JP5968715B2 - Fastener - Google Patents

Description

  The present invention relates to a fastener that is locked to an attachment target by inserting a leg portion into an attachment hole formed in the attachment target.

  Conventionally, when a door trim is attached to a body panel of an automobile, a fastener integrally molded with a thermoplastic synthetic resin having elasticity and rigidity, such as polyacetal, is used as disclosed in Patent Document 1, for example.

  The fastener of patent document 1 is provided with the head part attached to a door trim, and the leg part inserted in the attachment hole of a body panel. The door trim is formed with a fitting portion having a small diameter portion and a large diameter portion, and the head portion is formed at a cylindrical inner fitting portion fitted into the small diameter portion of the fitting portion, and at the upper end of the inner fitting portion. And an upper collar part that can be inserted into the large-diameter part of the fitting part, and a lower collar part that is formed at the lower end of the inner fitting part and is larger than the large-diameter part of the fitting part.

  The shaft part that constitutes the leg part is a tapered columnar body having a radial cross section in the plane direction orthogonal to the insertion direction, and is composed of four ribs extending along the insertion direction from the lower surface of the lower flange part. And is formed in a shape that is inserted into the mounting hole of the body panel. And between the pair of ribs adjacent to each other, a locking leg constituting a leg portion is disposed.

  The locking leg has a beam shape including a proximal end portion connected to the lower flange portion and a distal end portion connected to one of the pair of ribs. The locking leg has an overhanging portion that is pressed against the edge of the mounting hole when the leg portion is inserted between the distal end portion and the proximal end portion.

  In the fastener having such a configuration, the leg portion is inserted into the attachment hole of the body panel with the head portion attached to the door trim. At this time, the locking legs are elastically deformed so as to approach each other when the overhanging portion is pressed against the edge of the mounting hole. When the fastener is further inserted into the mounting hole, the locking leg is further elastically deformed and the maximum projecting portion passes through the edge of the mounting hole. Then, the locking leg returns to the state before insertion by the restoring force accompanying the elastic deformation. Thereby, since the maximum overhang | projection part is arrange | positioned on the opposite side of the door trim with respect to a body panel, a body panel and a door trim are hold | maintained in a connection state.

JP 2002-303309 A

  By the way, in the fastener mentioned above, in order to improve the assembly property of the door trim with respect to a body panel, it is desired to reduce the insertion force which is a force required when inserting a leg part in an attachment hole.

  The technique of this indication aims at providing the fastener which can reduce the insertion force to an attachment hole.

One aspect of the fastener in the present disclosure is a fastener including a leg portion that is connected to the head and is locked to the attachment target by being inserted into an attachment hole formed in the attachment target. The leg portion includes a plurality of ribs extending in the insertion direction from the head and inserted into the mounting hole, and a locking leg having a beam shape extending in the insertion direction, and is orthogonal to the insertion direction. The plurality of ribs are connected to each other in the surface direction to form a central portion extending in the insertion direction, and the locking leg is pressed against the edge of the mounting hole when inserted into the mounting hole An overhanging portion having a surface , and a locking portion matched to a hole diameter on the head side of the overhanging portion, and disposed between a pair of ribs adjacent to each other in a circumferential direction with respect to the insertion direction, coupled to one of said pair of ribs in the insertion direction of the distal end side, the insertion direction of the base Are connected by the basal end connecting portion to at least the one of the ribs in one of the head and the one of the ribs on the side, connecting portions at the proximal end side, it does not overlap with the projecting portion in the insertion direction And the base end connecting portion is orthogonal to the extending direction of the one rib in the surface direction. It has a plate shape extending in the direction, and has a thickness smaller than the distance between the one rib in the surface direction and the overhanging portion.

  According to one aspect of the fastener of the present disclosure, the locking leg can be elastically deformed in the center direction in the surface direction orthogonal to the insertion direction when inserted into the attachment hole, and in the insertion direction. Compared to the case where the overhanging portion and the connecting portion on the proximal end side overlap, the connecting portion is disposed at a position away from the overhanging portion, so that the connecting portion on the distal end side and the proximal end side are It becomes easy to elastically deform in the circumferential direction with respect to the insertion direction with the connecting portion as a support point. That is, the degree of freedom regarding the elastic deformation of the locking leg at the time of insertion is increased. As a result, the insertion force is reduced because the locking leg easily follows the shape of the insertion hole.

Moreover, according to the said structure , the connection part in the front end side and the connection part in the base end side are located in a line along the insertion direction. As a result, the locking leg is easily elastically deformed in the circumferential direction with respect to the insertion direction.

Moreover, according to the said structure, it is compared with the case where the connection part in the base end side has comprised the shape extended in the extension direction of said one rib on the assumption that the connection area with respect to a head is the same , for example. Since the rigidity of the locking leg in the circumferential direction relative to the insertion direction is reduced, the locking leg is easily elastically deformed in the circumferential direction with respect to the insertion direction.

Moreover, according to the said structure, compared with the case where this connection part is extended in the direction which inclines with respect to the extension direction of one rib, if the dimension of an orthogonal cross section is the same, a locking leg will be It becomes easy to elastically deform in the circumferential direction with respect to the insertion direction.

In another aspect of the fastener according to the present disclosure, the locking leg is connected to both the head and the one rib by the proximal end connecting portion .
According to another aspect of the fastener in the present disclosure, since the locking leg is connected to both the head and one of the ribs, the rigidity of the locking leg in the circumferential direction with respect to the insertion direction can be appropriately adjusted. The adjustment range of the mechanical strength of the connecting portion on the base end side of the locking leg is widened.

  In another aspect of the fastener according to the present disclosure, the projecting portion includes a side surface extending toward the center portion in a cross section in the surface direction, and a connection surface that chamfers between the side surface and the pressed surface. .

  Here, when the side surface and the pressed surface are directly connected, the corner formed by the side surface and the pressed surface becomes sharp, so that the tip of the corner becomes the opening edge of the mounting hole when the fastener is inserted. A greater insertion force is required because the fastener is not smoothly inserted due to being caught or the tip of the corner is deformed. In this respect, according to another aspect of the fastener in the present disclosure, the sharpening of the corner is suppressed compared to the case where the side surface and the pressed surface are directly connected to each other. However, even if the corner contacts the opening edge of the mounting hole, deformation of the corner can be suppressed. As a result, the insertion force is reduced.

It is a side view showing the side structure of the fastener in this indication, and is a figure showing the state where the door trim and the body panel are held in the connected state by the fastener. Sectional drawing which shows the cross-section of the leg part in the AA of FIG.

Hereinafter, an embodiment embodying the fastener according to the present disclosure will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the fastener 10 is integrally formed of a thermoplastic synthetic resin having elasticity and rigidity such as polyacetal. The fastener 10 is a portion that is inserted from the door trim 1 side into the head 20 that is inserted into the insertion portion 2 formed in the door trim 1 and the mounting hole 4 that is formed in the body panel 3 to be attached. And a leg 30 extending from the head 20 in the insertion direction.

  The head 20 has a substantially cylindrical shape extending in the insertion direction of the fastener 10, and includes an inner fitting portion 21 that is fitted into the fitting portion 2 of the door trim 1. A disc shape is formed at the upper end of the inner fitting portion 21. An upper collar portion 22 is formed, and a lower collar portion 23 having a disk shape larger in diameter than the upper collar portion 22 and larger in diameter than the mounting hole 4 is formed at the lower end of the inner fitting portion 21. Has been. And the leg part 30 is integrally formed in the lower surface 24 of the lower side collar part 23. FIG.

  As shown in FIG. 1 and FIG. 2, the shaft portion 31 constituting the leg portion 30 is a tapered column body having a radial cross section perpendicular to the insertion direction, and the lower surface of the lower flange portion 23. The four ribs 32 extend in the insertion direction and are connected to each other. In the cross section in the plane direction, the shaft portion 31 extends in the radial direction from the center portion C, and each rib 32 is disposed every 90 °, and the four ribs 32 are connected to each other in the center portion C. The tip of each rib 32 is formed on a virtual circle 33 having a center. Further, the shaft portion 31 is formed so that the diameter of the virtual circle 33 is smaller than the diameter of the mounting hole 4, and is formed in a size that is inserted into the mounting hole 4 in the insertion direction. . Further, between the pair of ribs 32 adjacent to each other in the circumferential direction with respect to the insertion direction (hereinafter simply referred to as the circumferential direction), a locking leg 35 constituting the leg portion 30 is disposed.

  The locking leg 35 is connected to a connecting rib 32A which is one of a pair of ribs 32 sandwiching the locking leg 35 on the distal end side in the insertion direction, and the lower flange 23 on the proximal end side in the insertion direction. And it has the shape of a beam connected to the connecting rib 32A by the base end connecting portion 36. The distal end portion 37 of the locking leg 35 is a portion disposed inside the virtual circle 33 formed by the shaft portion 31. Further, the base end portion 38 of the locking leg 35 is also a portion disposed inside the virtual circle 33 formed by the shaft portion 31. The locking leg 35 includes an overhanging portion 39 extending in the insertion direction so as to be bridged between the distal end portion 37 and the proximal end portion 38.

  In the cross section of the leg portion 30 in the surface direction, the overhanging portion 39 extends in the extending direction of the connecting rib 32A and faces the connecting rib 32A, and extends in the extending direction of the rib 32 to the rib 32. And an opposing surface 41 facing each other. These facing surfaces 40 and 41 are side surfaces extending in a direction crossing each other so as to face the central portion C of the shaft portion 31 in the surface direction. In other words, one facing surface has the other facing surface as a reference surface. It is a surface that determines the width of the protruding portion 39 in the circumferential direction. The overhanging portion 39 has an arcuate shape in the cross section of the leg portion 30 in the surface direction, a pressed surface 42 disposed outside the virtual circle 33 formed by the shaft portion 31, an opposing surface 40, and a pressed surface 42. And a connecting surface 43 for chamfering. The projecting portion 39 is formed so that the arc drawn by the pressed surface 42 is smaller than the radius of the mounting hole 4 in the cross section in the surface direction, and has a maximum projecting portion 39 a on the proximal end side of the locking leg 35. The locking leg 35 is formed with a locking portion 44 that matches the hole diameter of the mounting hole 4 by the phase difference between the base end portion 38 and the maximum projecting portion 39a.

  The leg 30 has the maximum thickness t1 of the connecting rib 32A, the distance L4 between the connecting rib 32A and the facing surface 40, the thickness t2 of the rib 32, and the distance L5 between the rib 32 and the facing surface 41, which are equal. It is formed as follows.

  In addition, the fastener 10 includes a seal portion 50 in addition to the head portion 20 and the leg portion 30. The seal portion 50 is connected to the vicinity of the connecting portion between the head portion 20 and the leg portion 30 and has a cylindrical shape surrounding the base end portion of the leg portion 30, and the diameter of the seal portion 50 is gradually increased in the insertion direction. The tip is formed with a larger diameter than the mounting hole 4 of the body panel 3. When the fastener 10 is attached to the body panel 3, the seal portion 50 is pressed against the head 20 side by the body panel 3, thereby sealing a gap between the body panel 3 and the fastener 10. Thereby, the fluid circulation through the gap between the seal portion 50 and the body panel 3 is suppressed.

Next, the proximal end connecting portion 36 formed on the proximal end side of the locking leg 35 will be described in detail with reference to FIGS. 1 and 2.
As shown in FIG. 1 and FIG. 2, the base end connecting portion 36 is a portion that connects the locking leg 35 to the head 20 and the connecting rib 32 </ b> A on the base end side of the locking leg 35. The proximal end connecting portion 36 has a plate shape having a thickness t extending in a direction orthogonal to the extending direction of the connecting rib 32A in the surface direction. The connecting portion 36A with respect to the connecting rib 32A has a rectangular shape whose orthogonal cross section extends in the insertion direction, and has a connection length L1 in the insertion direction. Further, the connecting portion 36B with respect to the head 20 has a rectangular shape whose orthogonal cross section extends in a direction orthogonal to the extending direction of the connecting rib 32A in the surface direction, and has a connecting length L2 in the orthogonal direction. ing.

Next, the operation of the fastener 10 having the above-described configuration will be described.
In the fastener 10 having the above-described configuration, when the leg portion 30 is inserted into the attachment hole 4 formed in the body panel 3, the shaft portion 31 and the distal end portion of the locking leg 35 in the insertion direction are inserted into the attachment hole 4. After that, the overhanging portion 39 of the locking leg 35 is eventually pressed against the edge of the mounting hole 4. The locking leg 35 is elastically deformed by being pressed from the edge of the mounting hole 4.

  Here, the locking leg 35 has the distal end side of the locking leg 35 connected to the connecting rib 32A, and the proximal end side of the locking leg 35 is not overlapped with the protruding portion 39 in the insertion direction by the proximal end connecting portion 36. In this manner, the head 20 and the connecting rib 32A are connected. That is, the locking leg 35 is closer to the base end side of the locking leg 35 than the shape in which the connecting portion between the locking leg 35 and the head 20 extends a part of the base end portion 38 in the insertion direction. The support point is disposed on the connecting rib 32A side. Therefore, the locking leg 35 can be elastically deformed toward the central portion C side of the shaft portion 31 in the surface direction, and the connecting portion on the distal end side and the connecting portion on the proximal end side of the locking leg 35. As a support point, elastic deformation easily occurs in the circumferential direction with respect to the insertion direction. That is, the locking leg 35 has a higher degree of freedom with respect to elastic deformation at the time of insertion, and the locking leg 35 can easily follow the shape of the mounting hole 4, so that when the leg 30 is inserted into the mounting hole 4. The insertion force, which is a necessary force, is reduced.

  The connecting portion 36A has a rectangular shape extending in the insertion direction. Therefore, the locking leg 35 is elastically deformed in the circumferential direction as compared with the case where the connecting portion 36A has a shape extending in the direction intersecting the insertion direction under the assumption that the dimensions of the orthogonal cross sections of the connecting portions are the same. It becomes easy.

  Further, the connecting portion 36B has a rectangular shape extending in a direction intersecting the extending direction of the connecting rib 32A in the surface direction. Therefore, on the assumption that the dimensions of the orthogonal cross-sections of the connecting portions are the same, the locking legs 35 are circumferential in comparison with the case where the connecting portion 36B has a shape extending in the extending direction of the connecting rib 32A in the surface direction. It becomes easy to elastically deform. Moreover, since the connecting portion 36B has a shape extending in a direction perpendicular to the extending direction of the connecting rib 32A, for example, the connecting portion 36B has a shape extending in a direction inclined by 45 ° with respect to the extending direction. Compared to the case, the locking leg 35 is easily elastically deformed in the circumferential direction.

  Further, the locking leg 35 is connected to both the head 20 and the connecting rib 32A. Therefore, for example, the rigidity of the locking leg 35 in the circumferential direction can be appropriately adjusted as compared with the case where the locking leg 35 is connected only to the head 20. That is, the degree of freedom regarding the adjustment range of the mechanical strength is increased for the connecting portion on the base end portion 38 side of the locking leg 35.

  Further, the locking leg 35 includes a connecting surface 43 that chamfers the facing surface 40 and the pressed surface 42. Further, the connecting surface 43 and the ridge line of the pressed surface 42 are smoothly connected by R. Here, in the locking leg 35, as shown by a two-dot chain line 99 in FIG. 2, when the facing surface 40 and the pressed surface 42 are directly connected without the connecting surface 43, The corner formed by the pressed surface 42 is sharp. Therefore, when the fastener 10 is inserted, the tip of the corner is hooked on the opening edge of the mounting hole 4 so that the fastener 10 is not inserted smoothly or the tip of the corner is deformed. Greater insertion force is required during insertion. In this respect, since the above-described connecting surface 43 is provided, sharpening of the corner is suppressed, so that the tip of the corner is not easily caught by the opening edge of the mounting hole 4 at the time of insertion, and the corner is not attached to the mounting hole 4. Even if it contacts the opening edge, the deformation of the corner is suppressed. As a result, the insertion force can be further reduced.

  When the leg portion 30 is further inserted and the maximum overhanging portion 39a passes through the edge of the mounting hole 4, the locking leg 35 returns to the state before insertion by the restoring force accompanying the elastic deformation, and the body panel 3 is A locking portion 44 is disposed on the opposite side of the door trim 1. Thereby, even if the fastener 10 is about to be pulled out from the body panel 3 via the door trim 1, the engagement portion 44 engages with the body panel 3, so that the door trim 1 and the body panel 3 are connected. Keep connected.

As explained above, according to the fastener 10 of the said embodiment, the effect enumerated below can be acquired.
(1) The locking leg 35 is connected to the head 20 and the connecting rib 32A so as not to overlap the overhanging portion 39 in the insertion direction. As a result, the insertion force is reduced by increasing the degree of freedom regarding the elastic deformation of the locking leg 35.

  (2) The connecting portions 36A and 36B of the base end connecting portion 36 have a shape extending in a direction intersecting the extending direction of the connecting rib 32A in the surface direction. As a result, the locking leg 35 is easily elastically deformed in the circumferential direction.

  (3) Moreover, since each of the connecting portions 36A and 36B has a shape extending in a direction perpendicular to the extending direction of the connecting rib 32A, for example, each of the connecting portions 36A and 36B is in the extending direction. Compared with the case where the shape extends in the direction of 45 °, the locking leg 35 is easily elastically deformed in the circumferential direction.

  (4) Since the latching leg 35 is coupled to both the head 20 and the coupling rib 32A, the degree of freedom regarding the adjustment range of the mechanical strength of the coupling portion on the base end part 38 side of the latching leg 35 is provided. Enhanced.

  (5) The facing surface 40 and the pressed surface 42 are connected by the connecting surface 43. As a result, it is possible to prevent the corner portion of the locking leg 35 from being caught or deformed by the opening edge of the mounting hole 4 at the time of insertion, so that the insertion force can be further reduced.

  (6) The insertion force of the fastener 10 can be adjusted by changing the thickness t, the connecting length L1, the connecting length L2, and the arrangement of the connecting portions 36A and 36B of the base end connecting portion 36. For example, regarding the connecting portion 36B, the insertion force can be adjusted to be relatively small by reducing the connecting length L2 while maintaining the thickness t of the base end connecting portion 36.

  (7) In the leg portion 30, the shaft portion 31 is constituted by four ribs 32 arranged every 90 ° in the surface direction. As a result, the fastener 10 is manufactured because the shape of the mold, the assembly process, and the mold drawing process are simplified as compared with, for example, the leg part in which the shaft part is constituted by the five ribs 32. The manufacturing load when doing so is reduced.

In addition, the said embodiment can also be suitably changed and implemented as follows.
-In the latching leg 35, the connection surface which chamfers between the opposing surface 41 and the to-be-pressed surface 42 may be formed.

-In the latching leg 35, the connection surface 43 may be omitted and the opposing surface 40 and the to-be-pressed surface 42 may be connected directly.
-In the latching leg 35, as for the connection part 36A with the connection rib 32A, the orthogonal cross section is not restricted to a rectangular shape. For example, the connecting portion 36A may have an elliptical shape in which an orthogonal cross section has a long axis extending in the insertion direction. Further, for example, the connecting portion 36A may have a shape that becomes wider as the orthogonal cross section approaches the distal end portion 37, or the orthogonal cross section may have a wave shape or a semi-elliptical shape. Such a configuration is the same for the connecting portion 36B.

  The connecting portion 36A only needs to have a shape in which the orthogonal cross section extends in a direction intersecting the insertion direction, and is not limited to a shape extending in the insertion direction. Similarly, the connecting portion 36B may have a shape whose orthogonal cross section extends in a direction intersecting the extending direction of the connecting rib 32A in the surface direction, and is limited to a shape extending in the direction orthogonal to the extending direction. Absent.

  The locking leg 35 may be connected to at least one of the head 20 and the connecting rib 32A so as not to overlap the overhanging portion 39 in the insertion direction, or may be connected only to the head 20 or the connecting rib. It may be connected only to 32A.

  In addition, the base end connecting portion 36 may be disposed between the locking leg 35 and the rib 32 that is not the connecting rib 32A among the pair of ribs 32 sandwiching the locking leg 35. You may arrange | position between the leg 35 and the center part C of the axial part 31. FIG.

  -The axial part should just be comprised by the at least 1 rib, and is not restricted to the axial part 31 comprised by the four ribs 32. FIG. For example, the shaft portion may be a shaft portion configured by only two connecting ribs 32A among the four ribs 32 in the fastener 10, that is, a shaft portion configured by two ribs connected by the central portion C. It may be a shaft part constituted by three or five or more ribs. Further, for example, it may be a shaft portion constituted by one rod-shaped rib extending so as to overlap the central portion C of the fastener 10.

In addition, a plurality of locking legs may be disposed between a pair of ribs in the circumferential direction.
The fastener 10 may have a configuration in which the seal portion 50 is omitted.
-A fastener is the leg part inserted in the attachment hole of a 2nd member, and the head 20 inserted in the insertion part of a 1st member like the fastener 10 which connects the door trim 1 to the body panel 3. The configuration including 30 is not limited. For example, attachment holes are formed in both the first member and the second member. After the first member and the second member are stacked and the attachment holes are aligned, the first and second members are aligned. It may be a fastener that holds the first member and the second member in a connected state by inserting the leg portion into the mounting hole of the second member. That is, the head portion of the fastener may have a configuration in which the upper flange portion 22 and the inner fitting portion 21 are omitted from the head portion 20 of the fastener 10.

  C ... Center part, 1 ... Door trim, 2 ... Insertion part, 3 ... Body panel, 4 ... Mounting hole, 10 ... Fastener, 20 ... Head part, 21 ... Inner fitting part, 22 ... Upper collar part, 23 ... Lower side鍔 part, 24 ... lower surface, 30 ... leg part, 31 ... shaft part, 32 ... rib, 32A ... connecting rib, 33 ... virtual circle, 35 ... locking leg, 36 ... proximal end connecting part, 36A, 36B ... connecting part , 37 ... distal end part, 38 ... proximal end part, 39 ... overhang part, 39a ... maximum overhang part, 40, 41 ... opposed surface, 42 ... pressed surface, 43 ... coupling surface, 44 ... locking part, 50 ... seal Department.

Claims (3)

A fastener provided with a leg portion connected to the head and locked to the attachment object by insertion into an attachment hole formed in the attachment object,
The legs are
A plurality of ribs extending in the insertion direction from the head and inserted into the mounting hole;
A locking leg in the form of a beam extending in the insertion direction;
Including
The plurality of ribs are connected to each other in a plane direction orthogonal to the insertion direction to form a central portion extending in the insertion direction,
The locking leg is
A projecting portion having a pressed surface that is pressed against an edge of the mounting hole when inserted into the mounting hole;
A locking portion that matches the hole diameter on the head side of the overhang portion , and
Disposed between a pair of ribs adjacent to each other in the circumferential direction with respect to the insertion direction;
Connected to one of the pair of ribs at the distal end side in the insertion direction;
The base end side in the insertion direction is connected to at least one of the head and the one rib by a base end connecting portion ,
The connecting portion on the base end side is disposed at a position that does not overlap the overhanging portion in the insertion direction , and extends in a direction perpendicular to the extending direction of the one rib in the surface direction,
The proximal end connecting portion is
It has a plate shape extending in a direction orthogonal to the extending direction of the one rib in the surface direction, and has a thickness smaller than the distance between the one rib in the surface direction and the protruding portion. And fasteners. The fastener according to claim 1 , wherein the locking leg is connected to both the head and the one rib by the base end connecting portion . The overhanging portion is
A side surface extending toward the central portion in a cross section in the surface direction;
The fastener of claim 1 or 2 and a connecting surface for chamfering between the side surface and the pressed surface.

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