JP2020034024A - Fastener - Google Patents

Abstract

To provide a fastener which achieves improvement of extraction force so as to prevent removal from a mounting hole.SOLUTION: A fastener 10 is fastened to a mounting hole of an attachment member and includes: a pin 22; and a grommet 20 into which the pin 22 may be inserted. The grommet 20 has: a head 24 having an insertion hole into which the pin 22 is inserted; and multiple elastic leg parts 26 which extend from the head 24 and are deflected by insertion of the pin 22 so as to expand and open. The elastic leg part 26 has ribs, each of which is formed protruding further than a reference surface of an outer surface of the elastic leg part 26 on the outer surface and extends in a direction in which the elastic leg part 26 extends.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fastener attached to a mounting hole of a mounting member.

  Patent Literature 1 discloses a two-piece clip including a grommet and a pin. The grommet has an annular flange and a plurality of elastic legs extending from the flange. The elastic leg portion is expanded in diameter by inserting a pin, and a slit extending in the axial direction is formed in the elastic leg portion.

JP 2004-19671 A

  It is preferable that the removal force can be improved so that the fastener attached to the mounting hole does not fall out of the mounting hole.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a fastener having an enhanced withdrawal force so that the fastener does not fall out of the mounting hole.

  In order to solve the above-mentioned problem, one embodiment of the present invention is a fastener fixed to a mounting hole of a mounting member, and includes a pin and a grommet into which the pin can be inserted. The grommet has a head having an insertion hole for inserting a pin, and a plurality of elastic legs that extend from the head and bend so as to expand when the pin is inserted. The elastic leg has a rib protruding from a predetermined reference surface on the outer surface of the elastic leg and formed on the outer surface and extending in a direction in which the elastic leg extends.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a fastener with an increased withdrawal force so as not to fall out of the mounting hole.

It is a perspective view of the fastener of an Example. FIG. 2A is a plan view of the grommet, and FIG. 2B is a side view of the grommet. FIG. 3 is a sectional view taken along line AA of the grommet illustrated in FIG. 4A is a front view of the pin, FIG. 4B is a side view of the pin, and FIG. 4C is a bottom view of the pin. It is sectional drawing of the fastener of the state before attachment. It is a figure for explaining the attachment method of a fastener. It is the perspective view which looked at the fastener of an attachment state from the back side of the 2nd attachment member. It is sectional drawing of the fastener of an attachment state. It is sectional drawing of the fastener of the state which attached the 1st mounting member from which a board thickness differs to the 2nd mounting member.

  FIG. 1 is a perspective view of a fastener 10 according to the embodiment. FIG. 1A is a perspective view of the fastener 10 as viewed from above, and FIG. 1B is a perspective view of the fastener 10 as viewed from below.

  The fastener 10 is used for attaching exterior parts such as a bumper and a cowl to a vehicle body panel. A mounting hole is formed in each of the vehicle body panel and the exterior component, and the fastener 10 is inserted into the mounting hole of the vehicle body panel and the exterior component.

  The vehicle body panel functions as a first mounting member having a first mounting hole, and the exterior component functions as a second mounting member having a second mounting hole. The first mounting member is not limited to the vehicle body panel and may be a component such as a dashboard or a trim panel, and the second mounting member is not limited to the exterior component and may be a vehicle component such as a decorative component.

  The fastener 10 includes a grommet 20 and a pin 22 and is fastened to a mounting hole of a mounting member. The pin 22 is held by the grommet 20 with the pin 22 inserted halfway into the grommet 20 before being attached. The grommet 20 and the pin 22 will be further described with reference to the drawings.

  FIG. 2A is a plan view of the grommet 20, and FIG. 2B is a side view of the grommet 20. FIG. 3 is a sectional view taken along line AA of the grommet 20 shown in FIG.

  The grommet 20 has a head 24, elastic legs 26, and an insertion hole 28. The head 24 is formed in a disk shape and is hooked on the mounting member as a flange.

  The plurality of elastic legs 26 extend from the head 24 and can be bent so as to expand when the pins 22 are inserted. The elastic leg portion 26 expands in the attached state and is locked on the back edge of the attachment hole. The insertion hole 28 is formed in a rectangular shape in the head 24 as shown in FIG.

  The elastic leg 26 has a tip portion 30, a rib 32, a reference surface 34, a concave portion 36, and an inner flat surface 38. The distal end portion 30 is formed so that the inner surface of the elastic leg portion 26 is bent radially inward toward the distal end of the elastic leg portion 26. The distal end portion 30 abuts on the inserted pin 22 to deflect the elastic leg portion 26.

  As shown in FIG. 3, a rib 32, a reference surface 34, and a concave portion 36 are formed on the outer surface of the elastic leg portion 26. The rib 32 protrudes radially outward from the reference surface 34, and the concave portion 36 is concave radially inward from the reference surface 34. The reference surface 34 is a smooth surface on the outer surface of the elastic leg portion 26 where the rib 32 and the concave portion 36 are not formed, and the outer surface of the elastic leg portion 26 located on a virtual cylinder having a predetermined radius from the axial center of the grommet 20. It is.

  FIG. 3 shows a mounting hole of a mounting member coaxial with the axis of the pin 22. The distance L1 between the rib 32 and the mounting hole is larger than the distance L2 between the rib 32 and the mounting hole. This indicates that the projection protrudes radially outward from the reference surface 34.

  The rib 32 extends in the direction in which the elastic leg portion 26 extends, and is configured to hit the edge of the mounting hole even when the thickness of the mounting member changes. The ribs 32 bite into the edges of the mounting holes in the mounted state, making it difficult for the elastic leg portions 26 to come off the latch, thereby suppressing rattling of the fastener 10 in the mounted state. A plurality of ribs 32 are formed on the elastic leg 26 in parallel. A reference surface 34 is formed between the pair of ribs 32.

  A recess 36 is formed between the rib 32 and the reference surface 34. Accordingly, the ribs 32 can be made higher while suppressing the outer diameters of the plurality of reference surfaces 34 from becoming large, and the ribs 32 can be configured to be easily crushed. Further, since the crushed portion of the rib 32 escapes to the concave portion 36, the rib 32 is easily crushed.

  The recesses 36 are formed on both sides of the rib 32 so as to extend along the rib 32. Thereby, the elastic leg portion 26 is easily bent, and the insertion force of the pin 22 can be reduced. The outer surface of the elastic leg portion 26 is formed in the circumferential direction in the order of the reference surface 34, the concave portion 36, the rib 32, the concave portion 36, and the reference surface 34. The surface area of the reference surface 34 is configured to be larger than the surface area of the rib 32. Reference surfaces 34 are formed at both ends in the circumferential direction of the elastic leg 26. This is because the interval between the ribs 32 is widened and only one of the ribs 32 hits the edge of the mounting hole to reduce the possibility of rattling.

  An inner flat surface 38 having a step is formed on the inner surface of the elastic leg portion 26. The inner plane 38 extends substantially perpendicular to the head 24 from the edge of the insertion hole 28 of the head 24 to the tip 30. The inner flat surface 38 hangs down from each side of the rectangular insertion hole 28, and is not curved until reaching the distal end portion 30. By forming the inner flat surface 38, the elastic leg 26 can be easily bent as compared with the case where the inner surface of the elastic leg 26 is curved.

  FIG. 4A is a front view of the pin 22, FIG. 4B is a side view of the pin 22, and FIG. 4C is a bottom view of the pin 22. The pin 22 has a flange portion 40, a shaft portion 42, a first overhang portion 44, and a second overhang portion 45.

  The flange portion 40 is formed in a disk shape. The shaft portion 42 extends from the flange portion 40 and is formed in a rod shape. The tip side of the shaft portion 42 is formed in a tapered portion 50. The first projecting portion 44 and the second projecting portion 45 project radially outward from the shaft portion 42 and are located at equal intervals in the circumferential direction. The first overhanging portion 44 and the second overhanging portion 45 are inserted into gaps between the elastic legs 26.

  The pair of first overhang portions 44 are formed in a wall shape and overhang in opposite directions. A protruding retaining portion 48 is formed at the distal end side of the first overhanging portion 44 and the second overhanging portion 45. The retaining portion 48 restricts the pin 22 from coming out of the insertion hole 28 of the grommet 20.

  The pair of second overhanging portions 45 project in opposite directions to each other, and have a retaining portion 48 on the distal end side. A first elastic piece 46a and a second elastic piece 46b are formed on the second overhanging part 45 so as to be separated in the axial direction. The first elastic piece 46a and the second elastic piece 46b are both-end pieces that can be bent in the radial direction.

  A plurality of shaft-side flat surfaces 49 are formed on the outer surface of the shaft portion 42. A rectangular cross section is formed by the four shaft-side planes 49, and the first overhanging portion 44 and the second overhanging portion 45 project from corners of the adjacent shaft-side planes 49. The tapered portion 50 of the shaft portion 42 has a conical shape and evenly contacts the tip portion 30 to stabilize the expansion of the elastic leg portion 26.

  FIG. 5 is a cross-sectional view of the fastener 10 before being attached. The retaining portion 48 is hooked on the back edge of the insertion hole 28 to restrict the pin 22 from coming off the grommet 20. The second elastic piece 46b is hooked on the front edge of the insertion hole 28, and prevents the pin 22 from moving to the inner side of the insertion hole 28. Since the second elastic piece 46b is bendable, when the pin 22 is strongly pressed, the second elastic piece 46b bends and the pin 22 advances.

  The inner flat surface 38 has a step 39 which is inclined inward halfway near the tip 30. Thereby, the elastic leg 26 can be easily bent at a position above the step 39.

  FIG. 6 is a diagram for explaining a method of attaching the fastener 10. FIG. 6 shows a cross section of the fastener 10 in an attached state. The fastener 10 attaches the first attachment member 12 to the second attachment member 14. The plurality of elastic legs 26 of the grommet 20 are inserted into the first mounting hole 12a of the first mounting member 12 and the second mounting hole 14a of the second mounting member 14.

  When the pin 22 is pushed into the inner side of the insertion hole 28, the tapered portion 50 of the shaft 42 hits the tip 30 of the elastic leg 26 and moves the tip 30 of the elastic leg 26 so as to expand. The leg 26 is bent. As a result, the plurality of elastic legs 26 bend toward the outer diameter side from the second mounting hole 14a and are locked to the back edge of the second mounting hole 14a. Since the elastic leg 26 has the inner flat surface 38, it is easily bent, and the insertion force of the pin 22 can be reduced.

  FIG. 7 is a perspective view of the fastener 10 in the mounted state as viewed from the back side of the second mounting member 14. When the elastic leg 26 is locked to the back edge of the second mounting hole 14a, the rib 32 deforms and bites into contact with the back edge of the second mounting hole 14a.

  The rib 32 bites into the back edge of the second mounting hole 14a while the elastic leg 26 is formed with the inner flat surface 38 and the concave portion 36 so that the elastic leg 26 is easily bent and the insertion force of the pin 22 is reduced. Thus, the elastic legs 26 are configured to be hardly released. Thus, both the reduction of the insertion force of the pin 22 and the sufficient removal force of the fastener 10 can be achieved.

  When the rib 32 is crushed, the reference surface 34 also comes into contact with the back edge of the second mounting hole 14a and is locked. Thereby, the width | variety which engages with the edge of the 2nd mounting hole 14a is ensured sufficiently, and the removal force of the fastener 10 can be improved.

  FIG. 8 is a cross-sectional view of the fastener 10 in an attached state. The plurality of elastic legs 26 are inserted through the first mounting hole 12a and the second mounting hole 14a, are bent so as to expand, and are locked to the back edge of the second mounting hole 14a. The head 24 is hooked on the surface of the first attachment member 12.

  The flange portion 40 of the pin 22 is in contact with the head 24 of the grommet 20, and the first elastic piece 46 a of the pin 22 is hooked on the back edge of the insertion hole 28. Thereby, the movement of the pin 22 in the axial direction is restricted.

  Since the first elastic piece 46a is bendable, the pin 22 can be moved by strongly lifting the pin 22 upward. A gap 52 is formed between the outer periphery of the flange 40 and the surface of the head 24. When a tool or the like is inserted into the gap 52 and the flange 40 is pushed upward, the first elastic piece 46a bends radially inward and the pin 22 moves upward.

  When the pin 22 moves upward, the plurality of elastic legs 26 are restored, the engagement with the second mounting member 14 is released, and the fastener 10 can be removed.

  FIG. 9 is a cross-sectional view of the fastener 10 in a state where the first mounting members 112 having different plate thicknesses are mounted on the second mounting members 14. The first attachment member 112 is thicker than the first attachment member 12 shown in FIG.

  The rib 32 and the concave portion 36 formed on the outer surface of the elastic leg 26 extend in the direction in which the elastic leg 26 extends, and the rib 32 and the second It can bite into the back edge of the mounting hole 14a.

  Although the insertion force of the pin 22 is increased by increasing the plate thickness of the first attachment member 112, the insertion force of the pin 22 is reduced by the concave portion 36 and the inner flat surface 38 in the fastener 10 of the embodiment. , Easy to install.

  The present invention is not limited to the above embodiments, and various modifications such as design changes can be made to each embodiment based on the knowledge of those skilled in the art. The described embodiments can also be included in the scope of the present invention.

  In the embodiment, the mode in which the fastener 10 attaches the first attachment member 12 to the second attachment member 14 has been described, but the invention is not limited to this. For example, the fastener 10 may be attached only to the attachment member to close the attachment hole of the attachment member.

  Further, in the embodiment, a mode in which a plurality of ribs 32 are provided on one elastic leg portion 26 has been described. However, the present invention is not limited to this mode, and three or more or one rib 32 may be provided. When one rib 32 is provided, the rib 32 is provided at the center of the elastic leg 26 in the width direction.

  DESCRIPTION OF SYMBOLS 10 Fastener, 12 1st mounting member, 12a 1st mounting hole, 14 2nd mounting member, 14a 2nd mounting hole, 20 grommet, 22 pin, 24 head, 26 elastic leg, 28 insertion hole, 30 tip , 32 rib, 34 reference surface, 36 concave portion, 38 inner flat surface, 40 flange portion, 42 shaft portion, 44 first overhang portion, 45 second overhang portion, 46a first elastic piece, 46b second elastic piece, 48 Retaining part, 50 taper part, 52 void part.

Claims (5)

A fastener that is fastened to a mounting hole of the mounting member,
idea,
A grommet into which the pin can be inserted,
The grommet is
A head having an insertion hole for inserting the pin,
A plurality of elastic legs extending from the head and flexing so as to expand by inserting the pin,
The fastener according to claim 1, wherein the elastic leg has a rib protruding from a predetermined reference surface on an outer surface of the elastic leg and formed on the outer surface and extending in a direction in which the elastic leg extends.   The fastener according to claim 1, wherein a recess recessed from the reference surface is formed between the rib and the reference surface.   The fastener according to claim 2, wherein the recess is formed to extend along the rib on both sides of the rib.   The fastener according to any one of claims 1 to 3, wherein the rib is formed so as to be crushable by contacting an edge of a mounting hole in a mounted state.   The fastener according to any one of claims 1 to 4, wherein, in the mounted state, the rib and the reference surface abut against and lock the edge of the mounting hole.

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