JPWO2018235692A1 - Fastener - Google Patents

Abstract

Provided is a fastener capable of suppressing deformation of a leg portion and suppressing a reduction in a margin for an attachment hole when forcibly removing the inner shape of the leg portion. A grommet 15 having a head 20 and a bottomed cylindrical leg 30 extending from the head 20, which is a fastener 10 inserted and attached to the attachment hole 3, and inserted into the leg 30. The leg 30 is provided on the outer surface thereof and has at least a pair of locking portions 35, 35 which are locked on the back side peripheral edge of the mounting hole 3. And a pair of engaging projections 40, 40 that can be engaged with each other. The inner surface of the leg 30 has a pair of A pair of first ribs 50, 50 extending in the axial direction are provided at positions not overlapping with the engagement protrusions 40, 40.

Description

  The present invention relates to a fastener that is inserted into a mounting hole and mounted.

  For example, a mounting hole is formed in a vehicle body panel or the like of an automobile, and a fastener (two-piece clip) including a grommet and a pin member may be used when mounting a vehicle component in the mounting hole. In this fastener, the grommet is inserted into the mounting hole, the locking portion formed on the outer periphery of the grommet is engaged with the peripheral edge of the back surface of the mounting hole, and in this state, the pin member is inserted into the grommet, thereby locking the grommet. The diameter of the portion is suppressed from being reduced, so that the fixing force can be improved. In order to prevent the pin member from slipping out of the grommet, an engagement projection with which the pin member is engaged is formed in the grommet. A trim board or the like is mounted on a vehicle body panel or the like using such fasteners.

  Patent Literature 1 below discloses a fastener including a grommet and a pin member, which is provided on a flange portion disposed on a front side of a mounting hole, a leg portion extending from a back surface side of the flange portion, and an outer periphery of the leg portion. There is described a fastener including a grommet having an engagement claw on the back side peripheral edge of the mounting hole, and a pin having a head and a shaft. A pair of engagement portions are provided on the inside of the leg portion of the grommet, and a narrow engagement recess is formed on the outer periphery of the shaft portion of the pin. Then, when the shaft of the pin is inserted into the leg of the grommet, the pair of engagement portions engage with the engagement recesses, and the pin is retained and held by the grommet.

  In forming the grommet as described above, after filling the mold with the molten resin, the mold is removed from the outer periphery or the inner periphery of the leg portion, thereby being molded.

JP 2011-52743 A

  The grommet in the fastener of Patent Document 1 has a pair of engaging portions projecting from the inside of the leg, so that when the pulling pin that forms the inside shape of the leg is pulled out from the leg, the forming pin is In order to be caught by the pair of engaging portions, the legs are removed while being pushed and spread, that is, in a so-called forced removal state.

  However, if the forcible pulling is performed as described above, the deformation of the legs may reduce the amount of engagement of the engaging claws provided on the outer periphery of the legs with the back side periphery of the mounting hole, which is required for the grommet. There is a possibility that a predetermined removal force (a holding force for preventing the removal from the mounting hole) cannot be obtained.

  Therefore, an object of the present invention is to suppress deformation of the leg portion when forcibly removing the inner shape of the leg portion, and to suppress a reduction in the interference of the locking portion with the back side peripheral edge of the mounting hole. It is possible to provide a fastener.

  In order to achieve the above object, the present invention provides a fastener that is inserted and attached to a mounting hole, the head being disposed on the front side of the mounting hole, and a bottomed cylindrical shape extending from the head. And a pin member inserted into the leg portion of the grommet, wherein the leg portion is provided on an outer surface of the grommet and is engaged with a back side peripheral edge of the mounting hole. And a pair of engaging projections provided on the inner surface and engaged with the pin member, and the inner surface of the leg portion, when viewed from the axial direction of the leg portion, A pair of first ribs extending in the axial direction are provided at positions that do not overlap the pair of engagement protrusions with the axis of the leg interposed therebetween.

  According to the fastener of the present invention, when viewed from the axial direction of the leg, the inner surface of the leg extends in the axial direction at a position that does not overlap the pair of engaging protrusions with the axis of the leg interposed therebetween. Since the pair of first ribs is provided, when the pin-shaped mold forming the internal shape of the leg is forcibly removed from the inside of the leg, the pair of engaging protrusions of the leg is provided. Even if the missing portion is deformed, the deformed portion is easily returned to the original shape by the pair of first ribs after the removal of the pin-shaped mold, and the deformation of the leg can be suppressed. As a result, it is possible to suppress a reduction in the margin of at least the pair of locking portions with respect to the back side peripheral edge of the mounting hole.

FIG. 4 is a perspective view of a grommet and a pin member that is inserted into the grommet and held to prevent the grommet from slipping out, showing one embodiment of the fastener according to the present invention. It is a front view of the grommet which comprises the same fastener. FIG. 3 is a cross-sectional view (a cross-sectional view when the leg is viewed from the axial direction) along the line AA in FIG. 2. It is a top view of the grommet. FIG. 5 is a cross-sectional view taken along line BB of FIG. 4. It is sectional drawing in the DD arrow line of FIG. It is sectional drawing which shows the state which attached the attaching member to the to-be-attached member using the same fastener. FIG. 8 is a cross-sectional view showing a state where the attachment member is attached to the attachment member using the fastener, as viewed from a section different from FIG. 7. In molding the grommet, a state is shown in which a pin-shaped mold is forcibly removed from a leg portion, wherein (A) is an explanatory view showing a first state, and (B) is an explanatory view showing a second state. FIG. 3C is an explanatory diagram showing a third state, and FIG. 3D is an explanatory diagram showing a fourth state.

  Hereinafter, an embodiment of a fastener according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the fastener 10 is inserted and mounted in a mounting hole 3 formed in a predetermined member, and includes a head 20 disposed on the front side of the mounting hole 3, A grommet 15 having a bottomed cylindrical leg 30 extending from the portion 20, and a pin member 60 inserted into the leg 30 of the grommet 15 and held by the grommet 15 to be retained. Have. As shown in FIGS. 7 and 8, the fastener 10 of this embodiment is designed to be inserted and mounted in a circular mounting hole 3 formed in the member 1 to be mounted. The mounting member 5 is fixed to the mounted member 1 via the mounting member.

  The attached member 1 includes, for example, a vehicle body panel and a vehicle body frame, and the attaching member 5 includes, for example, electric components such as a trim board, a cover, a garnish, an assist grip, a bumper, a lamp, and an insulator (soundproofing). Material) and the like, but are not limited thereto. In addition, since the grommet 15 constituting the fastener 10 has the bottomed cylindrical leg 30, for example, when attaching an electrical component such as a lamp to a panel in a place where a watertight structure is required, Can be suitably used.

  As shown in FIGS. 7 and 8, the mounting seat 7 of the mounting member 5 has a frame shape in which a locking groove 8 is formed at the bottom thereof, and holds a later-described head 61 of the pin member 60. It is possible. However, for example, a circular insertion hole may be provided in the mounting member 5 and the head 20 of the grommet 15 may be engaged with the front side thereof, and there is no particular limitation. In addition, the fastener of the present invention may be used not only for the above purpose but also for closing the mounting hole (so-called hole plug), and is not particularly limited.

  The “back side of the mounting hole” in the present invention is one side in the thickness direction of the member (here, the member 1 to be mounted) in which the mounting hole is formed, and is defined as the head arrangement side of the grommet 15. Means the other side.

  As shown in FIG. 1, the head 20 in this embodiment has a substantially annular thin flange shape having a circular opening 21 in the center. The shape of the head is not limited to the above-described embodiment, and may be any shape as long as it can be arranged on the front side of the mounting hole formed in the predetermined member. As shown in FIGS. 1, 7 and 8, a cushion member 70 made of a soft material such as sponge is arranged on the back side of the head 20. However, this cushion member 70 is not provided. May be.

  A bottomed cylindrical leg 30 extends from the back side of the head 20. As shown in FIGS. 2, 5, and 6, the leg portion 30 of this embodiment extends from the peripheral edge on the back side of the opening portion 21 of the head portion 20 in a substantially cylindrical shape, and extends in the axial direction ( This means a direction along the axis C of the leg portion 30. The same applies to the following description), and the distal end side is closed by a bottom portion 31 that is rounded in an arc shape. As shown in FIG. 2, the outer surface of the leg portion 30 in the axial direction has a tapered shape that gradually decreases in diameter toward the axial front end side (which means the bottom portion 31 side; the same applies to the following description). A stepped portion 33 is formed, and the distal end side in the axial direction of the leg portion 30 has a smaller diameter than the base end side in the axial direction via the stepped portion 33.

  Further, on the outer surface of the leg portion 30, at least a pair of locking portions 35, 35 which are locked to the back side peripheral edge of the mounting hole 3 are provided. As shown in FIG. 1 and FIG. 2, in this embodiment, the step 33 of the leg 30 is straddled in the axial direction of the leg 30 on the outer surface of the leg 30 and opposed to the circumferential direction. Thus, a pair of locking portions 35, 35 are provided to protrude. As shown in FIG. 2, each locking portion 35 is disposed at a position where a top portion 36 that protrudes highest from the outer surface of the leg portion 30 substantially matches the step portion 33 of the leg portion 30. Further, a tapered surface 37 whose diameter is gradually reduced from the top portion 36 of each locking portion 35 toward the distal end side in the axial direction of the leg portion 30 is formed, and is further opposite to the tapered surface 37 of each locking portion 35. A locking step 38 perpendicular to the axial direction of the leg 30 is formed at the side end.

  In addition, the above-mentioned pair of locking portions may be at least one pair, and may be two or more pairs. Further, the pair of locking portions may not be disposed at locations on the outer surface of the leg portion 30 that are circumferentially opposed. Furthermore, the shape and the position of the locking portion are not limited to the above-described embodiments, and can be appropriately selected according to the thickness and shape of the member to be mounted provided with the mounting hole, the purpose of use of the fastener, and the like. .

  A pair of engaging projections 40, 40 that engage with the pin member 60 are provided on the inner surface of the leg 30. In this embodiment, as shown in FIG. 3, the pair of locking portions 35, 35 and the pair of engaging projections 40, 40 are provided at positions where they do not overlap when viewed from the axial direction of the leg 30. Have been. Specifically, as shown in FIG. 3, when viewed from the axial direction of the leg portion 30, the inner surface of the leg portion 30 is circumferentially opposed so as to be orthogonal to the pair of locking portions 35. A pair of engaging projections 40, 40 are provided at the locations.

  As shown in FIG. 5, each engagement protrusion 40 has a shape projecting from the inner surface of the leg 30 so as to form a substantially mountain shape when viewed from a cross section along the axial direction of the leg 30. ing. Specifically, it has a tip-side slope 42 whose height gradually decreases from the top 41 projecting the highest from the inner surface of the leg 30 toward the tip of the leg 30 in the axial direction. Therefore, the base 30 has a base-side slope 43 whose height gradually decreases toward the base end side in the axial direction of the leg 30. Further, each of the substantially projecting engagement protrusions 40 is formed in an arc shape along the inner circumferential direction of the leg 30 when viewed from the axial direction of the leg 30 as shown in FIGS. In addition to being formed with a predetermined width, both sides in the circumferential direction are shaped such that the inner surface side of the leg portion 30 is wide and gradually narrows toward the axis C of the leg portion 30.

  As shown in FIGS. 5 and 6, the inner surface of the leg 30 on the axial front end side is formed with a pair of engaging projections 40 and gradually has an inner diameter toward the axial front end of the leg 30. A protruding portion 44 that protrudes in the direction is provided. The projecting portion 44 of this embodiment extends from the lowest portion of the tip side slope 42 of each engaging projecting portion 40 and is directed toward the axial tip end of the leg 30 as shown in FIG. As shown in FIG. 6, the leg portion 30 is provided so as to gradually protrude toward the inner diameter direction (the side of the axis C) of the leg portion 30 and gradually become narrower toward the distal end side in the axial direction of the leg portion 30.

  The shape and position of the pair of engagement protrusions are not particularly limited, and may be appropriately selected according to the shape of the pin member 60 retained and held by the grommet and the purpose of use of the grommet. Can be.

  As shown in FIG. 3, a pair of engaging projections 40, 40 is provided on the inner surface of the leg 30 of the grommet 15 with the axis C of the leg 30 interposed therebetween when viewed from the axial direction of the leg 30. A pair of first ribs 50, 50 extending in the axial direction are provided at positions not overlapping with. In addition, the pair of first ribs 50, 50 are provided on the inner surface of the leg 30 corresponding to the positions where at least the pair of locking portions 35, 35 are provided.

  In this embodiment, as shown in FIG. 3, when viewed from the axial direction of the leg 30, the pair of first ribs 50, 50 are aligned with the circumferential central portions of the pair of locking portions 35, 35. It is arranged at a position facing the circumferential direction of the inner surface of the leg portion 30 so as to be positioned. In other words, the pair of first ribs 50, 50 are opposed in the circumferential direction of the inner surface of the leg 30 so as to be orthogonal to the pair of engagement protrusions 40, 40 when viewed from the axial direction of the leg 30. (See FIG. 3).

  Further, as shown in FIGS. 5 and 6, the pair of first ribs 50, 50 extend from the inner peripheral edge of the opening 21 of the head 20 along the thickness direction of the head 20 and the axial direction of the leg 30. The projecting portion has a length extending from the top portion 41 of the engaging projection 40 to the substantially axial center of the projecting portion 44 beyond the top portion 41 and the tip side slope 42.

  In addition, the pair of first ribs is not limited to the above-described location, and a pair of engagement protrusions 40, with the axis C of the leg 30 interposed therebetween when viewed from the axial direction of the leg 30. What is necessary is just to arrange so that it may not overlap with 40, and the shape of a pair of 1st rib is not specifically limited, either.

  As shown in FIG. 6, each of the first ribs 50 is configured such that a portion from the opening 21 of the head 20 to the step portion 33 of the leg 30 projects with respect to a protruding height in a radial direction of the leg 30. The height from the step portion 33 of the leg portion 30 to the axial end thereof in the radial direction of the leg portion 30 is formed small, so that the interval between the pair of first ribs 50 is constant. .

  As further shown in FIG. 3, in the fastener 10 of this embodiment, a pair of engaging projections 40, as viewed in the axial direction of the leg 30, is provided on the inner surface of the leg 30 at the base end in the axial direction. A pair of second ribs 55 is provided at a position overlapping with 40.

  In this embodiment, as shown in FIG. 3, when viewed from the axial direction of the leg 30, the pair of second ribs 55, 55 is aligned with the circumferential center of the pair of engagement protrusions 40, 40. It is disposed at a position facing the circumferential surface of the inner surface of the leg portion 30 so as to be at a position where the leg portion 30 is located. In other words, the pair of second ribs 55, 55 are perpendicular to the pair of locking portions 35, 35 and the pair of first ribs 50, 50 when viewed from the axial direction of the leg 30. It is disposed at a position facing the inner surface of the inner surface 30 in the circumferential direction (see FIG. 3).

  5 and 6, the pair of second ribs 55 extend from the inner peripheral edge of the opening 21 of the head 20 along the thickness direction of the head 20 and the axial direction of the leg 30. The distal end portion in the extension direction is connected to the base-side slope 43 of the engagement protrusion 40.

  In addition, the pair of second ribs is not limited to the above-described location, and is disposed so as to be located at a position overlapping the pair of engagement protrusions 40, 40 when viewed from the axial direction of the leg 30. Just do it. Also, the shape of the pair of second ribs is not particularly limited.

  As shown in FIGS. 1, 2, and 4 to 6, a plurality of protrusions are provided on the front side of the head 20 and from the periphery of the opening 21. In other words, a pair of first protrusions 57, 57 is formed at a location facing the head 20 in the circumferential direction so as to align with the pair of first ribs 50, 50, and from the front edge of the opening 21. The head 20 extends in the outer radial direction, and its base ends are connected to the axial base ends of the pair of first ribs 50, 50, respectively. Further, a pair of second protrusions 59, 59 is formed at a location facing the head 20 in the circumferential direction so as to align with the pair of second ribs 55, 55, and from the front side peripheral edge of the opening 21. The head 20 extends in the outer radial direction, and its base end is connected to the axial base end of the pair of second ribs 55, 55. Each of the first protrusions 57 and each of the second protrusions 59 have a pair of left and right slopes and have a mountain shape with a sharp top, so that they can easily bite into the cushion member 70 disposed on the back side of the head 20. Thus, the rotation and positioning of the cushion member 70 can be achieved. In addition, the pair of first ribs 50, 50 and the pair of second ribs 55, 55 are arranged to be orthogonal to each other when viewed from the axial direction of the leg 30, as shown in FIG.

  Next, the pin member 60 that is inserted into the leg portion 30 of the grommet 15 and is retained and retained will be described. As shown in FIGS. 1, 7, and 8, the pin member 60 includes a head 61 that engages with a frame-shaped mounting seat 7 formed on the mounting member 5, and extends from the back side of the head 61. And a shaft portion 63.

  The head portion 61 has a neck portion 61 a inserted into a locking groove 8 formed at the bottom of the mounting seat 7, and a disk connected to an upper end of the neck portion 61 a and engaged with a front side peripheral edge of the locking groove 8. And a disc-shaped pin flange which is connected to the lower end of the neck 61a, engages with the back side peripheral edge of the locking groove 8, and abuts on the front side of the head 20 of the grommet 15. Portion 61c.

  The shaft portion 63 extends in a columnar shape with a predetermined length from the center on the back side of the pin flange portion 61c, and a concave portion 65 formed in a predetermined shape is formed on the outer periphery in the axial direction. The axial end portion 67 of the shaft portion 63 has an outer periphery that is gradually reduced in diameter toward the axial end, and has a rounded shape at the foremost end. The stop 67a is formed. Then, the pair of engaging projections 40, 40 of the grommet 15 enter the recess 65, and the engaging step 67a of the distal end 67 of the pin member 60 is engaged with the distal slope 42 thereof, The pin member 60 is retained and held in the leg 30 of the grommet 15 (see FIG. 7).

  The shape of the pin member is not particularly limited as long as the pin member is inserted into the grommet leg and engaged with the pair of engaging projections so as to be retained from the grommet leg. .

  The grommet 15 and the pin member 60 having the above configuration can be made of, for example, a polyamide resin such as nylon or a resin material such as polyacetal (POM) or polypropylene (PP). Furthermore, the above resin material may be formed of a fiber reinforced resin reinforced by containing glass fiber, carbon fiber, metal fiber, or the like.

  Next, a description will be given of a method of using the fastener 10 having the above-described configuration, and an effect thereof.

  That is, the neck 61 a of the pin member 60 is inserted into the locking groove 8 of the mounting seat 7 formed on the mounting member 5, and the mounting flange 61 b and the pin flange 61 c are engaged with the front and back peripheral edges of the locking groove 8. Then, as shown in FIGS. 7 and 8, the head 61 of the pin member 60 is mounted on the mounting seat 7.

  Further, the leg portion 30 of the grommet 15 is inserted into the mounting hole 3 formed in the mounted member 1 from the front end side in the axial direction, and the cushion member 70 arranged on the back side of the head 20 is inserted into the mounting hole 3. 3 while being elastically abutted against the front side peripheral edge of the mounting hole 3, the locking step portions 38, 38 of the pair of locking portions 35, 35 of the leg 30 are respectively locked on the rear side peripheral edge of the mounting hole 3, The grommet 15 can be attached to the attachment hole 3 (see FIG. 8).

  Thereafter, the shaft 63 of the pin member 60 is inserted into the leg 30 through the opening 21 of the grommet 15. Then, the pair of engaging projections 40, 40 in the leg 30 enter the concave portion 65 of the pin member 60, and the engagement of the distal end 67 of the pin member 60 with the distal side slope 42 of each engaging projection 40. The stop portion 67a is locked, and the pin flange portion 61c of the pin member 60 abuts on the front side of the head 20 of the grommet 15, and as shown in FIG. The pin member 60 is retained and retained. As a result, as shown in FIGS. 7 and 8, the mounting member 5 can be mounted on the mounted member 1 via the fastener 10 including the grommet 15 and the pin member 60.

  The grommet 15 of this embodiment is formed, for example, as follows. That is, as shown in FIG. 3, the outer peripheral shape of the leg 30 of the grommet 15 and the back side of the outer peripheral shape of the head 20 are mainly separated from each other in a direction orthogonal to the axial direction of the leg 30. Molded by a first mold 81 and a second mold 82 that slide in the direction. As shown in FIG. 5, the front side of the outer peripheral shape of the head 20 of the grommet 15 is formed by a third mold 83 that slides along the axial direction of the leg 30.

  Further, as shown in FIG. 5, a pin-shaped fourth mold 84 that slides along the axial direction of the leg 30 is disposed inside the third mold 83. As shown in FIG. 9A, the fourth mold frame 84 has a shape corresponding to the inner peripheral shape of the leg portion 30 and has a tip portion 85 provided with an enlarged diameter portion 85a. doing. Further, as shown in FIGS. 9A to 9D, the fourth mold 84 slides along the axial direction of the leg 30 after the grommet is formed, and is forcibly removed, so that the grommet 15 is formed. The inner peripheral shapes of the head 20 and the leg 30 are formed.

  When the grommet 15 is molded, the molds 81, 82, and 83 are closed, and the cavity defined in the mold is filled with a molten resin by injection molding or the like. The grommet 15 is formed. Thereafter, the first mold 81 and the second mold 82 are moved so as to be away from each other, and the mold is removed.

  Thereafter, the fourth mold frame 84 in a pin shape is pulled out from the inside of the leg portion 30 while the third mold frame 83 restricts the movement of the head 20 of the grommet 15. At this time, as shown in FIG. 9A, the enlarged diameter portion 85a of the distal end portion 85 of the fourth mold frame 84 is caught on the distal side slopes 42, 42 of the pair of engaging projections 40, 40, and Push out part 30. When the fourth mold 84 is further pulled out, as shown in FIG. 9 (B), the enlarged diameter portion 85a of the distal end portion 85 comes into contact with the top portions 41, 41 of the pair of engagement projections 40, 40. Then, the pair of engaging projections 40, 40 are further pushed and spread. This state is a state where the leg 30 is most deformed.

  When the fourth mold 84 is further pulled out, as shown in FIG. 9 (C), the enlarged diameter portion 85a of the distal end portion 85 exceeds the top portions 41, 41 of the pair of engagement projections 40, 40. The leg 30 which has started elastically gradually starts to return. When the fourth mold 84 is further pulled out, as shown in FIG. 9 (D), the enlarged diameter portion 85a of the distal end portion 85 is no longer caught by the pair of engagement projections 40, 40, and the forced removal state is released. As a result, the leg portion 30 is elastically restored to its original shape.

  As described above, when the fourth mold 84 is pulled out from the inside of the leg 30, the distal end 85 of the fourth mold 84 is caught by the pair of engaging projections 40, 40, and the forcibly removed state is obtained. However, at this time, the portion of the leg 30 where the pair of engaging protrusions 40 and 40 are provided is deformed so as to spread outward, while the pair of engaging protrusions 40 and 40 of the leg 30 is deformed. The portion where the 40 is not provided tends to be deformed so as to be depressed inward.

  However, in this fastener 10, as shown in FIG. 3, a pair of inner surfaces of the legs 30 of the grommet 15 sandwich the axis C of the legs 30 when viewed from the axial direction of the legs 30. Since the pair of first ribs 50, 50 extending in the axial direction are provided at positions not overlapping with the engagement projections 40, 40, the fourth mold 84 cannot be forced from the inside of the leg 30 as described above. Even when a portion of the leg portion 30 where the pair of engagement protrusions 40, 40 is not provided is deformed, the fourth mold 84 is removed from the mold, that is, the state shown in FIG. When this happens, the pair of first ribs 50, 50 makes it easier for the deformed portion to return to its original shape, and it is possible to suppress deformation of the leg 30. As a result, it is possible to suppress a reduction in the margin of the pair of locking portions 35, 35 with respect to the peripheral edge on the back side of the mounting hole 3, and to remove the fastener 10 from the mounting hole 3 by a predetermined removal force (from the mounting hole). It can be firmly mounted so that a retaining force for preventing it from coming off can be obtained.

  In this embodiment, as shown in FIG. 3, the inner surface of the leg 30 on the axially proximal end side is located at a position overlapping the pair of engagement protrusions 40 when viewed from the axial direction of the leg 30. , A pair of second ribs 55, 55 are provided. Therefore, when the pin-shaped fourth mold frame 84 is forcibly pulled out from the inside of the leg portion 30, even if the portion where the pair of engaging protrusions 40, 40 of the leg portion 30 is provided is deformed, the fourth After the mold 84 is removed, the deformed portion can be easily returned to the original shape by the pair of second ribs 55, 55, and the engagement of the pair of locking portions 35, 35 with the peripheral edge on the back side of the mounting hole 3 is performed. The margin can be sufficiently secured. In addition, it is necessary to secure a sufficient margin between the engaging projection 40 and the pin member 60 (here, the margin of the locking step 67a of the pin member 60 with respect to the tip side slope 42 of the engaging projection 40). As a result, the retaining force of the pin member 60 against the leg portion 30 of the grommet 15 can be increased.

  Further, in this embodiment, as shown in FIG. 3, the pair of locking portions 35, 35 and the pair of engaging projections 40, 40 are located at positions where they do not overlap when viewed from the axial direction of the leg 30. Is provided. Therefore, when the pin-shaped fourth mold 84 is forcibly removed from the inside of the leg 30, the leg 30 can be easily deformed, and the fourth mold 84 can be easily removed. The deformed portion of the leg 30 can be easily returned to the original shape by the pair of first ribs 50, 50 and the pair of second ribs 55, 55. As a result, the deformation of the leg 30 is more effectively achieved. It is possible to more sufficiently secure the interference between the pair of locking portions 35, 35 with respect to the peripheral edge on the back side of the mounting hole 3.

  Further, in this embodiment, as shown in FIG. 3, the pair of first ribs 50, 50 are provided on the inner surface of the leg 30 corresponding to the positions where at least the pair of locking portions 35, 35 are provided. As a result, the strength of the pair of locking portions 35, 35 can be increased, and the locking force of the pair of locking portions 35, 35 with respect to the back side peripheral edge of the mounting hole 3 is increased, thereby improving the removal force. be able to.

  Further, in this embodiment, as shown in FIGS. 5 and 6, the inner surface of the leg portion 30 on the axially distal end side is connected to the pair of engagement projections 40 and the axially distal end of the leg portion 30. A protruding portion 44 is provided, which gradually protrudes in the radial direction toward the side. By providing such a protruding portion 44, the outer circumference of the distal end portion 85 of the pin-shaped fourth mold 84 is reduced in diameter by the amount of the protruding portion 44. When it is forcibly removed from the pair, the tip portion 85 is less likely to be caught by the pair of engagement protrusions 40, 40, and the fourth mold 84 can be smoothly removed from the inside of the leg portion 30. In addition, the strength of the inner surface of the leg 30 at the tip end in the axial direction can be increased by the protrusion 44, and when the fourth mold 84 is forcibly pulled out from the inside of the leg 30, the excessive force of the leg 30 can be obtained. Deformation can be suppressed.

  In this embodiment, as shown in FIG. 1 and FIG. 2, the leg portion 30 is formed such that the axial distal end side is an axial base end via a step portion 33 provided on an outer surface halfway in the axial direction. Since the diameter is smaller than that of the side, the leg 30 can be easily inserted into the mounting hole 3 from the front end in the axial direction. In addition, since the pair of locking portions 35 are provided on the outer surface of the leg 30 so as to straddle the step portion 33 in the axial direction of the leg 30, the diameter of the leg 30 is reduced. It is possible to further increase the locking force of the pair of locking portions 35, 35 on the back side peripheral edge of the mounting hole 3 and further improve the removal force.

  Note that the present invention is not limited to the above-described embodiments, and various modified embodiments are possible within the scope of the present invention, and such embodiments are also included in the scope of the present invention. .

3 Mounting Hole 10 Fastener 15 Grommet 20 Head 21 Opening 30 Leg 35, 35 Locking Portion 40, 40 Engagement Projection 44 Projection 50, 50 First Rib 55, 55 Second Rib 60 Pin Member 70 Cushion Element

Claims (6)

A fastener that is inserted into the mounting hole and mounted,
A grommet having a head disposed on the front side of the mounting hole, and a bottomed cylindrical leg extending from the head;
A pin member inserted into the leg portion of the grommet,
The leg portion has at least a pair of locking portions provided on an outer surface thereof and locked on a back side peripheral edge of the mounting hole, and a pair of engaging protrusions provided on an inner surface and engaging with the pin member. And
A pair of first ribs extending in the axial direction are provided on the inner surface of the leg portion so as not to overlap with the pair of engagement protrusions with the axis of the leg portion interposed therebetween when viewed from the axial direction of the leg portion. A fastener characterized by being provided with.   2. A pair of second ribs is provided on an inner surface of the leg portion on the base end side in the axial direction, at a position overlapping the pair of engagement protrusions when viewed from the axial direction of the leg portion. Fasteners.   The fastener according to claim 1, wherein at least the pair of locking portions and the pair of engaging protrusions are provided at positions where they do not overlap when viewed from the axial direction of the leg portion.   The fastener according to any one of claims 1 to 3, wherein the pair of first ribs is provided on an inner surface of the leg portion at least at a position where the pair of locking portions is provided.   The inner surface of the leg portion on the axial front end side is provided with a protrusion that is gradually continuous with the pair of engaging protrusions and that protrudes in the inner diameter direction toward the axial end of the leg portion. The fastener according to any one of claims 1 to 4. The leg portion has a shape in which the distal end in the axial direction is smaller in diameter than the proximal end in the axial direction via a step provided on the outer surface in the middle in the axial direction,
The fastener according to any one of claims 1 to 5, wherein at least the pair of locking portions are provided on an outer surface of the leg portion so as to straddle the step portion in an axial direction of the leg portion. .

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