JP2011080544A - Rivet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rivet, which can provide a sure fixing structure between a rivet body and a pin body such that the rivet is never dropped out even when a force reverse to an inserting direction is applied to the pin body. <P>SOLUTION: The rivet includes the rivet body 21 having a plurality of locking pieces 26, 26 formed by boring a vertical hole 24 in a tack 22 having a collar portion 23 at an upper end and providing a vertical split groove 25 to extend from the lower end of the tack 22 to a bottom portion 24A of the vertical hole 24; and the pin body 27 to be pushed into the vertical hole 24 of the rivet body 21 from the upper end side, in which the locking pieces 26, 26 are extended outwardly by pushing the pin body 27 into the vertical hole 24. A recess 32 into which a locking portion 31 of the locking piece 26 is engaged is provided in the pin body 27. Therefore, when the pin body 27 is inserted to and held by the rivet body 21, the pin body 27 can be firmly held to the rivet body 21 against a stress from the inserted tip of the pin body 27 by the engagement of the locking portion 31 with the recess 32. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rivet, and more particularly to a rivet that pushes a pin body into a rivet body and spreads and fixes a stopper portion formed on the rivet body.

  Conventionally, this type of pin push-in type rivet includes a rivet body 1 and a pin body 7 having a structure as shown in FIGS. That is, in the figure, reference numeral 1 denotes a rivet main body, and the rivet main body 1 is mainly composed of a cylindrical housing 2 and a flange 3 provided at the upper end thereof. Is provided with a vertical hole 4 having the same diameter extending from the upper end to the vicinity of the lower end.

  Reference numerals 5 and 5 denote a plurality of longitudinally split grooves extending from the lower end of the housing 2 to about ½ of the entire length thereof, and are formed radially. The lower ends of the housing 2 are formed by the longitudinal grooves 5 and 5. A plurality of stopper portions 6 and 6 are formed on the plate. Reference numeral 7 denotes a pin body that is paired with the rivet body 1 and has an outer diameter that is smaller than the inner diameter of the vertical hole 4, and a head 8 that is larger in diameter than the flange 3 of the rivet body 1 at the upper end. A recess 9 is formed on the lower surface of the head 8 so as to accommodate the collar 3 inside.

  Therefore, when a plurality of objects, for example, two plate-like bodies 10 and 11 are fixed by this rivet, the rivet insertion holes 10A having the same diameter in the two plate-like bodies 10 and 11 stacked one above the other are provided. 11A is formed, and a rivet in which the rivet body 1 and the pin body 7 are assembled is inserted into the overlapped two rivet insertion holes 10A and 11A from the stopper portion 6 of the rivet body 1. One of the plate-like bodies 10 and 11 is an attachment member, and the other is an attachment member.

  Then, as shown in FIG. 6, after inserting the flange portion 3 of the rivet main body 1 until it comes into contact with the upper surface of the upper plate-like body 10, the pin body 7 is inserted into the portion of the head 8 as shown in FIG. Is pushed with a finger so that the tip 7A breaks through the bottom 4A of the vertical hole 4. As a result, each vertical dividing groove 5 portion is expanded, each stopper piece 6 is pushed outward on the lower surface of the lower plate-like body 11, and the bent base 6A of each stopper piece 6 is inserted into the rivet. The periphery of the lower surface of the hole 11A is caulked.

  Thus, the upper and lower two plate-like bodies 10 and 11 are sandwiched between the upper portion on the lower surface of the flange portion 3 of the rivet body 1 and the lower portion on the bent base portion 6A of each stopper piece portion 6, respectively. Thus, the two upper and lower plate-like bodies 10 and 11 are fixed together.

Japanese Patent Laid-Open No. 11-303827 (FIGS. 6 to 8)

  In the rivet of the prior art described above, the pin body 7 and the rivet body 1 are merely in pressure contact with each other at the inwardly projecting portion 6A of the stopper piece 6 so that the rivet body 1 and the pin body 7 The bond is weak. Therefore, when a force in the direction opposite to the insertion direction is applied to the lower end of the pin body 7, the pin body 7 moves upward, and the tightness of the plate-like bodies 10, 11 may be weakened or the pin body 7 may come off. There is.

  Therefore, in view of the above-described problems, the present invention provides a rivet in which a rivet main body and a pin body can be securely fixed even if a force in the direction opposite to the insertion direction is applied to the pin body. For the purpose.

  In order to achieve the above object, according to the first aspect of the present invention, a vertical hole is formed in a casing having a flange at the upper end, and the vertical hole extends from the lower end of the casing to the bottom of the vertical hole. A rivet body having a split groove to form a plurality of stopper pieces; and a pin body that is pushed into the longitudinal hole of the rivet body from its upper end, and the pin body is pushed into the longitudinal hole to In the rivet that extends between the stopper pieces, a concave portion into which the engaging portion of the stopper piece is engaged is provided in the pin body.

  The invention according to claim 2 is characterized in that a plurality of engaging portions are formed at the engaging portion between the engaging portion and the recessed portion.

  The invention according to claim 3 is characterized in that the recess is formed longer in the length direction of the pin body than the engaging portion. A clearance hole larger than the width of the longitudinal groove is provided below the engaging portion.

  The invention according to claim 4 is characterized in that a relief hole larger than the width of the longitudinal groove is provided below the engaging portion.

  According to the rivet described in claim 1 of the present invention, when the pin body is inserted and held in the rivet body, the engaging portion is engaged in the recess, so that the rivet body is subjected to stress from the insertion tip of the pin body. The pin body can be firmly held.

  Further, according to the rivet described in claim 2 of the present invention, it is possible to improve holding accuracy and prevent rattling due to vibration or the like.

  Moreover, according to the rivet described in claim 3 of the present invention, it is possible to absorb the dimensional tolerance when held, and to improve versatility.

  Further, according to the rivet described in claim 4 of the present invention, it is possible to prevent the tip of the pin body from coming into contact with the inner surface of the stopper portion by the escape hole, and the engaging portion and the recessed portion can be reliably engaged. .

It is sectional drawing of the adhering state which shows Example 1 of a present Example. FIG. 4 is an enlarged cross-sectional view of the rivet tip side in a fixed state. It is an exploded front view of the rivet which made the rivet main body a cross section same as the above. It is sectional drawing which shows the process of pushing a pin body into a rivet main body same as the above. It is a disassembled front view of the rivet which made the cross section the rivet main body which shows a prior art. It is sectional drawing which shows the process of pushing a pin body into a rivet main body same as the above. It is sectional drawing of a fixed state same as the above.

  Embodiment 1 of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 to 4, the rivet made of synthetic resin includes a rivet main body 21 and a pin body 27, and the rivet main body 21 includes a columnar casing 22 and a flange 23 provided at the upper end thereof. And a bottomed vertical hole 24 is drilled in the axial center of the housing 22 from the upper end, which is the base end, to the lower side, which is the front end. A relief hole 24B is formed toward the head. The bottom 24A of the vertical hole 24 is formed in a concave curved surface, and the escape hole 24B is smaller in diameter than the vertical hole 24.

  In the rivet body 21, radial vertical grooves 25, 25 extending from the lower end of the casing 22 to above the bottom 24A are formed, and the vertical grooves 25, 25 allow the lower end of the casing 22 to be formed. A plurality of stopper pieces 26 are formed. In this example, the longitudinal grooves 25, 25 are arranged in a plane cross shape, and four stopper pieces 26 are formed. The pin body 27 is paired with the rivet body 21, and the outer diameter of the pin body 27 is smaller than the inner diameter of the vertical hole 24 but larger than the width of the vertical dividing groove 25. Note that the inner diameter of the escape hole 24B is larger than the width of the vertical dividing groove 25, and the inner diameter of the escape hole 24B is smaller than the inner diameter of the vertical hole 24. A head portion 28 is provided at the upper end of the pin body 27, and a lower surface that is a distal end surface of the head portion 28 abuts on an upper surface that is a proximal end surface of the flange portion 23.

  A convex engaging portion 31 is formed on the stopper piece 26 so as to protrude inward between the bottom portion 24A and the escape hole 24B. Further, a concave portion 32 into which the engaging portion 31 is engaged is provided on the lower end side of the pin body 27, and the length of the concave portion 32 is longer than that of the engaging portion 31, and the concave portion 32 is an engaging portion. A plurality of circumferential groove portions 33 are formed side by side in the length direction of the pin body 27, the circumferential groove portion 33 has a substantially triangular cross section, and the upper corner portion 31 </ b> A of the engaging portion 31 engages with the circumferential groove portion 33. The lower end portion 27A of the pin body 27 is formed in a convex curved surface substantially corresponding to the bottom portion 24A. The lower end side step surface 32A of the concave portion 32 is substantially orthogonal to the axis of the pin body 27, and the upper end step surface 32B of the concave portion 32 is a tapered surface that decreases toward the lower end side. An angle of about 45 degrees is formed with the axis of the body 27, and this angle is preferably about 35 to 55 degrees.

  Therefore, in use, the pin body 27 is inserted into the vertical hole 24 of the rivet body 21 and assembled together as in the prior art. When a plurality of objects, for example, the two plate-like bodies 10 and 11 are fixed by the rivet, the rivet insertion hole 10A having the same diameter in the two plate-like bodies 10 and 11 stacked one above the other is used. 11A are formed, and a rivet in which the rivet main body 21 and the pin body 27 are assembled is inserted into the two rivet insertion holes 10A, 11A superimposed on each other from the stopper portion 26 of the rivet main body 21.

  As shown in FIG. 4, after inserting the flange portion 23 of the rivet body 21 until it comes into contact with the upper surface of the upper plate-like body 10, the pin body 27 is pushed into the portion of the head portion 28 with a finger. The lower end portion 27A enters between the engaging portions 31 and 31. As a result, as shown in FIG. 1, the stopper piece 26 bulges outward, and its outer peripheral surface is in a compacted state with the inner peripheral surface of the rivet insertion hole 11A formed in the lower plate-like body 11. .

  When the pin body 27 is further pushed in from this state, the lower end portion 27A breaks through between the engaging portions 31 and 31, the vertical dividing grooves 25 and 25 are respectively expanded, and the respective stopper portions 26 are formed in the lower portion. The bottom surface of the plate-like body 11 is pushed outward, and the bent base portion 26A of each stopper piece 26 caulks the periphery of the bottom surface of the rivet insertion hole 11A. On the lower surface of 23, the lower portion is sandwiched between the bent base portions 26A of the stopper portions 26, and the upper and lower two plate-like bodies 10 and 11 are fixed together.

  At the time of fixing, the engaging portion 31 fits into the recessed portion 32 and bites into the recessed portion 32, and the upper corner portion 31A of the engaging portion 31 is engaged with the circumferential groove portion 33. Can be prevented. In addition, since a plurality of circumferential groove portions 33 are provided in the recess 32 along the length direction at substantially equal intervals, even if an error occurs in the insertion dimension of the pin body 27 due to a dimensional error or the like, the upper corner portion 31A is Further, it can be used to fix the plate-like bodies 10 and 11 having different total thicknesses corresponding to the circumferential groove portion 33 and corresponding to the length of the concave portion 32. Further, as shown in FIG. 2, since the relief hole 24 </ b> B is formed at the lower end of the pin body 7, the lower end side of the stopper piece 26 hits the lower end part of the pin body 27 without interfering with the engaging part. A reliable fitting state of 31 and the recess 32 is obtained.

  And, when the upward force F is applied to the pin body 7, there is a possibility that the pin body may shift because the stopper portion is conventionally only in pressure contact with the outer periphery of the pin body in a line contact state. In this embodiment, since the engaging portion 31 is engaged with the recessed portion 32 so as to be fitted, the pin body 27 can be prevented from shifting upward with respect to the rivet body 21. In this case, when an upward force F is applied to the pin body 27, an upward force is also applied to the rivet body 21 due to the engagement between the recess 32 and the engaging portion 31, and thus the upward force is applied to the rivet body 21. Is applied, the insertion hole 11A generates a force for narrowing between the stopper portions 26, 26, and thereby the engaging portion 31 is further pressed against the recess 32, and the fitting structure is strengthened.

  Further, as shown in FIG. 2, in the fitted state, the lower corner portion 31B of the engaging portion 31 is located in the recessed portion 31, specifically, the inner side of the outer periphery of the lower step surface 32B. Even if only 27 moves upward, the lower corner portion 31B is locked to the lower step surface 32B, so that a reliable retaining effect can be obtained.

  As described above, in this embodiment, the vertical hole 24 is formed in the casing 22 having the flange 23 at the upper end, and the vertical dividing groove 25 extending from the lower end of the casing 22 to the bottom 24A of the vertical hole 24 is formed. A rivet body 21 provided with a plurality of stopper pieces 26, 26 and a pin body 27 that is pushed into the vertical hole 24 of the rivet body 21 from its upper end, and the pin body 27 is pushed into the vertical hole 24. In the rivet that extends between the stopper pieces 26, 26, since the pin body 27 is provided with the recess 32 into which the engaging portion 31 of the stopper piece 26 is engaged, when the pin body 27 is inserted and held in the rivet body 21, By engaging the engaging portion 31 in the recess 32, the pin body 27 can be firmly held on the rivet body 21 against stress from the insertion tip of the pin body 27.

  Further, in this embodiment, since the circumferential groove portion 33 as a plurality of engaging portions is formed at the bottom portion of the recessed portion 32 that is the engaging portion between the engaging portion 31 and the recessed portion 32, the holding accuracy is improved and vibration is performed. Can prevent backlash.

  Further, in this embodiment, since the concave portion 32 is formed longer in the length direction of the pin body 27 with respect to the engaging portion 31, the dimensional tolerance when held can be absorbed and versatility can be improved. .

  Further, in this embodiment, since the escape hole 24B larger than the width of the longitudinal groove 25 is provided below the engagement portion 31, even if the engagement positions of the engagement portion 31 and the recess 32 are different, the escape hole 24A is used. The tip of the pin body 27 can be prevented from coming into contact with the inner surface of the stopper piece 27, and the engagement portion 31 and the recess 32 can be reliably engaged.

  The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, the escape hole may be a tapered hole extending to the lower end side. Further, the shape of the circumferential groove is not limited to a triangle, and various shapes such as a trapezoid and a quadrangle can be adopted as long as the upper corner is engaged. Further, the upper corner and the lower corner may be curved corners. Moreover, the structure of the collar part 23 and the head part 28 may be the structure of the conventional collar part 3 and head part 8. Further, a plurality of circumferential groove portions serving as the engaging portions may be provided on the inner surface of the engaging portion corresponding to the circumferential groove portions serving as the engaging portions of the recesses.

21 Rivet body
23 Buttocks
24 vertical holes
24A bottom
24B escape hole
25 Longitudinal groove
26 Stop piece
27 pin body
31 Enrollment Department
32 recess
33 Circumferential groove (engagement part)

Claims (4)

A vertical hole is formed in a housing having a collar portion at the upper end portion, and a plurality of stopper pieces are formed by providing a longitudinal dividing groove extending from the lower end of the housing to the bottom portion of the vertical hole. In a rivet comprising a rivet body and a pin body that is pushed into the vertical hole of the rivet body from its upper end, the pin body is pushed into the vertical hole and the space between the stopper pieces is expanded. A rivet characterized in that the pin body is provided with a recess into which the insertion portion is engaged. The rivet according to claim 1, wherein a plurality of engaging portions are formed at engaging portions between the engaging portion and the recessed portion. The rivet according to claim 1, wherein the concave portion is formed longer in the length direction of the pin body than the engaging portion. The rivet according to any one of claims 1 to 3, wherein an escape hole larger than the width of the longitudinal groove is provided below the engaging portion.

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