JP2557957Y2 - Self-piercing rivets - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-piercing rivet used for fastening a member such as a thin metal plate to another thick member.

[0002]

2. Description of the Related Art A rivet 10 as shown in FIGS. 9 and 10 is used to fix a thin metal plate to a thick member, for example, when fixing a floor plate to a beam in a steel building. ing. That is, this conventional rivet includes an outer cylinder 11 having a flange 11a at one end, and an outer cylinder 11 having a flange 11a.
And an inner cylindrical body 12 fitted from one end of the outer cylindrical body 11. The inner peripheral surface of the outer cylindrical body 11 and the outer peripheral surface of the inner cylindrical body 12 are tapered in such a manner that the diameter decreases toward the other end of the outer cylindrical body 11. In the fastening member A and the member to be fastened B, a ring-shaped pilot hole 14 in a plan view in which the outer cylinder 11 and the inner cylinder 12 are fitted with a special drill 13 formed in a cylindrical shape. After drilling, the outer cylinder 11 and the inner cylinder 12 are inserted into the prepared hole 14 in a fitted state, and the inner cylinder 12 is driven into the prepared hole 14 with a hammer. The body 11 is expanded radially outward so as to hold the outer cylinder 11 immovably.

[0003] The drill 13 is provided with a center pin 15 having a sharpened tip so as to be slidable. The center pin 15 is urged toward the tip by a spring (not shown). By aligning the center pin 15 with the formed punch hole C and retracting the center pin 15 against the spring,
The position of the drill 13 is adjusted.

[0004]

However, the conventional rivet 10 is previously prepared by a special drill 13 in advance.
After piercing, the rivet 10 is fitted into the pilot hole 14, and in addition to the drilling operation of the pilot hole 14, the operation of inserting the rivet 10 into the pilot hole 14 is required, so that the efficiency of the fastening operation is low. However, if the drill 13 is broken, the operation cannot be continued.

[0005] On the other hand, Japanese Patent Application Laid-Open No. 53-58104 discloses a method in which a drill portion is formed at the tip of a cylindrical body with a closed bottom and the body enters a fastening member by drilling of the drill portion. A self-piercing anchor that pushes a drill portion by driving a pin-shaped expanding body into the body has been described.
Since the drilled part is closed at the tip of the body, the amount of cutting by the drilled part is large and it takes time for drilling work. There is.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a self-piercing rivet capable of efficiently performing a fastening operation on a metal member such as a steel material.

[0007]

A self-piercing rivet according to the present invention comprises an outer cylinder having a flange at one end for engaging a rotary tool, and an inner cylinder which is fitted into the outer cylinder from one end thereof. And body. The inner peripheral surface of the outer cylindrical body and the outer peripheral surface of the inner cylindrical body are formed by pushing the inner cylindrical body from one end direction of the outer cylindrical body so that the outer cylindrical body is radially outwardly expanded. Forming a tapered shape whose diameter gradually decreases toward the end; A plurality of cutout grooves extending over the entire length of the outer cylinder body are formed at appropriate intervals along the circumferential direction to divide the outer cylinder body into a plurality of parts excluding the flange; Forming a drill portion at the end of each divided portion of the outer cylinder body, and forming each of these drill portions in a state of bulging radially inward; Setting the inner diameter of the inner cylinder to be substantially the same as the inner diameter of the drill portion; It is characterized in that the tip of the inner cylinder is formed to be sharp so that the drill portion of the outer cylinder is pushed radially outward by driving the inner cylinder.

[0008]

In this configuration, when the rotating tool is engaged with the flange of the outer cylinder and rotated while pressing the outer cylinder against the fastening member superimposed on the member to be fastened, the outer cylinder becomes By the drilling action of the formed drill portion, the outer cylinder and the inner cylinder enter the fastening member and the member to be fastened.

In this case, since the cutout groove extends over the entire length of the outer cylindrical body, cutting chips are smoothly removed, so that even if the fastening member and the member to be fastened are made of a hard metal such as steel, The outer cylinder and the inner cylinder can smoothly enter these members. Further, since the drill portion is cylindrical, the cutting amount of the member is remarkably small even if the outer diameter is the same, as compared with Japanese Patent Application Laid-Open No. 53-58104.

[0010] The small amount of cutting by the drill portion and the smooth escape of the cutting powder are combined, so that the drilling operation can be performed efficiently. Further, since the inner diameter of the cylindrical body is set to substantially the same size as the inner diameter of the drill portion, the drilling operation can be performed while the inner cylindrical body is still inserted into the outer cylindrical body, and the work efficiency is accordingly high.

When the flange of the outer cylinder comes into contact with the surface of the fastening member, the drilling is stopped, and when the inner cylinder is driven with a hammer, the inner surface of the outer cylinder and the outer surface of the inner cylinder are tapered. As a result, the radius of the outer cylindrical body is enlarged and strongly adheres to the member to be fastened, whereby the fastening member is fixed to the member to be fastened. In this case, since the outer cylindrical body is divided by the cutout groove, it is ensured that the outer cylindrical body can be pushed outward in a radially outward direction. In addition to this, the drill part is bulging radially inward and the tip of the inner cylinder is sharply formed, so the drill part is intensively expanded by the driving of the outer cylinder, The drill portion bites into the member to be fastened, thereby more reliably preventing the outer cylinder and the inner cylinder from coming off. In other words, the fastening strength can be significantly improved.

As described above, the self-piercing rivet of the present invention can efficiently and firmly fasten even if the fastening member and the member to be fastened are hard members such as steel.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 8).
It will be described based on. FIG. 1 is an exploded perspective view, and a rivet 1 according to the present invention includes an outer cylinder 2 and an inner cylinder 3 each formed of steel. A flange 2a having a hexagonal shape in a plan view is formed at one end of the outer cylindrical body 2 so as to engage with a socket 4 of a rotary tool (not shown). Further, a plurality of cutout grooves 5 extending over the entire length are formed in the outer cylinder body 2 at appropriate intervals along the circumferential direction. That is, each part divided by the cutout groove 5 is formed to be connected by the flange 2a.

A chip discharge groove 5a communicating with each cutout groove 5 is also formed on the flange 2a of the outer cylinder 2.
A drill portion 2b is formed at the other end of the outer cylinder 2. FIG.
3 is a cross-sectional view of the rivet 1, and FIG. 3 is a bottom view taken along the line III-III of FIG. 2. As shown in both figures, the outer peripheral surface of the outer cylinder 2 and the inner Is formed. On the other hand, by swelling the drill portion 2b of the outer cylindrical body 2 inward of the radius, the inner diameter d1 of the drill portion 2b is increased.
Is set to be the same as or slightly smaller than the inner diameter d2 of the inner cylinder 3. The inner peripheral surface of the outer cylinder 2 and the outer peripheral surface of the inner cylinder 3 are formed in a tapered shape whose diameter decreases toward the drill portion 2b.

The inner peripheral surface of the outer cylinder 2 and the outer peripheral surface of the inner cylinder 3 have a gentle angle θ1 in the range from one end to the drill portion 2b.
Incline. Also, a drill portion 2 of the outer cylinder 2
The inner surface at the base of b is inclined at a large angle θ2, and the tip of the inner cylindrical body 3 is sharply formed in a tapered shape inclined at a large angle so as to be in close contact with the inclined surface of the drill portion 2b.

As shown in FIG. 1, a center pin 6 for a positioning punch hole C is slidably mounted on the socket 4 of the rotary tool. FIG. 4 is a plan view of a used state in which the inner cylindrical body 3 is fitted into the outer cylindrical body 2, and FIG. 5 is a cross-sectional view taken along a line VV in FIG. 4, and the rivet 1 is used in this state. That is, as shown in FIG. 6, the socket 4 of the rotary tool is engaged with the flange 2a of the outer cylinder 2, and the drill portion 2b is rotated while pressing the drill portion 2b against the fastening member A and the member B to be fastened. While drilling a ring-shaped pilot hole D in the member A and the member B to be fastened, the outer cylinder 2 and the inner cylinder 2 are made to enter the fastening member A and the member B to be fastened. When the flange 2a comes into contact with the surface of the fastening member A, the rotation is stopped and the inner cylinder 3 is hammered into the prepared hole D as shown in FIG. Then, the entire outer cylinder body 2 is pushed outward in a radially outward direction, and the outer cylinder body 3 is held so as not to come off with respect to the member B to be fastened, whereby the fastening member A is fastened to the member B to be fastened ( Fixed).

In this step, since the cutout groove 5 extending over the entire length of the outer cylinder 2 is formed, the swarf can be removed smoothly and the outer cylinder 5 can be expanded by driving the inner cylinder 3. Be certain. Further, the outer cylinder 2
Since the drill portion 2b of FIG.
As shown in FIG.
b is in a state of being cut into the member to be fastened B, and fastening is ensured.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a bottom view taken along the line III-III of FIG. 2;

FIG. 4 is a plan view of a rivet.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a diagram showing a perforated state.

FIG. 7 is a diagram showing a fastening procedure.

FIG. 8 is an enlarged view of a main part in a fastened state.

FIG. 9 is a perspective view showing a conventional technique.

FIG. 10 is a cross-sectional view of a state where the conventional rivet is used for fastening.

[Explanation of symbols]

 Reference Signs List A fastening member B member to be fastened 1 rivet 2 outer cylinder 2a flange 2b drill part 3 inner cylinder 4 rotary tool socket 5 cutout groove

Claims (1)

(57) [Scope of request for utility model registration] 1. An outer cylindrical body 2 provided at one end with a flange 2a for engaging with a rotary tool, and the outer cylindrical body 2 is tightly fitted from one end thereof.
Consists DOO fitted interpolated among the cylindrical body 3 which, outside in the the outer cylindrical body 2 the inner peripheral surface and outer peripheral surface of the inner cylindrical body 3, the inner cylindrical body 3 from one end direction of the outer cylinder 2 implantation A cutout groove formed in a tapered shape whose diameter is gradually reduced toward the other end of the outer cylindrical body 2 so that the cylindrical body 2 can be pushed outward in a radially outward direction.
5 are formed in a plurality at appropriate intervals along the circumferential direction.
The portion of the outer cylinder 2 excluding the flange 2a is thereby duplicated.
Divide into several pieces, and attach them to the tip of each divided part of the outer cylinder 2.
Each of the drill portions 2b is formed.
Is formed so as to bulge inward in the radius, while the inner diameter d2 of the inner cylindrical body 3 is changed to the inner diameter d1 of the drill portion 2a.
, And the tip of the inner cylinder 3 is
When the inner cylinder 3 is driven, the drill portion 2b of the outer cylinder 2 is driven.
It must be sharp so that it can be pushed outward in a radius.
And a self-piercing rivet.