JP2018031422A - rivet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rivet whose extraction force is hard to decrease even if it is repeatedly used.SOLUTION: A rivet R comprises a sleeve 20 and a core member 10. The sleeve 20 is provided with several turning pieces 30 through a hinge part 27. A base end side end surface 33 of each of the turning pieces 30 is provided with a turning side protrusion 34. The core member 10 is provided with a pressing part 15 for turning the turning pieces 30 outward when it is inserted into the sleeve 20. A peripheral surface of the pressing part 15 is provided with several core member side protrusions 16. The core member 10 is constituted in such a way that it can be turned relatively in respect to the sleeve 20 between a non-engaged position under a state in which it is inserted into the sleeve 20 to cause the turning pieces 30 to be turned outward where the core member side protrusions 16 do not oppositely face against the base end side end surfaces 33 of the turning pieces 30 and an engaged position where the core member side protrusions 16 oppositely face against the base end side end surfaces 33 and the core member side protrusions 16 are engaged with the turning side protrusion 34.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rivet that can be operated from one side.

  Conventionally, a rivet disclosed in Patent Document 1 is known as a rivet that can be operated from one side. The rivet of Patent Document 1 includes a sleeve having a flange and a core material inserted into the sleeve, and the sleeve is inserted from one side into a mounting hole provided in a laminated sheet formed by laminating a plurality of sheets. Then, the laminated sheet is fixed by inserting a core material into the sleeve from one side.

  Specifically, a turning piece is provided at the tip of the sleeve via a thin hinge portion. A fixed protrusion is provided on the end surface on the base end side of the swivel piece. The core member is provided with a return portion that protrudes radially outward. Then, by inserting the core material into the sleeve, the swivel piece is pressed by the core material and swivels outward, and the return portion of the core material swivels over the fixed protrusion of the swivel piece swung outward. The piece is fixed at the swiveled position.

Japanese Patent Laying-Open No. 2015-206417

  By the way, when the rivet of Patent Document 1 is used once and then repeatedly, the removal force tends to be lower than that at the time of initial use, and is not suitable for repeated use. That is, in the rivet of Patent Document 1, when the swiveling piece is fixed at the position swung outward at the time of attachment, the return portion of the core material passes through the process of getting over the fixed protrusion of the swiveling piece swung outward. . At that time, the turning piece is pushed outward, and a load in the extending direction acts on the thin hinge portion connecting the turning piece. Therefore, the hinge portion is extended by repeatedly performing the attaching operation, and as a result, the rivet removal force is reduced.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rivet in which the removal force does not easily decrease even when used repeatedly.

  A rivet for achieving the above object includes a sleeve having a flange and a core member inserted into the sleeve, and the sleeve is provided with a plurality of swiveling pieces via a hinge portion. By inserting the core material, the swivel piece is a rivet that is pressed by the core material and swivels outward, and a swivel-side protrusion is provided on a base end side end surface of the swivel piece, The core member is provided with a pressing portion that presses the turning-side protruding portion of the turning piece to turn the turning piece outward when inserted into the sleeve, and the outer surface of the pressing portion turns outward. A plurality of core material side protrusions projecting radially outward from the tip of the swivel side protrusion of the swivel piece are provided at intervals in the circumferential direction, and the core material is inserted into the sleeve. In a state where the swivel piece is swung outward, the A non-engaging position where the core-side protrusion does not face the proximal end surface of the turning piece, and the core-side protrusion faces the proximal end surface of the swiveling piece, It is configured to be rotatable relative to the sleeve between the engagement position where the core-side protrusion is engaged.

  In the above configuration, in the circumferential direction of the pressing portion of the core material, the core material side projection is positioned between the portion having a long radial length and the adjacent core material side projection, and the radial direction There is a part with a short length. The core member and the sleeve are configured to be relatively rotatable. Therefore, the rivet can be fixed by the following method. First, the circumferential position of the portion having a short radial direction length in the pressing portion is matched with the position where the swiveling piece is provided in the sleeve, the core member is inserted into the sleeve, and the swiveling piece is swung outward. The pressing part is inserted inside the revolving piece that has revolved. Next, the core material is rotated relative to the sleeve. Specifically, from the non-engagement position where the core material side protrusion does not face the proximal end surface of the swivel piece, the core material side protrusion is formed on the proximal end surface. Are rotated relative to the opposing engagement positions.

  In this case, at the timing when the pressing portion enters the inside of the turning piece that has turned outward, the portion of the pressing portion that faces the base end side end surface of the turning piece has a short radial length. Therefore, it becomes difficult for the pressing portion and the turning-side protruding portion of the turning piece to interfere with each other, and the turning piece is pushed outward and the hinge portion is prevented from being extended. Then, after the core material is relatively rotated to the engagement position with respect to the sleeve, the core material side protrusion, that is, the core material side protrusion in the pressing portion is provided, and the portion having a long radial length is the turning piece. By engaging with the turning-side protrusion, it is possible to secure a sufficient catch between the core material and the turning piece for regulating the withdrawal of the core material from the sleeve.

  Thus, according to the said structure, it can be set as the state by which the turning piece was turned outside, and the withdrawal of the core material from a sleeve were controlled, without applying a big load to a hinge part. Therefore, even when it is used once after being used once, it is possible to prevent the rivet removal force from being reduced due to deterioration of the hinge portion.

  In the rivet, the radial length from the insertion axis in the portion where the core-side protrusion in the pressing portion is not provided is from the tip of the turning-side protrusion of the turning piece swung outward to the insertion axis. It is preferable that the length is equal to or shorter than the distance.

  In this case, it is possible to avoid strongly pressing the turning piece outward at the timing when the pressing portion enters the inside of the turning piece turning outward. Therefore, deterioration of the hinge part at the time of attachment can be suppressed more effectively.

  In the rivet, the core member side protrusion is provided so as to be close to or abut on a base end side end surface of the swiveling piece that is turned outward when the core member is in the engagement position. It is preferable that the distal end surface of the part and the proximal end side end surface of the swivel piece are formed as curved surfaces along a circle centered on the insertion axis.

  In this case, the turning to the inside of the turning piece from the state of turning to the outside can be effectively restricted. Further, when the core material is relatively rotated from the non-engagement position to the engagement position, the core material side projection and the base end side end surface interfere with each other, and a load in the twist direction is prevented from acting on the hinge portion. The

  According to the rivet of the present invention, it is possible to suppress a decrease in extraction force when repeatedly used.

Side view of rivets. (A) is a perspective view which shows the front end side of a core material, (b) is a perspective view which shows the base end side of a core material. (A) is a perspective view which shows the front end side of a sleeve, (b) is a front view which shows the base end side of a sleeve, (c) is a fragmentary sectional view of a sleeve. The end view which shows the 1st process of fixing a laminated material with a rivet. The end view which shows the 2nd process which fixes a laminated material with a rivet. (A) is an end view showing a third process of fixing the laminated material with rivets, and (b) is a front view showing the tip side of the rivet in the third process. (A) is an end view showing a fourth process of fixing a laminated material with rivets, and (b) is a front view showing the leading end side of the rivet in the fourth process. (A), (b) is a perspective view of the laminated material fixed by the rivet.

Hereinafter, an embodiment of a rivet of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rivet R of the present embodiment includes a core material 10 and a sleeve 20 into which the core material 10 is inserted. The core material 10 and the sleeve 20 are each integrally formed of synthetic resin. Examples of the synthetic resin that forms the core material 10 and the sleeve 20 include polypropylene, polyamide, and polyacetal.

  As shown in FIGS. 2A and 2B, the core member 10 includes a disk-shaped base portion 11 and a columnar shaft portion 12 that is erected on the inner surface side of the base portion 11. A first operation portion 11 a that protrudes radially outward is provided on the outer peripheral surface of the base portion 11.

  A disc-shaped pressing portion 15 is provided at the tip of the shaft portion 12. A plurality of core side protrusions 16 projecting outward in the radial direction are provided on the circumferential surface of the pressing portion 15 at intervals in the circumferential direction. Therefore, in the circumferential direction, the pressing member 15 is positioned between the core member side protrusion 16 and a portion having a long radial length from the center line L1 and the adjacent core member side protrusion 16. Thus, there are alternating portions with a short radial length from the center line L1. In this embodiment, the four core material side protrusions 16 are arranged in parallel at equal intervals (intervals of 90 degrees). Moreover, the front end surface of each core material side protrusion 16 is formed as a convex curved surface having the same curvature, specifically, an arcuate curved surface along a circle centering on the center line L1.

  As shown in FIGS. 3A to 3C, the sleeve 20 includes a cylindrical body portion 21 and a disk-like flange 22 provided on the outer periphery of the end portion on the proximal end side of the body portion 21. ing. A second operating portion 23 is provided on the outer peripheral surface of the flange 22 so as to protrude outward in the radial direction.

  As shown in FIGS. 3 (b) and 3 (c), accommodating portions 24 that open to the outside are formed inside the cylindrical barrel portion 21 at the proximal end side and the distal end side of the barrel portion 21. . The housing part 24 is formed in a size that allows the shaft part 12 to rotate in a state where the shaft part 12 of the core member 10 is inserted into the housing part 24. Further, four end walls 25 that protrude inward from the inner peripheral surface of the trunk portion 21 and partially block the opening on the distal end side of the accommodating portion 24 are provided on the distal end side of the trunk portion 21. The inner side surface 26 of each end wall 25 is formed in a planar shape. The opening on the distal end side of the accommodating portion 24 has a substantially square shape surrounded by the planar inner side surface 26 of the four end walls 25.

  As shown in FIGS. 3B and 3C, the end wall 25 of the body portion 21 has a thin wall along the inner side surface 26 of the end wall 25 (four square sides formed by the inner side surface 26 of the end wall 25). Hinge portion 27 is provided. The hinge portion 27 is provided so as to extend toward the distal end side of the trunk portion 21 while being inclined toward the center line L2. Here, the hinge portion 27 is preferably a hinge portion having a predetermined length (for example, a length of 0.5 mm or more) so as to relieve stress at the time of bending. In addition, the upper limit of the length of the hinge part 27 is 3 mm, for example.

  As shown in FIGS. 3A to 3C, a pivot piece 30 that extends toward the distal end side of the trunk portion 21 along the center line L <b> 2 is connected to the distal end of each hinge portion 27. That is, the four turning pieces 30 are provided on the end face on the distal end side of the body portion 21 via the hinge portions 27 so as to be positioned on the four sides of the square. As shown in FIG. 3C, the swivel piece 30 includes a first portion 31 that extends toward the center line L2 and a second portion 32 that extends toward the distal end side of the trunk portion 21 along the center line L2 in a cross-sectional view. It is formed in the substantially L shape which has.

  As shown in FIGS. 3B and 3C, a turning-side protrusion 34 is provided on the proximal end surface 33 of the turning piece 30. A side surface 34 a on the hinge portion 27 side of the turning-side protrusion 34 is formed as an inclined surface that is inclined in a direction away from the hinge portion 27 from the proximal end side to the distal end side of the turning-side protrusion 34. Further, the tip surface of the turning-side protrusion 34 of each turning piece 30 is a concave curved surface having the same curvature, specifically, an arc shape along a circle centering on the center line L2 in a state of turning outward. It is formed to be a curved surface. In addition, the curvature of the front end surface of each turning side protrusion 34 is the same as or slightly larger than the curvature of the front end surface of each core member protrusion 16.

  As shown in FIGS. 3 (a) and 3 (c), a contact portion that protrudes toward the distal end side of the trunk portion 21 is located at a position radially outside the base portion of each hinge portion 27 on the end face on the distal end side of the trunk portion 21. 28 is provided. The protruding length of the contact portion 28 is set to a length substantially equal to the sum of the length of the hinge portion 27 and the length of the first portion 31 of the turning piece 30.

  In addition, a columnar protection portion 29 that protrudes toward the distal end side of the trunk portion 21 is provided on the end face on the distal end side of the trunk portion 21. The protection part 29 is formed in the circumferential direction of the body part 21 so as to avoid the part where the hinge part 27 and the swivel piece 30 are formed. That is, in the present embodiment, a total of four protection portions 29 are formed at portions corresponding to the four corners of the square formed by the inner surface 26 of the end wall 25.

  As shown in FIGS. 1 and 4, the rivet R matches the center line L <b> 1 of the core material 10 with the center line L <b> 2 of the sleeve 20, so that the rivet R is located at an intermediate position (for example, the core material 10 The pressing portion 15 is inserted up to the position where the pressing portion 15 abuts against the turning-side protrusion 34 of the turning piece 30). At this time, the circumferential direction positions of the core member 10 and the sleeve 20 are viewed in the direction of the insertion axis L3 in which the center line L1 of the core member 10 and the center line L2 of the sleeve 20 are aligned, and the pressing portion 15 of the core member 10 is. This is a position where the circumferential position of the core member side protrusion 16 and the circumferential position of the swivel piece 30 in the sleeve 20 do not overlap.

Next, a method for fixing the laminated material 40 formed by laminating two plate-like members using the rivet R will be described.
As shown in FIG. 4, the laminated material 40 is provided with an attachment hole 41 penetrating the laminated material 40. The rivet R in the basic state is inserted into the mounting hole 41 from the lower side, and the flange 22 of the sleeve 20 is brought into contact with the lower surface of the laminated material 40 (first process). Then, the core material 10 is pushed from below, and the core material 10 is further inserted into the accommodating portion 24 of the sleeve 20 (second process).

  Thereby, as shown in FIG. 5, the turning piece 30 of the sleeve 20 turns outward. Specifically, the turning-side protrusion 34 of the turning piece 30 is turned upward by being pressed upward by the tip surface of the pressing portion 15 of the core member 10 (the portion where the core member-side protrusion 16 is not provided). The piece 30 pivots so as to open outward while bending the hinge portion 27.

  Here, about the turning side protrusion 34 of the turning piece 30, the side surface 34 a on the hinge portion 27 side is formed as an inclined surface (see FIG. 3C). Along with the upward movement of the pressing portion 15 of the core member 10, the contact portion of the turning-side protrusion 34 with the pressing portion 15 moves on the inclined surface (side surface 34 a), so that the turning piece 30 is moved. The force pushing upward is easily converted to the direction of turning the turning piece 30. As a result, the turning piece 30 turns smoothly outward.

  And as shown to Fig.6 (a), the press part 15 of the core material 10 is inserted into the inner side of each turning piece 30 turned outside (3rd process). Here, as shown in FIG. 6 (b), the radial length D1 from the insertion axis L3 (center line L1) at the portion where the core member side protrusion 16 is not provided in the pressing portion 15 is outward. The length is set equal to or shorter than the distance from the tip of the turning-side protrusion 34 of the turning piece 30 that has turned to the insertion axis L3 (center line L2). Therefore, the pressing portion 15 of the core member 10 can enter the inside of each turning piece 30 without strongly pushing the turning piece 30 turned outward. Therefore, the revolving piece 30 is not moved by the pressing portion 15 in the direction away from the insertion axis L3, and the hinge portion 27 is not greatly extended.

  6 (a) and 6 (b), that is, in a state where the core member 10 is inserted into the sleeve 20 and the swivel piece 30 is swung outward, the base end side end surface 33 of the swivel piece 30 is on the core side. The position where the protrusion 16 does not face corresponds to the non-engagement position described in the claims.

  Next, as shown in FIGS. 7A and 7B, the first operating portion 11 a on the core material 10 side and the second operating portion 23 on the sleeve 20 side are operated to insert the insertion axis with respect to the sleeve 20. The core material 10 is relatively rotated by a predetermined angle (45 degrees) around L3, and the core material side protrusion 16 is made to face the proximal end surface 33 of the turning piece 30 (fourth process).

  Here, as shown in FIG. 7 (b), the radial length D2 from the insertion axis L3 (center line L1) at the portion of the pressing portion 15 where the core member side protrusion 16 is provided turns outward. The distance from the tip of the turning-side protrusion 34 of the turning piece 30 to the insertion axis L3 (center line L2) is set longer. Therefore, the core material side protrusion 16 is in a state (overlapping state) where the core material side protrusion 16 and the turning side protrusion 34 are engaged in the insertion direction. Thereby, the withdrawal of the core material 10 from the sleeve 20 is restricted.

  7 (a) and 7 (b), that is, in a state where the core member 10 is inserted into the sleeve 20 and the swivel piece 30 is swung outward, the base end side end surface 33 of the swivel piece 30 is on the core side. The position where the protrusion 16 faces and the turning-side protrusion 34 and the core member-side protrusion 16 engage with each other corresponds to the engagement position described in the claims. Note that the pressing portion 15 is formed so as to be positioned on the distal end side with respect to the turning-side protruding portion 34 of the turning piece 30 turned outward when the core member 10 is in the non-engagement position and the engagement position. .

  Further, as shown in the enlarged portion of FIG. 7A, when the core member 10 is in the engaged position, the distal end of the core member side protrusion 16 approaches or comes into contact with the proximal end surface 33 of the turning piece 30. The abutting portion 28 provided at the tip of the sleeve 20 approaches or abuts on the turning piece 30 (first portion 31). The abutting portion 28 is provided at a position sandwiching the base end side portion of the swivel piece 30 in the radial direction between the core member-side protrusion 16 at the engagement position, and thereby the inner side of the swivel piece 30. In particular, the turning piece 30 is restricted from turning inward with one contact portion as a fulcrum.

  As described above, as shown in FIGS. 7A and 7B, the rivet R can be rotated by rotating the core member 10 relative to the sleeve 20 from the non-engagement position to the engagement position. It will be in the fixed state in which turning to the inside and withdrawal of the core material 10 from the sleeve 20 are restricted. Then, as shown in FIGS. 8A and 8B, the laminated material 40 is sandwiched between the turning pieces 30 that turn to the outside of the rivet R in the fixed state and the flange 22 provided on the sleeve 20. . As a result, the laminated material 40 is fixed integrally.

  As shown in FIG. 8 (a), on the tip side of the rivet R in the fixed state, the turning piece 30 that has turned outward is disposed between the adjacent protection portions 29. Here, the protection part 29 is formed at the same height as the distal end surface of the core member 10 or at a height protruding from the distal end surface toward the distal end side in the insertion direction. As a result, when an object collides with the rivet R from the distal end side in the insertion direction, the distal end surface of the core member 10 is directly pressed by the object coming into contact with the protection portion 29, and As a result, it can suppress that a fixed state changes.

  In addition, even after the rivet R is in the fixed state, the rivet R can be removed from the laminated material 40 by performing the above-described fixing procedure in reverse. Specifically, the position of the core material 10 is returned from the engaged position to the non-engaged position. Accordingly, in the insertion direction, the core-side protrusion 16 and the turning-side protrusion 34 are in a positional relationship that does not overlap in the insertion direction, and the core material 10 can be extracted from the sleeve 20. Thereafter, the rivet R is removed from the laminated material 40 by withdrawing the core material 10 from the sleeve 20 and withdrawing the sleeve 20 from which the core material 10 has been removed from the laminated material 40.

Next, the operation of this embodiment will be described.
The rivet R is located in the pressing portion 15 of the core material 10 between a portion where the core material side protrusion 16 is positioned and the length in the radial direction is long and the adjacent core material side protrusion 16 in the circumferential direction. And a portion having a short radial length. And the core material 10 and the sleeve 20 are comprised so that relative rotation is possible.

  Therefore, as described above, first, the core member 10 is inserted into the sleeve 20 by matching the circumferential position of the portion having the short radial length in the pressing portion 15 with the position where the turning piece 30 is provided in the sleeve 20. Then, the turning piece 30 is turned outward and the pressing portion 15 is inserted inside the turning piece 30 turned outward. Next, the core member 10 is rotated relative to the sleeve 20, specifically, from the non-engagement position where the core member protrusion 16 does not face the proximal end surface 33 of the turning piece 30, the proximal end surface 33. The rivet R can be brought into a fixed state by being relatively rotated to the engagement position where the core-side protruding portion 16 is opposed.

  In this case, at the timing when the pressing portion 15 enters the inside of the turning piece 30 that has turned outward, the portion of the pressing portion 15 that faces the proximal end surface 33 of the turning piece 30 is a portion having a short radial length. Therefore, it is difficult for the pressing portion 15 and the turning-side protruding portion 34 of the turning piece 30 to interfere with each other, and the turning piece 30 is pushed outward and the hinge portion 27 is prevented from being extended.

  Then, after the core material 10 is relatively rotated to the engagement position with respect to the sleeve 20, the core material side protrusion 16, that is, the core material side protrusion 16 in the pressing portion 15 is provided and has a radial length. Ensuring that the long portion engages with the turning-side protruding portion 34 of the turning piece 30, ensures sufficient hooking between the core material 10 and the turning piece 30 to regulate the withdrawal of the core material 10 from the sleeve 20. Can do.

Next, the effect of this embodiment will be described.
(1) The rivet R includes a sleeve 20 having a flange 22 and a core member 10 inserted into the sleeve 20. A plurality of turning pieces 30 are provided on the sleeve 20 via hinges 27. A turning-side protrusion 34 is provided on the base end side end surface 33 of the turning piece 30. The core member 10 is provided with a pressing portion 15 that turns the turning piece 30 outward when inserted into the sleeve 20. On the peripheral surface of the pressing portion 15, a plurality of core-side protrusions 16 projecting radially outward from the tip of the turning-side protrusion 34 of the turning piece 30 that has turned outward are provided at intervals in the circumferential direction. It has been. In the state where the core member 10 is inserted into the sleeve 20 and the swivel piece 30 is swung outward, the disengagement position where the core-side protrusion 16 does not face the proximal end surface 33 of the swivel piece 30, and the swivel piece Rotate relative to the sleeve 20 between the base end side end face 33 of the core 30 and the engagement position at which the core side protrusion 16 engages with the turning side protrusion 34. It is configured to be possible.

  According to the above configuration, the swing piece 30 can be turned outward without applying a large load to the hinge portion 27, and the core material 10 can be prevented from coming out of the sleeve 20. Therefore, even when it is used once after being used once, it is possible to suppress a decrease in the pulling force of the rivet R due to deterioration of the hinge portion 27.

  (2) The radial length D1 from the insertion axis L3 at the portion where the core member-side protrusion 16 is not provided in the pressing portion 15 is the insertion axis from the tip of the turning-side protrusion 34 of the turning piece 30 turned outward. It is a length equivalent to the distance to L3, or a length shorter than that distance.

  At the timing when the pressing part 15 enters the inside of the turning piece 30 that has turned outward, it is possible to avoid pushing the turning piece 30 strongly outward. Therefore, deterioration of the hinge part 27 at the time of attachment can be suppressed more effectively. The same effect can be obtained when the core member 10 in the non-engagement position is extracted from the sleeve 20.

(3) When the core material 10 is in the engaged position, the core material side protrusion 16 approaches or contacts the proximal end surface 33 of the turning piece 30 that has turned outward.
According to the above configuration, when the rivet R is in the fixed state, the turning to the inside of the turning piece 30 from the state turning to the outside can be effectively restricted.

  (4) At the position on the radially outer side of the portion of the sleeve 20 to which the hinge portion 27 is connected, the swiveling piece 30 (first portion 31) that has swung outwardly approaches or contacts the radially outer side. A contact portion 28 is provided. The abutting portion 28 is provided at a position between which the base end side portion of the swiveling piece 30 swung outward is sandwiched in the radial direction between the abutting portion 28 and the core member-side protruding portion 16 at the engaging position.

According to the above configuration, when the rivet R is in the fixed state, the turning to the inside of the turning piece 30 from the state turning to the outside can be effectively restricted.
(5) The distal end surface of the core member-side protrusion 16 and the proximal end surface 33 of the swivel piece 30 are formed into curved surfaces along a circle centered on the insertion axis L3 (centerlines L1, L2).

  According to the above configuration, when the core material 10 is relatively rotated from the non-engagement position to the engagement position, the core material side protrusion 16 and the base end side end surface 33 interfere with each other, and the hinge portion 27 is twisted. It can suppress that a load acts. Further, in a state where the core member 10 is positioned at the engagement position and the core member-side protruding portion 16 is opposed to the proximal end surface 33, the surfaces are turned in a predetermined range, thereby turning outward. The effect of restricting the turning to the inside of the turning piece 30 is also enhanced.

In addition, this embodiment can also be changed and embodied as follows.
In the above embodiment, four swivel pieces 30 are provided, but the number of swivel pieces 30 is not particularly limited. For example, the set of opposed turning pieces 30 among the four turning pieces 30 of the above embodiment may be omitted, and the rivet R including the two turning pieces 30 may be used.

  -Arrangement | positioning of each turning piece 30 in the circumferential direction of the sleeve 20 is not specifically limited. However, from the viewpoint of stabilizing the fixed state of the rivet R, the swiveling pieces 30 are arranged at equal intervals in the circumferential direction of the sleeve 20, and the clamping pressure of the swiveling piece 30 and the flange 22 in the circumferential direction of the sleeve 20 is reduced. It is preferable to reduce the bias. For example, when three swivel pieces 30 are provided, it is preferable to arrange the swivel pieces 30 so as to be positioned on each side of the equilateral triangle. In addition, the shape of the pressing part 15 in the core material 10 and the arrangement of the core material side protrusions 16 are appropriately changed according to the arrangement of the swivel pieces 30.

  -In above-mentioned embodiment, although the turning side protrusion 34 of the turning piece 30 was a protrusion, the shape of the turning side protrusion 34 is not specifically limited. For example, the turning-side protrusion 34 may be a columnar or hemispherical protrusion.

  In the above embodiment, the radial length D1 of the portion of the pressing portion 15 where the core member side protrusion 16 is not provided is from the tip of the turning side protrusion 34 of the turning piece 30 turned outward to the insertion axis L3. The length is equal to or shorter than the distance, but may be longer than the same distance.

  In this case, the pressing part 15 interferes with the turning-side protrusion 34 of the turning piece 30 at the timing when the pressing part 15 enters the inside of the turning piece 30 that has turned outward. However, since the degree of interference is reduced by the amount shorter in the radial direction than the portion of the pressing portion 15 where the core material side protrusion 16 is provided, the hinge portion 27 is also extended in this case. A difficult effect is obtained. Note that the lower limit of the radial length D1 of the portion of the pressing portion 15 where the core member side protrusion 16 is not provided is that when the core member 10 is inserted into the sleeve 20, the rotating piece 30 is pressed to rotate outward. This is the minimum length that can be generated.

  In the above embodiment, the radial length D2 of the portion of the pressing portion 15 where the core material side protrusion 16 is provided is such that when the core material 10 is in the engaged position, the tip of the core material side protrusion 16 is Although it was set as the length which adjoins or contact | abuts to the base end side end surface 33 of the turning piece 30, you may make it the length which does not adjoin or contact | abut to the base end side end surface 33. FIG. In this case, when the core material 10 is relatively rotated from the non-engagement position to the engagement position, it is possible to suppress interference between the core material-side protrusion 16 and the proximal end surface 33. In addition, from the viewpoint of regulating the turning of the swivel piece 30 from the state of being completely swung outward, the above-mentioned radial length D2 is set to the core-side protrusion when the core member 10 is in the engagement position. It is preferable that the tip end of 16 has a length that is at least close to the proximal end surface 33 of the swivel piece 30.

  In the above embodiment, the distal end surface of the core member side protrusion 16 and the proximal end side end surface 33 of the swivel piece 30 are formed into curved surfaces along a predetermined circle, but the shape of each of these surfaces may be changed. Good. For example, the base end side end surface 33 of the swivel piece 30 may be planar along the hinge portion 27. Also in this case, when the core member 10 is relatively rotated from the non-engagement position to the engagement position, the core member-side protrusion 16 and the proximal end surface 33 are less likely to interfere with each other. Further, the distal end surface of the core member side protrusion 16 and the proximal end surface 33 of the swivel piece 30 have a shape that causes some interference when the core member 10 is relatively rotated from the non-engagement position to the engagement position. It may be.

  A guide portion that guides the movement of the core member 10 in the sleeve 20 may be provided. As the guide portion, for example, with respect to the inner peripheral surface of the body portion 21 of the sleeve 20, a longitudinal recess extending along the insertion axis L <b> 3, and a circumference extending in the circumferential direction continuously from the distal end in the insertion direction of the longitudinal recess. An L-shaped guide recess comprising a directional recess is provided. And the guide protrusion which is inserted in a guide recessed part with respect to the axial part 12 of the core material 10, and can move the inside of a guide recessed part along the L-shape is provided. In this case, the guide protrusion moves along the longitudinal recess of the guide recess to guide the insertion operation of the core member 10 into the sleeve 20, and the guide protrusion along the circumferential recess of the guide recess. As a result of the movement, the core 10 rotation operation from the non-engagement position to the engagement position is guided.

  A positioning portion that positions the core material 10 with respect to the sleeve 20 when the core material 10 is located at a predetermined position (for example, a position in a basic state, a non-engagement position, or an engagement position) may be provided. The positioning portion is provided to such an extent that the insertion operation and the rotation operation of the core member 10 with respect to the sleeve 20 are not impossible.

Next, the technical idea that can be grasped from the embodiment and the modified examples will be described.
(A) A contact portion that is close to or contacts the radially outer side of the turning piece that is turned outward is provided at a position on the radially outer side of the portion of the sleeve to which the hinge portion is connected. Said rivet.

  (B) The contact portion is provided at a position between which the base end side portion of the swiveling piece swung outward is radially sandwiched between the abutting portion and the core member side protruding portion at the engaging position. The rivet.

  L1, L2 ... center line, L3 ... insertion axis, R ... rivet, 10 ... core material, 15 ... pressing part, 16 ... core material side protrusion, 20 ... sleeve, 22 ... flange, 24 ... housing part, 27 ... hinge , 30 ... turning piece, 33 ... proximal end side surface, 34 ... turning side protrusion.

Claims (3)

A sleeve having a flange, and a core member inserted into the sleeve,
The sleeve is provided with a plurality of swivel pieces via a hinge portion,
When the core material is inserted into the sleeve, the swiveling piece is pressed by the core material and swivels outward,
On the base end side end surface of the swivel piece, a swivel protrusion is provided,
The core member is provided with a pressing portion that presses the turning-side protrusion of the turning piece when inserted into the sleeve to turn the turning piece outward,
On the peripheral surface of the pressing portion, a plurality of core side protrusions protruding outward in the radial direction from the tip of the turning side protrusion of the turning piece that is turned outward are provided at intervals in the circumferential direction. ,
In the state where the core member is inserted into the sleeve and the swiveling piece is swung outward, the disengagement position where the core-side protrusion does not face the base end side end surface of the swiveling piece, and the swiveling piece The core-side protrusion is opposed to the base-side end surface of the sleeve, and is rotatable relative to the sleeve between the engaging position where the turning-side protrusion and the core-side protrusion are engaged. A rivet characterized in that it is configured as follows.   The radial length from the insertion axis in the portion where the core side protrusion in the pressing portion is not provided is equivalent to the distance from the tip of the turning side protrusion of the turning piece that has turned outward to the insertion axis. The rivet according to claim 1, wherein the rivet has a length shorter than or a distance shorter than the distance. The core member side protrusion is provided so as to approach or abut on the base end side end surface of the swiveling piece swung outward when the core member is in the engagement position,
The front end surface of the core side protrusion and the base end side end surface of the swivel piece are formed in a curved surface along a circle centered on the insertion axis. The described rivet.

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