JPH0416012Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention is made of a flexible synthetic resin material and is integrally molded. Legs extending downward from the head are inserted into mounting holes of a panel, etc., and fixed, and the legs are fixed to the upper surface of the head. This invention relates to a screw fastener for attaching an article onto a head by screwing the screw into a vertical hole provided from the head to the inside of the leg.

<Prior art> This type of screw fastener is, for example,
As disclosed in Japanese Patent Publication No. 33204 or Japanese Patent Publication No. 61-16848, generally speaking, when inserting a leg into a mounting hole, the engaging protrusion protruding from the outer surface of the leg is elastically deformed inward and restored after passing through the mounting hole. and is fixed to the panel between the lower surface of the head and the engaging protrusion. Further, when a screw is screwed into the vertical hole from the upper surface of the head in this temporarily secured state, the engaging protrusion expands outward and the screw fastener is more firmly fixed.

In order to ensure that the screw fastener is securely fixed, it is possible to increase the amount of protrusion of the engaging protrusion, but this requires greater force when inserting it into the mounting hole, and the engaging protrusion may be damaged at that time. There is a possibility that On the other hand, if the amount of protrusion of the engagement protrusion is reduced, it can be inserted easily, but since there is no sense of moderation, it is impossible to check whether or not it has been inserted sufficiently, and if the screw is screwed in with insufficient insertion, the engagement protrusion will be inserted. Because it is not fully expanded, the screw fasteners will not be firmly fixed to the panel and may fall out of the mounting holes.

<Problems to be solved by the invention> Therefore, the purpose of the invention is to create a flexible synthetic resin material that can be inserted into the mounting hole with a relatively small force and can be temporarily fastened with a sense of moderation. Our goal is to provide screw fasteners.

<Means for Solving the Problems> According to the present invention, the above object is to provide a head, a leg extending downward from the lower surface of the head, and a vertical hole formed from the upper surface of the head to the inside of the leg. A screw fastener integrally molded from a flexible synthetic resin material, wherein the leg has a recess on its outer circumferential surface and an engagement piece having a shoulder protruding outward from the outer circumferential surface, The engaging piece is provided in the recess with its upper end connected to the lower surface of the head and its lower end connected to both inner edges of the recess, and at least one vertical groove is formed on the outer surface of the engaging piece including the shoulder portion. This is achieved by providing a screw fastener which is characterized by being recessed.

<Function> In this way, when the legs are inserted into the mounting holes,
The engagement piece including the shoulder contacts the periphery of the mounting hole and is largely elastically deformed inward in the radial direction so that the shoulder is pushed into the recess while bending in the vertical direction, that is, in the circumferential direction. However, after passing through the attachment hole, it returns to its original shape and is fixed in the attachment hole between it and the lower surface of the head, so it can be temporarily fastened with sufficient control.

<Embodiments> The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

The screw fastener 1 according to the present invention is shown in FIGS. 1 to 4.
As shown in the figure, a generally square collar-shaped head 2
and legs 3 extending downward from the lower surface 2a. The head 2 can be circular or another polygon. The leg 3 is smaller than the head 2 and has a concentric, generally square cross-sectional shape, with the lower part tapering slightly toward the lower end. Inside leg 3,
A vertical hole 4 is provided which opens in the upper surface 2b of the head and extends to the vicinity of the lower end of the leg 3. This screw fastener 1
is integrally molded from a flexible synthetic resin material such as nylon 6 or polyacetal.

A recess 6 is formed in a pair of mutually parallel side surfaces 5 of the leg 3, extending over the entire length from the lower surface 2a of the head to the lower end of the leg 3. A joining piece 7 is provided. The engagement piece 7 has an upper end connected to the head lower surface 2a, and a lower end connected to both side edges 6a of the recess 6. The outer surface of the engaging piece 7 extends parallel to the side surface 5 by a length corresponding to the thickness of the panel to be attached downward from the lower surface 2a of the head, and is largely inclined outward to form a shoulder 8. The amount of protrusion gradually decreases toward the end, and it slopes gently inward. Further, a single groove 9 is formed in the outer surface of the engagement piece 7 and extends in the vertical direction from the upper end to the vicinity of the lower end. On the other hand, a groove 11 is formed in the other parallel side surface 10 of the leg 3, extending over the entire length from the lower surface 2a of the head to the lower end of the leg 3.

As best shown in FIG. 5, the vertical hole 4 has four slots 12 extending radially from the vertical hole 4 toward between the recess 6 and the groove 11 of the leg 3. It is provided over the entire length up to the bottom of the hole 4. The inner wall surface 12a of the pair of slots 12 on the side closer to the inner surface of the recess 6 is formed into a curved surface having a relatively large curvature and convex toward the center of the vertical hole 4.

As shown in FIG. 6, a rectangular mounting hole 14 slightly larger than the cross-sectional shape of the leg 3 is bored in the panel 13 on which the screw fastener 1 is mounted. leg 3
When the screw fastener 1 is inserted into the mounting hole 14 with the lower end first, the engagement piece 7 is largely elastically deformed inward by the peripheral edge of the mounting hole 14 that contacts the outer surface of the engagement piece 7.
That is, as shown in FIG.
When the head is bent inward, it is simultaneously pushed into the recess 6 and passes through the mounting hole 14, so that the lower surface 2a of the head is attached to the panel 1.
When inserted until it comes into close contact with the top surface of 3, it will return to its original shape. Therefore, the screw fastener 1 can be inserted into the mounting hole 14 with a relatively small force, and has a sufficient sense of moderation, so that it can be securely fixed.

In this way, the screw fastener 1 is fixed between the lower surface 2a of the head and the shoulder 8 of the engagement piece 7 so as to sandwich the periphery of the mounting hole 14, as shown in FIG. A tap pin screw 15 is screwed into the vertical hole 4 of the temporarily fastened screw fastener 1 from above the head 2. Since the outer diameter of the tassel pin screw 15 is larger than the inner diameter of the vertical hole 4, it pushes the bolt 12 apart and the legs 3 expand outward as shown in FIG. For this reason, the engaging piece 7
Since the bolts protrude outward from the above-mentioned temporary fixing, the screw fastener 1 is firmly fixed by the panel 13. In this case, the legs 3 expand outward without any cracks or the like due to the grooves 11 provided in the side surfaces 10. In addition, the inner wall surface 1 of the slot 12 on the recess 6 side
2a is formed with a convex curved surface with a large radius, so that the tuft pin screw 15 can fit into any of the slits 1.
2, and is always properly screwed into the center of the vertical hole 4. Therefore, when an article is attached to the head upper surface 2b with the screw 15, the attachment position will not shift.

9 and 10 show another embodiment of the screw fastener according to the invention. This screw fastener 20 includes a head 21 having substantially the same shape as the screw fastener 1 of the first embodiment, and legs 22 extending downward from the lower surface 21a of the head. However, the upper surface of the head 2
The vertical hole 23 extending from 1b to the inside of the leg 22 has an outer diameter smaller than that of the vertical hole 4 of the first embodiment. Further, a protrusion 26 is formed on the wall surface of the recess 24 immediately behind the engagement piece 25 over the entire length. Vertical hole 2
On the inner peripheral surface of 3, there is a protrusion 27 corresponding to the protrusion 26.
is formed. When the tuft pin screw is screwed into the vertical hole 23, the engagement piece 25 is pushed outward by the protrusions 26 and 27, so that the screw fastener 20 is firmly held by the panel.

In addition, on the side surface 28 of the leg 22, in addition to a vertical groove 29 similar to the groove 11 of the first embodiment, two grooves 3 are provided in parallel from the lower surface 21a of the head to the lower part of the leg 22.
0 is recessed. By providing the three grooves 29 and 30 on the side surface 28 in this way, the flexibility or pliability of the leg 22 on the side surface 28 side is improved, and when tightening the tuft pin screw in the vertical hole 23, Since the legs 22 expand outward without cracking or breaking, they can be fixed more reliably and firmly.

<Effects of the invention> As described above, according to the invention, the engaging piece itself is bent inside the groove, that is, in the circumferential direction, and the engaging piece as a whole has great elasticity so that it can be drawn into the recess, that is, radially inward. By deforming, the leg can be smoothly inserted into the mounting hole with a relatively small force, and a sufficient sense of moderation can be obtained, so that the state of attachment to the panel can be confirmed during temporary fixing. Therefore, the mountability and holding power to the panel are improved, and it can be fixed more firmly and reliably.

[Brief explanation of the drawing]

FIG. 1 is a front view of a screw fastener according to the present invention. FIG. 2 is also a side view. FIG. 3 is also a top view. FIG. 4 is a bottom view as well. FIG. 5 is a sectional view taken along the - line in FIG. 1. FIG. 6 is a longitudinal cross-sectional view taken along the - line in FIG. 1 showing the state of attachment to the panel.
FIG. 7 is a sectional view similar to FIG. 5 showing a deformed state when the mounting hole is inserted. FIG. 8 is a sectional view similar to FIG. 5 after screwing. FIG. 9 is a sectional view similar to FIG. 5 showing another embodiment of the present invention. FIG. 10 is a longitudinal sectional view as well. 1...Screw fixture, 2...Head, 2a...Bottom surface, 2b...Top surface, 3...Legs, 4...Vertical hole, 5...
...Side surface, 6...Recess, 6a...Side edge, 7...Engagement piece, 8...Shoulder, 9...Groove, 10...Side surface, 11...
...Groove, 12...Slot, 13...Panel, 14
...Mounting hole, 15...Tatsu pin screw, 20...Screw stopper, 21...Head, 21a...Bottom surface, 2
1b...Top surface, 22...Legs, 23...Vertical hole, 24
... recess, 25 ... engagement piece, 26, 27 ... protrusion, 28 ... side surface, 29, 30 ... groove.

Claims (1)

[Claims for Utility Model Registration] A screw integrally molded from a flexible synthetic resin material, comprising a head, a leg extending downward from the lower surface of the head, and a vertical hole formed from the upper surface of the head to the inside of the leg. The stop is configured such that the leg has a recess on its outer circumferential surface, and an engagement piece having a shoulder projecting outwardly from the outer circumferential surface has an upper end coupled to a lower surface of the head and a lower end thereof. A screw fastener, which is provided in the recess so as to be connected to both inner edges of the recess, and at least one vertical groove is formed in the outer surface of the engaging piece including the shoulder portion. .