JP2002195226A - Blind rivet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blind rivet enhanced in reliability capable of obtaining a strong coupling force for coupling members. SOLUTION: The blind rivet 1 is composed of: a rivet body 2 having a dished head 21 provided with a rotating means at its end face and a cylinder section 22 protruded from the side of a reverse-rotating means of the dished head 21; and a shaft 3 fitted with a drill having a shaft section 32 inserted to a shaft through hole of the rivet body 2 and a drill section 31 for drilling a lower hole of a coupling member being coupled 10 at the end of the shaft section 32. A male thread 23 of which the dimension is smaller than the thickness of the coupling member 10 is cut on the cylinder section 22 of the blind rivet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of blind rivets for mechanically connecting members to be connected.

[0002]

2. Description of the Related Art In a blind rivet, a blind hole is drilled in a member to be joined by a drill, a blind rivet is inserted into the blind hole, and a shaft portion is pulled out from the blind rivet. Then, when the shaft portion is pulled out, the member to be joined is joined by pushing and expanding the end of the blind rivet on the opposite side of the head by a tip portion having a larger diameter than the shaft portion of the shaft portion. It becomes something.

[0003] In the blind rivet according to the prior art 1, as described above, it is necessary to previously drill a hole in the member to be joined. There was a problem that sufficient bonding strength could not be obtained due to poor adhesion to the substrate.
Therefore, a drill portion having a diameter larger than that of the shaft portion is formed at the tip of the shaft portion, so that it is not necessary to drill a pilot hole in the member to be joined, thereby improving the efficiency of joining work of the member to be joined. A blind rivet has been proposed, for example, in Japanese Patent Application Laid-Open No. 9-158929.

The outline of the blind rivet according to the conventional example 2 will be described in the same publication with reference to FIGS. 4 (a), 4 (b) and 4 (c) which show a blind rivet and an example of its application. To describe the same reference numerals, a blind rivet for joining a steel plate, which is a member to be joined, from one side is provided with an inverted truncated cone-shaped dish-shaped or pan-shaped head 1.
2, a rivet body composed of a cylindrical portion protruding from the small diameter portion of the head 12, a shaft 13 inserted into the rivet body, and a tip of the shaft 13 having a diameter exceeding the diameter of the shaft 13. It has a diameter and a drilling part having a self-drilling function, and is further provided with a pointed part 15 at the tip thereof.

[0005]

According to the blind rivet according to the conventional example 2 (Japanese Patent Application Laid-Open No. 9-158929), a pilot hole can be formed in the member to be joined at the drilling portion. In addition, since it is not necessary to previously drill a prepared hole in the member to be joined, it is considered to be useful as such. However, similarly to the blind rivet according to the above-mentioned conventional example 1, since the adherence between the member to be joined and the blind rivet is poor, the opposing force of the connecting portion against the rotational force around the blind rivet is weak, and vibration There is a problem to be solved that the reliability is poor from a long-term viewpoint, since the joints become loose or worn due to repetition.

Accordingly, an object of the present invention is to provide a highly reliable blind rivet capable of obtaining a strong coupling force with a member to be coupled.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances. Therefore, in order to solve the above-mentioned problems, the features of the means adopted by the blind rivet according to claim 1 of the present invention. A rivet body having a head portion and a cylindrical portion having a smaller diameter than the head portion is provided, a drill portion is provided at a distal end portion, and the drill portion is provided at a base end side of the drill portion. An outer surface of a cylindrical portion of the rivet body in a blind rivet for mechanically connecting a member to be joined, the shaft having a drill having a smaller diameter and having a shaft portion inserted into the rivet body. And the pitch of the grooves or the convex portions is set to be smaller than the thickness of the member to be joined.

According to a second aspect of the present invention, there is provided a blind rivet according to the first aspect, wherein the blind rivet has a groove formed on an outer surface of the rivet body and the cylindrical rivet has a groove. The outer surface of the part has a larger diameter than the drill part.

A feature of the means adopted by the blind rivet according to the third aspect of the present invention is that, in the blind rivet according to the first aspect, a convex portion is provided around the outer surface of the rivet main body. The outer diameter of the convex portion is larger than the diameter of the drill portion.

A feature of the means adopted by the blind rivet according to claim 4 of the present invention is that, in the blind rivet according to claim 3, the outer surface of the cylindrical portion is smaller in diameter than the drill portion. is there.

A feature of the means adopted by the blind rivet according to claim 5 of the present invention is that in the blind rivet according to claim 4, the convex portion is a male screw.

A feature of the means adopted by the blind rivet according to claim 6 of the present invention is that in the blind rivet according to claim 5, the effective diameter of the male screw is twice the thickness of the member to be joined. This is where the settings are made.

A feature of the means employed by the blind rivet according to claim 7 of the present invention is that, in the blind rivet according to claim 2, the effective diameter of the groove is twice the thickness of the member to be joined. This is where the settings are made.

A feature of the means employed by the blind rivet according to claim 8 of the present invention is that in the blind rivet according to any one of claims 1 to 7, a head of the rivet body is provided. Is formed in an inverted truncated cone shape.

A feature of the means employed by the blind rivet according to claim 9 of the present invention is that in the blind rivet according to any one of claims 1 to 8, a head of the rivet body is provided. The rotation means is formed on the end surface on the side opposite to the cylindrical portion of the above.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a blind rivet according to a first embodiment of the present invention is shown in FIG.
FIG. 1 (b) of the external view of the rivet body, FIG. 1 (c) of the external view of the shaft with a drill, FIG. 1 (d) of the configuration explanatory view of the rotary tool, and the member to be joined. The description will be made with reference to FIG.

Reference numeral 1 shown in FIG. 1 denotes a first embodiment of the present invention.
Is a blind rivet according to. The blind rivet 1 includes a rivet body 2 having a configuration described later and a shaft 3 with a drill, and the material thereof is, for example, a general steel material.

The rivet main body 2 is shown in FIG.
As shown in FIG. 2B, the head 21 has an inverted trapezoidal shape, that is, a dish-shaped dish-shaped head 21, and a cylindrical portion 22 having a smaller diameter than the dish-shaped head 21. On the flat end surface of the dish-shaped head 21 on the side opposite to the cylindrical portion, a + -shaped rotating means (may be a − shape or a hexagonal hole) is formed. A male screw 23 is threaded. The pitch of the male screw 23 is set to be smaller than the thickness of the joined member 10 such as a plate to be joined, and the effective diameter is set to be twice or more the thickness of the joined member 10.

At the center of the rivet body 2 in the radial direction, there is provided a shaft insertion hole 24 into which a shaft portion of the shaft 3 with a drill having a configuration described later is inserted. The rivet main body 2 has a dish-shaped head 21, and when the member 10 is joined, the dish-shaped head 21
Can be flush with the outer surface of the member 10 to be joined.
There is an effect that unevenness does not occur.

The cylindrical portion 2 of the rivet body 2
The reason why the pitch of the male screw 23 formed on the outer peripheral surface of the cylindrical member 22 is set to be smaller than the thickness of the member to be coupled 10 such as a plate to be coupled is as described above. This is for improving the adhesion to the member 10. The reason why the effective diameter of the male screw 23 is set to be at least twice the thickness of the member to be joined 10 is in consideration of the torsional strength and the buckling strength of the cylindrical portion 22.

The shaft 3 with a drill is shown in FIG.
As shown in (c), a pointed portion 31a is formed at the tip end, and a tapered portion 31b is formed on the opposite side of the pointed portion 31a.
Is formed. And
From the base end side of the tapered portion 31b side of the drill portion 31,
The shaft portion 32 having a smaller diameter than the drill portion 31 is provided so as to protrude. In this case, the maximum diameter of the drill portion 31 is the same as that of the cylindrical portion 22 of the rivet body 2.
The diameter of the male screw 23 is set to be slightly smaller than the thread portion 23 a and slightly larger than the cylindrical portion 22.

Therefore, the shaft portion 32 of the shaft 3 with a drill is inserted into the shaft insertion hole 24 of the rivet body 2.
, A blind rivet 1 having a configuration as shown in FIG. 1A is formed.

When the member 10 to be joined is joined by the blind rivet 1 having the above structure,
A rotating tool 4 having a configuration as shown in FIG. 1D is used. The rotating tool 4 is provided at its tip with the dish-shaped head 21.
And an inner engaging portion 42 that engages with a protruding portion of the shaft portion 32 of the shaft 3 with a drill from the rivet body 2. That is, the rotating tool 4 is gripped by a drill chuck such as an electric drill (not shown), and the end engaging portion 41 is held.
Is engaged with the rotating means of the dish-shaped head 21 and the inner engaging portion 42 is engaged with a protruding portion of the shaft portion 32 from the rivet body 2, so that the rivet body 2 and the drilled shaft 3 are The drill unit 31 is configured to be able to rotate at the same rotation speed.

The use of the blind rivet 1 having the above structure will be described below. The dish-shaped head 21 of the blind rivet 1 in which the shaft portion 32 of the shaft 3 with a drill is inserted into the shaft insertion hole 24 of the rivet body 2 is described. And the inner engaging portion 42 of the rotating tool 4 is engaged with the end engaging portion 41 of the rotating tool 4 and the protruding portion of the shaft portion 32 from the rivet body 2. Then, the tip of the sharp portion 31a of the drill portion 31 is aligned with the joining target position of the joined member 10 to be joined, and the rotating tool 4 is gripped by a drill chuck such as an electric drill (not shown) to apply a pressing force. When the rotating tool 4 is rotated, a prepared hole is made in the joined member 10 by the rotating drill portion 31, and the cylindrical portion 22 of the rivet body 2 is inserted into the prepared hole while rotating.

Next, when a pulling force is applied to the shaft portion 32, the cylindrical portion 22 of the rivet main body 2 is compressed and contracted, the outer dimension is enlarged, and the tip thereof is tapered of the drill portion 31 of the shaft portion 32. The end of the cylindrical portion 22 of the rivet body 2 whose width is expanded by being spread by the portion 31b and whose one surface side to be coupled is joined by the dish-shaped head 21 and whose other surface side is expanded by being extended. The parts are tightened and joined.

In the joined state of the joined members 10, as described above, the pitch of the male screw 23 is set smaller than the thickness of the joined members 10 such as plates to be joined.
The external thread 2 is expanded by increasing the outer dimension of the cylindrical portion 22.
Since the thread portion 23a of No. 3 bites into the inner peripheral surface of the prepared hole drilled by the drill portion 31, the rivet body is more connected than the blind rivet according to the conventional example 2 in which the outer peripheral surface of the rivet body has a smooth cylindrical shape. Excellent adhesion to members.

Therefore, according to the blind rivet 1 according to the first embodiment, the rotational force of the connecting portion centered on the blind rivet 1 is stronger than that of the blind rivet according to the second conventional example. Since the loosening and abrasion of the connecting portion hardly occur even by the repetition of the vibration, a great effect that the reliability of the connecting portion is improved can be obtained. If the appearance of the drill portion 31 becomes a problem after the connection of the members 10 to be connected,
Can be cut.

Hereinafter, a blind rivet according to the second embodiment of the present invention will be described. However, Embodiment 2 of the present invention
The difference between the blind rivet according to the first embodiment and the blind rivet according to the first embodiment lies in the difference in the configuration of the rivet main body, and the remaining configuration is the same as that of the blind rivet according to the first embodiment. Referring to FIG. 2 (a) of the external view of the rivet body and FIG. 2 (b) of the explanatory view of the coupling state of the members to be coupled, the same components and components having the same functions are denoted by the same reference numerals. The differences will be described.

The rivet body 2 of the blind rivet 1 according to the second embodiment has a dish-shaped dish-shaped head 21 as shown in FIG. A cylindrical portion 22 having a diameter smaller than that of the dish-shaped head 21 and having an outer edge portion chamfered is formed, and a plurality of portions (three portions in the second embodiment) are formed on the outer peripheral surface of the cylindrical portion 22. ) Is formed. In the second embodiment, the rotating means is not formed on the side of the dish-shaped head 21 opposite to the cylindrical portion. However, the rotating means may be formed as in the first embodiment. The outer edge of the end face of the cylindrical portion 22 is chamfered. This is for facilitating insertion into a hole formed in the member to be coupled 10 by the shaft 3 with a drill. There may be. Further, even if there is no chamfer or R, there is no practical problem.

The pitch of the grooves 23 is set to be smaller than the thickness of the member 10 such as a plate to be connected, and the effective diameter of the groove is set to be at least twice the thickness of the member 10 to be connected. Have been. The shaft portion 32 of the shaft 3 with a drill is inserted into a shaft insertion hole 24 formed at a position of a center line passing through the center in the radial direction of the rivet main body 2. The outer surface of the cylindrical portion 22 of the rivet main body 2 is set slightly larger than the maximum diameter of the drill portion 31. The effective diameter of the groove refers to the diameter of the minimum diameter of the groove.

Therefore, according to the blind rivet 1 according to the second embodiment, when a pulling force is applied to the shaft portion 32 as shown in FIG. Similarly to the case, the cylindrical portion 22 of the rivet main body 2 is reduced in size and the outer dimension is increased, and the leading end is pushed and expanded by the tapered portion 31b of the drill portion 31 of the shaft portion 32, so that the width is increased and the rivet body is joined. One side of the member to be joined is fastened by the dish-shaped head 21 and the other side is fastened and joined by the distal end of the cylindrical portion 22 of the rivet body 2 whose width is expanded by being spread. The second embodiment has the same effect as the first embodiment, because the convex portion 23a between the first and second holes bites into the inner peripheral surface of the prepared hole drilled by the drill portion 31.

Hereinafter, a blind rivet according to a third embodiment of the present invention will be described with reference to FIG. 3 (a) showing an overall external view of the blind rivet, FIG. FIG. 3C of the explanatory diagram will be described. However, the difference between the blind rivet according to the third embodiment of the present invention and the blind rivet according to the first embodiment lies in the difference in the configuration of the rivet main body. Since the blind rivet has the same configuration as the blind rivet, the same components and those having the same functions are denoted by the same reference numerals and described.

The rivet body 2 of the blind rivet 1 according to the third embodiment has a dish-shaped dish-shaped head 21 having a flat end face formed with a + -shaped rotating means.
A cylindrical portion 22 having a diameter smaller than that of the dish-shaped head 21 is formed on the side opposite to the rotating means 1 and a male screw 23 is formed on the outer peripheral surface of the cylindrical portion 22. Of course, the pitch of the male screw 23 is set to be smaller than the thickness of the joined member 10 such as a plate to be joined, and the effective diameter thereof is set to be twice or more the thickness of the joined member 10. Is set.
The length of the cylindrical portion 22 of the male screw 23 in the longitudinal direction is 1
The thickness from the head of the plate-shaped head 21 to the start of threading of the male screw 23 exceeds the thickness of one of the members to be connected 10 and the thickness of the two members Coupling member 10
The thickness is set to be less than the thickness.

Therefore, according to the blind rivet 1 according to the third embodiment, as shown in FIG. 3C, when the members to be connected 10 are connected, any one of the two members to be connected 10 is used. The thread 2 of the male screw 23 is also provided on the inner peripheral surface of the pilot hole.
Since 3a digs in, the same effect as the blind rivet according to the first embodiment can be obtained.

In the first to third embodiments, a blind rivet made of a general steel material has been described as an example. However, it does not have to be made of a general steel material, and it can be made of, for example, stainless steel, a high-strength aluminum alloy, a high-strength copper alloy, or the like. This is particularly effective for joining thin joined members such as those that cannot be welded sufficiently or are difficult to weld, for example, non-ferrous metals such as iron-aluminum and aluminum-aluminum. In the above, the case where the head of the rivet main body 2 is a “dish-shaped head” has been described as an example, but it may be, for example, a “pan-shaped head”.

[0036]

As described above in detail, according to the blind rivet according to the first to ninth aspects of the present invention, the blind rivet is formed on the outer peripheral surface of the cylindrical portion in a state where the members to be joined are joined by the blind rivet. The pitch of the groove or the convex portion is set to be smaller than the thickness of the member to be joined, and the convex or convex portion between the groove and the groove is formed by enlarging the outer dimension of the cylindrical portion. Will bite into the inner peripheral surface of the pilot hole drilled by the drill portion, so that the rivet body has better adhesion to the member to be joined than the blind rivet according to Conventional Example 2 in which the outer peripheral surface is a smooth cylindrical shape. ing. Then, it is possible to reduce the variation in the bonding strength irrespective of the state of the prepared hole.

Therefore, according to the blind rivet according to the first to ninth aspects of the present invention, the adhesiveness of the connecting portion to the rotational force centered on the blind rivet is superior to the blind rivet according to the second conventional example. Therefore, since the joint portion is not easily loosened or worn even by repeated vibration, a great effect that the corrosion resistance is excellent and the reliability of the joint portion is improved can be obtained.

According to the blind rivet according to claims 2 to 5 of the present invention, the inner surface of the pilot hole drilled in the member to be joined by the drill portion has a surface between the grooves of the cylindrical portion. The part, the convex part or the male screw bites into, and the member to be connected is securely connected.

According to the blind rivet according to the sixth aspect of the present invention, the effective diameter of the male screw is set to be at least twice the thickness of the member to be joined, and according to the blind rivet according to the seventh aspect of the present invention, The effective diameter of the groove is set to more than twice the thickness of the member to be joined, and in addition to high buckling strength,
Since the torsion strength is high, the rivet body can be inserted into the pilot hole without being bent or twisted.

According to the blind rivet according to the eighth aspect of the present invention, the head of the rivet body of the blind rivet is formed in an inverted truncated cone shape, and when the members to be coupled are coupled, the upper surface of the head is formed. Since the outer surface of the member to be coupled can be flush with the outer surface, there is an effect that no unevenness is generated when another member is overlapped on the joint.

According to the blind rivet of the ninth aspect of the present invention, since the rotating means is formed on the end surface of the head of the rivet body on the side opposite to the cylindrical portion, the rotation of the rivet body by the rotating means is performed. Lower the insertion resistance,
The cylindrical portion of the rivet body can be inserted into the pilot hole.

[Brief description of the drawings]

1 (a) is an overall external view of a blind rivet, FIG. 1 (b) is an external view of a rivet body of a blind rivet, and FIG. 1 (c) is a blind rivet. Of a shaft with a drill, Fig. 1
FIG. 1D is an explanatory view of a configuration of a tool for rotating a blind rivet, and FIG. 1E is an explanatory view of a connected state of members to be connected.

FIG. 2A is an external view of a rivet body of a blind rivet according to the second embodiment of the present invention, and FIG.
FIG. 4 is an explanatory view of a connected state of members to be connected.

3 (a) is an overall external view of a blind rivet, FIG. 3 (b) is an external view of a rivet body of the blind rivet, and FIG. FIG. 5 is an explanatory view of a connected state of members.

4 (a), 4 (b) and 4 (c) according to Conventional Example 2;
FIG. 3 is a view showing a blind rivet and an example of the construction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... blind rivet 2 ... rivet main body, 21 ... dish-shaped head, 22 ... cylindrical part, 2
Reference numeral 3 indicates a male screw or groove, 23a indicates a thread portion or a convex portion, 24 indicates a shaft insertion hole, 3 indicates a shaft with a drill, 31 indicates a drill portion, 31a indicates a pointed portion, 31b indicates a tapered portion, 32 indicates a shaft portion, and 4 indicates a rotating portion. Tool, 41: End engaging part, 42: Inner engaging part 10: Member to be joined

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masao Kibuchi 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kobe Research Institute, Kobe Steel Ltd. (72) Inventor Shuichi Aimoto Nishi-ku, Kobe City, Hyogo Prefecture 1-5-5 Takatsukadai Kobe Steel, Ltd. Kobe Research Institute F-term (reference) 3J036 AA05 BA02 BB05 FA06

Claims (9)

[Claims] 1. A rivet body having a head portion and a cylindrical portion having a smaller diameter than the head portion, a drill portion at a distal end portion, and a drill portion at a base end side of the drill portion. An outer surface of a cylindrical portion of the rivet body in a blind rivet for mechanically connecting a member to be joined, the shaft having a drill having a smaller diameter and having a shaft portion inserted into the rivet body. A blind rivet, wherein a groove or a convex portion is provided around the member and a pitch of the groove or the convex portion is set to be smaller than a thickness of the joined member. 2. The blind rivet according to claim 1, wherein a groove is provided on an outer surface of the rivet body, and an outer surface of the cylindrical portion is larger in diameter than the drill portion. 3. The blind rivet according to claim 1, wherein a convex portion is provided on an outer surface of the rivet main body, and an outer diameter of the convex portion is larger than that of the drill portion. 4. The blind rivet according to claim 3, wherein the outer surface of the cylindrical portion has a smaller diameter than the drill portion. 5. The blind rivet according to claim 4, wherein said convex portion is a male screw. 6. The blind rivet according to claim 5, wherein the effective diameter of the male screw is set to be twice or more the thickness of the member to be joined. 7. The blind rivet according to claim 2, wherein the effective diameter of the groove is set to be at least twice the thickness of the member to be joined. 8. The blind rivet according to claim 1, wherein a head of the rivet body is formed in an inverted truncated cone shape. 9. The blind rivet according to claim 1, wherein a rotating means is formed on an end surface of the head of the rivet body on the side opposite to the cylindrical portion.