JPH0527689Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a screw grommet used for connecting panels together.

[Problems to be solved by conventional techniques and ideas]

As a connecting member for connecting panels,
A screw grommet made of plastic, which has a screw insertion hole bored in the flange body, and two legs protruding from the outer periphery of the lower end of the insertion hole, facing each other at a predetermined distance. is known (Utility Model Application Publication No. 49-55907). When using this screw grommet, insert the above-mentioned legs into the square mounting holes of the first panel while bending them inward. By elastically returning both leg bodies to their original states upon release, the first panel is supported at the proximal end sides of both leg bodies and brought into contact with the lower surface of the flange body, and in this state, the shaft portion of the screw is moved to the second By sequentially passing the screw through the mounting hole of the panel and the insertion hole of the flange body and inserting it between the legs, the screw formed on the outer periphery of the screw shaft can be inserted into the inner surface of the legs. The screw shaft portion is advanced between the two legs while the corresponding threaded portion is screwed, and thereby the first panel is pressed by the two legs whose lower portions are spread outward, thereby fixing it to the connector. This grommet connects both panels together, but since this grommet is a self-tapping type, if the mounting hole is circular, it will rotate with the screw, so it cannot be applied to circular mounting holes. The drawback is that it cannot be done.

On the other hand, as a screw grommet that can be applied to a circular mounting hole, a structure as shown in FIG. 13 is known (Japanese Unexamined Patent Publication No. 192908/1983). This screw grommet has a bolt insertion hole b formed in the flange body a, and a bolt insertion hole b formed in the flange body a.
A pair of legs c, c facing each other with a predetermined spacing are integrally provided on the outer peripheral edge of the lower end, and a thread d is screwed into the inner peripheral wall at the inner edge of the lower end of these legs c, c. The cylindrical nut bodies e are integrally connected through thin wall portions f, f.

To use this screw grommet, insert the nut body e and both leg bodies c and c into the circular mounting hole h of the first panel g, as shown in FIG. After bringing the lower surface into contact with the first panel g and temporarily fixing the grommet to the first panel g by the engaging protrusions i, i of the legs c, c, in this state, the shaft of the screw j is moved to the first panel g. 2. Sequentially pass through the mounting hole l of panel k and the insertion hole b of flange body a, screw onto nut body e, and rotate screw j. Then, after the screw j advances and its head abuts the second panel k, the nut part e is pulled up in the direction of the legs c and c, the thin parts f and f are broken, and the nut part e is It moves between the legs c and c while pushing the lower parts of the legs c and c outward, and as a result, the legs spread outward press the first panel g and screw it into the screw grommet. , and both panels g and k are connected to each other. In this case, when the legs c, c are pushed apart, the outer surfaces of the legs c, c press the peripheral wall of the mounting hole h of the first panel g, but this pressing force is caused by the nut body e pushing the legs c, The pressure becomes stronger as the grommet progresses through C, so this pressing force prevents the grommet from rotating together with the screw.

However, the screw grommet described in Japanese Patent Application Laid-open No. 61-192908 mentioned above has both leg bodies c and c.
Since it has a structure in which a nut body e is connected to the tip of the
As the axial length of the grommet becomes longer, a relatively long screw j must be used, and after connecting both panels g and k, the screw j
Since the shaft portion of the first panel g protrudes for a long time on the back side of the first panel g, there is a drawback that it cannot be used unless there is sufficient space on the back side of the first panel g.
Furthermore, since the nut body e is pulled up by the screw j and the leg bodies c and c are spread apart, there is a problem that the working time for rotating the screw j becomes long and the working efficiency is poor.

On the other hand, the applicant has found that a screw with a short shaft length can be used, and therefore can be used even when there is not a large space on the back side of the panel to which it is attached (first panel). It is possible to improve work efficiency by shortening the work time required to rotate the screw, and it also does not rotate with the screw even if the mounting hole of the mounted panel is circular. As a method, we proposed a configuration as shown in FIGS. 15 to 17. That is, this screw grommet has a screw insertion hole b' formed in the flange body a', and a plurality of screw grommets (in this example, two ) are provided with protruding legs c' and c', and these legs c' and c' are inserted into the mounting holes of the object to be mounted, and the object is brought into contact with the lower surface of the flange body a', and the screw Insert the shaft into the screw insertion hole above.
b' and enter between the two legs c' and c', and rotate this screw so that the threaded part formed on the outer periphery of the shaft part of the screw is attached to the inner surface of the two legs c' and c'. By threading the corresponding threaded portion and advancing the screw shaft portion between the legs c′, c′, the object to be attached can be mounted with the legs c′, c′ whose lower portions are respectively expanded outward. In a screw grommet that fixes an object by pressing, inverted U-shaped slit holes m and m are formed in both legs c' and c', respectively, and the inside of the slit holes m and m are The upper end of the upper end is a free end, forming claw portions n, n into which the screw is screwed, and both of the above-mentioned claw portions n, n.
The longitudinal intermediate portion of the outer surface of the claw portion is bulged outwardly, and the upper portion of the outer surface of the claw portion is formed into tapered surfaces o and o that gradually protrude outward as they move downward. Note that p is a ring-shaped soft material disposed at the lower part of the flange body a'.

The above-mentioned screw grommet has legs c' and c' whose upper ends are free ends, whose outer surface middle part bulges outward, and whose upper outer surface has a tapered surface that gradually projects outward as it goes downward. o, claw part n having o,
By providing the screw j', as shown in Fig. 18, when the screw j' is screwed in between the legs c' and c', the upper parts of the claw parts n and n spread outward at the initial stage of screwing.
The tapered surfaces o and o press the peripheral wall of the mounting hole h' of the object g' toward the flange body a' (see arrows X and X), and this pressing force covers the lower surface of the flange body a'. is pressed against the attachment, so the tapered surface o,
Since the circumferential wall of the mounting hole h' is strongly held between the lower surface of the flange body a' and the flange body a', the sliding resistance prevents the mounting hole h' from rotating with the screw even if the mounting hole h' is circular. Further, as shown in Fig. 19, as the screwing progresses and the entire lower part of the legs c and c expands outward (see arrows Y and Y), the tapered surfaces o and o touch the peripheral wall of the mounting hole h'. Press harder (see arrows Z and Z),
Since the lower surface of the flange body a' is more strongly pressed against the object to be attached g', the force for preventing co-rotation is further increased.

However, in the screw grommets shown in FIGS. 15 to 17 described above, the amount of outward spread of the claws n and n when the screw j' is inserted between the claws n and n cannot be adjusted. It had the following drawbacks. That is, in this screw grommet, when the screw j' starts to be screwed in, the claws n and n widen, and the attached object
g' bites into the peripheral wall of the mounting hole h', but at this time, the resistance force of the object to the biting of the claws n, n varies depending on the thickness of the object g', and as the object becomes thinner, The smaller the resistance, the more it digs in, whereas the thicker it is, the bigger the resistance, and the smaller the bite. Therefore, when trying to connect the attachment k' to objects g' of various thicknesses using the same screw grommet, the thickness of the claws n and n depends on the thickness of the object g'. The amount of spread is different, and if the spread is too large for screw j', the thread formed on the outer periphery of the shaft of screw j will be less able to engrave the inner surface of the claws n, n, resulting in shallower threading. As a result, there is a problem that the joint strength and the tapping breaking torque at the end of screwing the screw are low. In this case, if the tightening force of the tool is strong when tightening the screw j' with a tool such as an air screwdriver during work, the threads formed on the inner surfaces of the claws n and n will be crushed due to the low breaking torque, and the screw j'' may become idle and the purpose of the installation may not be achieved.

The present invention was developed in view of the above circumstances, and in the screw grommet of the type shown in FIGS. The dimensions of the peripheral wall of the grommet can be kept constant, so even when used for objects of various thicknesses, the thread forming depth of the grommet can be kept constant during self-tapping, and the connection between the screw and the grommet can be kept constant. bond strength,
It is an object of the present invention to provide a screw grommet capable of always securing a certain amount or more of tapping breaking torque at the end of screwing in the screw.

[Means to solve the problem]

That is, in order to achieve the above object, the present invention provides a flange body with a screw insertion hole, and also connects the lower end of the flange body with an insert body to be inserted into the attachment hole of the object to be attached. A screw entrance path is formed in the screw insertion hole in communication with the screw insertion hole into which the screw shaft enters, and a plurality of windows are bored in the peripheral wall of the screw entrance path of the insert body, and a plurality of windows are formed from the bottom wall of these window portions. A claw portion is formed upward with the upper end being a free end, and a longitudinally intermediate portion of the outer surface of each claw portion is bulged outwardly so that the upper portion of the outer surface of the claw portion is provided with a downwardly extending portion. The insert body is formed with a tapered surface that gradually protrudes outward as the insert body is inserted into the mounting hole of the object to be mounted, and the object to be mounted is brought into contact with the lower surface of the flange body. The screw enters the screw entry path through the screw insertion hole, and the screw is rotated so that the threaded portion formed on the outer periphery of the shaft portion of the screw forms a threaded portion corresponding to the threaded portion on the inner surface of each claw portion of the insert body. The screw shaft part is advanced between each claw part while screwing, so that the tapered surface of each claw part expanded outwardly presses the object to be attached and fixes the object. The flange body is provided with a through hole that exists above each of the claws and communicates with the window, and the upper end of each of the claws is inserted into the through hole. To provide a screw grommet characterized in that an outer surface and an outer circumferential wall of a through hole are extended with a predetermined distance between them.

[Effect]

The screw grommet of the present invention has the above-mentioned structure, and has the same effect as the grommet shown in FIGS. The upper end of each claw extends into the through hole with a predetermined distance between the outer surface of the claw and the outer circumferential wall of the hole. At the point when the claw has spread outward by a certain amount, the outer surface of the upper end of the claw comes into contact with the outer circumferential wall of the through hole, and the upper end of the claw is prevented from spreading outward any further. Therefore, according to the present invention, it is possible to control the spread of the claw portion to a certain amount, maintain the thread formation amount of the grommet constant, and secure a predetermined amount of bonding strength and breaking torque between the screw and the grommet. .

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to examples, but the present invention is not limited to the following examples.

〔Example〕

1 to 5 show an embodiment of the present invention, in which the screw grommet is made of flexible plastic.

In the figure, 1 is a disc-shaped flange body having a circular screw insertion hole 2 in the center, and a pair of square through holes 3, 3 are provided on both sides of the screw insertion hole 2 in communication with the insertion hole 2, respectively. They are drilled facing each other. The flange body 1 has a substantially circular ring-shaped protrusion 4 at the center of the lower surface, and a circular ring-shaped soft material groove 5 is formed on the outside of the protrusion 4. Four soft material injection holes 6, 6, 6, 6 are bored at equal intervals from each other in a portion corresponding to the soft material disposing groove 5 of the part, and the soft material is placed in the groove 5. As shown in FIG. 6, a circular ring body 7 is provided by two-color molding with a portion thereof overflowing into the injection holes 6, 6, 6, 6.

Further, at the outer peripheral edge of the lower end of the insertion hole 2 of the flange body 1, two legs 8 having a substantially semicircular cross section are provided below the through holes 3, 3 and facing each other at a predetermined distance. 8 (insert bodies) are drilled with their distal ends spaced further apart from each other than their proximal ends.

Here, rectangular window portions 9, 9 are provided in the leg bodies 8, 8, respectively, projecting along the length direction and communicating with the through holes 3, 3, and these rectangular window portions 9, 9 are provided. The upper ends of the flange body 1 are free ends upward from the lower wall of the flange body 1.
Square claw portions 10, 1 extending into the through holes 3, 3 of
0's are drilled opposite each other. Said claw part 1
The longitudinally intermediate portions of the outer surfaces of Nos. 0 and 10 are bulged outward in a mountain shape, and square groove portions 11 and 11 are formed along the lengthwise direction in the outer widthwise intermediate portions of the outer surfaces. As a result, triangular mountain-shaped projecting plates 12, 12 and 12, 12 are formed at both ends of the outer surfaces of the claw parts 10, 10, respectively, and these projecting plates 1
The longitudinal intermediate portions of 2, 12 and 12, 12 are respectively engagement protrusions 13, 13 and 13, 13,
The above-mentioned engagement projections 1 of the projecting plates 12, 12 and 12, 12
3, 13 and above 13, 13, there is an upper tapered surface 1 that gradually protrudes outward toward the lower end.
4, 14 and 14, 14, and a lower tapered surface 15 that gradually protrudes outward toward the upper end.
15 and 15,15 are provided. Further, the upper end portions of the claw portions 10, 10 are slightly thin-walled extending portions 10.
a, 10a, and the extending portions 10a, 10a are connected to the through holes 3, 3 with their outer surfaces 10b, 10b separated by a predetermined distance from the outer circumferential walls 3a, 3a of the through holes 3, 3 of the flange body 1. located within. Incidentally, on the inner surfaces of the claw parts 10, 10, round grooves 16, 16 for inserting the screw shaft parts are formed along the axial direction, facing each other. Further, the longitudinally intermediate portions of the bases 8a, 8a (portions where the claws 10, 10 are not formed) are also slightly bulged outward in a mountain shape, thereby forming the bases 8a, 8a. , 8a has both side engaging protrusions 17, 17 and 17,
17 is formed.

Furthermore, when inserting the legs 8, 8 of the grommet of this embodiment into the circular mounting hole of the object to be mounted, the claws 10, 10 and the base 8 are inserted as shown in FIG.
a and 8a are bent inward, the diameter of the circular mounting hole is A, and the distance between the outer edges of both claws 10 and 10 when the grommet is in its normal state and when inserted is B.
and B', the distance between the outermost edges of both bases 8a and 8a when the grommet is in its normal state and when inserted, is C and
C' (see Figures 2 and 8), in this example, the above dimensions are B>C, B>A, B'≧A,
It is set so that B′≧C′. in this case,
The distance B between the outermost edges of the claws 10, 10 in a normal state is considerably larger than the diameter A of the attachment hole, and is formed to have the maximum width that can pass through the attachment hole.

When using the screw grommet described above, first, as shown in FIG.
Insert the legs 8, 8 into the holes 9, and attach grommets to the first panel 18. In this case, when the legs 8, 8 are inserted into the mounting hole 19, as shown in FIG. Then both base parts 8a, 8a bend inward together with both claw parts 10, 10 due to the above-mentioned pressing force, and the pressing force is released after insertion, so that both leg bodies 8, 8 return to their original state. As shown in FIG. 7, the first panel 18 is supported on the proximal end side of both legs 8, 8, and the ring body 7 of the flange body 1 is brought into contact with the first panel 18 and temporarily fixed. However, in this state, the claw portion 1
The upper ends of the upper tapered surfaces 14, 14 of 0 and 10 come into contact with the peripheral wall of the mounting hole 19, and the grommet is securely locked to the first panel 18.

Next, the second panel 20 is arranged with its mounting hole 21 aligned with the screw insertion hole 2 of the flange body 1, and as shown in FIG. 2 and enter between the round grooves 16, 16 (screw entry path) of both claws 10, 10, and rotate the screw 22. As a result, the threaded portion 22b formed on the outer periphery of the screw shaft portion 22a is connected to the round groove 16,
The inner surface of the screw shaft portion 22b is carved in a spiral shape, and a threaded portion corresponding to the threaded portion 22b is threaded onto the inner surface of the circular groove 16, 16.
6, the lower parts of the legs 8, 8 open outward, and by pressing the first panel 18 with these legs, the first panel 18 is fixed to the grommet as shown in FIG. This connects the first and second panels 18, 20 to each other.

Therefore, in the above-mentioned grommet, the ring body 7 made of a soft material is provided on the lower surface of the flange body 1, the upper ends of both leg bodies 8, 8 are free ends, and tapered surfaces 14, 14, and 14 are provided on the upper outer surface. 14
By forming the claw parts 10, 10 having
At the initial stage of screwing in the screw 22, the upper ends of the claws 10, 10 open outward and press the peripheral wall of the mounting hole 19 (see arrows As the first panel 18 is pressed against the ring body 7, the upper tapered surfaces 14, 14 bite into the first panel 18, so that the ring body 7
Slip resistance and upper tapered surface 14, 14 and 1
4 and 14 into the first panel 18 prevents the grommet from co-rotating with the screw. Also, as the screw progresses, the 10th
As shown in the figure, the lower portions of the legs 8, 8 expand outward (see arrows Y, Y), and as a result, the upper tapered surfaces 14, 14 and 14, 14 forcefully press the first panel 18 due to the lever principle. Press (see arrows Z, Z),
As a result, the ring body 7 is strongly pressed against the first panel 18 and the sliding resistance increases, so that co-rotation is more strongly prevented. Further, the grommet is firmly fixed to the first panel 18 by the biting.

In this case, in the grommet of this example,
Square through holes 3, 3 are formed in the flange body 1, and upper ends of the claw portions 10, 10 are extended into these through holes 3, 3, and outer surfaces 10b, 10b of these extending portions 10a, 10a are formed. By separating the outer circumferential walls 3a, 3a of the through holes 3, 3 by a predetermined distance,
As shown in Fig. 7, when self-tapping, the claw part 1
0, 10, the outer surfaces 10b, 10 of the extending portions 10a, 10a expand outward by a certain amount.
b hits the outer peripheral wall portions 3a, 3a of the through holes 3, 3,
The upper portions of the claw portions 10, 10 are prevented from expanding outward any further. Therefore, regardless of the thickness of the first panel 18, the spread of the claws 10, 10 is regulated to a certain amount, and the dimensions of the screw entry path are constant, so that the screw 22 can prevent the claws 1 from spreading.
Thread forming depth on the inner surface of 0,10 and claw part 1
Since the amount of biting into the first panel 18 of 0 and 10 is constant, the bonding strength between the screw 22 and the grommet and the tapping breaking torque at the end of screwing the screw 22 are always constant regardless of the thickness of the first panel 18. More than that can be secured. Further, the spread of the claw portions 10, 10 can be freely adjusted as desired by adjusting the length of the interval between the outer surfaces 10b, 10b of the extension portions 10a, 10a and the outer circumferential walls 3a, 3a of the through holes 3, 3. It is possible to obtain a certain amount of bond strength and tapping breaking torque between the screw 22 and the grommet. Furthermore, by forming square grooves 11, 11 on the outer surfaces of the claws 10, 10, this groove 1
Nos. 1 and 11 play the role of meat stealers and prevent sink marks. In other words, a sink mark is a decrease in shrinkage of the resin due to the time for the resin to cool and harden later than in the thin parts when there is a particularly thick part in the entire molded product. By forming the groove part 11 in the claw part 1, it is possible to prevent the claw parts 10, 10 from becoming thick as a whole and prevent sink marks.
The thickness of the middle part in the width direction of 0 and 10 is kept constant. In addition, grooves 11, 11 are formed in the claws 10, 10, veneers 12, 12 are provided on both sides of the grooves 12, 12, and the veneers 12, 12 are made to bite into the first panel 18, thereby reducing the force of biting into the panel. is adjusted to reduce the range of variation in the amount of penetration due to plate thickness.

In the above example, the sliding resistance was increased by placing a soft material on the lower surface of the flange body, and co-rotation could be more effectively prevented. Of course, the present invention also includes a structure in which the above is not provided. In this case, the type of soft material is not limited, but a material with high slip resistance such as a nylon elastomer is preferably used. Furthermore, the means for arranging the soft material is not limited, but
Preferred methods include arranging a ring body made of a soft material under the flange body, or providing a soft material under the flange body by two-color molding.

In addition, in the above example, two legs were formed, but
Three or more may be formed, and other configurations may be modified in various ways without departing from the gist of the present invention.

Furthermore, the screw grommet of the present invention has a first
It is also possible to adopt a configuration for a square hole as shown in FIG. 1 or FIG. 12. That is, in the screw grommet shown in FIG. 11, legs 8', 8' for insertion into square holes are connected to the lower end of a square plate-shaped flange body 1' having screw insertion holes and through holes 3', 3'. At the same time, claw portions 1 similar to those shown in FIGS. 1 to 5 are provided on these legs 8', 8'.
0', 10' are provided, and these claw parts 1
The effects of 0' and 10' are the same as above. Also, the screw grommet in Fig. 12 is
A rectangular hole insert 23 in the form of a rectangular tube with a bottom is provided in series at the lower end of the flange body 1' similar to the one shown in the figure, and claw portions 10 similar to those described above are provided on two mutually opposing side walls of the insert 23. ', 10' are provided, and triangular mountain-shaped engagement protrusions 24, 24 are formed on the outer surfaces of the two side wall parts where the claw parts 10', 10' are not provided, and these claw parts 10', 10' The action and effect of is also the same as above.
Further, the engaging protrusions 24, 24 are connected to the claw portions 10', 1
Since the upper portions 23a, 23a of the inserts 23, 23 are bent inward due to the presence of the windows 9', 9' in which the openings 9' are formed, they are effective as temporary fixing protrusions with a simple structure. A complicated temporary fixing structure can be made unnecessary. Further, the upper parts 23a, 23 of the inserts 23, 23 are removed by self-tapping with the screw.
Since a bulges outward, the engaging protrusions 24, 24 are strongly pressed against the panel, and the grommet and the panel are firmly connected.

[Effect of idea]

As explained above, the screw grommet of the present invention has the above-described structure, thereby regulating the amount of outward spread of the claw portion to a certain amount, and reducing the depth of thread formation on the grommet during self-tapping. Since it is possible to ensure a certain amount or more of the screw and grommet connection strength and breaking torque regardless of the thickness of the object to be attached, the same grommet can be used widely on objects of various thicknesses. It can be used and is very convenient.

In addition, since the screw grommet of the present invention is reliably prevented from rotating together with the screw,
Also suitable for circular mounting holes. In this case, the grommet of the present invention has a short axis and a relatively short screw can be used, so it can be used even when there is not a large space behind the panel to which it is attached.
In addition, the work time for screw rotation is shortened,
This can improve work efficiency.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, with Figure 1 being a front view, Figure 2 being a side view, Figure 3 being a plan view, Figure 4 being a bottom view, and Figure 5 being a bottom view. is Figure 3 V-
6 is a partially omitted sectional view taken along line V in FIG. 3, and FIG. 7 is a sectional view showing the screw grommet of the same example temporarily fixed in the mounting hole of the panel. 8 is an explanatory view showing the state in which the legs of the grommet are inserted into the mounting holes, and FIG. 9 is a sectional view showing the initial state of screwing in when connecting panels using the same grommet. Fig. 10 is a sectional view showing a state in which the panels are connected to each other using the same grommet, Figs. 11 and 12 are perspective views showing other embodiments of the present invention, and Fig. 13 is a conventional grommet for round holes. 14 is a sectional view showing a screw grommet, and FIG. 14 is a sectional view showing a state in which panels are connected to each other using the same grommet.
Figure 7 shows an example of a screw grommet for a round hole, Figure 15 is a front view, Figure 16 is a side view,
Fig. 17 is a longitudinal sectional view, Fig. 18 is a sectional view showing the initial state of screwing in when the same grommet is used to connect panels together, and Fig. 19 is a state in which the panels are connected to each other using the same grommet. FIG. 1...Flange body, 2...Screw insertion hole,
3... Square through hole, 3a... Outer peripheral wall part, 8... Leg body (insert body), 9... Square window part, 10... Claw part,
10a...extending portion, 10b...outer surface, 14...
Upper tapered surface, 18...First panel, 19...Mounting hole, 20...Second panel, 21...Mounting hole, 2
2...screw, 23...insert body.

Claims (1)

[Scope of utility model registration request] A screw insertion hole is bored in the flange body, and an insert body that is inserted into the mounting hole of the object to be attached is connected to the lower end of the flange body, and the insert body communicates with the screw insertion hole to insert the shaft of the screw. A screw entrance path into which the screw enters is formed, and a plurality of windows are bored in the peripheral wall of the screw entrance path of the insert body, and the upper end is a free end extending upward from the bottom wall of these windows. and a longitudinally intermediate portion of the outer surface of each of the claw portions is bulged outward to form a tapered surface that gradually protrudes outward as it goes downward on the upper outer surface of each of the claw portions. Then,
Insert the insert into the mounting hole of the object to be mounted, bring the object into contact with the lower surface of the flange, enter the shaft of the screw into the screw entrance path through the screw insertion hole, and rotate the screw. Then, the threaded portion formed on the outer periphery of the shaft portion of the screw threads a threaded portion corresponding to the threaded portion on the inner surface of each claw portion of the insert body, and the screw shaft portion is advanced between the respective claw portions. This is a screw grommet that fixes the object by pressing the object to be attached with the tapered surface of each of the claws expanded outward, wherein each of the claws is attached to the flange body. A through hole is formed in the upper part and communicates with the window part, and the upper end of each claw part is placed in the through hole with a predetermined distance between the outer surface of the claw part and the outer circumferential wall of the through hole. A screw grommet characterized by extending.