KR20070076401A - Grommet - Google Patents

Abstract

A grommet is provided to prevent a gap between members from being occurred by improving a structure such that the members having a hole inserted therein the grommet are fixed to each other in an overlapped shape. A grommet includes a female member(1) and a male member. At least a part of an outer surface of a body(11) of the female member comprises a deviation prevention face portion(11f). The deviation prevention face portion includes a plurality of convex portions and a plurality of concave portions. The convex portions are formed around the body of the female member. The concave portions are formed between the convex portions. The deviation prevention face portion is formed in a longitudinal direction of the body of the female member.

Description

Grommet {GROMMET}

1 is a plan view of the grommets

2 is a bottom view of the grommet

3 is a front view of the grommet (back view, right side view, left side view is the same as the front view)

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a cross-sectional view taken along the line B-B of FIG.

6 is a plan view of the male member 2

7 is a bottom view of the male member 2.

8 is a front view of the male member 2 (back view, right side view, left side view are the same as the front view)

9 is a cross-sectional view taken along the line C-C of FIG.

10 is a cross-sectional view taken along the line D-D of FIG.

11 is a plan view of the arm member 1

12 is a bottom view of the arm member 1

13 is a front view of the arm member 1 (back view, right side view, left side view are the same as the front view)

14 is a cross-sectional view taken along the line E-E of FIG.

15 is a cross-sectional view taken along the line F-F in FIG.

Fig. 16 is a front view showing the fixed state of the members P and P '.

17 is a cross-sectional view taken along the line G-G of FIG.

18 is an external configuration diagram of a comparative example (temporary fixed state)

19 is an external configuration diagram of a comparative example (completely fixed state)

20 is a schematic configuration diagram of a test method

Explanation of symbols on the main parts of the drawings

P, P '-Part H-Hole for grommet

1-arm member 10-base

11-Torso 11c-Slip-resistant side

2-male 20-head

21-shaft

Patent Document 1: Japanese Patent No. 3332138

The present invention relates to an improvement of grommets used for fixing members mutually having a hole into which gromet is inserted in a superimposed form.

It consists of a female member (clip body) having a base (flange) and a body (leg) and a male member (pin) having a head and a shaft. Patent document as a synthetic resin grommet (clip), which is divided into two body parts (dividing parts), and the four body parts are elastically opened to the outside by injecting a male member into the female member. There is something shown in 1.

According to the above-described grommet, the body of the grommet female member is inserted into these through holes after the two panels are superimposed so that the through holes formed in the two panels communicate with each other. The two panels can be firmly fixed between the base and the outwardly extending body component by press-fitting the shaft portion of the shaft so that a gap does not occur between these panels.

That is, as described above, the trunk member of the arm member that is opened outwardly has a force in the separation direction that generates a gap between both panels or between two panels acting on either side. It acts as a force in a direction narrowed inwardly, which is referred to as " or ", but functions to keep both panels in close contact with the force by the elasticity.

By the way, in this kind of synthetic resin grommet, for example, when the elastic deformation force of the trunk portion of the female member decreases over time under the condition that the separation force continuously acts on the two panels. (Cryptic deformation), this prevents the panels from coming into close contact with each other by the body portion formed outwardly.

The main problem to be solved by the present invention is that the gaps are not generated as long as possible between the members fixed by this kind of grommet.

In the first invention of the present application for achieving the above object, the grommet consists of a female member having a base and a body and a male member having a head and a shaft, After inserting the body part of the arm member, press the shaft of the male member into the body part and elastically deform the body part of the arm member to the outside to prevent the mutual separation between the members having the grommet holes. And a grommet, wherein at least a portion of an outer surface portion of the trunk portion of the arm member is a misalignment prevention surface portion comprising a plurality of convex portions continuous in the direction in which the trunk portion rotates and concave portions formed between the convex portions; In addition, the said shift prevention surface part is formed by the forced ejection of the shaping | molding die which spreads out in the longitudinal direction of the said trunk | drum. " .

According to the above-described configuration, the body is elastically deformed to the outside while the misalignment prevention surface portion formed in the body portion is pressed tightly to the edge portion of the hole for the grommet, so that the body portion is fixed to each other by the grommet in the separation direction. Even if the force is applied, the contact position between the trunk portion and the edge portion of the grommet hole becomes difficult to be changed, so that deformation of the trunk portion such as creating a gap between these members is less likely to occur. Therefore, creep deformation of the trunk portion can be prevented from easily occurring. In addition, even when the elastic deformation force of the trunk portion is lowered, the gap between the members can be prevented from easily occurring due to the action of the displacement preventing surface portion. When the member having the grommet hole is made of synthetic resin, the edge of the grommet hole can be pierced by the elastic deformation to the outside of the trunk portion, so that the gap between the members does not occur further. You can do that. Moreover, the shift | offset | difference prevention surface part which functions as mentioned above can be formed easily and appropriately by the metal mold | die of 2 surface division.

Moreover, in the 2nd invention of this application for achieving the said subject, a grommet consists of a female member provided with the base member and the trunk | drum, and the male member provided with the head and the shaft part, and the arm was connected to the hole for the grommmet which communicated. After inserting the body part of the member, press the shaft of the male member into the body part and elastically deform the body part of the arm member to the outside, thereby preventing the separation between the members having the grommet holes. At least a part of the outer surface portion of the trunk portion of the arm member is a misalignment prevention surface portion formed of a plurality of convex portions extending in the direction in which the trunk portion is circumferentially formed and a concave portion formed between the convex portions, and at the base of the arm member. In which the circumferential concave portion surrounding the base end of the trunk portion is formed on the protruding side of the trunk portion.

According to the above configuration, in addition to the action of the misalignment prevention surface portion of the first invention, even when there is a burr or the like generated at the time of forming the grommet hole at the edge of the grommet hole, the burr The body portion of the arm member can be inserted into the hole for the grommet while keeping the base of the arm member in close contact with the surface of the member having the hole for the grommet by accommodating the inside of the circumferential recess. In addition, since the support recess of the elastic deformation of the trunk portion of the arm member can be moved further from the tip of the trunk portion by the circumferential concave portion, even when the member is a thin panel, the proximal end of the trunk portion at the edge portion of the grommet hole is used. It can be pressed appropriately by elastic deformation. Moreover, when shape | molding a shift | offset | difference prevention surface part like the said 1st invention, the said winding recessed part can also be shape | molded by the said shaping | molding mold without trouble.

In addition, in the third invention of the present application for achieving the above object, the grommet is composed of a female member having a base and a body, and a male member having a head and a shaft, After inserting the body part of the member, press the shaft of the male member into the body part and elastically deform the body part of the arm member to the outside, thereby preventing the separation between the members having the grommet holes. The body part of the arm member is divided into two or more body parts by slits formed from the front end to the proximal end, and a through hole through which the shaft of the male member is fitted is formed at the base of the arm member. The through hole has a branch hole portion communicating with the slit, and the inner wall of the at least one branch hole portion has an engaging convex portion. It is comprised by the elastic piece, The shaft part of a male member has the rib corresponding to the said slit formed from the front-end | tip to the base end, The temporary fastening part which each said engagement convex part fits into the rib of the said shaft part, respectively is hooked up. A completely fixed engagement recess is provided at a proximal end of the shaft portion than the alignment recess and the temporary fixing engagement recess, and the male engagement portion of the male member is inserted into the body portion of the female member. "When the shaft part was press-fitted, the engagement convex part of the arm member was fitted."

According to the above configuration, the elastic piece formed on the base is elastically deformed once by inserting the shaft portion of the male member into the through hole of the female member in the direction in which the rib of the male member fits into the slit through the branch hole portion, and then hangs thereafter. The engagement convex portion can be engaged with the temporary fixing engagement concave by the elastic restoration of the elastic piece at the position where the alignment convex portion is fitted into the temporary fixing engagement concave, whereby the female member and the male member are thereby fitted. It can be assembled so as not to separate the body portion of the arm member without elastic deformation. Then, in this state of temporarily assembling the male member and the female member, the body portion is inserted into the grommet hole of the member to the position where the base of the female member is caught by the grommet hole. The elastic piece is elastically deformed again by press-fitting into the arm member to remove the engaging convex part from the temporary fastening engaging concave, and then the elastic piece of the elastic piece at the position where the engaging convex part is fitted into the fully constrained engaging concave. By restoring, the engagement convex portion can be engaged with the completely fixed engagement concave portion, whereby two or more members in which the body portion of the arm member is elastically deformed, that is, the grommet holes are stacked to communicate with each other By maintaining the fastening form between the base of the arm member and the trunk portion elastically deformed outward, It is possible to maintain a state in which block the liver.

The removal of the male member from the body of the female member is prevented by the engaging convex portion formed on the base of the female member, which does not easily degrade the elastic deformation characteristic over time, so that the fixing state between the members can be stably maintained for a long time. In addition to being able to maintain, the reuse of grommets can be done without any problems. Moreover, since the engagement convex part is formed in the base of the arm member, when this engagement convex part is engaged with the fully engaged engagement concave of the shaft part of the male member, it has a length which does not protrude from the tip of the trunk part. A shaft part can be comprised.

In the grommet according to the third aspect of the invention, the inner wall of the branched hole portion at the opposing position of the through hole may be an elastic piece provided with engaging projections, respectively.

In such a case, the omission of the shaft portion of the male member from the trunk portion of the female member can be prevented respectively on both sides in the radial direction of the shaft portion.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, the best form for implementing this invention based on FIGS. 1-17 is demonstrated.

1 to 5 show a state in which the male member 2 is temporarily fixed to the female member 1, and FIGS. 6 to 10 show the male member 2, and FIGS. 16 and 17 show a state in which the two members P and P 'including the grommet holes H are fixed by grommet, respectively.

The grommet which concerns on this embodiment is used in order to fix the members P and P 'provided with the grommet hole H in mutually overlapping form.

The grommet is composed of a female member (1) having a base (10) and a body portion (11) and a head (20) and a shaft portion (21). In addition, the grommet inserts the body portion 11 of the female member 1 into the grommet hole H communicated with each other, and then moves the shaft portion 21 of the male member 2 into the body portion 11. By press-fitting to elastically deform the trunk portion 11 of the arm member 1, the separation between the members P and P 'provided with the grommet holes H is prevented. The grommet is made of synthetic resin.

The base end of the trunk portion 11 is integrally connected to one side of the base 10 of the arm member 1. The base 10 is sized so as not to fit into the grommet hole H, and the arm member 1 moves the trunk portion 11 to a position where the base 10 is caught by the grommet hole H. Can be inserted. The base 10 has a through hole 10a into which the shaft portion 21 of the male member 2 is fitted. The trunk portion 11 has a space 11a through which the shaft portion 21 of the male member 2 passes, and the space 11a and the through hole 10a communicate with each other.

The head 20 of the male member 2 is integrally formed with one end of the shaft portion 21. The head 20 is sized so as not to fit in the through hole 10a of the female member 1, and the male member 2 is armed to a position where the head 20 is caught in the through hole 10a. It can be press-fitted into the member 1.

As shown in FIGS. 11-15, the base 10 of the arm member 1 is comprised so that disk shape may be provided, and the through-hole 10a is provided in the center part. The through hole 10a includes a central hole portion 10b along an imaginary circle approximately equal to the outer diameter of the core portion 21a of the shaft portion 21 forming the cylindrical shape of the male member 2, It consists of four branch hole parts 10c mentioned later formed in the radial direction successively to this center hole part 10b. In addition, the other side surface of the through hole 10a of the base 10, that is, the side opposite to the one side where the body portion 11 is connected, has an annular granular portion enclosed along the outer periphery of the base 10. 10d is formed, and when the male member 2 is press-fitted into the female member 1, the head 20 of the male member 2 is accommodated in the projected dimension of the granular portion 10d.

Moreover, the trunk | drum 11 of the arm member 1 is divided into four trunk | drum constituent pieces 11c by the slit 11b formed from the front-end | tip to the base end. Specifically, as shown in Figs. 11 to 15, the trunk portion 11 is configured by dividing the hollow cylindrical body into four trunk portion pieces 11c each having substantially the same size by the slits 11b. It is. 11 d of ridges are formed in the inner side of the front end side of the said trunk | drum part 11c, and the space 11a in the trunk part 11 becomes narrow gradually toward the front end side of this trunk part 11, and so on. have.

The branch hole portion 10c formed in the base 10 of the arm member 1 is formed to be in communication with the slit 11b, so that an approximately equal interval is formed between the adjacent branch hole portions 10c in the circumferential direction. It is.

In the present embodiment, the inner wall 10e of the branch hole portion 10c at the opposite position of the through hole 10a is engaged in two branch hole portions 10c of the four branch hole portions 10c. It consists of the elastic piece 10f provided with the convex part 10g. Specifically, as shown in Figs. 11, 12, and 14, the inner wall 10e of the two branch hole portions 10c and the granular portion 10d are longer than the width of the branch hole portion 10c. A groove-shaped through hole 10h is formed, and the inner wall 10e of the branch hole portion 10c functions as an elastic piece 10f by the groove-shaped through hole 10h. On the inner side face toward the inside of the through hole 10a in the elastic piece 10f, the thickness direction of the elastic piece 10f (base 10) is approximately at the center of the longitudinal direction (the circumferential direction of base 10). The rib-shaped engagement convex part 10g extended along the thickness direction of ()) is formed.

On the other hand, the shaft portion 21 of the male member 2 has a rib 21b corresponding to the slit 11b formed from its tip to its base. Specifically, as shown in Figs. 6 to 10, the shaft portion 21 is formed from the head portion 20 from the head portion 20 along the axial direction of the core portion 21a having a substantially cylindrical shape and the core portion 21a. The four ribs 21b which are substantially equally spaced between the continuous and adjacent ribs 21b over the front-end | tip of 21 are provided.

The space 11a in the trunk portion 11 of the arm member 1, that is, the space 11a in the four trunk portion pieces 11c, is formed between the base end and the ridge 11d. Although substantially the same as the outer diameter of the core part 21a, it is smaller than the outer diameter of the said core part 21a in the formation position of the said ridge part 11d (refer FIG. 4 and FIG. 5). Therefore, when the shaft portion 21 of the male member 2 is press-fitted into the female member 1, the trunk portion of the female member 1 is formed by the core portion 21a of the shaft portion 21 of the male member 2. When the tip side of 11c is pushed outward, the trunk portion 11c is opened to the outside while elastically deforming around the proximal end (see FIGS. 16 and 17).

As shown in FIG. 8 and FIG. 17, the male member 2 is inserted into the female member 1 at a position located between adjacent ribs 21b on the distal end side of the shaft portion 21 of the male member 2. A recess 21c is formed in which the raised portion 11d of the trunk portion 11c is fitted by elastic restoring at a position where the shaft portion 21 of the shaft portion 21 is fully press-fitted. The grommet in the grommet hole H of the members P and P 'is caused by the body portion 11 of the arm member 1 elastically deformed by the complete fixing of the arm member 1 and the arm member 1. The state which prevented it from falling out can be stably maintained also by fitting the said recessed part 21c and the raised part 11d.

As shown in Fig. 14, the lower surface 11e on the distal end side of the arm member 1 in the ridge 11d of the trunk portion 11c moves toward the proximal end of the trunk portion 11c. As the proximity is inclined in a gradually increasing direction, and therefore, when a certain force is applied to the head 20 of the male member 2 with a tool or the like in the completely fixed state of the male member 2 and the female member 1, The male member 2 can be pulled out of the female member 1.

Then, the temporary fixing engagement recesses into which the engagement convex portions 10g formed on the base portion 10 of the female member 1 are fitted to the ribs 21b of the shaft portion 21 of the male member 2, respectively. The part 21d and the completely fixed engagement recessed part 21e located in the base end side of the axial part 21 rather than this temporary fixing engagement recessed part 21d are provided. In addition, when the shaft portion 21 of the male member 2 is press-fitted into the body portion 11 of the female member 1, the engaging convex portion of the female member 1 is fitted into the completely fixed engagement recessed portion 21e. 10g is fitted.

Specifically, as shown in Figs. 8 to 10, in each rib 21b formed on the shaft portion 21 of the male member 2, the rib 21b and the head 20 are completely joined to the position where the ribs 21 are joined. The fixing engagement recesses 21e are formed, respectively, and the temporary engagement recesses 21d are formed at positions approximately midway in the longitudinal direction of the ribs 21b (see Fig. 4). . In the present embodiment, the protrusion dimension of the rib 21b in the core portion 21a is the dimension from the inlet of the branch hole portion 10c in the through hole 10a to the engaging convex portion 10g. It is slightly larger than.

Therefore, in the present embodiment, the shaft portion 21 of the male member 2 is inserted into the through hole 10a of the female member 1, and the rib 21b of the male member 2 is slit through the branch hole portion 10c. The elastic piece 10f formed on the base 10 is elastically deformed by inserting it in the direction fitted to 11b, and then the engagement convex part 10g is fitted to the temporary fixation recessed part 21d. The engagement convex portion 10g can be engaged with the temporary fixation engagement recessed portion 21d by the elastic restoration of the elastic piece 10f in the losing position, whereby the arm member 1 and The male member 2 can be assembled so as not to be separated in a state in which the trunk portion 11 of the female member 1 is not elastically deformed (see FIGS. 3 to 5).

The base 10 of the female member 1 is formed in the grommet hole H of the members P and P 'in a state in which the male member 2 and the female member 1 are temporarily assembled (fixed). (F) inserts the trunk portion 11 to the position where the grommet hole H is engaged, and in this state presses the shaft portion 21 of the male member 2 into the female member 1 so that the elastic piece 10f is pressed. ) Is elastically deformed again to remove the engagement convex portion 10g from the temporary fixing engagement concave portion 21d, and then the engagement convex portion 10g is fitted to the completely fixing engagement concave portion 21e. By the elastic restoration of the elastic piece 10f at the position, the engagement convex portion 10g can be engaged with the completely fixed engagement concave portion 21e, whereby the body of the arm member 1 Two or more members (P, P ') in which the portion 11 is elastically deformed, that is, the grommet holes H communicate with each other, are overlapped with the base 10 of the arm member 1 and the outer side thereof. By maintaining the fastening form between the body portion 11 that is elastically deformed, it is possible to maintain a state where the separation between the members P and P 'is prevented (see FIGS. 16 and 17).

The engagement of the male member 2 in the trunk portion 11 of the female member 1 is a locking convex portion 10g formed in the base 10 of the female member 1 in which elastic deformation characteristics are not easily degraded with time. ), It is possible to stably maintain the fixed state between the members P and P 'for a long time, and to reuse the grommet without difficulty. Moreover, since the engagement convex part 10g is formed in the base 10 of the female member 1, this engagement convex part 10g hangs for the complete fixing of the axial part 21 of the male member 2, When it engages with the fitting recessed part 21e, the axial part 21 can be comprised by the length which the axial part 21 does not protrude at the front-end | tip of the trunk part 11 with.

In this embodiment, the inner convex portions 10e of the branched hole portions 10c at the opposite positions of the through holes 10a in the base 10 of the arm member 1 respectively engage the convex portions 10g. Since it is the provided elastic piece 10f, the omission of the axial part 21 of the male member 2 in the trunk part 11 of the female member 1 is prevented in the radial direction both sides of this axial part 21, respectively. can do.

Moreover, in this embodiment, at least one part of the outer surface part of the trunk part 11 of the arm member 1 is formed between the several convex part which continues in the direction which circumscribes this trunk part 11, and these convex parts. It is set as the shift | offset | difference prevention surface part 11f which consists of recessed parts. That is, as shown in FIGS. 13-15, each of the four trunk | drum parts 11c which comprise the said trunk | drum 11 has the said shift prevention surface part 11f in the place except the front end side and the base end side. Formed.

In this kind of grommet, the elastic deformation force of the trunk portion 11 of the arm member 1 may decrease over time (creep deformation). This is particularly likely to occur when the separation force is continuously applied between the members P and P 'fixed by the grommet or when the grommet is exposed to large temperature changes at that time. When the elastic deformation force of the arm member 1 is lowered, it is difficult for the grommet to exert a repulsive force in the direction of eliminating the gap generated between the members P and P 'by the separation force. The gap between the members P and P 'is generated when one of these members P and P' is a resin panel, and under severe conditions, the grommet hole H formed in the resin panel is also creep-deformed in the panel. As it becomes wider by, it becomes more remarkable.

As shown in Figs. 18 and 19, it consists of a male member 100 having a base 101 and a body portion 102, and a male member 200 having a head portion 201 and a shaft portion 202. The body portion 102 of the arm member 100 is divided into four body member pieces 102b by the slit 102a, and is press-fitted by the male member 200 into the female member 100. Comparative example grommet (hereinafter, simply referred to as "comparative example") of a synthetic resin configured so that four body member pieces 102b are elastically opened outward, and grommet of the embodiment according to the present invention (hereinafter, Only referred to as 'example'), and each was tested in the following way. In the comparative example, the shift prevention surface part 11f similar to an Example is not formed.

(1) A panel made of polypropylene with a grommet hole (diameter 10 mm) and a stainless steel frame provided with a grommet hole (diameter 10 mm) in the upper frame part (thickness 2 mm). Ready.

(2) In the state where the grommet holes of the frame are communicated with the grommet holes of the panel with each other, as shown in FIG. After inserting the trunk portion 11 {the trunk portion 102 in the comparative example} of the (100)}, the shaft portion 21 (the shaft portion in the comparative example) of the male member 2 (the male member 200 in the comparative example)} The lower surface of the panel and the upper surface of the upper frame part by press-fitting into the body parts 11 and 102 of the arm members 1 and 100 to open the body parts 11 and 102 outward. Was pressed.

(3) In the state of supporting the panel, a weight of 500 g was hung on the frame in close contact with the lower surface of the panel.

④ Place the test specimen prepared in ③ (see Fig. 20) in a thermostat, and leave it for 6 hours in an atmosphere of 90 degrees Celsius, and then heat and cool the test using one cycle of leaving it for 6 hours in an atmosphere of -40 degrees Celsius. The cycle was repeated. And the clearance gap between the lower surface of a panel and the upper surface of an upper frame part was measured after completion | finish of predetermined cycle, respectively.

The results are shown in Table 1.

In the experimental example, the gap between the lower surface of the panel and the upper surface of the upper frame was maintained at 0.5 mm even in the 20th cycle. In the comparative example, the gap reached 2 mm (in Table 1, circular data A plot line comprising points relates to an embodiment, and a plot line comprising square data points relates to a comparative example).

In the grommet according to the present embodiment, the body portion 11 is elastically deformed outward while the deviation preventing surface portion 11f formed in the body portion 11 is pressed against the edge portion mainly of the hole H for the grommet. Since the separation force acts on the members P and P 'fixed to each other by the grommet, the contact position between the trunk portion 11 and the edge of the grommet hole H is hardly changed. Deformation of the trunk portion 11 such that a gap is generated between these members P and P 'is rarely generated. Therefore, creep deformation of the trunk portion 11 can be prevented from easily occurring. In addition, even when the elastic deformation force of the trunk portion 11 is lowered, the gap can be prevented from easily occurring between the members P and P 'by the action of the shift preventing surface portion 11f. When the members P and P 'having the grommet holes H are made of synthetic resin, the edge portions of the grommet holes H are mainly prevented from shifting due to elastic deformation to the outside of the trunk portion 11 ( Since it is possible to penetrate 11f), it is possible to prevent the gap between members P and P 'from occurring further.

Moreover, in this embodiment, the said shift | offset | difference prevention surface part 11f is formed by the forced removal of the shaping | molding mold which spreads out in the longitudinal direction of the said trunk | drum 11, and is taken out.

Specifically, as shown in FIG. 14, the trunk portion 11 passes through the edge portion of the base portion 10 on the side that is in contact with the trunk portion 11 of the base portion 10 of the arm member 1. Not shown to form the trunk portion 11 side with respect to one side mold not shown to form a base 10 side assembled by a virtual line segment (x) position orthogonal to the axis of the forming line (parting line) When the other side mold is opened out in the axial direction of the trunk portion 11, the misalignment preventing surface portion 11f is formed by the inner surface of the other side mold. Prior to removing the mold of the other mold, the core pin forming the inside of the trunk portion 11 is first removed, even if the height of the convex portion constituting the misalignment preventing surface portion 11f and the depth of the concave portion are relatively large. It is possible to form the mold.

Therefore, in this embodiment, 11 f of misalignment prevention surface parts which function as mentioned above can be formed easily and appropriately by the metal mold | die of 2 surface division.

Moreover, in this embodiment, the circumferential concave part 10i which surrounds the base end of this trunk part 11 is formed in the protrusion side of the trunk part 11 in the base 10 of the arm member 1, have.

Therefore, even if there is a burr or the like generated at the time of formation of the grommet hole H at the edge portion of the grommet hole H, the bur can be accommodated in the circumferential recess 10i. The base 10 of the member 1 is brought into close contact with the surfaces of the members P and P 'having the grommet holes H, and the female member 1 is inserted into the grommet holes H. The body portion 11 can be inserted.

In addition, since the support concave point of the elastic deformation of the trunk portion 11 of the arm member 1 can be moved further from the tip of the trunk portion 11 by the circumferential recess 10i, the members P and P '. Even in the case of a thin panel, the proximal end of the trunk portion 11 can be appropriately pressed to the edge of the grommet hole H by elastic deformation.

In this embodiment, since the said shift prevention surface part 11f is formed by the forced removal of the shaping | molding die which spreads out in the longitudinal direction of the trunk | drum 11, the said molding shaping | molding, ie, the said round shaping | molding by said other shaping | molding die, The portion 10i also has a feature that can be molded without any problems.

According to the present invention, it is possible to prevent the gap from being generated as long as possible between the members fixed to each other by the grommet for a long time.

Claims (4)

It is composed of a female member having a base and a body and a male member having a head and a shaft. The shaft of the male member is inserted into the body after inserting the body of the female member into the hole for the gromet. As a grommet made of synthetic resin which press-fits and elastically deforms the torso of the arm member to the outside, thereby preventing clearance between members having the holes for the grommet, At least a part of the outer surface portion of the trunk portion of the arm member is a misalignment prevention surface portion composed of a plurality of convex portions continuous in the direction in which the trunk portion rotates and concave portions formed between the convex portions, And the misalignment preventing surface portion is formed by a forced ejection of a molding die, which is spread out in the longitudinal direction of the body portion. It consists of a female member having a base and a body and a male member having a head and a shaft, and inserts the body of the female member into the grommet holes communicated with each other, and then presses the shaft of the male member into the body. A grommette made of synthetic resin that prevents separation between members provided with the gromet holes by elastically deforming the body portion of the member to the outside, At least a part of the outer surface portion of the trunk portion of the arm member is a misalignment prevention surface portion consisting of a plurality of convex portions that are continuous in the direction in which the trunk portion is circumferentially formed and a concave portion formed between the convex portions, A grommets, wherein a circumferential recess is formed around the proximal end of the trunk portion at the protruding side of the trunk portion at the base of the arm member. It consists of a female member having a base and a body and a male member having a head and a shaft, and inserts the body of the female member into the grommet holes communicated with each other, and then presses the shaft of the male member into the body. A grommette made of synthetic resin that prevents separation between members provided with the gromet holes by elastically deforming the body portion of the member to the outside, The body part of the arm member is divided into two or more body parts by slits formed from its tip to the base end, The base of the female member is provided with a through hole into which the shaft portion of the male member is fitted, and the through hole has a branch hole portion communicating with the slit. The inner wall of at least one branch hole part is comprised by the elastic piece provided with the engagement convex part, The shaft portion of the male member has a rib corresponding to the slit formed from its tip to its base end, The rib of the shaft portion is provided with a temporary fixing engagement recess into which the engagement protrusions are fitted, and a completely fixing engagement recess located on the proximal side of the shaft portion than the temporary fixing engagement recess. A grommet characterized in that the engaging convex portion of the female member is fitted into the completely fixed engaging recess when the shaft portion of the male member is pressed into the trunk portion of the female member. The method according to claim 3, The inner wall of the branch hole part in the opposing position of the said through hole is an elastic piece provided with the engagement convex part, respectively, The grommet characterized by the above-mentioned.

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