with a through hole 74 through which the tapping screw 24 penetrates.

Next, the operation of the screw grommet according to this embodiment will be described. First, as shown in FIG. 6, the clip 68 is fitted from the through hole 56 of the flange 58, and the leg piece 70 is engaged with the groove portion 66 of the claw body 64. Here, the leg body 62 is pushed into the mounting hole 20 and temporarily fixed until the flange 58 comes into contact with the edge portion of the mounting hole 20 of the panel P. At this time, the leg piece 70 of the clip 68 bites into the hole peripheral wall of the mounting hole 20 to prevent the leg body 62 from rotating.

Next, the tapping screw 24 is inserted into the hole 42 in which the mounting member 40 is formed, and is further screwed into the hollow portion 60 of the leg body 62 through the through hole 74 of the clip 68. At this time, the tapping screw 24 presses the guide surface 64D of the pawl body 64 to push the pawl body 64 outward. On the other hand, the tapping screw 24 cuts the inner wall of the hollow portion 60 and is locked by the screw grommet 54. As a result, the screw grommet 54 is firmly locked to the panel P, and the mounting member 40 is mounted by the tapping screw 24. Thus, even if the mounting hole 20 is a circular hole, the clip 68 can prevent co-rotation.

[0032]

Since the present invention has the above-mentioned structure, the tapping screw can be screwed in without rotating even in a round hole. Therefore, it can be applied to a drill hole drilled on site.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a screw grommet according to a first embodiment.

FIG. 2 is a side view showing a mounting procedure of the screw grommet according to the first embodiment.

FIG. 3 is a side view showing a mounted state of the screw grommet according to the first embodiment.

FIG. 4 is an exploded perspective view showing a modified example of the screw grommet according to the first embodiment.

FIG. 5 is an exploded perspective view showing a screw grommet according to a second embodiment.

FIG. 6 is a side view showing a procedure for attaching the screw grommet according to the second embodiment.

FIG. 7 is a side view showing an attached state of the screw grommet according to the second embodiment.

FIG. 8 is a perspective view showing a conventional screw grommet.

FIG. 9 is a side view showing a mounting state of a conventional screw grommet.

[Explanation of symbols]

 12 flange 16 leg 22 through hole 30 locking groove (stopper means) 34 turn stopper (metal member) 56 through hole 58 flange 62 leg 64 claw 68 metal plate (clip)

Claims (4)

[Claims] 1. A screw grommet in which a male screw is screwed into an attachment hole formed in a member to be attached and screwed with a male screw, the leg having a hollow portion, the diameter of which can be expanded by screwing the male screw, and the leg. And a through hole that penetrates the flange and communicates with the hollow portion, and a stopper that is attached to the outer peripheral portion of the leg body and that cuts into the hole peripheral wall of the attachment hole to prevent rotation of the leg body. A screw grommet having means. 2. The stopper means has a locking groove formed along the outer peripheral surface of the leg body along the axial direction, and is bent in a U shape so that the bent portion is located on the tip side of the leg body. The screw grommet according to claim 1, wherein the screw grommet is formed of a metal member that is locked to the locking groove. 3. The stopper means is composed of a locking groove formed in the outer peripheral surface of the leg body along the axial direction, and a rod-shaped metal member locked in the locking groove. The screw grommet according to claim 1, which is characterized. 4. A screw grommet in which a male screw is inserted and locked in a mounting hole formed in a member to be mounted, and a leg having a hollow portion into which the male screw can be screwed, and an end of the leg. A flange provided, a through hole that penetrates the flange and communicates with the hollow portion, a claw body that protrudes outward from the leg body and is flexible toward the hollow portion side when inserted into the mounting hole, and the claw A screw grommet having a metal plate fitted to the outer surface of the body.