TW201610308A - A blind rivet and fastening method thereof - Google Patents

Abstract

Provided is a blind rivet which can compress a member to be mounted using a sufficient amount of compressing force, the blind rivet being provided with a rivet main body (10) and a mandrel (20). The rivet main body (10) has a hollow sleeve (11) and a flange (12) formed at one end of the sleeve. The sleeve has a thin-walled portion (14) adjacent to the flange, and a thick-walled portion (15) provided at a side end side of the sleeve and having an inner diameter less than that of the thin-walled portion. The mandrel (20) has a thin and long shaft portion (21) having a diameter less than the inner diameter of the thin-walled portion, and a mandrel head portion (23) having a diameter greater than the inner diameter of the thick-walled portion. The mandrel head portion has a head portion slot (24) passing through the central axis of the mandrel. When the mandrel shaft portion is pulled out through a through-hole of the rivet main body, the diameter of the thick-walled portion is increased by means of the mandrel head portion such that the thick-walled portion becomes an expanded diameter portion (15a), the mandrel head portion is reduced in diameter by being bent in the head portion slot, and the mandrel head portion is pulled out through the through-hole of the rivet main body without being broken from the shaft portion.

Description

Blind rivet and fastening method thereof

The present invention relates to a blind rivet, and more particularly to a blind rivet for removing a mandrel head of a mandrel through a rivet body and a fastening method therefor.

It is known to have a blind rivet comprising: a hollow metal rivet body comprising a sleeve and a flange formed at one end of the sleeve; a metal mandrel passing through the through hole of the rivet body and the shaft portion from the flange Extend out. The advantage of a blind rivet is that a plurality of panels can be joined by only one end side of the work.

The rivet body of the blind rivet is formed with a flange at one end and includes a cylindrical sleeve extending from the flange. The mandrel of the blind rivet has a mandrel head having a larger diameter than the inner diameter of the sleeve at the end, and includes a shaft portion penetrating the rivet body. The mandrel is inserted into the through hole of the rivet body, and the mandrel head is disposed adjacent to one end of the sleeve of the rivet body opposite to the flange, and the shaft portion is disposed to extend from the flange to be assembled as a blind rivet.

The head of the assembled blind rivet is the front end, and the hole of the mounted member such as the panel is inserted, and the flange abuts around the hole of the member to be mounted. In this state, the flange is held by the fastening tool, and the shaft portion of the holding mandrel is pulled out from the flange side, and the end portion of the sleeve of the rivet body is expanded by the mandrel head. The diameter is deformed, and the mandrel is broken at the thin fracture portion of the shaft portion, and the member to be mounted is fastened between the flange and the enlarged diameter portion of the expanded diameter sleeve.

The blind rivet which is thus fastened and broken by the mandrel generally does not need to deform the mandrel head, ie The end portion of the sleeve of the rivet body can be tightened to be fastened, but the state in which the diameter of the end of the sleeve is expanded is unstable. Further, there is a case where the head of the mandrel is excessively pulled into the end portion of the shaft portion of the rivet body.

Further, when the mandrel is broken at the fracture portion, the portion from the fracture portion to the head portion remains on the rivet body side, so that the portion of the remaining mandrel is detached from the rivet body.

In order to solve such a disadvantage, there is a blind rivet in which the shaft head is not broken from the shaft portion of the spindle, and the rivet body is completely pulled out. This type of blind rivet is called a pull-through type blind rivet.

If the pull-type blind rivet grips the shaft of the mandrel with a fastening tool and pulls it out from the flange side of the rivet, the end of the rivet body is expanded by the mandrel head. Deformation, and a member to be mounted such as a panel is fastened between the flange and the end portion of the enlarged diameter casing. The mandrel head is tightened by the sleeve, so it is not broken from the shaft portion and is removed by the rivet body.

However, when tightening a conventional pull-type blind rivet, if the mandrel head expands the sleeve end of the rivet body, a portion of the material of the sleeve end is drawn into the sleeve. The position at which the material is pulled in is the inside of the mounting hole of the mounted member. If the mandrel head is pulled into the sleeve, the material pulled into the sleeve moves due to the mandrel head. Therefore, the sleeve extends in the axial direction due to the mandrel head.

In particular, when the material of the rivet body is a soft material such as soft aluminum, the extension of the sleeve in the axial direction is large. Moreover, in the case of a small pull-type blind rivet mounted on a small mounting hole having a diameter of about 1 mm, the influence of the extension of the sleeve is large.

When the sleeve is stretched in the axial direction, the force of crimping the member to be mounted in the thickness direction is significantly lost, and there is a possibility that the mounting portion is shaken.

Patent Document 1 discloses a blind rivet in which a mandrel head (head) is not broken from a mandrel stem (shaft portion) but is completely pulled out by a rivet (rivet body). Since the blind rivet of Patent Document 1 does not break, it is not necessary to confirm the position of the broken head after mounting, and there is no occurrence of breakage of the broken head. Therefore, the assembly is inexpensive and the quality is improved. also, Compared with the broken head mandrel, the required mounting load is small, so productivity is improved.

However, when the blind rivet of Patent Document 1 is fastened as described above, if the sleeve of the rivet body is extended in the axial direction by the mandrel head, there is a problem that the force of the member to be attached is lost.

Moreover, at the time of mounting, a large load is required in order to deform the mandrel head.

Therefore, a pull-type blind rivet which can press the member to be mounted with sufficient crimping force is sought.

Further, a pull-type blind rivet that can be mounted with a small mounting load is sought.

Further, a small pull-type blind rivet that can be mounted to a small mounting hole is sought.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-535987

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a pull-type blind rivet which can crimp a member to be mounted with sufficient crimping force.

Another object of the present invention is to provide a pull-type blind rivet that can be mounted with a small mounting load.

Another object of the present invention is to provide a small pull-out type blind rivet that can be mounted to a small mounting hole.

In order to achieve the object, in the present invention, a head groove is formed in the head of the mandrel, and the head of the mandrel is bent and reduced in diameter from the head groove when being pulled into the sleeve, and the head of the mandrel is easy. Through the sleeve.

Further, a thick portion is provided at the end portion of the sleeve, and the thick portion of the mandrel is expanded to form an enlarged diameter portion, and the inner diameter of the mandrel head passes through the thin portion after passing through the thick portion. Larger The resistance is getting smaller.

A first aspect of the present invention is a blind rivet characterized by comprising: a rivet body comprising a hollow sleeve, and a flange formed at one end of the sleeve, and formed at a side end from the sleeve side a through hole penetrating to the flange side end portion; and a mandrel comprising: an elongated shaft portion; and a mandrel head portion formed at one end of the shaft portion and having an outer diameter larger than an inner diameter of the through hole of the sleeve; And the rivet body is fastened to the mounted member, and when the shaft portion of the mandrel is pulled out, the end portion of the sleeve is pressed by the mandrel head to expand the diameter; the mandrel head can be The first through hole is not pulled out from the through hole of the rivet body; and a head groove for reducing the diameter of the mandrel head is formed on a side opposite to the shaft portion of the mandrel head. .

If the mandrel head has a head groove passing through the central axis of the mandrel, the mandrel head is bent from the head groove toward the central axis side, and is easily formed into a reduced diameter portion having a smaller outer diameter, thereby facilitating passage of the rivet a through hole on the inner side of the thin portion of the body. Therefore, it is not necessary to stretch the thin portion, that is, the member to be mounted can be fastened with sufficient crimping force.

Preferably, the head groove extends linearly in a radial direction from a central axis of the mandrel.

The above-mentioned head grooves of the four strips are preferably arranged at equal intervals.

Preferably, the sleeve of the rivet body includes a thin portion adjacent to the flange and a thick portion provided at an end portion opposite to the flange and having an inner diameter smaller than the thin portion.

When the sleeve includes a thin portion adjacent to the flange and a thick portion having an inner diameter smaller than the thin portion, the mandrel head expands the thick portion to form an expanded diameter. Then, the through hole of the inner side of the thin portion of the rivet body can be easily passed.

The outer diameter of the shaft portion of the mandrel is preferably the thick portion of the rivet body The inner diameter is equal or smaller and smaller than the inner diameter of the thin portion.

If the outer diameter of the shaft portion of the mandrel is equal to or slightly smaller than the inner diameter of the thick portion of the rivet body, the shaft portion of the mandrel is completely fitted to the inner side of the thick portion.

If the outer diameter of the shaft portion of the mandrel is smaller than the inner diameter of the thin portion, the mandrel head can pass through the inner side of the thin portion with less resistance after the thick portion is expanded.

When the shaft portion of the mandrel is pulled out, the thick portion of the rivet body is expanded by the mandrel head to form an enlarged diameter portion, and the mandrel head is tightened by the thick portion. The head groove is bent to form a reduced diameter portion, and the reduced diameter portion of the mandrel is preferably pulled out through the through hole.

A second aspect of the present invention is a blind rivet characterized by comprising: a rivet body comprising a hollow sleeve, and a flange formed at one end of the sleeve, and formed at a side end from the sleeve side a through hole penetrating to the flange side end portion; and a mandrel comprising: an elongated shaft portion; and a mandrel head portion formed at one end of the shaft portion and having an outer diameter larger than an inner diameter of the through hole of the sleeve; And the rivet body is fastened to the mounted member, and when the shaft portion of the mandrel is pulled out, the end portion of the sleeve is pressed by the mandrel head to expand the diameter; the mandrel head is not self-contained The shaft portion is broken and can be pulled out through the through hole of the rivet body; and the sleeve of the rivet body includes a thin portion adjacent to the flange and an end provided on a side opposite to the flange The inner diameter is smaller than the thick portion of the thin portion.

A third aspect of the present invention is a rivet body characterized by being a blind rivet together with a mandrel, and comprising: a hollow sleeve, and a flange formed at one end of the sleeve; and the sleeve The method includes a thin portion adjacent to the flange and a thick portion provided on an end portion opposite to the flange and having an inner diameter smaller than the thin portion.

If the sleeve includes a thin wall portion adjacent to the flange and a thick portion having an inner diameter smaller than the thin portion at the side of the sleeve side end, the thick portion can be expanded by the mandrel head And the diameter-enlarged portion is easily formed. Since the inner diameter of the thin portion is larger than the thick portion, the mandrel head can pass through the inner side of the thin portion with less resistance after the enlarged diameter portion is formed.

A fourth aspect of the present invention is a mandrel characterized in that it is a blind rivet together with a rivet body including a hollow sleeve and a flange formed at one end of the sleeve; and the mandrel comprises: elongated a shaft portion and a mandrel head formed at one end of the shaft portion and having an outer diameter larger than the shaft portion; and the mandrel head has a head on a side opposite to the shaft portion through a center axis of the mandrel a groove; and the head grooves are linear and arranged at equal intervals.

If the head portion of the mandrel includes a head groove, when the blind rivet is fastened, the mandrel head is easily bent from the head groove toward the central axis side and reduced in diameter, and is easily inserted into the through hole of the rivet body. Therefore, the mandrel can be pulled out through the through hole of the rivet body with a small force.

A fifth aspect of the present invention is a fastening method characterized by a method of fastening a mounted member including a mounting hole by a blind rivet; and comprising the steps of: preparing a rivet body and a mandrel, here, The rivet body includes: a hollow sleeve and a flange formed at one end of the sleeve, and a through hole penetrating from the sleeve side end portion to the flange side end portion; and the sleeve includes: adjacent to the above a thick portion of the flange and a thin portion having an inner diameter larger than the thick portion adjacent to the thick portion; the mandrel includes an elongated shaft portion having an outer diameter equal to an inner diameter of the thick portion or And the outer diameter of the mandrel head is larger than the inner diameter of the thick portion; and on the opposite side of the mandrel head from the shaft portion, a head for reducing the diameter of the mandrel head is formed. Slot; and a blind rivet is formed by combining the rivet body and the mandrel such that the shaft portion of the mandrel extends from the through-hole of the rivet body from the flange-side end portion; and the blind rivet is from the core Inserting the shaft head into the mounting hole of the mounted member, and abutting the sleeve side surface of the flange against the mounting hole of the mounted member to support the flange and from the flange side Pulling out the shaft portion of the mandrel, and the thick portion is expanded by the mandrel head to form an enlarged diameter portion; the mandrel head is tightened by the enlarged diameter portion, and the head groove is folded The reduced diameter portion is bent, and the reduced diameter portion is pulled out through the through hole of the rivet body without being broken from the shaft portion; and the mounted member is fastened to the enlarged diameter portion of the rivet body Between the above flanges.

According to the present invention, it is possible to provide a pull-type blind rivet which can press the member to be mounted with sufficient crimping force.

Further, a pull-type blind rivet that can be mounted with a small mounting load can be provided.

Further, a small pull-type blind rivet that can be mounted to a small mounting hole can be provided.

10‧‧‧ rivet body

11‧‧‧Sleeve

12‧‧‧Flange

13‧‧‧through holes

14‧‧‧ Thin wall

15‧‧‧ Thick Wall

15a‧‧‧Extended section

16‧‧ ‧ step

17‧‧‧ Hole Department

20‧‧‧ mandrel

21‧‧‧Axis

23‧‧‧ mandrel head

23a‧‧‧Reducing section

24‧‧‧ head slot

24a‧‧‧Bending groove

25‧‧‧ top

41‧‧‧Installed components

42‧‧‧Installed components

43‧‧‧Installation holes

44‧‧‧Installation holes

50‧‧‧Front edge film

D11‧‧‧ OD

D14‧‧‧Inner diameter

D15‧‧‧Inner diameter

D21‧‧‧ OD

D23‧‧‧ outside diameter

L14‧‧‧ length

L15‧‧‧ length

Lp‧‧‧ central axis

X‧‧‧ direction

Y‧‧‧ direction

Z‧‧‧ direction

‧‧‧‧ angle

Fig. 1 is a perspective view of a blind rivet according to an embodiment of the present invention.

Figure 2 is a partial cross-sectional view of the blind rivet of Figure 1.

Fig. 3 is a cross-sectional view showing the rivet body of the blind rivet according to the embodiment of the present invention.

Figure 4 is a front elevational view of the mandrel of the blind rivet of the embodiment of the present invention.

Figure 5 is a side view of the mandrel of Figure 4.

Figure 6 is a computer generated diagram of the blind rivet of Figure 1.

Figure 7 is a view showing the attachment of the blind rivet of the embodiment of the present invention to the member to be mounted. Computer graphics generated from a partial profile of the state.

Fig. 8 is a partial cross-sectional view showing a state in which the mandrel is slightly pulled out from the state of Fig. 7.

Fig. 9 is a partial cross-sectional view showing a state in which the mandrel is further pulled out from the state of Fig. 8.

Fig. 10 is a partial cross-sectional view showing a state in which the mandrel is completely pulled out from the state of Fig. 9.

Hereinafter, a blind rivet according to an embodiment of the present invention will be described with reference to the drawings.

1 is a perspective view of a blind rivet according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional front view. The blind rivet comprises: a rivet body 10 and a mandrel 20. The mandrel head 23 is disposed adjacent to the end of the rivet body 10 on the sleeve 11 side. The central axis of the blind rivet is indicated by lp. The central axis of the rivet body 10 and the mandrel 20 is also indicated by lp.

Hereinafter, the rivet body 10 and the mandrel 20 constituting the blind rivet according to the embodiment of the present invention will be described with reference to Figs. 3 and 4 .

Fig. 3 is a cross-sectional view showing the rivet body 10 of the embodiment of the present invention. The rivet body 10 includes a cylindrical sleeve 11 and a flange 12 formed at one end of the sleeve 11 and having a larger diameter than the sleeve 11. The sleeve 11 has a thin portion 14 that is adjacent to the flange 12, and a thick portion 15 that is provided on the side of the sleeve-side end and has a larger wall thickness than the thin portion 14. A step 16 is formed between the thick portion 15 of the through hole 13 and the thin portion 14.

The length of the thin portion 14 is preferably equal to or slightly larger than the total thickness of the member to be mounted, and the length L14 of the thin portion 14 is long. The thick portion 15 is for expanding the diameter to form a portion of the enlarged diameter portion, and the length L15 of the thick portion 15 is short.

A through hole 13 extends between the flange side end portion of the rivet body 10 and the sleeve side end portion. The outer diameter of the thick portion 15 and the thin portion 14 is D11. The inner diameter d15 of the thick portion 15 is smaller than the inner diameter d14 of the thin portion 14.

The outer diameter D11 of the sleeve 11 is smaller than the inner diameters of the mounting holes 43, 44 of the mounted members 41, 42, and can pass through the size of the mounting holes 43, 44.

The rivet body 10 is made of a softer material than the mandrel 20, such as aluminum, aluminum alloy, or the like. Further, it may be made of the same steel material as the mandrel 20 or the like.

Fig. 4 is a front view of the mandrel 20 of the embodiment of the present invention, and Fig. 5 is a side view. The mandrel 20 includes an elongated shaft portion 21 and a mandrel head 23 at an end opposite to the shaft portion 21. The shaft portion 21 has a cylindrical shape, and the outer diameter D21 of the shaft portion 21 is substantially equal to or slightly smaller than the inner diameter d15 of the thick portion 15 of the rivet body 10, so that the shaft portion 21 can completely conform to the thick portion 15. It is inserted into the through hole 13. The outer diameter D21 of the shaft portion 21 is smaller than the inner diameter d14 of the thin portion 14 of the rivet body 10. In a state where the rivet body 10 is inserted and mounted with the mandrel 20, there is a gap between the outer surface of the shaft portion 21 of the mandrel 20 and the inner surface of the thin portion 14 of the rivet body 10.

The outer diameter D23 of the mandrel head 23 is larger than the inner diameter d14 of the thin wall portion 14 of the rivet body 10, and is substantially equal to the outer diameter D11 of the sleeve 11 of the rivet body 10.

The outer diameter of the mandrel head 23 is smaller than the inner diameters of the mounting holes 43, 44 of the mounted members 41, 42, and can pass through the mounting holes 43, 44 of the mounted members 41, 42.

On the surface of the mandrel head 23 (on the left side of FIG. 4), the V-shaped head groove 24 extends linearly in the radial direction from the position on the central axis lp. The head grooves 24 are formed at equal intervals around the central axis lp. The head groove 24 is formed at an angle α of approximately 90° with respect to the central axis lp.

The portion of the head groove 24 is thinner in the axial direction of the mandrel head 23, and the angle α of the head groove 24 is slightly less than 90 degrees. When the blind rivet is tightened, the mandrel head 23 is easily bent and reduced in diameter from the head groove 24. The mandrel head 23 can be reduced in diameter and easily passed through the through hole 13 of the rivet body 10.

The portion between the adjacent two head grooves 24 becomes the top 25 of the ridge. In the illustrated embodiment, there are four tops 25.

Further, the number of the head grooves 24 is not limited to four. The mandrel 20 is made of steel or the like and is galvanized.

Fig. 6 is a computer generated diagram of a blind rivet in which the rivet body 10 and the mandrel 20 of the embodiment of the present invention are combined. See also Figures 1 and 2.

The mandrel 20 is inserted from the front end of the shaft portion 21 from the sleeve side end portion of the through hole 13 of the rivet body 10. The mandrel head 23 abuts against the end of the thick portion 15 of the sleeve 11. The shaft portion 21 of the mandrel 20 is fitted to the inner diameter of the thick portion 15 of the rivet body 10. There is still a slight gap between the shaft portion 21 and the inner side of the thin portion 14.

The operation of fastening the members 41 and 42 to be attached by the blind rivets according to the embodiment of the present invention will be described. Fig. 7 is a partial cross-sectional view showing a state in which blind rivets are attached to the members to be mounted 41, 42. The mandrel 20 is inserted into the through hole 13 from the side of the sleeve side end portion of the rivet body 10 with the shaft portion 21 as the front end.

Thus, the blind rivet in which the rivet body 10 and the mandrel 20 are combined is the front end of the mandrel head 23, and the hole 43 of the member to be mounted 41, 42 is inserted from the lower side of FIG. 7 (the side of the member to be mounted 42), 44, and the flange 12 of the rivet body 10 abuts against the member to be mounted 42.

The length of the thin portion 14 is equal to or slightly longer than the total thickness of the members to be mounted 41, 42. In a state where the flange 12 abuts against the member to be mounted 12, the thick portion 15 projects above the inner side of the mounting hole 43 of the mounting member 41. In order to smoothly expand the thick portion 15 to form the enlarged diameter portion 15a, the thick portion 15 preferably protrudes upward from the inner side of the attachment hole 43 of the attachment member 41, and the outer portion is not restrained by the attachment hole 43.

From the state of Fig. 7, the end face of the flange 12 of the rivet body 10 is held from the lower side by the mounting tool nose piece 50, and the axis of the mandrel 20 is held by the holding member (not shown) of the mounting tool. The portion 21 is pulled out in the downward direction.

FIG. 8 shows the step of the mandrel head 23 entering the thick wall portion 15 of the rivet body 10.

At this time, the mandrel head 23 presses the thick portion 15 of the sleeve 11 of the rivet body 10 to expand it. Since the thick portion 15 protrudes upward from the attachment hole 43 of the attachment member 41, the outer side is not restrained by the attachment hole 43 and is easily expanded in diameter. The outer diameter of the thin portion 15 becomes larger than the inner diameters of the attachment holes 43 and 44 of the attachment members 41 and 42, and becomes the enlarged diameter portion 15a.

Since the thick portion 15 is easily expanded in diameter, the material of the thick portion 15 is hardly pulled into the inner side of the thin portion 14. Since the enlarged diameter portion 15a is located above the mounting hole 43 of the mounted member 41, and the outer diameter of the enlarged diameter portion 15a is larger than the inner diameters of the mounting holes 43, 44 of the mounted members 41, 42, the rivet body 10 is not self-contained. The mounting members 41, 42 are detached.

The mandrel head portion 23 is contracted by the enlarged diameter portion 15a of the rivet body 10 to become the reduced diameter portion 23a. The head groove 24 is bent to become the bending groove 24a. The mandrel head portion 23 is a reduced diameter portion 23a and is gradually pulled into the through hole 13.

In FIG. 8, the reduced diameter portion 23a is located above the mounting holes 43, 44 of the mounted members 41, 42 and is not pulled into the inside of the mounting holes 43, 44.

Fig. 9 is a perspective view showing a step of further tightening the inner diameter of the reduced diameter portion 23a to the inner side of the thin portion 14 of the rivet body 10. The enlarged diameter portion 23a is still located inside the mounting holes 43, 44 of the mounted members 41, 42.

When the mandrel head 23 passes through the inner side of the thick portion 15, the outer diameter is contracted to become the reduced diameter portion 23a, but the outer diameter of the reduced diameter portion 23a is slightly larger than the outer diameter D21 of the shaft portion 21 to bulge. The inner diameter d14 of the thin portion 14 is larger than the inner diameter d15 of the thick portion 15. When the reduced diameter portion 23a passes through the inner side of the thin portion 14, the inner surface of the thin portion 14 is hardly cut, but the inner surface of the thin portion 14 is slightly indented by the bulging portion of the reduced diameter portion 23a. The face.

Further, the reduced diameter portion 23a presses the thin portion 14 in the outward direction, and the thin portion 14 is pressed against the inner surfaces of the attachment holes 43 and 44 of the attachment members 41 and 42.

Therefore, in the step of pulling the reduced diameter portion 23a into the inner side of the thin portion 14, the reduced diameter portion 23a can advance in the through hole 13 with less resistance. When the reduced diameter portion 23 is pulled out from the inner side of the thin portion 14, the thin portion 14 is not stretched in the central axis direction.

Fig. 10 shows a state in which the mandrel 20 is further pulled out, and the reduced diameter portion 23a is extended from the flange side end portion through the through hole 13 of the rivet body 10. The mounted members 41, 42 are fastened between the flange 12 and the enlarged diameter portion 15a.

Then, the mandrel 20 is removed, and the front edge piece 50 of the installation tool is removed, and the fastening is terminated. Work.

According to the present invention, the sleeve 11 of the rivet body 10 does not extend in the axial direction by the mandrel head 23. Therefore, the members to be mounted 41, 42 can be fastened with sufficient crimping force.

Further, the blind rivet of the embodiment of the present invention can be fastened with a small mounting load.

The blind rivet of the embodiment of the present invention is particularly suitable for fastening a member to be mounted having a small mounting hole having an inner diameter of about 1 mm.

10‧‧‧ rivet body

11‧‧‧Sleeve

12‧‧‧Flange

13‧‧‧through holes

14‧‧‧ Thin wall

15‧‧‧ Thick Wall

16‧‧ ‧ step

20‧‧‧ mandrel

21‧‧‧Axis

23‧‧‧ mandrel head

24‧‧‧ head slot

25‧‧‧ top

Claims (10)

A blind rivet characterized by comprising: a rivet body comprising a hollow sleeve and a flange formed at one end of the sleeve, and formed to penetrate from the sleeve side end portion to the flange side end portion a through hole; and a mandrel, comprising: an elongated shaft portion; and a mandrel head formed at one end of the shaft portion and having an outer diameter larger than an inner diameter of the through hole of the sleeve; and the rivet body is tight Fixing the member, and when the shaft portion of the mandrel is pulled out, the end portion of the sleeve is expanded by the pressing of the mandrel head; the mandrel head may not be broken from the shaft portion And pulling out through the through hole of the rivet body; and forming a head groove for reducing the diameter of the mandrel head on a side opposite to the shaft portion of the mandrel head. The blind rivet of claim 1, wherein the head groove extends linearly in a radial direction from a central axis of the mandrel. A blind rivet according to claim 1 or 2, wherein the above-mentioned head grooves are provided at equal intervals. The blind rivet of claim 1 or 2, wherein the sleeve of the rivet body comprises: a thin portion adjacent to the flange, and an end portion provided on an opposite side of the flange and having an inner diameter smaller than the thin portion Thick wall. The blind rivet of claim 4, wherein an outer diameter of the shaft portion of the mandrel is equal to or smaller than an inner diameter of the thick portion of the rivet body, and smaller than an inner diameter of the thin portion. The blind rivet of claim 4, wherein when the shaft portion of the mandrel is pulled out, the thick portion of the rivet body is expanded by the mandrel head to form an enlarged diameter portion; The mandrel head is tightened by the thick portion, and is bent at the head groove to form a reduced diameter portion. The reduced diameter portion of the mandrel can be pulled out through the through hole. A blind rivet characterized by comprising: a rivet body comprising a hollow sleeve and a flange formed at one end of the sleeve, and formed to penetrate from the sleeve side end portion to the flange side end portion a through hole; and a mandrel, comprising: an elongated shaft portion; and a mandrel head formed at one end of the shaft portion and having an outer diameter larger than an inner diameter of the through hole of the sleeve; and the rivet body is tight Fixing the member, and when the shaft portion of the mandrel is pulled out, the end portion of the end portion of the sleeve is expanded by the pressing of the mandrel head; the mandrel head may not be from the above The shaft portion is detached by the through hole of the rivet body; and the sleeve of the rivet body includes a thin portion adjacent to the flange and an end portion provided on a side opposite to the flange The inner diameter is smaller than the thick portion of the thin portion. A rivet body, characterized in that it is a blind rivet together with a mandrel, and comprises: a hollow sleeve and a flange formed at one end of the sleeve; and the sleeve comprises: adjacent to the flange a thin portion and a thick portion having an inner diameter smaller than an end portion of the opposite side of the flange and having an inner diameter smaller than the thin portion. A mandrel characterized in that it comprises a blind rivet together with a rivet body comprising a hollow sleeve and a flange formed at one end of the sleeve; and the mandrel comprises: an elongated shaft portion, and is formed on the above One end of the shaft portion and having an outer diameter larger than a mandrel head of the shaft portion; and The mandrel head has a head groove that passes through a central axis of the mandrel on a side opposite to the shaft portion, and the head grooves are linear and are provided at equal intervals. A fastening method, characterized in that it is a method of fastening a mounted member including a mounting hole by a blind rivet; and comprising the steps of: preparing a rivet body and a mandrel, wherein the rivet body comprises: a hollow sleeve, And a flange formed at one end of the sleeve and having a through hole penetrating from the sleeve side end portion to the flange side end portion; and the sleeve includes: a thick portion adjacent to the flange, and abutting a thin-walled portion having an inner diameter larger than the thick portion; the mandrel comprising: an elongated shaft portion having an outer diameter equal to or smaller than an inner diameter of the thick portion; and a mandrel head The outer diameter is larger than the inner diameter of the thick portion; and the head groove of the mandrel head opposite to the shaft portion is formed with a head groove for reducing the diameter of the mandrel head; a rivet body and the mandrel are combined to form a blind rivet by extending from the flange side end portion through the through hole of the rivet body, and the blind rivet is inserted into the shank from the mandrel head The above mounting holes of the mounting member, Abutting the surface of the sleeve on the sleeve side against the mounting hole of the mounting member to support the flange, and pulling out the shaft portion of the spindle from the flange side, and the thick wall The portion is expanded by the diameter of the mandrel head, and the mandrel head is contracted by the enlarged diameter portion, and is bent at the head groove to form a reduced diameter portion, and the reduced diameter portion The member to be attached may be pulled out through the through hole of the rivet body without breaking from the shaft portion; and the member to be mounted may be fastened between the enlarged diameter portion of the rivet body and the flange.