TW201708720A - Fastening tool, fastening structure and fastening method not getting loosening during the use after being fastened - Google Patents

Abstract

The present invention relates to a fastening tool and a fastening structure that do not get loosening during the use after being fastened and allow for easy removal after being fastened. A fastening tool (1), which is used to fasten a plurality of components-to-be mounted (71, 72) having mounting holes (73, 74), comprises an axle (10). The axle comprises an angled section (12) having a cross-section that is an angled configuration; an external thread section (13), which is formed with an external thread; an engagement section (15), which is formed with a circumferential groove for engaging a collar; a breakable section (16), which is breakable when being acted upon by a tensile force that is greater than a predetermined level; and a holding section (17) that is held by a holding member of the fastening device. The fastening tool further comprises: the collar (20), which is formed with a through hole (23) having an inside diameter greater than an outer shape of the engagement section (15); a nut (30), which is screwable onto the external thread section; and a cap (40, 50), which functions to hold the nut in a manner of being not rotatable with respect to the axle. A recess (11a) is formed adjacent to the angled section (12) of the axle and a retention ring (60) that is fit in the recess is included such that the retention ring holds the cap in a manner of being not detached from the axle.

Description

Fastener, fastening structure and fastening method

The present invention relates to a fastener, a fastening structure and a fastening method having a shaft and a collar. In particular, it relates to a fastener, a fastening structure and a fastening method which are not loosened during use and can be easily removed.

Previously, as a fastener for fastening a member to be fastened, it is known to have a shaft having a head and an elongated shaft portion extending from the head; and a collar having a flange and a cylinder extending from the flange Department of fasteners. When the fastener is fastened, the shaft portion of the shaft is passed through the mounting hole of the member to be fastened, the head portion is brought into contact with the surface around the mounting hole of the member to be mounted, and the collar is disposed around the shaft portion of the shaft. The caulking member of the fastening tool is used to stretch the shaft portion of the shaft protruding from the collar with the holding member, and the cylindrical portion of the collar is twisted from the outer circumference, and the inner circumferential surface of the collar is engaged with the shaft portion of the shaft. The rupturable portion having a relatively small diameter of the shaft portion is broken, and the fastened member is fastened between the head of the shaft and the rim of the collar.

When the fastener is riveted (screwed), the inner surface of the collar is pressed and fastened by pressing the inner surface of the collar against the circumferential groove (parallel groove) of the shaft, so that it is not necessary to machine the internal thread in advance on the inner circumference of the collar. Or the circumferential groove does not require the tight dimensional accuracy of the collar. Therefore, the member to be mounted can be fastened at low cost.

However, because of the tightening of the collar, the collar must be made of a material that is more easily deformable than the shaft.

Further, when the collar is screwed and engaged with the circumferential groove of the shaft, the collar cannot be removed from the shaft after fastening, and the member to be attached cannot be removed.

Patent Document 1 discloses a fixing member including a shaft having a head portion and an elongated shaft portion, and a collar. A recess for stretching the shaft is formed on the far side from the head of the shaft. A combined recessed portion for combining the fixing recess (circumferential groove) and the breaking recess (breakable portion) is formed on the head side of the shaft. The collar is deformed and pressed into the recess of the shaft, and the shaft is broken in the recess for fracture, and a fixing piece (attached member) is fixed between the collars of the shaft.

Patent Document 1 is an invention in which heat treatment is performed after the shaft is formed, and the shaft is formed into a desired structure, and the concave portion for fracture is surely broken.

The fixing member of Patent Document 1 can be screwed to the collar and engaged with the recess of the shaft, and the fixing piece is fastened between the head of the shaft and the collar.

However, since the fixing member of Patent Document 1 is screwed from the outer circumference, the collar must be formed of a softer material than the shaft. Further, since the collar is twisted by the member of the drawing tool having a circular cross section, the cross section of the tightened collar is circular. Therefore, there is a problem that the above-mentioned problem cannot be removed by using a tool to rotate the fixing piece after fastening.

Patent Document 2 discloses a method of fastening a member to be fastened by providing a threaded member (bolt) other than a head portion and a shaft portion and a belt sleeve (a collar). The externally threaded member has a head portion, a threaded portion adjacent to the outside of the head portion, a threaded portion for tool engagement on the distal end side, and an intermediate shaft portion between the externally threaded portion and the threaded portion for tool engagement. The belt sleeve has a cylindrical portion having a crotch portion and an outer diameter slightly larger than the outer diameter of the thread of the outer threaded portion of the externally threaded member. The rivet sleeve is crimped to the member to be fastened by the staking of the tool, and the cylindrical portion is welded to the threaded portion other than the externally threaded member. The cross section of the die hole of the riveting die of the riveting tool is polygonal. When the threading portion of the tool engagement is pushed by the pulling tool of the riveting tool, the riveting die presses the tape sleeve to the member to be fastened, and the cylindrical portion is clamped to the die hole, and the inner surface of the cylindrical portion corresponds to The internal thread of the male screw portion and the outer surface of the cylindrical portion serve as a polygonal portion for the engagement of the rotary tool. After the riveting process, the male screw member is cut at the small diameter portion.

In the riveting process, Patent Document 2 has an internal thread formed on the inner surface of the cylindrical portion of the tape sleeve and a polygonal portion on the outer surface. Therefore, after the member to be mounted is fastened, the polygonal portion can be rotated by the tool to be detachable. The component is installed. It is not necessary to form an internal thread or a polygonal portion by cold working or the like in advance, and it is possible to reduce the cost.

However, in Patent Document 2, since it is deformed when the tape is fastened, it is necessary to use a material which is more deformable than the externally threaded member. Further, since the polygonal portion is formed by deformation when the tape is fastened, the polygonal portion of the outer surface has low dimensional accuracy. When the ferrule sleeve is removed after fastening, there is a flaw in the outer surface of the polygonal portion.

Therefore, a fastener, a fastening structure, and a fastening method that do not come loose during use after fastening the member to be mounted are sought. Further, a fastener, a fastening structure, and a fastening method which can be easily removed after fastening are sought.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 60-8518

[Patent Document 2] Japanese Patent Laid-Open No. Hei 7-167122

Accordingly, it is an object of the present invention to provide a fastener, fastening structure and fastening method that are not released during use after fastening.

Another object of the present invention is to provide a fastener, a fastening structure and a fastening method which can be easily removed after fastening.

In order to achieve the object, the fastener of the present invention is configured such that the nut is engaged with the threaded portion of the shaft, and the cap is placed on the angled portion of the nut and the shaft to form a shaft assembly, and the shaft assembly is inserted into the mounting hole of the mounted member. The collar is capped to the engaging portion of the shaft protruding from the mounting hole, and the collar is screwed from the outside to be engaged with the engaging portion of the shaft, and is fastened by the collar and the nut. Pieces.

Aspects 1 to 3 of the present invention correspond to the first and second embodiments. The first aspect relates to the fastener, the second aspect relates to the fastening structure, and the third aspect relates to the fastening method.

The first aspect of the present invention (claims 1 to 7) is a fastener (first and second embodiments), which is characterized in that it is used to fasten a plurality of mounted members having mounting holes, and includes a shaft comprising: an angled portion having an angular shape; an externally threaded portion formed with an external thread; a engaging portion for engaging the collar; and a breakable portion for a specific tensile force And a retaining portion for holding by the holding member of the fastening tool; the collar is formed with a through hole having an inner diameter larger than the outer portion of the engaging portion; the nut is screwed to the outer portion a threaded portion; and a cap for holding the nut in a manner that does not rotate about the shaft.

If the nut is screwed to the outside of the shaft, the cap keeps the nut in a manner that does not rotate about the shaft, and the nut does not loosen the shaft.

Moreover, it is easy to remove the cap after tightening, and it is removed by screwing the nut screwed to the outside of the shaft.

Preferably, the cap includes a corner hole that engages with the angular portion of the shaft, and a nut engagement hole that engages with the nut (first embodiment).

If the cap includes: a corner hole, which is engaged with the angular portion of the shaft; and a nut engaging hole that is engaged with the nut, the corner hole is engaged with the angular portion of the shaft, and the nut engaging hole is engaged with the nut. Therefore, the nut is held in such a way that it does not rotate about the shaft.

The cross-section of the angular portion of the shaft is quadrangular, and the cross-section of the corner hole of the cap is preferably also quadrangular.

Preferably, the cap includes a protruding portion that is engaged with the angular portion of the shaft and protrudes toward one side of the planar portion, and a bent portion that is engaged with the nut and faces the flat portion The other side is protruded (second embodiment).

If the cap includes: a protruding portion that protrudes toward one side of the flat portion; and a bent portion that protrudes toward the other side of the flat portion, the protruding portion of the cap engages with the angular portion of the shaft The bent portion of the cap is engaged with the nut, so the nut is surely held in such a manner that the shaft does not rotate.

Preferably, the shaft is formed with a recess adjacent to the angular portion, and the fastener further includes a retaining ring (first and second) that can be fitted to the recess so as not to be detached from the shaft. Implementation form).

If the recess is formed in the shaft and the fastener further includes a buckle that is fitted to the recess, the cap is held in such a manner that it is not easily detached.

Preferably, the engaging portion of the shaft is formed with a circumferential groove on the outer circumference (first and second embodiments).

When the circumferential groove is formed on the outer circumference of the engaging portion of the shaft, the twistable collar is engaged with the engaging portion and fixed.

Further, the engaging portion of the shaft may have an external thread formed on the outer circumference.

When the external thread is formed on the outer circumference of the engaging portion of the shaft, the screwing collar is engaged with the engaging portion to form an internal thread corresponding to the external thread, so that the collar can be rotated and removed after tightening.

Preferably, the collar has a cylindrical cylindrical portion and a slope portion which is adjacent to the cylindrical portion and has an outer diameter which is tapered.

If the collar has a slanted surface portion whose outer diameter is tapered, the twisting member of the fastening tool can be easily twisted, and the inner surface of the collar can be easily engaged with the engaging portion.

A second aspect of the present invention (claims 8 to 11) is a fastening structure characterized in that a plurality of members to be mounted having fastening holes are fastened by fasteners, and includes: a shaft, which is The fracture portion is broken and has: an angular portion having an angular shape; an externally threaded portion formed with an external thread; and an engaging portion for engaging the collar; a nut screwable to the external thread portion; a cap that holds the nut in a manner that does not rotate about the shaft; and The collar is engaged with the outer peripheral portion of the engaging portion, and the member to be mounted is fastened between the collar and the nut.

Preferably, the cap includes a corner hole that engages with the angular portion of the shaft, and a nut engagement hole that engages with a peripheral portion of the nut (first embodiment).

Preferably, the cap includes a protruding portion that is engaged with the angular portion of the shaft and protrudes on one side of the flat portion, and a bent portion that is engaged with the outer peripheral portion of the nut and formed on the flat portion The other side (second embodiment).

Preferably, the shaft is formed with a concave portion adjacent to the angular portion, and a buckle is fitted to the concave portion to hold the buckle so that the cap does not fall off from the shaft (first and second embodiments).

A third aspect of the present invention (claim 12) is a fastening method (first embodiment and second embodiment), characterized in that a plurality of members to be mounted having fastening holes are fastened by fasteners, and The method includes the following steps: a) preparing a fastener, comprising: a shaft having: an angular portion having an angular shape; an external thread portion formed with an external thread; and a engaging portion for engaging the collar; a breaking portion that is broken if there is a specific tensile force or more; and a holding portion for holding by a holding member of the fastening tool; and the collar formed with an inner diameter smaller than the engaging portion a larger through hole; a nut that can be screwed to the external thread portion; and a cap for holding the nut in a manner that does not rotate the shaft; b) inserting the nut from the front end side of the shaft, The nut is screwed to the male screw portion, and the cap is placed on the outer circumference of the nut and the angular portion of the shaft to form a shaft assembly, and c) the shaft assembly is inserted with the rear end of the shaft as a front end The above mounting hole of the above-mentioned mounted member will be on The nut is attached to the abutment member, The collar is disposed on the outer circumference of the engaging portion of the shaft so that the surface of the collar abuts against the mounting hole of the mounting member, and d) supports the collar and is pulled from the rear end side The holding portion of the shaft is screwed to the outer circumference of the collar to engage with the engaging portion of the shaft, and the shaft is broken at the breakable portion, and the shaft is fastened between the collar and the nut. member.

The shaft assembly to which the nut and the cap are attached to the shaft is inserted into the mounting hole of the mounted member, and the collar is screwed to engage with the engaging portion of the shaft protruding from the mounting hole, and the shaft is broken at the breakable portion. The mounted member can be easily fastened.

The fourth to sixth aspects of the present invention correspond to the third embodiment. The fourth aspect relates to the fastener, the fifth aspect relates to the fastening structure, and the sixth aspect relates to the fastening method.

A fourth aspect of the present invention (claim 13) is a fastener (third embodiment) characterized in that it is used for fastening a plurality of mounted members having mounting holes, and includes: a shaft having The external thread portion is formed with an external thread on the outer circumference, and is formed with a press-fitting pin hole passing through the central shaft; an engaging portion for engaging the collar; and a breakable portion, if there is a specific tensile force or more The action is broken; the holding portion is clamped by the holding member of the fastening tool; the collar is formed with a through hole having an inner diameter larger than that of the engaging portion; and a nut which can be screwed to The nut portion includes: a nut portion having a hexagonal shape; and a stopper portion formed with a diameter groove passing through the center shaft, and the fastener includes: a press-in pin insertable into the nut The diameter groove and the shaft of the shaft are pressed into the pin hole.

A threaded pin hole is formed in the threaded portion outside the shaft, the nut includes a stopper portion formed with a diameter groove, and further includes a fastener for pressing the pin, because the nut is held in a non-rotating manner by pressing the pin, The nut is not loose. Moreover, if the press pin is pulled and the nut is reversely rotated, the nut can be easily removed.

A fifth aspect of the present invention (claim 14) is a fastening structure (third embodiment) characterized in that a plurality of members to be mounted having fastening holes are fastened by fasteners, and includes: a shaft Breaking at the breakable portion and comprising: an externally threaded portion formed with an external thread on the outer circumference and forming a press-fit pin hole; and an engaging portion for engaging the collar; the collar being engaged with the above a peripheral portion of the engaging portion; the nut is screwed to the external thread portion and includes: a nut portion; and a stopper portion adjacent to the nut portion and formed with a diameter groove passing through the central shaft; and a press-in pin inserted The nut is inserted into the pin hole of the shaft and the diameter groove of the nut so that the nut is not rotated about the shaft, and the member to be mounted is fastened between the collar and the nut.

A sixth aspect of the present invention (claim 15) is a fastening method (third embodiment) characterized in that a plurality of members to be mounted having fastening holes are fastened by a fastener, and the following Step: a) preparing a fastener, comprising: a shaft having: an externally threaded portion formed with an external thread on an outer circumference, and formed with a press-fit pin hole passing through the central shaft; and a engaging portion for engaging the shaft a ring; a breakable portion that is broken if there is a specific tensile force or more; and a retaining portion for holding by a holding member of the fastening tool; the collar having an inner diameter formed by the engaging portion a through hole having a larger outer diameter; a nut screwable to the external thread portion, and comprising: a nut portion having a hexagonal shape; and a stopper portion formed with a diameter groove passing through the center shaft; and pressing a pin insertable into the diameter groove of the nut and the press-fitting pin hole of the shaft; b) inserting the nut from a front end side of the shaft, screwing the nut to the external thread portion, and inserting a press pin The above-mentioned pressure pin of the above-mentioned nut and the above-mentioned press pin of the shaft , Made shaft assembly, c) inserting the shaft assembly into the mounting hole of the member to be mounted with the rear end of the shaft as a front end, and abutting the nut against the member to be mounted, and the outer periphery of the engaging portion of the shaft Arranging the collar so that the surface of the collar abuts around the mounting hole of the mounted member; d) supporting the collar, pulling the retaining portion of the shaft from the rear end side, and twisting the collar The outer circumference is engaged with the engagement portion of the shaft, the shaft is broken at the breakable portion, and the member to be mounted is fastened between the collar and the nut.

According to the present invention, it is possible to provide a fastener, a fastening structure and a fastening method which are not released in use after fastening the member to be mounted.

Further, a fastener, a fastening structure, and a fastening method which can be easily removed after fastening can be provided.

1‧‧‧fasteners

1'‧‧‧fasteners

1"‧‧‧fasteners

10‧‧‧Axis

10"‧‧‧ axis

11‧‧‧ front end

11"‧‧‧ front end

11a‧‧‧ recess

12‧‧‧ Angle Department

13‧‧‧External thread

14‧‧‧Cylinder

15‧‧‧Clock Department

16‧‧‧breakable part

16'‧‧‧breakable part

17‧‧‧ Holding Department

18‧‧‧ Back end

19‧‧‧Indented pin hole

20‧‧‧ collar

20'‧‧‧ collar

21‧‧‧Cylinder

22‧‧‧Bevel

22'‧‧‧Twist the slope

24‧‧‧through holes

30‧‧‧ nuts

32‧‧‧ internal thread

40‧‧‧Cap

41‧‧‧round hole

42‧‧‧ corner hole

43‧‧‧Nuts snap hole

50‧‧‧Cap

51‧‧‧Flat Department

52‧‧‧Protruding

53‧‧‧Flexing Department

54‧‧‧Bend

55‧‧‧ front end

60‧‧‧ buckle

62‧‧‧ convex

71‧‧‧Installed components

72‧‧‧Installed components

73‧‧‧Installation holes

74‧‧‧Installation holes

80‧‧‧ nuts

81‧‧‧ nut part

82‧‧‧stop section

83‧‧‧diameter slot

85‧‧‧Pushing into the pin

Fig. 1 is an exploded perspective view showing a shaft, a nut, a cap, and a buckle of the fastener according to the first embodiment of the present invention.

Figure 2 is a front elevational view, partially in section, of the shaft assembly of the shaft mounting nut, cap and buckle of the fastener of Figure 1.

Figure 3 is a right side view of the shaft assembly of Figure 2.

Figure 4 is a left side view of the shaft assembly of Figure 2.

Figure 5 is a front elevational view of the shaft of the fastener of Figure 1.

Figure 6 is a right side view of the axis of Figure 5.

Figure 7 is a perspective view of the collar of the fastener of Figure 1.

Figure 8 is a front elevational view, partially in section, of the collar of Figure 7.

Figure 9 is a right side view of the collar of Figure 7.

Figure 10 is a front elevational view of the cap of the fastener of Figure 1.

Figure 11 is a left side view of the cap of Figure 10.

Figure 12 is a cross-sectional view taken along line A-A of the cap of Figure 10.

Fig. 13 is a perspective view showing a state in which the fastener of the first embodiment is placed on a member to be attached.

Figure 14 is a front elevational view of the fastener and the mounted member of Figure 13.

Fig. 15 is a perspective view showing the state in which the member to be mounted is fastened from the state of Fig. 13.

Figure 16 is a front elevational view of the fastener and the mounted member of Figure 15.

Figure 17 is a perspective view of the intermediate step of removing the fastener from the state of Figure 15.

Figure 18 is a perspective view showing the step of completely removing the fastener from the state of Figure 17.

Fig. 19 is an exploded perspective view showing the shaft, the nut, the cap, and the buckle of the fastener according to the second embodiment of the present invention.

Figure 20 is a front cross-sectional view showing a portion of a shaft assembly in which a nut, a cap, and a buckle are attached to the shaft of the fastener of Figure 19.

Figure 21 is a bottom plan view of the shaft assembly of Figure 20.

Figure 22 is a right side view of the shaft assembly of Figure 20.

Figure 23 is a left side view of the shaft assembly of Figure 20.

Figure 24 is a perspective view of the cap of the fastener of Figure 19.

Figure 25 is a front elevational view of the cap of Figure 24.

Figure 26 is a right side view of the cap of Figure 24.

Fig. 27 is a front view showing a state in which the member to be attached is fastened by the fastener of the second embodiment.

Fig. 28 is a perspective view showing a shaft assembly in which a nut and a press-in pin are attached to a shaft of a fastener according to a third embodiment of the present invention.

Figure 29 is a front elevational view of the shaft assembly of Figure 28.

(First embodiment)

Hereinafter, the fastener 1 according to the first embodiment of the present invention will be described with reference to the drawings. Bright. Fig. 1 is an exploded perspective view of the shaft 10, the nut 30, the lock cap (cap) 40, and the buckle 60 of the fastener 1 according to the first embodiment of the present invention. Attaching the nut 30, the cap 40, and the buckle 60 (optional) to the shaft 10 of the fastener 1 is referred to as a shaft assembly. Fig. 2 is a front elevational view, partly in section, of the shaft assembly of Fig. 1. Figure 3 is a right side view of the shaft assembly of Figure 2, and Figure 4 is a left side view. The collar 20 is not shown in Figs. 1 to 4 . In the present specification, the right side of FIG. 2 is referred to as a front end, and the left side is referred to as a rear end.

The fastener 1 includes a shaft 10, a collar 20, a nut 30, a cap 40, and a buckle 60. There is also no buckle 60. Hereinafter, the members of the fastener 1 will be described in order.

(axis)

Figure 5 is a front view of the shaft 10, and Figure 6 is a right side view. The shaft 10 includes a front end portion 11, a concave portion 11a, an angular portion 12, a male screw portion 13, a cylindrical portion 14, an engaging portion 15, a breakable portion 16, a retaining portion 17, and a rear end portion 18 along the central axis from the front end side. .

The material of the shaft 10 is steel or the like.

The front end portion 11 has a circular front surface, and the front end portion 11 has a chamfered square shape having the same shape as the angular portion 12. Adjacent to the front end of the shaft 10, a groove-like recess 11a is formed. A buckle 60 to be described later can be fitted into the recess 11a.

An angled portion 12 is formed adjacent to the recess 11a. The angled portion 12 has a quadrangular cross section and the corner portion is chamfered. The angled portion 12 is adapted to the shape of the corner hole 42 of the cap 40 to be described later.

The cross-section of the angular portion 12 may not be a quadrangular shape, but may be other triangular shapes such as a triangle, a hexagon, or an octagon. In this case, the corner hole 42 of the cap 40 also has a shape suitable for the shape of the angled portion 12.

Adjacent to the angled portion 12, there is a male threaded portion 13. An external thread is formed in the male screw portion 13. The external thread portion 13 is externally threaded, and the internal thread 32 of the nut 30 to be described later is engaged.

Adjacent to the externally threaded portion 13, there is a cylindrical portion 14. The cylindrical portion 14 has a circular cross section. The outer diameter of the cylindrical portion 14 is substantially the same as the outer diameter of the outer thread of the male screw portion 13. The outer diameter of the cylindrical portion 14 is smaller than the inner diameters of the mounting holes 73, 74 of the mounted members 71, 72, and is fastened. The cylindrical portion 14 enters the mounting holes 73, 74 of the mounted members 71, 72.

Adjacent to the cylindrical portion 14, there is an engaging portion 15. In the engaging portion 15, a circumferential groove having a concentric shape is formed at a predetermined interval on the outer circumference. The outer diameter of the top of the engaging portion 15 is substantially equal to the outer diameter of the cylindrical portion 14. The collar 20 to be described later is disposed on the outer peripheral portion of the engaging portion 15, and the collar 20 is screwed from the outer circumference by the twisting member of the fastening tool, whereby the inner surface of the collar 20 can be engaged with the engaging portion 15.

Further, the engaging portion 15 may be formed as an external thread instead of the circumferential groove. In the case of forming an external thread, the collar 20 can also be screwed from the outer circumference to be engaged with the external thread. When the external thread is formed, if the collar 20 is reversely rotated, the collar 20 can be removed.

Adjacent to the engaging portion 15, the rupturable portion 16 having a smaller outer diameter than the engaging portion 15 is provided. The rupturable portion 16 is a portion that is broken when the shaft portion of the shaft 10 is pulled by the holding member of the fastening tool, if it exceeds a certain pulling force.

Adjacent to the breakable portion 16, there is a holding portion 17 in which a fine peripheral groove is formed. The outer diameter of the top groove of the retaining portion 17 is larger than the outer diameter of the breakable portion 16, and is substantially equal to the outer diameter of the cylindrical portion 14. The holding portion 17 is a portion that is held when the shaft portion of the shaft 10 is held by the holding member of the fastening tool and is pulled, and a circumferential groove is formed so as not to slide.

Alternatively, the holding portion 17 may be formed with irregularities of other shapes instead of the circumferential grooves, and the holding portion 17 may be pulled without sliding.

Adjacent to the holding portion 17, there is a rear end portion 18. The rear end portion 18 is taper and tapered at the rear end for easy insertion into the holding member of the fastening tool.

(axle)

Figure 7 is a perspective view of the collar 20, Figure 8 is a front view of a portion of the section, and Figure 9 is a right side view. The collar 20 includes a cylindrical portion 21 and a slope portion 22 that is adjacent to the cylindrical portion 21, and the collar 20 is formed with a through hole 24 along the central axis.

The collar 20 is made of a softer material than the shaft 10, such as aluminum, aluminum alloy, or the like. Alternatively, it may be made of steel or the like similarly to the shaft 10.

The cylindrical portion 21 is cylindrical. The outer diameter of the cylindrical portion 21 is larger than the inner diameters of the attachment holes 73, 74 of the mounted members 71, 72, and the cylindrical portion 21 cannot pass through the attachment holes 73, 74.

The inclined surface portion 22 is adjacent to the cylindrical portion 21, and the outer diameter is gradually tapered from the cylindrical portion 21. The bevel portion 22 is shaped like a conical trapezoid. The cylindrical portion 21 can be screwed to the inclined portion 22 against the caulking member of the fastening tool.

The inner diameter of the through hole 24 is equal to or larger than the outer diameter of the top of the engaging portion 15 of the shaft 10, and the collar 20 can be disposed on the outer circumference of the engaging portion 15 of the shaft 10. The collar 20 is disposed on the outer peripheral portion of the engaging portion 15 of the shaft 10, and the collar 20 is screwed from the outer circumference by the caulking member of the fastening tool, so that the inner surface of the collar 20 can be engaged with the engaging portion 15.

(nut)

Refer to Figure 1. The nut 30 is a nut having a generally hexagonal shape and is formed with a threaded hole in which an internal thread 32 is formed. The nut 30 is engaged with the external thread of the threaded portion 13 outside the shaft 10. The length of the nut 30 in the central axis direction is substantially equal to the length of the threaded portion 13 outside the shaft 10.

The nut 30 may not have a hexagonal shape but a triangular shape, a quadrangular shape, an octagonal shape or the like.

(cap)

Figure 10 is a front view of the cap 40, Figure 11 is a left side view, and Figure 12 is a cross-sectional view taken along line A-A of Figure 10. The cap 40 is formed of a resin. After tightening the mounted members 71, 72, the cap 40 surrounds the outer peripheral portion of the nut 30 and the outer peripheral portion of the angular portion 12 of the shaft 10, so that the nut 30 is held so as not to rotate about the shaft 10. The cap 40 can also be formed from metal.

The front end portion of the cap 40 is circular, and a shallow circular hole 41 having a central axis as a center is formed. The buckle 60, which will be described later, enters the circular hole 41.

The outer circumference of the cap 40 has a circular cross section, and the radius of the cross section gradually increases as it advances from the front end to the rear end. Adjacent to the circular hole 41, an angular hole 42 having a quadrangular cross section is formed. The corner hole 42 is adapted to the shape of the angular portion 12 of the shaft 10, and the axial length of the corner hole 42 is substantially equal to the axial length of the angular portion 12. The angled portion 12 of the shaft 10 is a non-tetragonal other angular shape. In the case of the case, the corner hole 42 of the cap 40 is shaped to be suitable for the shape of the angular portion 12 of the shaft 10.

Adjacent to the corner hole 42 to the rear end, a nut engaging hole 43 having a hexagonal cross section is formed. The cross section of the nut engaging hole 43 is larger than the cross section of the corner hole 42. The nut engagement hole 43 is adapted to the hexagonal shape of the nut 30, and the axial length of the nut engagement hole 43 is substantially equal to the axial length of the nut 30. In the case where the nut 30 is a non-hexagonal other angular shape, the nut engaging hole 43 of the cap 40 is shaped to be suitable for the shape of the nut 30.

The rear end of the cap 40 is rounded on the outside and the inside is a hexagonal plane.

As shown in FIG. 2, in the state in which the nut 30, the cap 40 and the buckle 60 are attached to the shaft 10, the buckle 60 enters the circular hole 41 of the cap 40, and the angular portion 12 of the shaft 10 enters the cap 40. Inside the corner hole 42, the nut 30 enters the inside of the nut engaging hole 43 of the cap 40.

( buckle)

Refer to Figure 1. The buckle 60 is a member for holding the cap 40 off from the shaft 10. There is also no buckle 60. The buckle 60 is opened in a C-shape. The outer diameter of the buckle 60 is substantially equal to the inner diameter of the circular hole 41 of the cap 40, and the thickness of the buckle 60 is equal to the depth of the circular hole 41 of the cap 40. The buckle 60 is adapted to the circular aperture 41 of the cap 40. The three portions on the inner side of the buckle 60 have convex portions 62. The convex portion 62 is located at an intermediate portion between both end portions and both end portions of the C-shape. The convex portion 62 is engaged with the concave portion 11a between the front end portion 11 of the shaft 10 and the angular portion 12. The retaining ring 60 enters the circular hole 41 of the cap 40 and restrains the face of the cap 40 around the corner hole 42 from being held in such a manner that the cap 40 does not fall off.

(Setting of fasteners)

Next, the operation of providing the fastener 1 to the mounted members 71 and 72 will be described.

2 is a front cross-sectional view showing a portion of the assembly of the nut 30, the cap 40, and the retaining ring 60 of the shaft 10 of the fastener 1 of FIG.

Fig. 13 is a perspective view showing a state in which the fastener 1 is placed in the mounting holes 73, 74 of the mounted members 71, 72. Figure 14 is a front view.

The nut 30 is inserted from the front end side of the shaft 10 (the right side of FIG. 2), and the nut 30 is screwed to the outer screw. The pattern portion 13. Next, the cap 40 is inserted, and the nut engaging hole 43 of the cap 40 covers the outer peripheral portion of the nut 30, and the corner hole 42 of the cap 40 covers the outer peripheral portion of the angular portion 12 of the shaft 10. At this time, the angle of the screw nut 30 is adjusted so that the nut 30 enters the cap 40 together with the angled portion 12 of the shaft 10. The plane between the nut engaging hole 43 of the cap 40 and the corner hole 42 abuts against the front surface of the nut 30.

Next, the retaining ring 60 enters the circular hole 41 of the cap 40, and the convex portion 62 of the retaining ring 60 is engaged with the recess 11a between the front end portion 11 of the shaft 10 and the angular portion 12. Thereby, the nut 30 is fixed in such a manner that the shaft 10 cannot be rotated.

Thereby, the shaft assembly shown in FIG. 2 is obtained.

Next, the mounted members 71, 72 are superposed in such a manner that the mounting holes 73, 74 are aligned. From the right side of Fig. 14, the shaft assembly of the shaft 10, the nut 30, the cap 40, and the retaining ring 60 is assembled, and the rear end portion 18 of the shaft 10 is the front end, and is inserted into the mounting holes 73, 74 of the mounted members 71, 72. . When the rear surface of the nut 30 abuts against the mounting hole 74 of the member to be mounted 72, the movement of the shaft assembly is stopped.

Next, the collar 20 is inserted from the rear end side of the shaft 10 (the left side of FIG. 14). Since the inner diameter of the through hole 24 of the collar 20 is larger than the outer diameter of the shaft 10, the collar 20 moves from the outer periphery of the retaining portion 17 and the rupturable portion 16 to the right direction of FIG. When the surface of the collar 20 abuts against the mounting hole 73 of the member to be mounted 71, the movement of the collar 20 is stopped. At this time, the collar 20 is located on the outer circumference of the engaging portion 15 of the shaft 10.

(fastening of the mounted components)

Next, the operation of fastening the mounted members 71 and 72 by the fastener 1 will be described. In the first embodiment, the case where the two members to be attached 71 and 72 are fastened will be described, but the number of the members to be mounted 71 and 72 is not limited to two. The fastener 1 can be mounted on one of the mounted components. Further, it is also possible to fasten three or more members to be attached.

Fig. 15 is a perspective view showing a state in which the mounted members 71, 72 are fastened by the fastener 1. Figure 16 is a front view.

The front end portion of the screwing member (not shown) of the fastening tool has a sloped surface. Screwing member The front end abuts against the inclined surface portion 22 of the collar 20, and the holding portion 17 of the shaft 10 is held by a holding member (not shown) of the fastening device, and is pulled toward the rear end side of the shaft 10 (the left side of FIG. 14).

The collar 20 is twisted by the twisting member, and the outer diameter becomes small. The collar 20 having the outer diameter reduced and engaged is indicated by reference numeral 20'. The inclined surface portion 22 is a non-beveled surface. The twisting member of the fastening tool is screwed to form a twisting inclined surface portion 22' on the front end side of the collar 20'. The inner diameter of the through hole 24 of the collar 20' is reduced, and the inner surface of the collar 20' is engaged with the circumferential groove of the engaging portion 15. By this action, the mounted members 71, 72 are firmly held between the collar 20' and the nut 30. When the plastic deformation of the collar 20' is increased, the work hardens and it becomes difficult to plastically deform.

When the tensile stress applied to the shaft 10 exceeds the fracture limit of the breakable portion 16, the shaft 10 is broken at the breakable portion 16 to become the fracture portion 16'. The portion from the front end portion 11 to the broken portion 16' is left in the fastened portion.

The screwing member and the holding member of the fastening tool are retracted in the left direction of FIG. 16, and the fastening operation is completed.

(Removal of the mounted components)

The state in which the fasteners 1 are tightened in the state of Figs. 15 and 16 of the members to be attached 71 and 72, the fastener 1 is removed, and the fastening of the members to be attached 71 and 72 is released.

Figure 17 is a perspective view showing an intermediate step of removing the fastener 1 from the mounted members 71, 72. Figure 18 is a perspective view of the complete removal.

First, the buckle 60 is removed using the front end of the driver or the like. If the buckle 60 is removed, the cap 40 can be pulled out.

If the cap 40 is pulled out, the nut 30 can be rotated about the shaft 10. The nut 30 is reversely rotated to release the engagement with the male screw portion 13.

Fig. 17 shows the state in which the buckle 60, the cap 40, and the nut 30 are removed.

When the nut 30 is removed from the shaft 10, the collar 20' and the shaft 10 can be pulled out from the mounting holes 73, 74 of the mounted members 71, 72 in the rear end direction (upper left in Fig. 18).

Figure 18 shows the extraction of the collar 20' and the shaft 10 to release the fastening of the mounted members 71 and 72. State. Since the collar 20' is engaged with the engaging portion 15 of the shaft 10, it cannot be removed.

When the members to be mounted 71 and 72 are fastened again, the shaft 10 to which the collar 20 is fixed is inserted into the mounting holes 73 and 74 of the members to be mounted 71 and 72 from the state of Fig. 18, and the nut 30 is screwed from the front end side. Upper cap 40. A retaining ring 60 can be installed as needed.

According to the first embodiment of the present invention, the members to be attached 71 and 72 are firmly secured by the collar 20 engaged with the engaging portion 15 of the shaft 10 and the nut 30 screwed to the threaded portion 13 of the shaft 10 The mounted members 71, 72 are fixed to the ground.

The angled portion 12 of the shaft 10 is retained by the corner hole 42 of the cap 40, and the nut 30 is retained by the nut engaging hole 43 of the cap 40. The nut 30 is held in such a manner that it cannot rotate about the shaft 10. Therefore, the nut 30 is not loosened when it is not intentionally released, and the fastening of the mounted members 71 and 72 is released.

After tightening the mounted members 71, 72, the collar 20' is engaged with the shaft 10. However, if the buckle 60, the cap 40, and the nut 30 are sequentially removed, the shaft 10 to which the collar 20' is engaged can be pulled out and can be easily removed.

(Second embodiment)

The fastener 1' according to the second embodiment of the present invention will be described. Fig. 19 is an exploded perspective view showing the shaft 10, the nut 30, the cap 50, and the buckle 60 of the fastener 1' according to the second embodiment of the present invention. Figure 20 is a front elevational view, partially in section, of the shaft assembly of the nut 30, the cap 50 and the retaining ring 60 of the shaft 10 of the fastener 1' of Figure 19. Figure 21 is a bottom plan view of the shaft assembly of Figure 20, Figure 22 is a right side view, and Figure 23 is a left side view.

In the second embodiment, only differences from the first embodiment will be described.

As shown in Fig. 19, in the second embodiment, a metal cap 50 is used instead of the resin cap 40 of the first embodiment. Similarly to the cap 40 of the first embodiment, the cap 50 of the second embodiment holds the nut 30 so that the shaft 10 cannot rotate. The shaft 10, the collar 20, the nut 30, and the buckle 60, which are members of the second embodiment, are the same as the shaft 10, the collar 20, the nut 30, and the buckle 60 which are members of the first embodiment. As in the first embodiment, the buckle 60 may be omitted.

Figure 24 is a perspective view of the cap 50 of the fastener 1' of Figure 19. Figure 25 is a front view and Figure 26 is a right side view.

The cap 50 has a rectangular flat portion 51 that forms an opening at the center portion. In the state of the shaft assembly, the flat portion 51 abuts against the front surface of the nut 30.

The cap 50 has a pair of projections 52 that are curvedly extended from opposite ends of the opening. The protruding portions 52 extend in such a manner that the front end directions are close to each other. The distance between the opposite ends of the protruding portion 52 is substantially equal to the distance between the two faces of the angular portion 12 of the shaft 10, so that the angular portion 12 of the shaft 10 is received between the pair of protruding portions 52.

The cap 50 has two bent portions 54 that are bent and extended from the two end portions of the flat portion 51. The bent portion 54 extends in the rear end direction. The front end of the curved portion 54 is bent at the bent portion 53, and the front end portion 55 is extended away from each other. The distance between the opposing flexures 53 is substantially equal to the distance between the two sides of the nut 30 such that the nut 30 fits between the pair of flexures 53.

In the shaft assembly shown in FIG. 20, the protruding portion 52 abuts against the two side faces of the front end portion 11 of the shaft 10. The bent portion 53 abuts against both sides of the nut 30.

The buckle 60 abuts against the front end of the projection 52 of the cap 50. The convex portion 62 of the buckle 60 is engaged with the concave portion 11a between the front end portion 11 of the shaft 10 and the angular portion 12. The protruding portion 52 of the cap 50 abuts against the angled portion 12 of the shaft 10, and the bent portion 53 of the cap 50 abuts against the side of the nut 30. Therefore, the nut 30 is held in such a manner that it cannot rotate about the shaft 10.

Also in the second embodiment, by using the retaining ring 60, the nut 30 is held so as not to be loosened from the shaft 10, and the fastening of the attached members 71, 72 is not released when it is not intentional.

Moreover, after the fastening members 71 and 72 are fastened, the buckle 60, the cap 50, and the nut 30 are sequentially removed, the shaft 10 to which the collar 20 is fixed can be pulled out, and the mounted member 71 can be easily removed. 72.

(Third embodiment)

The fastener 1 of the third embodiment of the present invention will be described. Fig. 28 is a shaft assembly of the shaft 10" mounting nut 80 and the press-in pin 85 of the fastener 1" according to the third embodiment of the present invention. Stereo view. Figure 29 is a front view.

The fastener 1 of the third embodiment replaces the nut 30 of the first and second embodiments, and the nut 80 and the press-in pin 85 are used. The cap 40 and the buckle 60 are not used. The shaft assembly of the fastener 1" has a shaft. 10", nut 80 and press-in pin 85.

The press-in pin 85 passes through the diameter groove 83 of the nut 80 and the press-fit pin hole 19 formed in the shaft 10". By pressing the pin 85, the nut 80 is held in such a manner that it cannot rotate about the shaft 10.

The shaft 1" of the fastener 1" has no angled portion 12. The shaft 10" has a front end portion 11", a male screw portion, a cylindrical portion 14, an engaging portion 15, a breakable portion 16, a holding portion 17, and a rear end portion 18.

The extension portion of the front end portion 11" is an outer diameter substantially the same as the outer thread portion, and has a tapered taper at the front end. At the center portion of the front end portion 11", from the front end side to the stop portion of the nut 80 At a depth of 82, the cross section is formed with a polygonal hole, and when removed, the tool (wrench, etc.) can be engaged.

A press-fitting pin hole 19 through which the press-fitting pin 85 is inserted and penetrates the radial direction through the center shaft is formed in the male screw portion.

In the third embodiment, a nut 80 is used instead of the nut 30 of the first embodiment. As shown in FIG. 28, the nut 80 has a nut portion 81 having a hexagonal cross section and a stopper portion 82 adjacent to the nut portion 81. An internal thread 32 is formed in the nut portion 81 and the stopper portion 82.

At the stopper portion 82, three diameter grooves 83 extending through the central axis and extending in the diagonal direction are formed.

The press-in pin 85 is a thin cylindrical pin which can be inserted into the diameter groove 83 of the nut 80 and can be inserted into the press-fitting pin hole 19 of the shaft 10". If the press-in pin 85 is inserted into the diameter groove 83 of the nut 80, The press-fit pin hole 19 of the shaft 10" is held in such a manner that it is not easy to pull out.

Since the press-in pin 85 is inserted into the diameter groove 83 of the nut 80 and the press-fit pin hole 19 of the shaft 10", the nut 80 is held so as not to rotate about the shaft 10.

In the third embodiment, the nut 80 is held so as not to be loose from the shaft 10", and the fastening of the members to be attached 71, 72 is not released when it is not intentional.

Further, after the members to be mounted 71 and 72 are fastened, the press-fitting pin 85 is pulled out, and the nut 80 can be removed from the shaft 10". Thus, the mounting holes 73, 74 of the mounted members 71, 72 can be pulled out and fixed. There is a shaft 10" of the collar 20. Moreover, the mounted members 71 and 72 can be simply removed.

In the third embodiment, the number of parts is smaller than that of the first and second embodiments, and the fastener 1" is not loosened when it is not intentional, and can be easily removed when it is to be removed.

10‧‧‧Axis

11‧‧‧ front end

12‧‧‧ Angle Department

13‧‧‧External thread

14‧‧‧Cylinder

15‧‧‧Clock Department

16‧‧‧breakable part

17‧‧‧ Holding Department

18‧‧‧ Back end

30‧‧‧ nuts

32‧‧‧ internal thread

40‧‧‧Cap

41‧‧‧round hole

42‧‧‧ corner hole

60‧‧‧ buckle

62‧‧‧ convex

Claims (15)

A fastener, characterized in that it is used to fasten a plurality of mounted members having mounting holes, and includes: a shaft comprising: an angular portion having an angular shape; and an externally threaded portion formed with an external thread; a latching portion for engaging a collar; a breakable portion that is broken if a specific tensile force is applied; and a retaining portion for holding by a holding member of the fastening tool; the collar, A through hole having an inner diameter larger than that of the engaging portion is formed; a nut that can be screwed to the external thread portion; and a cap for holding the nut in a manner that does not rotate about the shaft. The fastener of claim 1, wherein: the cap has a corner hole that engages with the angular portion of the shaft; and a nut engaging hole that engages with the nut. The fastener of claim 2, wherein the angled portion of the shaft has a quadrangular shape, and the cross-section of the corner hole of the cap is also quadrangular. The fastener of claim 1, wherein: the cap comprises: a protruding portion that is engaged with the angular portion of the shaft, protruding toward one side of the planar portion; and a flexing portion that is engaged with the nut Converging on the other side of the planar portion. The fastener of any one of claims 1 to 4, wherein: the shaft is formed with a recess adjacent to the angular portion, and the fastener further comprises a cap for retaining the cap without being detached from the shaft. a buckle that is fitted to the recess. The fastener according to any one of claims 1 to 4, wherein the engaging portion of the shaft is formed with a circumferential groove on the outer circumference. The fastener according to any one of claims 1 to 4, wherein the collar comprises a cylindrical cylindrical portion and a slope portion which is adjacent to the cylindrical portion and has an outer diameter which is tapered. A fastening structure characterized in that a plurality of mounted members having mounting holes are fastened by fasteners, and includes: a shaft which is broken at the breakable portion and has an angular portion having an angular shape; a threaded portion formed with an external thread; and an engaging portion for engaging the collar; the collar being engaged with the outer periphery of the engaging portion; a nut screwed to the external thread portion; and a cap a cover that holds the nut so as not to rotate about the shaft, and fastens the mounted member between the collar and the nut. The fastening structure of claim 8, wherein: the cap comprises: a corner hole that engages with the angular portion of the shaft; and a nut engaging hole that engages with a peripheral portion of the nut. The fastening structure of claim 8, wherein: the cap comprises: a protruding portion that is engaged with the angular portion of the shaft, protrudes on one side of the flat portion; and a bent portion that is engaged with the nut The outer peripheral portion is formed on the other side of the flat portion. The fastening structure according to any one of claims 8 to 10, wherein: the shaft is formed with a recess adjacent to the angular portion; and the retaining ring engages the retaining ring, the retaining ring such that the cap does not fall off the shaft The way to keep. A fastening method is characterized in that a plurality of mounted members having mounting holes are fastened by fasteners, and the following steps are included: a) preparing a fastener comprising: a shaft having: an angular portion having an angular shape; an externally threaded portion formed with an external thread; an engaging portion for engaging the collar; and a breakable portion if And a holding portion for clamping by a holding member of the fastening tool; the collar is formed with a through hole having an inner diameter larger than that of the engaging portion; a nut that can be screwed to the external thread; and a cap for holding the nut in a manner that does not rotate the shaft, b) inserting the nut from a front end side of the shaft, and screwing the nut to the above The male screw portion is formed by the cap on the outer circumference of the nut and the angular portion of the shaft, and c) the shaft assembly is inserted into the mounted member at the rear end of the shaft a mounting hole that abuts the nut to the mounting member, and arranges the collar so that the surface of the collar abuts against the mounting hole of the mounting member on the outer circumference of the engaging portion of the shaft , d) support the above Pulling the retaining portion of the shaft from the rear end side, twisting the outer circumference of the collar and engaging the engaging portion of the shaft, causing the shaft to be broken at the breakable portion, and the collar and the collar The above-mentioned member to be mounted is fastened between the nuts. A fastener characterized in that it is used to fasten a plurality of mounted members having mounting holes, and includes: a shaft having: an externally threaded portion formed with an external thread at an outer circumference and formed through a central shaft Pressing into the pin hole; engaging portion for engaging the collar; a breakable portion that is broken if there is a specific tensile force or more; and a retaining portion for holding the retaining member of the fastening tool hold; The collar is formed with a through hole having an inner diameter larger than that of the engaging portion; a nut that can be screwed to the external thread and includes: a nut portion having a hexagonal shape; and a stopper portion a diameter groove passing through the center shaft; and a press-in pin insertable into the diameter groove of the nut and the press-fitting pin hole of the shaft. A fastening structure characterized in that a plurality of mounted members having a mounting hole are fastened by a fastener, and includes: a shaft that is broken at the breakable portion and has an external thread portion formed on the outer circumference An external thread is formed with a press-fitting pin hole passing through the central shaft; and an engaging portion for engaging the collar; the collar is engaged with the outer periphery of the engaging portion, and the nut is screwed to The external thread portion further includes: a nut portion; and a stopper portion adjacent to the nut portion and having a diameter groove passing through the center shaft; and a press-in pin inserted into the press-fitting pin hole of the shaft and the The diameter groove of the nut is such that the nut is held so as not to rotate with respect to the shaft, and the member to be mounted is fastened between the collar and the nut. A fastening method characterized by fastening a plurality of mounted members having mounting holes by fasteners, and comprising the steps of: a) preparing a fastener comprising: a shaft having: an external thread portion The outer circumference is formed with an external thread, and is formed with a press-fitting pin hole passing through the central shaft; a engaging portion for engaging the collar; and a breakable portion which is broken if there is a specific tensile force or more; And a holding portion for holding by the holding member of the fastening tool; the collar is formed with a through hole having an inner diameter larger than an outer diameter of the engaging portion; and a nut screwable to the external thread And contains: the nut part, its shape a hexagonal shape; and a stopper portion formed with a diameter groove passing through the central shaft; and a press-in pin insertable into the diameter groove of the nut and the press-fitting pin hole of the shaft; b) from the shaft The nut is inserted into the distal end side, the nut is screwed to the male screw portion, and the press pin is inserted into the diameter groove of the nut and the press pin hole of the shaft to form a shaft assembly, and c) after the shaft The end portion is inserted into the mounting hole of the member to be mounted, and the nut is brought into contact with the member to be attached, and the outer surface of the engaging portion of the shaft is abutted against the surface of the collar. Arranging the collar so as to surround the mounting hole of the mounting member, d) supporting the collar, pulling the retaining portion of the shaft from the rear end side, and twisting the outer circumference of the collar to engage the above The shaft engaging portion breaks the shaft at the breakable portion, and fastens the attached member between the collar and the nut.