CN100398847C - fastener - Google Patents

Abstract

A fastener comprising a pin, a grommet, and a clamping member, wherein the pin includes a head and a shank, the grommet includes a flange portion and a barrel portion, and the clamping member Including an inwardly guiding support arm and an outwardly guiding clamping piece, the head includes: a support portion for supporting the inwardly guiding support arm of the clamping member; an accommodation chamber for accommodating the clamping member The side of the clamping piece that guides outwards is to guide along the central direction of the shank; And the pressing surface is used to press the clamping piece that is led outwards of the clamping member at the shank of the pin outwards, and forms There are opening windows for positioning the outwardly directed clamping tabs of the clamping member inside and out at the cylindrical portion of the grommet.

Description

fastener

technical field

The present invention relates to a fastener for fastening interior or exterior parts or the like of an automobile to a predetermined body panel.

Background technique

Although not specifically stated, this prior art fastener consists of two parts, a pin made of synthetic resin and a grommet made of synthetic resin, the former pin member being provided with a disc-shaped head part and a cylindrical-shaped stem part hanging from the lower surface of the head, the stem part is formed with a large-diameter groove and a small-diameter groove at its side along the axial direction, and the latter grommet member is provided with a disc-shaped A flange portion and a cylinder portion in the shape of a cylinder hanging down from the lower surface of the flange portion, the flange portion is formed with an opening for inserting the shank of the pin at its center, and the cylinder portion is constructed so that it The peripheral wall is divided into a plurality of divided legs by slits, and the inner surfaces of the front end portions of the respective divided legs are formed with expansion protrusions for engaging with the large-diameter groove and the small-diameter groove of the above-mentioned stem portion individually. (see, for example, Japanese Patent No. 3332138).

In addition, when actually fixing a trim panel constituting an automobile interior part to a body panel, first, the shank portion of the pin is inserted into the cylindrical portion of the grommet from the front end side thereof to provide a nailed state, wherein the expansion projection formed at the inner surface of the front end of each separate leg of the grommet engages with a small diameter groove formed at the shank of the pin, and when the cylindrical portion of the grommet When inserted into each connecting hole of the trim panel and the body panel aligned with each other in this state, and when the head of the pin is pushed to completely contact the flange portion of the grommet, in this case, each separates The expanded projections of the legs of the grommet engage the large diameter grooves of the stem, and the separate legs of the grommet expand to open outwardly, thereby securing the trim panel to the side of the body panel.

Therefore, although in the case of the fasteners of the prior art, the advantage of being able to simply fix the trim panel and the body panel is achieved, on the other hand, in the state where the trim panel is fixed, since the trim panel and the body panel pass through The relationship of the flange portion of the grommet made of synthetic resin and the separate leg members clamped from the inside and the outside, obviously, the clamping force for clamping the body panel to the hole edge of the connection hole is weakened, therefore, cannot Apply greater clamping force.

Contents of the invention

The present invention has been developed to effectively solve the problems posed by prior art fasteners. According to a first aspect of the present invention, there is provided a fastener comprising three parts: a pin made of synthetic resin, a grommet made of synthetic resin, and a clamping member made of metal, wherein The pin includes a head and a shank, the grommet includes a flange portion and a barrel portion, and the clamping member includes an inwardly directed support arm and an outwardly directed clamping tab, and wherein the A support portion for slidably supporting an inwardly directed support arm of the clamping member, a side for accommodating an outwardly directed clamping piece of the clamping member to be guided along the central direction of the stem, and an accommodating cavity with A pressing surface that presses outwardly the outwardly directed clamping tabs of the clamping member at the shank of the outer pin and is formed for directing the outwardly directed clamping members at the cylindrical portion of the grommet The clamping tabs are placed inside and outside the opening window through which the flange portion of the grommet made of synthetic resin and the outwardly extending clamping member made of metal protrude from the opening window. Guided clamping tabs to clamp the object to be fixed.

According to a second aspect of the invention, on the basis of the first aspect of the invention, the support portion formed at the shank of the pin includes an engagement for engaging so that the inwardly directed support arm of the clamping member hangs down at its lower end edge, and in a drooping state, the clamping member is housed in a housing chamber formed at the shank of the pin.

According to a third aspect of the invention, based on the second aspect of the invention, the support portion comprises an engagement edge constituting an inclined surface along the inwardly directed support arm of the inclined clamping member.

According to a fourth aspect of the present invention, on the basis of the first to third aspects of the present invention, the clamping member includes an outwardly guiding detachment pawl on its side opposite to the inwardly guiding support arm, and the guard The flange portion of the eyelet includes a snap portion for snapping the anti-removal pawl.

According to a fifth aspect of the present invention, in addition to the fourth aspect of the present invention, the upper surface of the buckle portion included in the flange portion of the grommet is formed into a tapered shape.

According to a sixth aspect of the present invention, on the basis of the fourth aspect of the present invention, the buckle portion included in the flange portion of the grommet includes an upper wall and a lower wall, wherein the upper surface of the upper wall is formed into a tapered shape, On the other hand, the lower wall extends diametrically on the lower side of the upper wall, and the anti-off claws of the clamping member enter into the recessed space demarcated between the upper wall and the lower wall.

According to a seventh aspect of the present invention, on the basis of the fourth aspect of the present invention, the inwardly directed support arm of the clamping member is capable of extending along the direction of the support portion at least at the lower end region of the support portion formed at the shank of the pin. Movement in the inner and outer directions, in the state of moving the inwardly guided support arm along the inner direction of the support part, the anti-off claw of the clamping member can pass the buckle part, while moving inward along the outer direction of the support part In the state of the guided support arm, the detachment prevention pawl of the clamping member cannot pass through the buckle portion.

According to an eighth aspect of the present invention, on the basis of the first aspect of the present invention, the head of the pin includes a thick-walled upper plate and a thin-walled lower plate, and a space for inserting a tool is divided between the upper plate and the lower plate. groove.

According to a ninth aspect of the present invention, on the basis of the first aspect of the present invention, the lower edge of the opening window formed at the cylindrical portion of the grommet is close to the lower edge of the outwardly leading clamping piece of the clamping member. Relatively superficial.

According to a tenth aspect of the present invention, on the basis of the first aspect of the present invention, the clamping member includes a pair of clamping members, the cylindrical portion of the grommet passes through a plurality of narrow slots in the divided legs Divided into two or more separate leg parts by a seam, the separate leg parts opposite each other on one side are formed with open windows for placing the outwardly directed clamping tabs of each clamping member inside and externally, and the clamping member is formed with an expansion projection which is pressed outward by engaging with the shank of the pin on its inner surface side.

According to an eleventh aspect of the present invention, in addition to the first to tenth aspects of the present invention, a pair of movement-preventing walls protrude from both side edges of the accommodating chamber formed at the shank of the pin.

According to a twelfth aspect of the present invention, there is provided a fastener comprising three parts: a pin made of synthetic resin, a grommet made of synthetic resin, and a clamping member made of metal, wherein the pin includes a head and a shank, the grommet includes a flange portion and a barrel portion, and the clamping member includes an outwardly directed support arm and an outwardly directed clamping tab, wherein the pin is formed to receive the clamping member One side of the outwardly leading clamping piece of the clamping piece is guided along the central direction of the shaft with a receiving cavity, and a pressurizing force for pressing the outwardly leading clamping piece of the clamping member outward at the shaft On the surface, the flange portion or the cylindrical portion of the grommet is formed with a support portion for holding the outwardly guiding support arm of the clamping member, and the cylindrical portion is formed with the clamping tab for guiding the outwardly guiding of the clamping member Opening windows placed inside and outside, and outwardly directed clamping by a flange portion of a grommet made of synthetic resin and a clamping member made of metal projecting outwardly from the opening window pieces to clamp the object to be fixed.

According to a thirteenth aspect of the present invention, on the basis of the twelfth aspect of the present invention, when the pressing surface formed at the shank of the pin presses the outwardly leading clamping piece of the clamping member outward, Elastic bending is formed at the clamping member, and when the outwardly leading clamping piece of the clamping member is received by the accommodation chamber formed at the shank of the pin, the clamping member elastically returns along the direction of eliminating the elastic bending, And the outwardly directed clamping tabs of the clamping members enter from open windows formed at the cylindrical portion of the grommet.

According to a fourteenth aspect of the present invention, in addition to the thirteenth aspect of the present invention, the flange portion of the grommet is formed with a groove-shaped support groove extending from the inner hole thereof in the enlarged diameter portion. , and the outwardly directed support arms of the clamping members are held by the support grooves.

According to a fifteenth aspect of the present invention, on the basis of the fourteenth aspect of the present invention, the support groove is provided with a protruding portion, and the outwardly guiding support arm of the clamping member is provided with a protrusion for engaging the protruding portion. Groove part.

According to a sixteenth aspect of the present invention, in addition to the twelfth aspect of the present invention, the outwardly leading support arm of the clamp member is pivotally held by the support portion of the grommet.

According to the seventeenth aspect of the present invention, on the basis of the sixteenth aspect of the present invention, the outwardly guiding support arm of the clamping member is configured as an arc-shaped hook, and is supported by the inner side of the hook as a fulcrum. Pivot hold.

According to an eighteenth aspect of the present invention, in addition to the sixteenth aspect of the present invention, a side surface of the flange portion of the grommet is partitioned with a space for allowing the outwardly directed support arm of the clamp member to pivot.

According to a nineteenth aspect of the present invention, in addition to the sixteenth aspect of the present invention, one side of the head of the pin is partitioned with a space for allowing the outwardly guided support arm of the clamp member to pivot.

Therefore, according to the first aspect of the present invention, when the inwardly directed support arm of the clamping member is supported by the support portion formed at the shank of the pin, the clamping member moves downward while passing through the inwardly directed support arm One side of the sliding, outwardly directed clamping tab is housed in the receiving chamber of the shank so that when the shank of the pin is inserted into the cylindrical portion of the grommet, the pin and grommet are nailed and simultaneously The clamping member is at the inside of the cylindrical portion, and then, when the pin and the grommet are inserted into the respective connecting holes of the object to be fixed aligned with each other, further, by the operation of the pressing surface on the side of the rod , the shank of the pin is pushed fully into the cylindrical portion of the grommet until the head of the pin contacts the flange portion of the grommet, the outwardly directed clamping tabs of the The open window formed at the cylindrical portion of the ring protrudes outwards so that the object to be secured is clamped from the inside and outside of it between the flange portion of the grommet made of synthetic resin and the clamping member made of metal Between the outwardly guiding clamping pieces, and compared with the structure of the prior art, the object to be fixed is firmly fixed by a larger clamping force.

According to the second aspect of the invention, when the inwardly directed support arm of the clamping member engages with the joint edge of the support portion formed at the pin's shank to sag, the clamping member itself along the center of the pin's shank The direction is inclined, and the outwardly leading clamping piece is accommodated in the receiving chamber of the shank, so that the shank of the pin is facilitated to be pushed into the cylindrical part of the grommet and supports the clamping member at the same time, in this state , the outwardly leading clamping piece of the clamping member enters into the open window formed at the cylindrical portion of the grommet, so similarly, even when inserted into the connection hole of the object to be fixed, the clamping The outwardly directed clamping lugs of the components do not constitute interference. According to the third aspect of the present invention, the joint edge of the supporting portion constitutes an inclined surface along the inwardly directed supporting arm of the inclined clamping member, so that the clamping member itself can be further firmly inclined along the central direction of the rod.

According to the fourth aspect of the present invention, in the state where the pin and the grommet are nailed, the snapping portion included in the flange portion of the grommet snaps the anti-off claw of the clamping member, and therefore, there is no need to worry about releasing The pinning state allows the three parts to be disassembled. According to the fifth aspect of the present invention, when the shank of the pin is inserted into the cylindrical portion of the grommet, the disengagement prevention pawl of the clamping member supported by the shank of the pin is guided by the tapered shape of the buckle portion, thus Easy to nail operation. According to the sixth aspect of the present invention, in the state where the pin and the grommet are nailed, the detachment prevention claw of the clamp member enters into the recessed space partitioned between the upper wall and the lower wall of the buckle portion, so Specifically, the detachment prevention claw of the clamp member can be securely snapped by the snap portion of the flange portion.

According to the seventh aspect of the present invention, in the state where the detachment prevention claw of the clamping member moves along the inner side direction of the support portion, the detachment prevention claw can pass through the buckle portion included in the flange portion of the grommet, so when the nail When pinning the pin and the grommet, the pin and the grommet can be nailed with a small force, on the contrary, after nailing the pin and the grommet, in the state of moving the detachment prevention claw in the outer direction of the supporting part , the anti-detachment claw cannot pass through the buckle part of the flange part, so even when the rod part of the pin is to be pulled out from the cylindrical part of the grommet, the rod part will not be pulled out from it, so there is no need to worry about the Easily unpin the state.

According to the eighth aspect of the present invention, the rod of the pin is made by inserting the front end of a tool such as a micro screwdriver into the insertion groove separated between the thick-walled upper plate and the thin-walled lower plate included in the head of the pin. The part can be pulled out from the cylindrical part of the grommet, thus facilitating the pulling out operation, and the inwardly guiding support arm of the clamping member and the anti-off claw can be hidden by the thin-walled lower plate, so it is also expected to improve the appearance.

According to the ninth aspect of the present invention, the lower edge of the opening window formed at the cylindrical portion of the grommet approaches to be opposed to the lower surface of the outwardly-guided clamping piece of the clamping member, and therefore, when passing through the outwardly-guided In the state where the clamping piece clamps the object to be fixed, the outwardly guiding clamping piece is supported by opening the lower edge of the window, and a firm clamping force of the outwardly guiding clamping piece can be exerted. According to the tenth aspect of the present invention, when the separate leg member separated from the cylindrical portion of the grommet expands to open outward, the lower edge of the opening window formed at the separate leg member can support the clip. The lower surface of the front end portion of the outwardly leading clamping piece of the clamping member can thus further effectively exert a force supporting the outwardly leading clamping piece.

According to the eleventh aspect of the present invention, a pair of anti-movement walls protrude from both side edges of the accommodating chamber formed at the shank of the pin, so that when the shank of the pin is inserted into the cylindrical portion of the grommet And while supporting the clamping member, there is no concern about pushing the clamping member out of the accommodation chamber in the left-side outward and right-side outward directions, and as a result, the operation of inserting the pin into the grommet can always be smooth carried out.

According to the twelfth aspect of the present invention, when the state of holding the outwardly directed support arm of the clamping member at the support portion formed at the flange portion or cylinder portion of the grommet is achieved, and the shank portion of the pin is inserted When entering the cylindrical part of the grommet, while supporting the clamping member on the inside of the cylindrical part, the pin and the grommet are nailed, and then, when the fastener is inserted into each other of the object to be fixed aligned with each other When connecting in the hole, further, by the operation of the pressing surface of the shank, the shank of the pin is completely pressed into the cylindrical portion of the grommet until the head of the pin contacts the flange portion of the grommet At this time, the outwardly directed clamping piece of the clamping member protrudes from the open window formed at the cylindrical portion of the grommet, so that the object to be fixed is clamped on the grommet made of synthetic resin from the inside and the outside. Between the flange portion of the ring and the outward clamping piece of the clamping member made of metal, and compared with the configuration of the background art, the object to be fixed can be firmly fixed with a larger clamping force.

According to the thirteenth aspect of the present invention, when the pin is pulled, when the outwardly leading clamping piece of the clamping member is accommodated in the receiving chamber formed at the shank of the pin, the clamping member moves along the elastic bending-eliminating The direction is elastically restored, and the outwardly guided clamping piece enters automatically along the inward direction from the open window formed at the cylindrical part of the grommet, so that the force of pulling out the pin can be reduced, and when passing through the disengagement When the grommet releases the fixed state of the object to be fixed to be separated from each other, it can prevent the clamping member from being snapped by the connecting hole of the object to be fixed.

According to the fourteenth aspect of the present invention, the outwardly leading support arm of the clamping member is held in the groove-shaped support groove on the side face of the grommet, so it is expected to form a firm holding state, and it is easy to provide clamping. Elastic bending of tight members. According to the fifteenth aspect of the present invention, by being guided by the groove shape of the support groove to press the outwardly directed support arm of the clamp member only from above, the protruding portion of the support groove and the outwardly guided The groove portions of the support arms cooperate with each other, so that a firm holding state of the clamping member can be further formed, and when the pin is pulled, it is difficult to disengage the clamping member.

According to the sixteenth aspect of the present invention, with respect to the relationship of the outwardly leading support arm of the clamp member being pivotally held by the support portion of the grommet, even when it is difficult to achieve elastic bending or elastic recovery, in view of the structure, the clamp The tightening members themselves may be formed from highly rigid sheet metal, thus providing a fastener with stronger clamping force. According to the seventeenth, eighteenth and nineteenth aspects of the present invention, the pivotal movement of the clamp member can be effectively facilitated.

Description of drawings

These and other objects and advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:

Figure 1 is an exploded perspective view showing a fastener according to an embodiment of the present invention;

2A is a front view of the pin, FIG. 2B is a sectional view taken along the A-A line of FIG. 1 , and FIG. 2C is a sectional view taken along the B-B line of FIG. 1;

Fig. 3A is a plan view of the grommet, Fig. 3B is a sectional view taken along line C-C of Fig. 1 , and Fig. 3C is a sectional view taken along line D-D of Fig. 1;

Figure 4 is a sectional view taken along line E-E of Figure 1, showing the clamping member;

Fig. 5 is a front view showing a state in which a pair of clamping members are supported at the shank of the pin;

Fig. 6 is a sectional view showing a state in which the pin is nailed together with the clamping member on the grommet;

7 is a cross-sectional view showing a state in which a trim panel and a body panel are fixed together in an overlapping state by using fasteners;

Figure 8 is a perspective view showing only the pins provided for the fastener according to the second embodiment of the present invention;

Fig. 9 is a perspective view showing a state of a pair of clamping members supporting the shank of the pin;

Fig. 10 is a perspective view showing a modified example of the pin according to the second embodiment;

11 is an exploded perspective view showing a fastener according to a third embodiment of the present invention;

Figure 12 is a sectional view taken along line A-A of Figure 11, showing the pin;

13A is a sectional view taken along line B-B of FIG. 11 showing the grommet, and FIG. 13B is a sectional view taken along line C-C of FIG. 11;

Figure 14 is a sectional view taken along line D-D of Figure 11, showing the clamping member;

Fig. 15 is a sectional view showing a state in which a pair of clamping members are held in a cylindrical portion of the grommet;

Fig. 16 is a sectional view showing a state in which the pin is pinned on the grommet;

17 is a sectional view showing a state in which a trim panel and a vehicle body panel are fixed together in an overlapping state by using a fastener according to a third embodiment;

18 is an enlarged sectional view of main parts showing a fastener according to a fourth embodiment of the present invention; and

19A is an enlarged sectional view of main parts showing a first modified example of the fourth embodiment, and FIG. 19B is an enlarged perspective view of main parts showing another modified example thereof.

Detailed ways

According to the present invention, the fastener itself is composed of three parts, namely, a pin made of synthetic resin, a grommet made of synthetic resin, and a clamping member made of metal, and when fixing an object to be fixed , by means of the flange portion of the grommet made of synthetic resin and the outwardly directed clamping tabs of the clamping member made of metal, the object to be fixed is clamped more firmly than prior art fasteners , so that the object to be fixed can be fixed.

Example 1

The present invention will be described based on the following preferred embodiment. Unlike the fastener of the prior art, as shown in FIG. 1, the fastener according to this embodiment includes three parts, namely, a pin made of synthetic resin 1. A grommet 11 made of synthetic resin and a clamp member 21 made of metal, and characterized in that each part 1, 11, 21 adopts the following structure. In addition, for clamp members made of metal, the clamp members 21 are used in a paired relationship.

Therefore, firstly, a pin 1 made of synthetic resin will be described, and as also shown in FIGS. It includes a thick-walled upper plate 2a and a thin-walled lower plate 2b, and is separated by a ring-shaped insertion groove 2c so that the front end of the tool is inserted between the upper plate 2a and the lower plate 2b, and the rear rod 3 member Consisting of a structure in which support grooves 4 are formed on one side of the upper side opposite to each other, and they constitute directions for slidably supporting the clamping member 21 described later in the axial direction. The four parts of the support part of the support arm of the inner guide are formed with two pressing surfaces 5 on each side opposite to each other on the other side, and are used for clamping the outward guide of the clamping member 21 described later. Tightening piece 24 presses outwards, and is formed with two receiving cavities 6 from the middle part side that is continuous with corresponding pressing surface 5, is used for accommodating the side of the clamping piece 24 that guides outwards of clamping member 21, to along The direction of the center of the rod 3 is guided. In addition, for the corresponding supporting groove 4, a structure is also adopted in which the lower end side thereof is formed with an engaging edge 4a for engaging with the inwardly leading supporting arm 22 of the clamping member 21 to droop, and these The joint edge 4 a forms a continuous inclined surface along the inwardly directed support arms 22 of the inclined clamping member 21 .

In addition, a structure is also formed in which the lower side of the rod portion 3 is formed with an annular large-diameter groove 7 for engaging with a split leg 17 of the grommet 11 described later, and is formed with a passing taper surface. 8 is an annular small-diameter groove 9 continuous from the large-diameter groove 7, and a guide protrusion 10 of a constricted shape hangs from its front end portion, so that the shank 3 of the pin 1 is smoothly inserted into the grommet described later In the cylindrical part 13 of 11.

Next, as also shown in FIGS. 3A to 3C, a grommet 11 made of synthetic resin is provided with a disc-shaped flange portion 12 and a cylindrical barrel portion 13, and is constructed in such a structure that the front A flange part 12 member is formed with an opening 14 communicating with the hollow area of the cylindrical part at its central part, and a pair of snap parts 15 are formed on the outer periphery opposite thereto for snapping a clip described later. The anti-off pawl 23 of the tight member 21, and each buckle portion 15 includes a continuous upper wall 15a along the circumferential direction, a lower wall 15b extending in the diametrical direction below the upper wall 15a in part, and a partition between the upper wall 15a. and the recessed space 15c between the lower wall 15b. In addition, the upper surface of the upper wall 15a continuous in the circumferential direction is surely provided with a tapered shape of a later-described detachment prevention claw 23 for guiding the clamp member.

In addition, the latter cylindrical portion 13 member is constituted as a structure in which its peripheral wall is divided into four divided leg members 17 by slits 16 in the axial direction, and among the four divided leg members 17 , on one side, the separate legs 17 facing each other are individually formed with opening windows 18 for placing the front end portion of the outwardly guiding clamping piece 24 of the clamping member 21 inside and outside, and from its upper end The inner surface of the corresponding parting leg 17 whose edge reaches the opening window 18 is formed with a recessed groove 19 for allowing the front end of the outward clamping piece 24 of the moving clamping member 21, the four parts of the parting leg 17 The inner surface on the front end side is formed with expansion projections 20 , as described above, for engaging with the large diameter groove 7 and the small diameter member 9 of the shank 3 of the pin 1 .

Finally, a pair of clamping members 21 made of metal are used symmetrically along the left-right direction, and also constitute a structure as shown in FIG. The inwardly leading support arm 22 of bifurcated shape, it is folded to be bent inwardly, and its side opposite to this inwardly guiding supporting arm 22 is formed with outwardly leading anti-off claws 23, and the lower end of the main body 21a The edges are formed with outwardly directed gripping tabs 24 that are folded to bend outwardly. In addition, as described above, the inner surface of the front end of the bifurcated-shaped inwardly directed support arm 22 is provided with a raised portion 22 a facing the inner side of the support groove 4 of the pin 1 .

In addition, according to the pair of clamping members 21, when the bifurcated-shaped inwardly guided support arm 22 is supported by the support groove 4 of the pin 1 corresponding thereto, the inwardly guided support arm 22 moves along the support groove 4. The inner and outer directions of the support groove 4 are movably supported while hanging down from the joint edge 4a of the support groove 4. In the state where the inwardly guided support arm 22 moves along the inner direction of the support groove 4, the anti-off of the clamping member 21 The pawl 23 is set to be able to pass through the snap portion 15 of the grommet 11, on the contrary, in the state where the inwardly guided support arm 22 moves along the outside direction of the support groove 4, the anti-off pawl 23 is set to be unable to Pass through the snap portion 15 of the grommet 11 .

Therefore, when it is assumed that the trim panel P1 constituting the interior part of the automobile is now fixed to the predetermined body panel P2 by using a fastener having such a structure, first of all, when the inward guide of the bifurcated shape of the corresponding clamping member 21 When the support arm 22 of the pin 1 engages with the support groove 4 formed at the shank 3 of the pin 1 from the outside, the corresponding clamping member 21 moves downwards to come into contact with the engagement edge 4a, while being supported by the inwardly directed support as described above. The arm 22 slides, the joint edge 4a of the support groove 4 is constituted by a downwardly leading continuous inclined surface, so that, as shown in FIG. It is supported in the accommodation chamber 6 of the corresponding rod part 3 in the state of being tilted along the central direction of the rod part 3 at the same time.

Therefore, even when the shank 3 of the pin 1 is inserted into the cylindrical portion 13 of the grommet 11 , this does not hinder the presence of the clamp member 21 . However, although the front end portion of the outwardly leading clamping piece 24 of the corresponding clamping member 21 protrudes more or less outwardly from the outer peripheral surface of the rod portion 3 in its size, when the cylindrical portion 13 is inserted , the protrusion of the outwardly directed clamping tab 24 is absorbed by the above-mentioned recessed groove 19 of the corresponding parting leg 17 and therefore does not pose a problem.

Therefore, the shank 3 of the pin 1 is then inserted into the cylindrical portion 13 of the grommet 11 while tilting the pair of clamping members 21, and in this case, the outward direction of the clamping members 21 is made while inserting. When the leading end portion of the clamping piece 24 protrudes more or less outwardly and these recessed grooves 19 coincide with each other, the anti-off pawl 23 of the corresponding clamping member 21 is along the inner side at the lower end portion of the supporting groove 4 . directional movement, while being guided on the side of the grommet 11 by utilizing the conical shape of the upper wall 15a constituting the hasp portion 15, so as shown in FIG. Smoothly passes through the upper wall 15a, and at the same time, the guide protrusion 10 of the pin 1 protrudes outward from the front end edge of the cylindrical portion 13 to temporarily pin the pin 1 and the grommet 11.

In addition, in this case, as shown, the expansion projections 20 of the corresponding divided legs 17 of the cylindrical portion 13 engage with the small-diameter grooves 9 of the stem 3, so that the corresponding divided legs 7 remain There is no expansion opening, and the outwardly directed clamping tabs 24 of the corresponding clamping members 21 do not protrude outwards from their corresponding opening windows 18 , but enter completely into the cylindrical portion 13 of the grommet 11 .

In addition, by making the guide protrusion 10 contact the front end edge of the cylindrical portion 13, the pin 1 is temporarily prevented from being disengaged, and in addition, on the side where the detachment prevention pawl 23 of the clamping member 21 passes through the snap portion 15 Behind the wall 15a, the inwardly directed support arm 22 of the corresponding clamping member 21 moves in the outer direction at the lower end portion of the support groove 4 of the inclined face of the joint edge 4a of the support groove 4, the corresponding clamping member 21 The anti-off claw 23 enters into the recessed space 15c separated between the upper wall 15a and the lower wall 15b, thereby preventing the pin 1 from being disengaged, and the three components 1, 11, 21 are not worried about being disengaged accidentally. .

Therefore, after the pin 1 and the grommet 11 are nailed, when the trim panel P1 is overlapped with the body panel P2, the cylindrical portion 13 of the grommet 11 is inserted into the corresponding mounting holes H1, H1, and 11 aligned with each other. In H2, in addition, the shank 3 of the pin 1 is fully pushed into the cylindrical portion 13 of the grommet 11 until the head 2 of the pin 1 comes into contact with the flange portion 12 of the grommet 11, in which case the The side faces of the outwardly guiding clamping tabs 24 of the corresponding clamping member 21 inside the receiving chamber 6 of the rod 3 are pressed by the pressure surface 5 of the rod 3 and the outwardly guiding of the corresponding clamping member 21 The clamping pieces 24 of the grommet 11 protrude outwardly from the open windows 18 formed at the respective separate leg parts 17 opposite to each other, so that, as shown in FIG. 7, the trim panel P1 and the body panel P2 are clamped by Between the flange portion 12 of the grommet 11 made of synthetic resin and the outwardly directed clamping piece 24 of the clamping member 21 made of metal, and these two members P1, P2 are made of synthetic resin and metal Securely overlap and fix under the applied strong clamping force. Therefore, the reliability of the fixed state is further improved.

Furthermore, in the fixed state, as shown, by pushing the pin 1, in this case the expansion projections 20 of the respective separate legs 17 engage with the large diameter groove 7 formed at the shank 3 of the pin 1 to The expansion opens outwards, so that the trim panel P1 and the body panel P2 can be sandwiched by also expanding the corresponding split leg 17 . Thus, the firmness can be enhanced especially on the sides where there is no clamping member 21 made of metal, the split leg 27 which does not form the opening window 18 is indeed clamping-related, so that a uniformity is achieved over its entire circumference. clamping force.

In addition, by making the outwardly leading clamping piece 24 of the clamping member 21 protrude outward from the open window 18 of the split leg 17, the lower edge of the corresponding window is close to the lower edge of the outwardly leading clamping piece 24. The surfaces are opposite, in which case the lower edge of the opening window 18 formed at the split leg 17 can support the outward guidance of the clamping member 21 when the split leg 17 corresponding thereto expands to open outward. The lower surface of the front end portion of the clamping piece 24 thus effectively exerts a force supporting the outwardly leading clamping piece 24, and the outwardly leading clamping piece 24 made of metal is not bent.

Conversely, when the state of fixing the trim panel P1 and the body panel P2 is released as desired, when the front end of a tool such as a flathead screwdriver (not shown) is inserted into the insertion groove spaced at the side of the head 2 of the pin 1 2c, and when the stem portion 3 of the pin 1 is pulled up to the above nailed state from the cylindrical portion 13 of the grommet 11, it has been pressed by the pressing surface 5 formed at the stem portion 3 of the pin 1. The side of the outwardly leading clamping piece 24 of the clamping member 21 is accommodated again into the accommodation chamber 6 of the rod portion 3 , and the front end portion of the outwardly leading clamping piece 24 enters the cylindrical portion 13 of the grommet 11 Therefore, after realizing this state, when the inwardly guiding support arms 22 of the pair of clamping members 21 move in the inner direction at the inner side of the support groove 4, the corresponding anti-off claws 23 can pass through The upper wall 15a of the hasp portion 15, so that when the shank 3 of the pin 1 together with the clamping member 21 is completely pulled out from the cylindrical portion 13 of the grommet 11, the shank 3 of the pin 1 can pass through the smaller The force is pulled out of the cylindrical portion 13 of the grommet 11 without unnecessary deformation of the pin 1 , the grommet 11 and the clamping member 21 . Therefore, the fastener can be sufficiently reused.

Example 2

The fastener of the second embodiment is explained below, although the structure of the second embodiment basically follows the structure of the above-mentioned first embodiment, the difference between the two lies in the structure in which from the shank 3 of the pin 1 A pair of anti-movement walls 30 in a state parallel to each other protrude integrally from both side edges of the two accommodating chambers 6 formed on the side, on the sides of the support groove 4 of the lower plate 2b constituting the head 2 of the pin 1 The peripheral edge existing on the top is cut by a notch 31 , and a protruding stripe 32 parallel to the edge of the notch 31 is provided on the upper plate 2 a at a position directly above the edge of the notch 31 .

Therefore, according to the second embodiment, by the presence of the aforementioned pair of movement preventing walls 30, when the clamping member 21 is supported by the stem portion 3 of the pin 1 and inserted into the cylindrical portion 13 of the grommet 11, as shown in FIG. As shown, the clamping member 21 is no longer extruded from the accommodation chamber 6 in the left and right directions, so the insertion operation can always be smoothly performed. In addition, although the pair of anti-movement walls 30 protrudes therefrom by being displaced in the up-and-down direction with respect to the mold structure, the present invention is not limited thereto, but as shown in FIG. The entire area of the two side edges of the accommodating chamber protrudes integrally.

In addition, by forming the above-mentioned cutout 31 at the lower plate 2b, the front end of a tool such as a slotted screwdriver can be easily inserted into the lower surface of the upper plate 2a, so that the pin 1 can be easily pulled out from the cylindrical portion 13 of the grommet 11, especially In this case, the notch 31 is formed on the side of the support groove 4 by avoiding the clamping member 21, so that when the pin 1 is pulled out, the clamping member 21 can also be prevented from being damaged by a tool such as a flat-head screwdriver. Damaged front end.

In addition, by forming the protruding stripes 32 parallel to the edges of the cutouts 31 on the upper plate 2a, as described above, when inserting the tip of a tool such as a flathead screwdriver, the tip of the tool can be inserted to a depth directly below the protruding stripes 32. part, whereby the front end of the tool can be inserted into the deepest part without interfering with the clamping member 21 so as to be damaged, therefore, by using the tool as a lever, it can be pulled out more easily with a smaller force pin 1. In addition, although according to the second embodiment, as shown in FIGS. 8 and 9, protruding stripes 32 are provided as markings in operation, the present invention is not limited thereto. As shown in FIG. 10, the markings may be constituted by concave stripes 33, The mark may be a mark provided at a position corresponding to the edge of the cutout 31 on the upper plate 2 a, in addition to the protruding stripes 32 and the concave stripes 33 . Other structures, operations, and effects are similar to those of the first embodiment, and thus their descriptions will be omitted.

Example 3

Next, the present invention will be described in detail according to a preferred embodiment. Different from the fastener of the background art, as shown in FIG. 11, the fastener of this embodiment includes three parts: a pin 101 made of synthetic resin, The grommet 111 made of synthetic resin, and the clamp member 121 made of metal are characterized in that the following structures are adopted for the respective parts 101 , 111 and 121 . In addition, as for the clamp member made of metal, the clamp member 121 is formed of a low-rigidity elastic metal plate and used in pairs.

Therefore, first, the explanation starts from a pin 101 made of synthetic resin, as shown in FIG. The member is constituted as a structure in which a pair of pressing surfaces 104 are formed on opposite side surfaces of its upper portion for applying pressure to the outwardly guiding clamping piece 123 of the clamping member 121, as will be described later. A pair of accommodating chambers 105 are formed in each continuous middle portion of the pressurizing surface 104, for accommodating the sides of the outwardly guiding clamping piece 123 of the clamping member 121 to guide along the central direction of the rod portion 103, and the lower portion of the rod portion 103 An annular large-diameter groove 106 is formed for engaging with a separate leg 117 of the grommet 111, as will be described later, at the lower portion of each receiving chamber 105, formed with The large-diameter groove 106 is continuous with the annular small-diameter groove 107, and the constricted front end portion 103a hangs down from its lower portion.

Referring also to FIGS. 13A and 13B , a grommet 111 made of synthetic resin is provided with a disc-shaped flange portion 112 and a cylindrical cylindrical portion 113, and the former flange portion 112 is constituted as a structure in which The central part is formed with an opening 114 communicating with the inner hole of the cylindrical part 113 at its central part, and its outer peripheral parts opposite to each other are formed with a concave-shaped support groove 115, which constitutes an outward direction for holding the clamping member. The supporting portion of the guided supporting arm 122 is described later, and the bottom surface of each supporting groove 115 is respectively formed with a pin-shaped protruding portion 15a, which fits in the groove portion 122a of the outwardly guiding supporting arm 122, As described later.

In addition, the latter cylindrical portion 113 member is constituted as a structure in which its peripheral wall is equally divided into four divided leg members 117 in the axial direction by slits 116, and among the four divided leg members 117, A pair of separate legs 117 corresponding to each support groove 115 is formed with an opening window 118 for placing outwardly directed clamping tabs 123 of the clamping member inside and outside, accessible from its upper end edge. The inner surface of each divided leg 117 that opens the window 118 is formed with a mounting groove 119 for installing the main body 121a of the clamping member 121, as will be described later, on the lower end side of the four divided legs 117. The inner surface of the pin 101 is integrally formed with an expansion protrusion 120 for engaging with a large-diameter groove 106 and a small-diameter groove 107 formed at the shank 103 of the pin 101, as described later.

Finally, clamping members 121 made of metal are used symmetrically in pairs along the left-right direction, as shown in FIG. The arm, which is folded at a constant inclination angle to bend outward, and the center portion of the outwardly guided support arm 122 is formed with a slit-like groove portion 122a, which is in contact with the support groove 115 at the grommet 111. Fitted with the formed protruding portion 115a, the lower end edge of the main body 121a is formed with an outwardly leading clamping piece 123, which is folded to bend outwardly at a right angle.

In addition, according to the pair of clamping members 121, when the outwardly guided support arm 122 inclined at its upper portion is supported by the corresponding grommet 111 by fitting the protruding portion 115a and the groove portion 122a, When the support groove 115 of the grommet 111 is held, the side of the clamping piece 123 leading outward is held at the inner side of the cylindrical portion 113 of the grommet 111 by forming an inclined state. In this state, when the clamping member 121 is held by When the pressing surface 104 of the pin 101 is pressed outward, elastic bending occurs at the clamping member 121, and when the outwardly guiding clamping piece 123 of the clamping member 121 is pressed by the accommodation chamber formed at the rod portion 103 of the pin 101 When 105 is received, the outwardly directed clamping tabs 123 of the clamping member 121 are arranged to enter through the opening window 118 formed at the cylindrical portion 113 of the grommet 111 by elastically recovering in a direction eliminating elastic bending.

Therefore, assuming now that when the trim panel P11 constituting the interior of the vehicle is fixed to a predetermined body panel P12 using a fastener having such a structure, first, when the clamping members corresponding to the paired support grooves 115 are When each outwardly directed support arm 122 of grommet 121 is pushed into a pair of support grooves 115 formed at flange portion 112 of grommet 111 from above, it fits by forming protrusion portion 115a and groove portion 122a. state, each outwardly guiding support arm 122 of the clamping member 121 is held in the supporting groove 115, in this case, as described above, the outwardly guiding supporting arm 122 is folded to a constant angle of inclination Bending from the upper end edge of the main body 121a, whereby as shown in FIG. The shape is slanted.

Then, when the shank 103 of the pin 101 is inserted into the cylindrical portion 113 of the grommet 111 from the side of its front end portion 103a, as shown in FIG. The front edge of portion 113 protrudes outwardly, and pin 101 and grommet 111 are temporarily pinned. In addition, in this nailed state, the outwardly leading clamping piece 123 of each clamping member 121 is accommodated in the accommodation chamber 105 of the rod portion 103, and therefore, the outwardly leading clamping piece 123 enters the guard hole. The cylindrical portion 113 of the ring 111 does not protrude outward from the corresponding opening window 118 . In addition, the expansion protrusion 120 of each divided leg 117 of the cylindrical portion 113 is engaged with the small-diameter groove 107 of the stem thereof, so that each divided leg 117 is not expanded to open.

Therefore, after obtaining the nailed state of the pin 101 and the grommet 111, the trim panel P11 is overlapped with the body panel P12, the cylindrical portion 113 of the grommet 111 is inserted into the respective attachment holes H11 and H12 aligned with each other, and , when the shank 103 of the pin 101 is pushed fully into the grommet 111 until the head 102 of the pin 101 comes into contact with the flange portion 112 of the grommet 111, in this case already accommodated in the shank The side faces of the outwardly guiding clamping pieces 123 of each clamping member 121 in the accommodation chamber 105 of 103 are pressed by the pressing surface 104 of the rod portion 103 and accompanied by elastic bending, and the outwardly guiding sides of each clamping member 121 The clamping piece 123 protrudes outwardly from the open window 118 formed at the divided leg 117 of the grommet 111, so that, as shown in FIG. Between the flange portion 112 of the grommet 111 made of resin and the outwardly directed clamping piece 123 of the clamping member 121 made of metal, and these two members P11 and P12 are firmly overlapped to pass through the synthetic resin and the large clamping force exerted by the metal to fix it. According to this embodiment, therefore, the reliability of the fixed state is further promoted.

In addition, in the fixed state, by pressing the pin 101, as shown in the figure, in this case, the expansion protrusions 120 of the four separated legs 117 are in contact with the large diameter groove formed at the shank 103 of the pin 101. The grooves 106 are engaged to expand to open outwardly, and therefore, the divided legs 117 are also opened by expanding to sandwich the trim panel P11 and the body panel P12. Especially in this case, on the sides where there are no clamping members made of metal, expansion to open the separate legs 117 that do not open the window 118 does help clamping, therefore, on its entire perimeter Apply even clamping force.

In addition, by protruding the outwardly leading clamping piece 123 of the clamping member 121 from the opening window 118 of the divided leg 117, the lower edge of the opening window 118 is close to opposing the lower surface of the outwardly leading clamping piece 123. , in this case, when the corresponding separate leg 117 expands to open outward, the lower edge of the opening window 118 formed at the separate leg 117 can support the outwardly leading clamping piece The lower surface of the front end portion of 123, therefore, can effectively exert a force supporting the outwardly leading clamping piece 123, and the outwardly leading clamping piece 123 made of metal will not bend.

On the contrary, when it is necessary to release the fixed state of the trim panel P11 and the body panel P12, when the front end of a tool (not shown) such as a flathead screwdriver is inserted into the protrusion formed by the head 102 of the pin 101 and the grommet 111 In the space separated by the edge portion 112, while the stem portion 103 of the pin 101 is pulled up from the cylindrical portion 113 of the grommet 111 to the above-mentioned nailed state, the pressurization formed at the stem portion 103 of the pin 101 has been received. The side surface of the clamping piece 123 of the corresponding clamping member 121 pressed by the surface 104 elastically recovers in the direction of eliminating the elastic bending and is automatically accommodated in the receiving chamber 105 of the corresponding rod 103 , Therefore, the front end portion of the clamping piece 123 directed outward enters into the cylindrical portion 113 of the grommet 111 .

Therefore, after realizing this state, when the shank 103 of the pin 101 is completely pulled out from the cylindrical portion 113 of the grommet 111, the shank 103 of the pin 101 can be pulled out of the grommet with a small force. 111 without deforming the pin 101 and the grommet 111 and without deforming the clamping member 121, so that the fastener itself is sufficient for reuse.

Example 4

Next, a fastener according to a fourth embodiment will be described, although the above-mentioned third embodiment adopts a structure in which clamping The outwardly leading clamping piece 123 of the member 121 is automatically accommodated in the receiving chamber 105 formed at the shank 103 of the pin 101, but this fourth embodiment is constituted as a structure in which the clamping member 121 is formed by Made of a high rigidity metal plate, and the outwardly directed support arms 122 of the clamping members 121 are pivotally held at support portions on the sides of the grommet 111 .

The structure will now be described in detail. As shown in FIG. 18, the outwardly guiding support arm 122 of the clamping member 121 is configured as a hook in the shape of an arc, and the flange portion 112 of the grommet 111 is formed with a snap hole. 131 , for snapping the hook-shaped outwardly guiding support arm 122 and pivotally supporting the outwardly guiding supporting arm 122 of the clamping member 121 through the fulcrum constituted by the hook-shaped lower surface.

Therefore, according to this fourth embodiment, in the state where the trim panel P11 and the body panel P12 are unfixed, when the shaft portion 103 of the pin 101 is pulled up from the cylindrical portion 113 of the grommet 111 to the nailed state, A situation arises in which the outwardly leading clamping piece 123 of the clamping member 121 is not automatically accommodated in the receiving chamber 105, but when the shank 103 of the pin 101 is removed from the cylindrical portion 113 of the grommet 111 When fully pulled out, it does not constitute a hindrance, so the outwardly guiding clamping piece 123 of the clamping member 121 can be easily pivoted to enter along the inner direction of the cylindrical portion 113. When the grommet 111 is pulled out from the corresponding mounting hole of the body panel P12 , there is no need to worry about unnecessary deformation of the outwardly leading clamping piece of the clamping member 121 . Besides, according to this fourth embodiment, the clamping member 121 itself can be formed of a high-rigidity metal plate, and therefore, compared with the third embodiment, it is possible to provide a fastener with a stronger clamping force. advantage.

In addition, as a modified example of the fourth embodiment, when the outwardly guiding support arm 122 of the clamping member 121 is formed in a flat plate shape as shown in FIG. When the inclined base 132 of the support arm 122 is formed at the flange portion 112 of the grommet 111, a similar effect can be achieved, and the space 133 for allowing the outwardly guided support arm to pivot is at the upper portion of the inclined base 132 or on the contrary, a space 134 for allowing the outwardly guided support arm 122 to pivot is spaced at the lower surface of the head 102 of the pin 101 as shown in FIG. 19B .

The fastener according to the present invention is particularly preferable when fixing an interior or exterior part of an automobile or the like to a predetermined body panel, because it can be securely secured by utilizing a strong clamping force obtained by a clamping member made of metal. Fix the object to be fixed.

Claims (19)

1. A fastener comprising: Pins made of synthetic resin; grommets made of synthetic resin; and Clamping members made of metal, in which: said pin includes a head and a shank; The grommet includes a flange portion and a barrel portion; The clamping member comprises an inwardly directed support arm and an outwardly directed clamping tab; The pin header consists of: a support portion for slidably supporting an inwardly directed support arm of the clamping member in an axial direction; an accommodating chamber for accommodating the sides of the outwardly directed clamping pieces of the clamping member to be guided along the central direction of the stem; and A pressing surface for pressing outwardly the outwardly directed gripping tabs of the gripping member at the shank of the pin and forming an opening window for fitting the gripping member at the cylindrical portion of the grommet the outwardly directed clamping tabs are positioned both internally and externally; and The object to be fixed is clamped by the flange portion of the grommet made of synthetic resin and the outwardly directed clamping tabs of the clamping member made of metal projecting outward from the opening window. 2. The fastener of claim 1, wherein: a support portion formed at the shank of said pin includes an engagement edge for engaging with an inwardly directed support arm of the clamping member so as to hang down at its lower end; and The clamping member is housed in a housing chamber formed at the shank of the pin in a drooping state. 3. The fastener of claim 2, wherein: The supporting portion comprises an engaging edge forming an inclined surface along the inwardly directed supporting arm of the inclined clamping member. 4. The fastener of claim 1, wherein: the clamping member includes an outwardly directed detent pawl on a side thereof opposite the inwardly directed support arm; and The flange portion of the grommet includes a buckle portion for buckling the anti-off claw. 5. The fastener of claim 4, wherein: The upper surface of the buckle portion included in the flange portion of the grommet is formed in a tapered shape. 6. The fastener of claim 4, wherein: The flange portion of the grommet includes a hasp portion comprising an upper wall and a lower wall, wherein the upper surface of the upper wall is formed into the tapered shape and the lower wall extends diametrically on the lower side of the upper wall ;and The detachment prevention pawl of the clamping member enters into a recessed space spaced between the upper wall and the lower wall. 7. The fastener of claim 4, wherein: The inwardly directed support arm of the clamping member is movable at least at the lower end region of the support part formed at the shank of the pin along the inner and outer directions of the support part; In the state of moving the inwardly guided support arm along the inner side of the support portion, the anti-off claw of the clamping member can pass through the buckle portion; and In a state in which the inwardly guided support arm is moved in the outer direction of the support portion, the detachment prevention pawl of the clamp member cannot pass through the buckle portion. 8. The fastener of claim 1, wherein: the head of the pin comprises a thick-walled upper plate and a thin-walled lower plate; and A slot for inserting a tool is spaced between said upper and lower plates. 9. The fastener of claim 1, wherein: A lower edge of an opening window formed at a cylindrical portion of the grommet is approximately opposite a lower surface of an outwardly directed clamping tab of the clamping member. 10. The fastener of claim 1, wherein: The clamping member includes a pair of clamping members; the cylindrical portion of the grommet is divided into two or more separate legs by a plurality of slits; In said divided legs, the divided legs facing each other on one side are formed with open windows for placing the outwardly directed clamping tabs of the respective clamping members inside and outside; and The separate legs are formed with expansion projections which engage the shank of the pin on its inner surface to be pressed outwardly. 11. The fastener of claim 1, wherein: A pair of movement preventing walls protrudes from both side edges of the accommodation chamber formed at the shank of the pin. 12. A fastener comprising: Pins made of synthetic resin; grommets made of synthetic resin; and Clamping members made of metal, in which: said pin includes a head and a shank; The grommet includes a flange portion and a barrel portion; The clamping member includes an outwardly directed support arm and an outwardly directed clamping tab; The pin is formed with an accommodating cavity for accommodating one side of an outwardly directed clamping piece of the clamping member to guide along the central direction of the rod, and a pressurizing surface for accommodating The outwardly leading clamping tabs of the clamping member are pressed outwards at the shank; the flange portion or the cylindrical portion of the grommet is formed with a support portion for retaining the outwardly directed support arms of the clamping member; said cylindrical portion is formed with opening windows for positioning the outwardly directed clamping tabs of the clamping member inside and out; and The object to be fixed is clamped by the flange portion of the grommet made of synthetic resin and the outwardly directed clamping tabs of the clamping member made of metal projecting outward from the opening window. 13. The fastener of claim 12, wherein: an elastic bend is formed at the clamping member when a pressing surface formed at the shank of the pin presses outwardly the outwardly directed clamping tabs of the clamping member; and When the outwardly leading clamping piece of the clamping member is accommodated by the receiving chamber formed at the shank of the pin, the clamping member elastically returns along the direction of eliminating the elastic bending, and the outwardly guiding clip of the clamping member The tab enters through an open window formed at the cylindrical portion of the grommet. 14. The fastener of claim 13, wherein: the flange portion of the grommet is formed with a concave support groove extending from its inner bore in the increased diameter portion; and The outwardly directed support arms of the clamping members are held by support grooves. 15. The fastener of claim 14, wherein: the support groove is provided with an overhang; and The outwardly directed support arm of the clamping member is provided with a recess for cooperating with the protrusion. 16. The fastener of claim 12, wherein: The outwardly directed support arms of the clamping member are pivotally retained by the support portion of the grommet. 17. The fastener of claim 16, wherein: The outwardly leading support arms of the clamping member are designed as arcuate hooks and are pivotally held by a fulcrum formed by the inner side of the hook. 18. The fastener of claim 16, wherein: The sides of the flange portion of the grommet are separated by a space for allowing the outwardly directed support arms of the clamping members to pivot. 19. The fastener of claim 16, wherein: The sides of the head of the pin are separated by a space for allowing the pivoting of the outwardly directed support arm of the clamping member.

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