JP2013249850A - Blind rivet and method of fastening the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blind rivet which can easily be fastened with a commercially available tool without using a fastening tool.SOLUTION: A blind rivet for fastening a mounting member (51), in which a mounting hole (53) is formed, to a mounted member (50), in which a mounting hole (52) is formed, includes: a bolt (10), which has a flange (11) of a large diameter, a column (13) adjacent to the flange, and a male screw part (15) adjacent to the column; a collar (40), on which a circular hole (43), through which the column of the bolt is passed, and a polygonal hole (44) adjacent to the circular hole are formed; a buckling nut (30), which has a polygonal head (31) that can be held in the polygonal hole of the collar so as not to be rotated, a tubular part (33) adjacent to the polygonal head and of which diameter can be expanded, and a female screw part (34) adjacent to the tubular part and which can be engaged with the male screw part of the bolt; and a shearable washer (20), which can be accommodated inside the polygonal hole of the collar around the column of the bolt.

Description

  The present invention relates to blind rivets. In particular, the present invention relates to a blind rivet and a fastening method thereof capable of simultaneously mounting a blind rivet and a mounting member.

A blind rivet including a hollow metal rivet body composed of a sleeve and a rivet head at one end of the sleeve and a metal mandrel whose shaft portion extends through a through hole of the rivet body is well known. The blind rivet has an advantage that a plurality of attached members can be connected by an operation only from one side.
The rivet body of the blind rivet has a cylindrical hollow sleeve having a rivet head formed at one end and extending from the rivet head. The mandrel of the blind rivet has a head portion having a diameter larger than the inner diameter of the sleeve at an end portion and a shaft portion that penetrates the rivet body. The mandrel is inserted into the through hole of the rivet body so that the mandrel head is disposed adjacent to one end of the sleeve opposite to the rivet head, and the mandrel shaft extends from the rivet head. It is assembled as a blind rivet.

The assembled blind rivet is inserted into a hole of a member to be attached such as a panel starting from the head of the mandrel, and the rivet head is brought into contact with the periphery of the hole of the member to be attached. In this state, holding the rivet head with a fastening tool, gripping the mandrel shaft and pulling it strongly from the rivet head side, the one end of the sleeve of the rivet body is deformed so that its diameter increases, The member to be attached can be fastened between the rivet head and one end portion of the expanded sleeve by breaking at the thin breakable portion of the shaft portion.
Since the conventional blind rivet breaks the mandrel shaft at a thin breakable portion, a fastening tool is required, and the load at the time of the break is not constant, and the attached member may be deformed.

U.S. Patent No. 6,057,051 discloses a blind fastener comprising an enlarged pin head and a pin having an elongated shank, an annular nut, an elongated tubular sleeve that receives the shank, and a shear washer. When the nut is operably connected to the pin and an axial force is applied to the pin and nut, the annealed portion of the sleeve expands outward, the shear washer breaks at the shear section, the pin breaks at the break neck groove, The fastener is fixed.
To attach the blind fastener of Patent Document 1, using a fixture having an external socket part and an internal socket part, the internal socket part is engaged with the grip part of the pin, the external socket part is engaged with the nut, Rotate the external socket and screw the nut onto the pin.
Patent Document 1 requires a dedicated fixture, and has a problem that the breaking load is not constant because the pin is broken at the break neck groove.
Further, since the shear washer is sheared by the lower end portion of the elongated sleeve after the sleeve is expanded outward, the sleeve may be deformed at the time of fastening.

U.S. Patent No. 6,057,051 discloses a blind bolt comprising a core pin having a blind head and a plurality of threads, a nut screwed into the screw of the pin, a main sleeve and an expandable sleeve. A tightening force adjusting structure having a support washer and a shear washer is provided. An axial force is applied to the core pin with a tool to expand the expandable sleeve outward and shear the shear washer. Thereafter, the core pin is broken at the annular breaking neck groove, the pin tail portion is cut, and the attachment is completed.
Patent Document 2 has the same problem as Patent Document 1.

  Patent Document 3 discloses a one-side bolt (blind rivet) including a pin having a pin head, a sleeve fitted to the outer periphery of the pin, and a nut screwed into a male screw portion of the pin. The sleeve has a sleeve body and a receiving shaft portion extending rearward through the shearing jaw. When the one-side bolt is fastened, when the nut is tightened, the soft sleeve portion is buckled, the shearing jaw portion is sheared, and the rear end of the sleeve body enters the receiving shaft portion. Thereafter, the pin is broken at the breaking groove, and the pin tail portion is cut off. The nut is further tightened, and a strong tightening axial force can be secured.

In cited documents 1 to 3, the sleeve is buckled, the shearing washer is sheared by the sleeve, the pin is broken at the breaking portion, and the blind rivet is fastened. Since the shearing washer is sheared by the elongated sleeve, a shearing washer that shears with a relatively weak force is required, and there is a problem that the fastening force is not constant.
Further, since the attachment member is attached to the attachment member (lower plate) at the same time as the blind rivet is fastened to the attached member, the attachment member may be deformed when fastening the blind rivet.

Patent Literature 4 discloses a fastening device including a nut-like rivet member having a flange portion at a base portion and a female screw portion on an inner peripheral surface on a distal end side, and a bolt member screwed into the rivet member. When the fastener is inserted into the through-holes in the two plates and the bolt member is rotated, the thin portion adjacent to the female threaded portion of the rivet member bends outward and presses the back of the plate. Two plates are fastened between the part and the flange part. Since the distal end portion of the fastening device is formed in a tapered shape, the fastening device can be smoothly inserted even if the through holes of the two plates are displaced.
In the fastening device of Patent Document 4, the flange portion is fixed with a fastening tool, and the bolt member is rotated using the polygonal hole in the head portion of the bolt member to fix the device, so that the fastening device is not used. Can be installed. However, the thin part of the rivet member is buckled and fastened, and the tightening torque gradually increases, so that the fastening end point cannot be clearly felt.

Therefore, there has been a demand for a blind rivet capable of easily attaching a blind rivet and attaching a mounting member in one process using a commercially available tool without using a fastening device.
Further, there has been a demand for a blind rivet in which the attached member is not deformed, torque management at the time of fastening is not required, and the completion of the fastening can be felt in response.

Special table 2003-504571 JP-A-8-121443 JP 11-159509 A Japanese Utility Model Publication No. 1-82310

Accordingly, an object of the present invention is to provide a blind rivet capable of attaching a blind rivet and attaching a mounting member in one step using a commercially available tool without using a fastening tool.
Another object of the present invention is to provide a blind rivet in which the attached member is not deformed, torque management at the time of fastening is not required, and the completion of fastening can be felt in a responsive manner.
Still another object of the present invention is to provide a blind rivet capable of adjusting the pressing force of the blind rivet.
Yet another object of the present invention is to provide a blind rivet in which the mounting member can be removed from the mounted member and the mounting member can be reattached.

In order to achieve this object, the blind rivet of the present invention comprises four parts: a bolt, a washer, a buckling nut, and a collar.
In the present invention, in the first stage, the bolt is screwed into the buckling nut, the tubular portion of the buckling nut is expanded, the blind rivet is fixed to the mounted member, and in the second stage, the bolt is further screwed in, The washer is broken by the bolt, the collar is pushed by the head of the bolt, the mounting member is sandwiched between the collar and the tubular portion with the enlarged diameter of the buckling nut, and the mounting member is attached to the mounting member. .

A first aspect of the present invention is a blind rivet for fastening an attachment member formed with an attachment hole to an attached member formed with an attachment hole,
A bolt having a large-diameter flange, a cylindrical portion adjacent to the flange, and a male screw portion adjacent to the cylindrical portion;
A collar formed with a circular hole through which the cylindrical portion of the bolt passes, and a polygonal hole adjacent to the circular hole;
A polygonal head that can be held so as not to rotate in the polygonal hole of the collar, a tubular portion that is adjacent to the polygonal head and can be expanded in diameter, and an external thread portion of the bolt that is adjacent to the tubular portion. A buckling nut having a female thread portion that can be engaged with the through-hole,
A blind rivet comprising: a shearable washer that can be accommodated inside the polygonal hole of the collar around the cylindrical portion of the bolt.

Thereby, a blind rivet can be easily attached using a commercially available tool, without using a fastening tool.
In addition, it is possible to obtain a blind rivet in which the attached member is not deformed, torque management at the time of attachment is not required, and the completion of fastening can be felt in response.

The cylindrical portion of the bolt is inserted into the circular hole of the collar,
The washer is disposed around the bolt in the polygonal hole of the collar;
It is preferable that the male screw portion of the bolt is assembled so as to engage with the female screw portion of the buckling nut.
Thereby, the assembled blind rivet can be inserted into the mounting holes of the mounting member and the mounted member, and the mounting member can be fastened to the mounted member.

  It is preferable that the washer is sheared between a step portion at an end portion of the cylindrical portion of the bolt and an end surface of the polygonal head portion of the buckling nut.

And a cylindrical sleeve having an inner diameter larger than the outer diameter of the cylindrical portion of the bolt and an outer diameter matching the inner diameter of the through hole of the polygonal head portion of the buckling nut,
In the collar, a second circular hole having an inner diameter larger than the inner diameter of the circular hole is preferably formed between the circular hole and the polygonal hole (second embodiment).

The cylindrical portion of the bolt is inserted into the circular hole of the collar,
The washer is disposed around the bolt in the polygonal hole of the collar;
The sleeve is disposed in the through-hole of the polygonal head portion of the buckling nut, and the washer is adjacent to the sleeve;
It is preferable that the male screw portion of the bolt is assembled so as to engage with the female screw portion of the buckling nut.

  It is preferable that the washer is sheared by a step portion of the second circular hole of the collar and an end surface of the sleeve.

It is preferable that a polygonal hole having a polygonal inner shape is formed on the end face of the flange of the bolt to insert a tool.
In order to fix the said collar with a tool, it is preferable that an external shape has a polygonal part with a polygon.
The polygon is preferably a hexagon.
Thus, the collar can be fixed, the bolt can be rotated, and the bolt can be engaged with the buckling nut.

A second aspect of the present invention is a method for fastening the blind rivet,
Align the mounting hole of the mounting member and the mounting hole of the mounted member,
The assembled blind rivet is inserted into the mounting hole of the mounting member and the mounting hole of the mounted member from the mounting member side,
Abutting the polygonal head of the buckling nut against the surface around the mounting hole of the mounted member;
The collar is fixed, the bolt is rotated, and the male screw portion of the bolt is further engaged with the female screw portion of the buckling nut,
The diameter of the tubular portion of the buckling nut is expanded, and a mounting member is fastened between the polygonal head of the buckling nut and the tubular portion,
The bolt is further rotated, the male threaded portion of the bolt is further engaged with the female threaded portion of the buckling nut, and the washer is sheared,
The flange of the bolt includes a step of pressing one end surface of the collar, pressing the mounting member against the mounted member with the other end surface of the collar, and fastening the mounting member to the mounted member. This is a blind rivet fastening method.

  Thereby, the step of fastening the blind rivet to the mounted member and the step of fastening the mounting member to the mounted member can be separated, and deformation of the mounted member can be prevented. Torque management at the time of attachment is not required, and the completion of fastening of the attachment member can be felt in response.

ADVANTAGE OF THE INVENTION According to this invention, the blind rivet which can attach a blind rivet and the attachment member easily with one process using a commercially available tool without using a fastening tool can be provided.
ADVANTAGE OF THE INVENTION According to this invention, the to-be-attached member does not deform | transform, the torque management at the time of fastening is not required, and the blind rivet which can feel fastening completion in response can be provided.
According to the present invention, when the bolt is tightened, the collar presses the mounting member against the mounted member, so that the pressing force of the blind rivet can be adjusted.
According to the present invention, by removing the bolt and the collar, it is possible to remove the mounting member from the mounted member while leaving the buckling nut on the mounted member, and the mounting member can be removed using the bolt and the collar. Reattachment is also possible.

It is a left view of the blind rivet of the 1st Embodiment of this invention. It is a front view of the blind rivet of FIG. It is sectional drawing along the AA line of FIG. 1 of the blind rivet of FIG. (a) is a left side view of the bolt of the blind rivet of FIGS. 1 to 3, and (b) is a front view with a part in cross section. (a) is a left side view of the washer of the blind rivet of FIGS. 1 to 3, and (b) is a front view partly in section. (a) is a left side view of the buckling nut of the blind rivet of FIGS. 1 to 3, (b) is a cross-sectional view taken along line BB of (a), and (c) is a right side view. is there. (a) is a left side view of the collar of the blind rivet of FIGS. 1 to 3, (b) is a front view with a part in cross section, and (c) is a right side view. It is sectional drawing of the intermediate | middle stage which fastens an attachment member to a to-be-attached member with the blind rivet of FIGS. It is sectional drawing after fastening an attachment member to a to-be-attached member with the blind rivet of FIGS. It is a left view of the blind rivet of the 2nd Embodiment of this invention. It is a front view of the blind rivet of FIG. It is sectional drawing along the AA line of FIG. 10 of the blind rivet of FIG. (a) is a left side view of the bolt of the blind rivet of FIGS. 10 to 12, and (b) is a front view with a part in cross section. (a) is the left view of the washer of the blind rivet of FIGS. 10-12, (b) is the front view which made a part a cross section. (a) is the left view of the sleeve of the blind rivet of FIGS. 10-12, (b) is the front view which made a part a cross section. (a) is a left view of the buckling nut of the blind rivet of FIGS. 10-12, (b) is sectional drawing along the BB line of (a). (a) is a left side view of the collar of the blind rivet of FIGS. 10 to 12, (b) is a front view with a part in cross section, and (c) is a right side view. It is sectional drawing of the intermediate | middle stage which fastens an attachment member to a to-be-attached member with the blind rivet of FIGS. It is sectional drawing after fastening an attachment member to a to-be-attached member with the blind rivet of FIGS.

(First embodiment)
Hereinafter, a blind rivet according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a left side view of a blind rivet according to a first embodiment of the present invention. FIG. 2 is a front view of the blind rivet of FIG. 3 is a cross-sectional view of the blind rivet of FIG. 1 along the line BB of FIG. 1, and shows a state in which the blind rivet is set in the mounting holes 52 and 53 of the mounted member 50 and the mounting member 51.
The blind rivet according to the first embodiment includes a bolt 10, a washer 20, a buckling nut 30, and a collar 40.

With reference to FIGS. 4-7, the volt | bolt 10, the washer 20, the buckling nut 30, and the collar 40 which comprise the blind rivet of the 1st Embodiment of this invention are demonstrated in order.
FIG. 4 (a) is a left side view of the bolt 10 used for the blind rivet of the first embodiment of the present invention, and FIG. 4 (b) is a front view partly in cross section.
The bolt 10 has a large-diameter flange 11 having an outer diameter 11D at one end, and a polygonal hole 12 is formed on the end surface of the flange 11. The polygonal hole 12 is a hexagon, but other numbers such as a tetragon may be used. The bolt 10 can be rotated by inserting a hexagon wrench or the like into the polygonal hole 12. Instead of forming the polygonal hole 12 in the flange 11 of the bolt 10, the outer shape of the flange 11 may be a polygon, or a part of the outer shape may be a plane and the outer shape of the flange 11 may be rotated with a spanner or the like. Good.

The bolt 10 has a cylindrical columnar portion 13 adjacent to the flange 11. The right side surface of the flange 11 in FIG. The outer diameter of the cylindrical portion 13 is 13D. The end surface of the cylindrical portion 13 opposite to the flange 11 is a flat stepped portion 14, the diameter of which becomes smaller from the stepped portion 14, and a cylindrical male screw portion 15 extends to the tip portion. The outer diameter of the male screw portion 15 is 15D. The male screw portion 15 has a male screw on the outer peripheral surface.
The bolt 10 is made of a metal such as steel or stainless steel.

  FIG. 5A is a left side view of the washer 20 used for the blind rivet according to the first embodiment of the present invention, and FIG. The washer 20 has a circular outer diameter, two end faces are flat, and a circular center hole 21 is formed at the center. The outer diameter 13D of the cylindrical portion 13 of the bolt 10 is larger than the inner diameter 21d of the center hole 21 of the washer 20, and smaller than the outer diameter 20D of the washer 20. When the bolt 10 is inserted into the washer 20 from the male screw portion 15, the stepped portion 14 comes into contact with the end face of the washer 20 and stops.

An inner diameter 31d of a through hole 35 of a polygonal head 31 of a buckling nut 30 described later is larger than an inner diameter 21d of a center hole 21 of the washer 20, and smaller than an outer diameter 20D of the washer 20. The washer 20 comes into contact with the end face of the polygonal head 31 of the buckling nut 30 and stops. At the stage of attaching the blind rivet, with the washer 20 supported by the end face of the polygonal head 31 of the buckling nut 30, a part of the cylindrical portion 13 of the bolt 10 enters the through hole 35 of the buckling nut 30, The washer 20 is sheared into the outer portion 22 and the inner portion 23 by the stepped portion 14 of the bolt 10 and the end face of the polygonal head portion 31 of the buckling nut 30.
The washer 20 is made of a metal material that can be sheared by the stepped portion 14 of the bolt 10 and the end face of the polygonal head 31 of the buckling nut 30.

  FIG. 6A is a left side view of the buckling nut 30 used for the blind rivet of the first embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along line AA in FIG. (C) is a right side view. The buckling nut 30 has a polygonal head 31 at one end. The polygonal head 31 has a hexagonal outer shape, but may have other angles such as a quadrangle. The maximum diameter (distance between vertices) of the polygonal head 31 is 31D. A through hole 35 is formed from the polygonal head 31 through the tubular portion 33 to the female screw portion 34. The inner diameter 31d of the through-hole 35 in the polygonal head 31 portion is larger than the inner diameter 21d of the center hole 21 of the washer 20 and smaller than the outer diameter 20D of the washer 20. The washer 20 is a polygonal head of the buckling nut 30. It comes into contact with the end face of 31 and stops.

  The buckling nut 30 is adjacent to the polygonal head 31 and has a stepped portion 32 whose outer diameter is reduced to form a cylindrical tubular portion 33. The inner diameter 33d of the through hole in the tubular portion 33 is slightly smaller than the inner diameter 31d of the through hole 35 in the polygonal head 31 portion. The inner diameter 33d of the through hole 35 in the tubular portion 33 is larger than the outer diameter 15d of the male screw portion 15 of the bolt 10, and the male screw portion 15 can be inserted. The tubular portion 33 is buckled and expanded in diameter, and used to attach to the attached member 50. The portion of the tubular portion 33 whose diameter is increased is heat treated to be deformable.

The maximum diameter 31D of the polygonal head 31 is smaller than the inner diameter of the mounting hole 53 of the mounting member 51, and the polygonal head 31 can enter the mounting hole 53 of the mounting member 51. The maximum diameter 31D of the polygonal head 31 is larger than the inner diameter of the mounting hole 52 of the mounted member 50 and cannot enter the mounting hole 52 of the mounted member 50.
When the buckling nut 30 is inserted into the mounting hole 52 of the mounted member 50, the stepped portion 32 of the buckling nut 30 enters the mounting hole 53 of the mounting member 51 and around the mounting hole 52 of the mounted member 50. It comes into contact with the surface and stops.
The outer diameter 33D of the tubular portion 33 is smaller than the inner diameter of the mounting hole 53 of the mounting member 51 and smaller than the inner diameter of the mounting hole 52 of the mounted member 50, and can be inserted into the mounting holes 52 and 53.

  The buckling nut 30 has a cylindrical female thread portion 34 adjacent to the tubular portion 33. The outer diameter of the female thread portion 34 is the same as the outer diameter 33D of the tubular portion 33. The internal diameter of the internal thread portion 34 is smaller than the internal diameter of the tubular portion 33, and an internal thread 36 is formed on the inner surface. The internal thread of the internal thread 36 can be engaged with the external thread of the external thread portion 15 of the bolt 10.

FIG. 7A is a left side view of the collar 40 used in the blind rivet according to the first embodiment of the present invention, FIG. 7B is a front view with a partial cross section, and FIG. FIG.
The collar 40 has a polygonal portion 41 on the left side of FIG. The polygonal portion 41 is hexagonal, but it can be other numbers such as a quadrangular shape. The outer shape of the polygonal portion 41 can be fixed with a spanner or the like. Or the external shape of the polygonal part 41 should just be a shape which can be fixed with a spanner etc., such as making a part of circumferential surface into a plane even if it is not a polygon.

In addition, a circular circular hole 43 is formed in the polygonal portion 41. The inner diameter 43d of the circular hole 43 is slightly larger than the outer diameter 13d of the cylindrical cylindrical portion 13 of the bolt 10, and can accommodate the cylindrical portion 13.
When the installation of the blind rivet is completed, the cylindrical portion side end surface 16 of the flange 11 of the bolt 10 contacts the polygonal portion side end surface 45 of the collar 40 on the left side view of FIG.

  The collar 40 has a short cylindrical cylindrical portion 42 having an outer diameter slightly larger than that of the polygonal portion 41 on the right side of FIG. The outer diameter 42D of the cylindrical portion 42 is larger than the inner diameter of the mounting hole 53 of the mounting member 51, and the cylindrical portion 42 comes into contact with the surface around the mounting hole 53 of the mounting member 51 and stops.

Further, a polygonal hole 44 having a polygonal cross section is formed adjacent to the circular hole 43 up to the cylindrical part side end face 46. The polygonal hole 44 is sized to match the polygonal head 31 of the buckling nut 30. The maximum diameter (distance between vertices) 44d of the polygonal hole 44 is slightly larger than the maximum diameter 31D of the polygonal head 31.
When the polygonal head 31 of the buckling nut 30 is accommodated in the polygonal hole 44 of the collar 40, the buckling nut 30 is held against the collar 40 so as not to rotate.
The collar 40 is made of a metal such as steel or stainless steel.

The attached member 50 is a lower plate such as an automobile panel, and the attachment member 51 is a member attached to the attached member 50. The mounting member 51 is disposed on the work side (left side in FIG. 3) with respect to the mounted member 50.
The inner diameter of the mounting hole 53 of the mounting member 51 is larger than the inner diameter of the mounting hole 52 of the mounted member 50.

The inner diameter of the mounting hole 52 of the mounted member 50 is slightly larger than the outer diameter 33D of the tubular portion 33 of the buckling nut 30 and smaller than the outer diameter 31D of the polygonal head 31, and the tubular portion 33 of the buckling nut 30 is When inserted, the step 32 of the polygonal head 31 abuts and stops.
The inner diameter of the mounting hole 53 of the mounting member 51 is larger than the outer diameter 31D of the polygonal head 31 of the buckling nut 30. The inner diameter of the mounting hole 53 of the mounting member 51 is smaller than the outer diameter 42D of the cylindrical portion 42 of the collar 40, and the cylindrical portion side end surface 46 of the cylindrical portion 42 of the collar 40 is on the surface around the mounting hole 53 of the mounting member 51. Abut.

Returning to FIGS. 1 to 3, the assembled state of the bolt 10, the washer 20, the buckling nut 30, and the collar 40 that are the components of the blind rivet will be described. The right side of FIG. 3 is the blind side, and the left side is the work side. The mounted member 50 is disposed on the blind side and the mounting member 51 is disposed on the work side, and the blind rivet is mounted from the left work side.
The male screw portion 15 of the bolt 10 is inserted into the circular hole 43 of the collar 40 from the side of the polygonal portion side end surface 45. The collar 40 stops when the polygonal portion side end surface 45 abuts on the columnar side end surface 16 of the flange 11 of the bolt 10.

The male screw portion 15 of the bolt 10 is inserted into the center hole 21 of the washer 20. The washer 20 enters the polygonal hole 44 of the collar 40 and stops after coming into contact with the step 14 of the bolt 10.
Insert the bolt 10 into the buckling nut 30, fix the outer shape of the polygonal portion 41 of the collar 40 with a spanner, etc., insert a hexagon wrench etc. into the polygonal hole 12 of the bolt 10, and rotate the bolt 10 Then, the male screw portion 15 of the bolt 10 is engaged with the female screw portion 34 of the buckling nut 30 halfway. At this time, the polygonal head 31 of the buckling nut 30 is held so as not to rotate within the polygonal hole 44 of the collar 40.

The mounting hole 52 and the mounting member 51 of the mounted member 50 are overlapped so that the mounting hole 52 of the mounted member 50 and the mounting hole 53 of the mounting member 51 are positioned.
The blind rivet assembled as described above is inserted into the mounting hole 52 of the mounted member 50 and the mounting hole 53 of the mounting member 51 from the mounting member 51 side. The step 32 of the buckling nut 30 comes into contact with the surface around the mounting hole 52 of the mounted member 50 and stops. The collar 40 is held around the cylindrical portion 13 of the bolt 10 so as to be movable between the surface around the mounting hole 53 of the mounting member 51 and the cylindrical portion side end surface 16 of the flange 11 of the bolt 10. .

With reference to FIGS. 8-9, the operation | movement which fastens the attachment member 51 to the to-be-attached member 50 with the blind rivet of the 1st Embodiment of this invention of FIG. 2 is demonstrated.
FIG. 8 is a cross-sectional view showing an intermediate stage in which the mounting member 51 is fastened to the mounted member 50 by blind rivets. Fix the outer shape of the polygonal part 41 of the collar 40 with a wrench, etc., insert a hexagon wrench etc. into the polygonal hole 12 of the bolt 10, rotate the bolt 10, and tighten the male threaded part 15 of the bolt 10 to the buckling nut Further engagement is made with the 30 female thread portions 34. At this time, the polygonal head 31 of the buckling nut 30 is held so as not to rotate within the polygonal hole 44 of the collar 40. The tubular portion 33 of the buckling nut 30 is compressed in the axial direction by the flange 11 of the bolt 10 and the female thread portion 34 of the buckling nut 30 and buckled. Go. The enlarged diameter portion 37 abuts around the attachment hole 52 of the attached member 50. The attached member 50 is sandwiched and fixed between the polygonal head 31 and the enlarged diameter portion 37 of the buckling nut 30.
The force required to shear the washer 20 is greater than the force required to expand the tubular portion 33 of the buckling nut 30. Therefore, at the stage of expanding the diameter of the tubular portion 33, the washer 20 stays between the stepped portion 14 of the bolt 10 and the end face of the polygonal head 31, and is not sheared. This completes the mounting of the blind rivet to the mounted member 50.

FIG. 9 is a cross-sectional view showing a stage where the fastening operation is completed. When the male screw portion 15 of the bolt 10 is further engaged with the female screw portion 34 of the buckling nut 30 from the stage of FIG. 8, the washer 20 is moved to the outer portion by the step 14 of the bolt 10 and the end face of the polygonal head 31. 22 and the inner part 23 are sheared. The outer portion 22 remains on the end face of the polygonal head 31 of the buckling nut 30, and the inner portion 23 is pushed into the through hole 35 of the polygonal head 31 of the buckling nut 30. A part of the cylindrical portion 13 of the bolt 10 enters the through hole 35 of the buckling nut 30. When the washer 20 is sheared, the tightening torque for engaging the bolt 10 once approaches zero. Further, when the bolt 10 is engaged, the cylindrical portion side end surface 16 of the bolt 10 comes into contact with the polygonal portion side end surface 45 of the collar 40, and the tightening torque suddenly increases. At this time, the mounting member 51 is pressed and fixed to the mounted member 50 by the cylindrical portion side end surface 46 of the collar 40.
Thus, the mounting of the mounting member 51 to the mounted member 50 is completed by the blind rivet.

According to the first embodiment of the present invention, the step of buckling the tubular portion 33 of the buckling nut 30 and attaching it to the attached member 50 in one operation of tightening the bolt 10, and the washer After breaking 20, the step of attaching the attachment member 51 to the attachment member 50 by the collar 40 can be separated.
Therefore, deformation of the attached member 50 can be prevented.
In addition, the sudden increase in the tightening torque makes it possible to feel the completion of the installation of the blind rivet and know the completion of the installation.
Further, since the washer 20 is sheared by the bolt 10, there is no possibility that the buckling nut 30 is deformed when the washer 20 is sheared.
Further, by adjusting the tightening force of the bolt 10, the pressing force of the blind rivet can be adjusted.
By removing the bolt 10 and the collar 40, it is possible to remove the mounting member 51 from the mounted member 50 while leaving the buckling nut 30 on the mounted member 50. Also, the bolt 10 and the collar 40 are used for mounting. The member 51 can be reattached.

In the first embodiment of the present invention, the inner diameter of the mounting hole 53 of the mounting member 51 is larger than the inner diameter of the mounting hole 52 of the mounted member 50.
The inner diameter of the mounting hole 53 of the mounting member 51 is the same as or close to the inner diameter of the mounting hole 52 of the mounted member 50, and the inner diameter of the mounting hole 53 of the mounting member 51 is the polygonal head 31 of the buckling nut 30. The outer diameter can be smaller than 31D. In this way, the stepped portion 32 of the buckling nut 30 can be brought into contact with the surroundings of the mounting hole 53 of the mounting member 51, and the tubular portion 33 can be buckled to be simultaneously mounted on the mounting member 51 and the mounted member 50. .

(Second Embodiment)
Next, a blind rivet according to the second embodiment of the present invention will be described. The blind rivet according to the second embodiment includes a sleeve 60 in addition to the bolt 10, which is a component of the blind rivet according to the first embodiment, the washer 20, the buckling nut 30, and the collar 40. In the second embodiment, the same components and parts as those in the first embodiment are indicated using the same reference numerals as in the first embodiment.
FIG. 10 is a left side view of the blind rivet according to the second embodiment of the present invention. FIG. 11 is a front view of the blind rivet of FIG. FIG. 12 is a cross-sectional view of the blind rivet of FIG. 10 along the line AA in FIG. 10 and shows a state in which the blind rivet is set in the mounting holes 52 and 53 of the mounted member 50 and the mounting member 51.
In the first embodiment, the washer 20 is supported by the buckling nut 30 and sheared by the bolt 10. In the second embodiment, the collar 40 is provided with a stepped portion 48, the washer 20 is supported by the sleeve 60 held by the buckling nut 30, and the washer 20 is sheared by the stepped portion 48 of the collar 40.

With reference to FIGS. 13 to 17, the bolt 10, the washer 20, the buckling nut 30, the sleeve 60, and the collar 40 constituting the blind rivet according to the second embodiment of the present invention will be described in order. Differences from the blind rivet of the first embodiment will be mainly described, and description of the same points will be omitted.
FIG. 13 (a) is a left side view of the bolt 10 used in the blind rivet of the second embodiment of the present invention, and FIG. 13 (b) is a front view with a part in cross section.
In the bolt 10, the cylindrical portion 13 is narrower and longer than the bolt 10 of the first embodiment, and the outer diameter 13D of the cylindrical portion 13 is the same as the outer diameter 15D of the male screw portion 15.

FIG. 14 (a) is a left side view of the washer 20 used for the blind rivet of the second embodiment of the present invention, and FIG. 14 (b) is a front view partly in cross section. The washer 20 of the second embodiment has the same shape as the washer 20 of the first embodiment.
The inner diameter 21d of the center hole 21 of the washer 20 is large enough to allow the male threaded portion 15 of the bolt 10 and the cylindrical portion 13 to pass through.

  FIG. 15A is a left side view of the sleeve 60 used for the blind rivet according to the second embodiment of the present invention, and FIG. In the second embodiment, a sleeve 60 is used. The sleeve 60 is a cylindrical member in which a central hole 61 is formed. The outer diameter 60D of the sleeve 60 is smaller than the outer diameter 20D of the washer 20, and the inner diameter 61d of the sleeve 60 is substantially equal to the inner diameter 21d of the center hole 21 of the washer 20. The washer 20 comes into contact with the end surface of the sleeve 60 and stops. The sleeve 60 holds the washer 20 when the washer 20 is sheared.

The outer diameter 60D of the sleeve 60 is sized to fit the inner diameter 31d of the through-hole 35 of the polygonal head portion 31 of the buckling nut 30, and is larger than the inner diameter 33d of the tubular portion 33 of the buckling nut 30. The sleeve 60 enters the through hole 35 of the polygonal head portion 31 and comes into contact with the end surface of the through hole 35 of the tubular portion 33 to stop.
The washer 20 comes into contact with the end surface of the sleeve 60 and stops.

  FIG. 16A is a left side view of a buckling nut 30 used for the blind rivet according to the second embodiment of the present invention, and FIG. 16B is a cross-sectional view taken along line BB in FIG. is there. The buckling nut 30 of the second embodiment has the same shape as the buckling nut 30 of the first embodiment.

FIG. 17 (a) is a left side view of the collar 40 used for the blind rivet of the second embodiment of the present invention, (b) is a front view with a partial cross section, and (c) is the right side. FIG.
In the collar 40 of the second embodiment, a second circular hole 47 is formed adjacent to the circular circular hole 43. The inner diameter 47 d of the second circular hole 47 is larger than the inner diameter 43 d of the circular hole 43. The inner diameter 47d of the second circular hole 47 is smaller than the outer diameter 20D of the washer 20, and larger than the inner diameter 20d of the washer 20. The washer 20 comes into contact with the stepped portion 48 between the second circular hole 47 and the polygonal hole 44 and stops.

Returning to FIGS. 10 to 12, the assembled state of the bolt 10, the washer 20, the sleeve 60, the buckling nut 30, and the collar 40 which are the components of the blind rivet will be described.
The male screw portion 15 of the bolt 10 is inserted into the circular hole 43 of the collar 40 from the side of the polygonal portion side end surface 45.
The male screw portion 15 of the bolt 10 is inserted into the center hole 21 of the washer 20. The washer 20 enters the polygonal hole 44 of the collar 40 and stops by contacting the stepped portion 48 of the second circular hole 47.
The sleeve 60 is inserted into the through hole 35 of the polygonal head 31 of the buckling nut 30. The sleeve 60 comes into contact with a step portion at the boundary between the polygonal head portion 31 and the tubular portion 33 and stops.
Insert the bolt 10 into the buckling nut 30, fix the outer shape of the polygonal portion 41 of the collar 40 with a spanner, etc., insert a hexagon wrench etc. into the polygonal hole 12 of the bolt 10, and rotate the bolt 10 The male screw part 15 of the bolt 10 is engaged with the female screw part 34 of the buckling nut 30 until the collar 40, the washer 20 and the sleeve 60 are held without moving between the bolt 10 and the buckling nut 30. deep. At this time, the polygonal head 31 of the buckling nut 30 is held so as not to rotate within the polygonal hole 44 of the collar 40.

The mounting hole 52 and the mounting member 51 of the mounted member 50 are overlapped so that the mounting hole 52 of the mounted member 50 and the mounting hole 53 of the mounting member 51 are positioned.
The blind rivet assembled as described above is inserted into the mounting hole 52 of the mounted member 50 and the mounting hole 53 of the mounting member 51 from the mounting member 51 side. The step 32 of the buckling nut 30 comes into contact with the surface around the mounting hole 52 of the mounted member 50 and stops.

With reference to FIGS. 18-19, the operation | movement which fastens the attachment member 51 to the to-be-attached member 50 with the blind rivet of the 2nd Embodiment of this invention of FIG. 12 is demonstrated.
FIG. 18 is a cross-sectional view showing an intermediate stage in which the mounting member 51 is fastened to the mounted member 50 by blind rivets. Fix the outer shape of the polygonal part 41 of the collar 40 with a wrench, etc., insert a hexagon wrench etc. into the polygonal hole 12 of the bolt 10, rotate the bolt 10, and tighten the male threaded part 15 of the bolt 10 to the buckling nut Further engagement is made with the 30 female thread portions 34. Then, the tubular portion 33 of the buckling nut 30 is compressed in the axial direction by the flange 11 of the bolt 10 and the female screw portion 34 of the buckling nut 30 and buckled. It will be done. The enlarged diameter portion 37 abuts around the attachment hole 52 of the attached member 50. The attached member 50 is sandwiched and fixed between the polygonal head 31 and the enlarged diameter portion 37 of the buckling nut 30.
The force required to shear the washer 20 is greater than the force required to expand the tubular portion 33 of the buckling nut 30. Therefore, the washer 20 stays between the stepped portion 48 of the collar 40 and the end surface of the sleeve 60 and is not sheared. This completes the mounting of the blind rivet to the mounted member 50.

FIG. 19 is a cross-sectional view showing a stage where the fastening operation is completed. When the male threaded portion 15 of the bolt 10 is further engaged with the female threaded portion 34 of the buckling nut 30 from the stage shown in FIG. And sheared. The inner portion 23 remains on the end face of the sleeve 60 and is pushed into the second circular hole 47 of the collar 40, and the outer portion 22 remains outside the sleeve 60 and on the inner portion of the polygonal hole 44 of the collar 40. A part of the sleeve 60 enters the second circular hole 47 of the collar 40. When the washer 20 is sheared, the tightening torque for engaging the bolt 10 once approaches zero. Further, when the bolt 10 is engaged, the cylindrical portion side end face 46 of the collar 40 abuts around the attachment hole 53 of the attachment member 51, and the tightening torque suddenly increases. At this time, the mounting member 51 is pressed and fixed to the mounted member 50 by the cylindrical portion side end surface 46 of the collar 40.
Thus, the mounting of the mounting member 51 to the mounted member 50 is completed by the blind rivet.

According to the second embodiment, as in the first embodiment, the step of attaching the blind rivet to the attached member 50, and after the washer 20 is broken, the attachment member 51 is attached to the attached member 50 by the collar 40. The mounting step can be separated, and the same effect as in the first embodiment can be obtained.
Since the washer 20 is sheared by the sleeve 60, there is no fear that the buckling nut 30 is deformed when the washer 20 is sheared.

  Also in the second embodiment, as in the first embodiment, the inner diameter of the mounting hole 53 of the mounting member 51 is the same as or close to the inner diameter of the mounting hole 52 of the mounted member 50. The stepped portion 32 can be brought into contact with the mounting hole 53 of the mounting member 51 to buckle the tubular portion 33 so that the blind rivet can be mounted to the mounting member 51 and the mounted member 50 simultaneously.

10 volts
11 Flange
12 Polygonal holes
13 Cylinder
14 steps
15 Male thread
16 End face of cylinder
20 Washer
21 Center hole
22 Outer part
23 Inner part
30 Buckling nut
31 Polygon head
32 steps
33 Tubular section
34 Female thread
35 Through hole
36 Female thread
37 Expanded part
40 colors
41 Polygon part
42 Cylindrical part
43 round holes
44 Polygonal holes
45 Polygon side edge
46 Cylindrical end face
47 Second circular hole
48 steps
50 Mounted member
51 Mounting member
52 Mounting hole
53 Mounting hole
60 sleeves
61 Central hole

Claims (10)

A blind rivet for fastening an attachment member in which an attachment hole is formed to a member to be attached in which an attachment hole is formed,
A bolt having a large-diameter flange, a cylindrical portion adjacent to the flange, and a male screw portion adjacent to the cylindrical portion;
A collar formed with a circular hole through which the cylindrical portion of the bolt passes, and a polygonal hole adjacent to the circular hole;
A polygonal head that can be held so as not to rotate in the polygonal hole of the collar, a tubular portion that is adjacent to the polygonal head and can be expanded in diameter, and an external thread portion of the bolt that is adjacent to the tubular portion. A buckling nut having a female thread portion that can be engaged with the through-hole,
A blind rivet comprising: a shearable washer that can be accommodated inside the polygonal hole of the collar around the cylindrical portion of the bolt. The blind rivet according to claim 1,
The cylindrical portion of the bolt is inserted into the circular hole of the collar,
The washer is disposed around the bolt in the polygonal hole of the collar;
A blind rivet assembled so that the male threaded portion of the bolt engages the female threaded portion of the buckling nut. The blind rivet according to claim 2, wherein
The washer is a blind rivet that is sheared between a stepped portion of the cylindrical portion of the bolt and an end surface of the polygonal head of the buckling nut. The blind rivet according to claim 1,
And a cylindrical sleeve having an inner diameter larger than the outer diameter of the cylindrical portion of the bolt and an outer diameter matching the inner diameter of the through hole of the polygonal head portion of the buckling nut,
The collar is a blind rivet in which a second circular hole having an inner diameter larger than the inner diameter of the circular hole is formed between the circular hole and the polygonal hole. The blind rivet according to claim 4,
The cylindrical portion of the bolt is inserted into the circular hole of the collar,
The washer is disposed around the bolt in the polygonal hole of the collar;
The sleeve is disposed in the through-hole of the polygonal head portion of the buckling nut, and the washer is adjacent to the sleeve;
A blind rivet assembled so that the male threaded portion of the bolt engages the female threaded portion of the buckling nut. The blind rivet according to claim 5,
The washer is a blind rivet that is sheared by a step portion of the second circular hole of the collar and an end surface of the sleeve. The blind rivet according to any one of claims 1 to 6,
A blind rivet in which a polygonal hole having an inner shape for inserting a tool is formed on an end face of the flange of the bolt. The blind rivet according to any one of claims 1 to 7,
The collar is a blind rivet having a polygonal portion whose outer shape is a polygon in order to be fixed with a tool. The blind rivet according to claim 7 or 8,
The polygon is a hexagonal blind rivet. A method for fastening a blind rivet according to any one of claims 2 to 6,
Align the mounting hole of the mounting member and the mounting hole of the mounted member,
The assembled blind rivet is inserted into the mounting hole of the mounting member and the mounting hole of the mounted member from the mounting member side,
Abutting the polygonal head of the buckling nut against the surface around the mounting hole of the mounted member;
The collar is fixed, the bolt is rotated, and the male screw portion of the bolt is further engaged with the female screw portion of the buckling nut,
The diameter of the tubular portion of the buckling nut is expanded, and a mounting member is fastened between the polygonal head of the buckling nut and the tubular portion,
The bolt is further rotated, the male threaded portion of the bolt is further engaged with the female threaded portion of the buckling nut, and the washer is sheared,
The flange of the bolt includes a step of pressing one end surface of the collar, pressing the mounting member against the mounted member with the other end surface of the collar, and fastening the mounting member to the mounted member. How to fasten blind rivets.

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