JP2000170728A - Removing method for expansion type rivet from pipe unit and expansion type rivet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate a board unit and a pipe unit easily without using an electric drill and to remove an insert pin remained in the pipe unit easily after the board unit and the pipe unit are separated. SOLUTION: The removing method consists of the following processes. An upper insert pin pushing-in process A to place an insert 17 on an upper insert pin 3B of an expansion type rivet 1A and to hit with a hammer 16, a lower insert pin pushing-out process B to hit the upper insert pine 3B with the hammer 16 and to drop a lower insert pin 3A from a hollow rivet unit 2A in a pipe 11A, an upper insert pin pushing-out process C to hit the upper insert pin 3B further continuously to drop it in the pipe unit 11A, a hollow rivet separation process D to pull out the hollow rivet unit 2A from the insert hole 11a of the pipe unit 11A and the penetration hole 10a in the board unit 10A, and an insert pin taking-out process E to drop the lower insert pin 3A and the upper insert pin 3B remained in the pipe unit 11A, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for removing an expandable rivet from a pipe body and an expandable rivet.

[0002]

2. Description of the Related Art FIG. 13 shows an example of an extended rivet in which the tip of a hollow rivet body is swaged while pushing a pin. The extended rivet 1 includes a hollow rivet body 2 and
A relatively long pin 3 inserted while being pushed into the hollow rivet body. The hollow rivet body 2
Comprises a flange-shaped head 4 and a hollow shaft 5 connected to the lower surface of the head 4, and a plurality of slits 6 are formed in the lower end of the hollow shaft 5 in the vertical direction. Hollow rivet body 2
The space 7 extends from the center of the head 4 to a tip 9 having a tapered surface 8 on the inner surface.

In the extended rivet 1 having the above structure,
The plate body 10 and the pipe body 11 are connected. First, the plate 10
And the insertion hole of the pipe body 11 are positioned.
Next, the hollow rivet main body 2 is inserted into the through hole and the insertion hole. Next, the pin 3 is inserted while being pushed into the space 7 of the hollow rivet body 2. Then, the insertion tip of the pin 3 expands the tip 9 of the hollow rivet body 2, and as a result,
The plate 10 is fixed to the pipe 11 via the expandable rivet 1.

By the way, conventionally, when the plate body 10 and the pipe body 11 thus joined are separated from each other, an electric drill 12 and a driver 13 are used as shown in FIG. That is, the tip of the electric drill 12 is brought into contact with the flanged head 4 of the hollow rivet main body 2, while the driver 13 is driven by the hollow rivet main body 2 so that the hollow rivet main body 2 does not rotate cooperatively due to the rotational frictional force of the pin 3. The pin 3 is cut from the upper end of the pin 3 against the outer peripheral wall.

However, in the above-mentioned method of removing the expandable rivet 1, the caulking portion connecting the plate body 10 and the pipe body 11 is broken, and the tip 9 of the hollow rivet main body 2 is There is a disadvantage that it remains in the pipe body 11 together with the lower end. Therefore, when the pipe body 11 is reused, the remaining portion 14 rolls inside the pipe body 11,
For example, it is not possible to solve the problem of “sounding”.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention has a main object to easily separate a plate and a pipe without using an electric drill. . Further, an insertion pin remaining in the pipe body after separating the plate body and the pipe body can be easily removed. Furthermore, a secondary purpose is that the upper insertion pin cannot be easily removed by mischief of a child or the like.

[0007]

SUMMARY OF THE INVENTION A method for removing an expandable rivet from a pipe body according to the present invention is as follows.
An upper insertion pin pushing step A in which a driver-like insertion tool 17 is applied to the upper insertion pin 3B of the expandable rivet 1A connecting the extension rivet 1A and is hit with a hammer 16;
Hit the upper insertion pin 3B via the insertion tool 17 with
A lower insertion pin pushing step B for dropping the lower insertion pin 3A pressed by the upper insertion pin 3B from the hollow rivet main body 2A into the pipe body 11A; and an upper insertion pin 3B located in the distal end portion 9A of the hollow rivet main body 2A. Hammer 16
And continue to hit through the plug 17 with the pipe body 11
A, an upper insertion pin pushing step C for dropping into the inside A, a hollow rivet body separation step D for pulling out the hollow rivet body 2A from the insertion hole 11a of the pipe body 11A and the through hole 10a of the plate body 10A, and an insertion hole of the pipe body 11A. An insertion pin removing step E is performed in which the lower insertion pin 3A and the upper insertion pin 3B remaining in the pipe body 11A are dropped from the pipe body 11A with the 11a facing downward.

[0008] Further, according to the expandable rivet of the present invention, an insertion pin is inserted into a hollow rivet body composed of a flange-shaped head and a hollow shaft connected to the lower surface of the head, and a tip end having a slit is expanded. In an expandable rivet for connecting a plate body and a pipe body, the insertion pin is provided with a hollow rivet body 2A.
And fall into the pipe body, respectively, and
The lower rivet body 2A is characterized by comprising a lower insertion pin 3A that expands and expands the distal end portion, and an upper insertion pin 3B that is linearly located on the lower insertion pin 3A.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a case where the present invention is applied to a chair will be described. 1 to 7 are explanatory diagrams of the method invention. 8 to 12 are explanatory diagrams of the invention of the product. FIG. 1 is an overall process diagram showing a method of removing an expandable rivet. FIG. 2 is a perspective view showing an example of furniture using an extended rivet.

First, an expandable rivet 1A according to the present invention will be described with reference to FIGS. The configuration of the expandable rivet 1A is substantially the same as that of the conventional expandable rivet 1 shown in FIG. 13, and therefore, for convenience of description, the same portions are denoted by the same reference numerals.

Reference numeral 1A denotes an expandable rivet for integrally connecting a pipe body 11A such as a chair and a plate body 10A such as a seat plate as shown in FIG. The expandable rivet 1A includes a hollow rivet main body 2A and two insertion pins 3A and 3B that are inserted while being pushed into the hollow rivet main body.
The two insertion pins 3A and 3B are located on a straight line.

Thus, the hollow rivet body 2A is
It comprises a flange-shaped head 4A and a hollow shaft 5A connected to the lower surface of the head 4A, and a plurality of slits 6A are formed in the lower end of the hollow shaft 5A in the vertical direction. The space 7A of the hollow rivet body 2A extends from the center of the head 4A to a tip 9A having a tapered surface 8A.

On the other hand, in the insertion pins 3A and 3B, the lower insertion pin 3A (first pin) is slightly longer than the upper insertion pin 3B (second pin). Of course, both insertion pins 3A and 3B may have the same length. However, the length of the insertion pin 3A is shorter than the inner diameter of the pipe body 11A. Further, on the outer peripheral wall of the insertion pin 3B located above, a slip-out preventing portion (knurled shape) 15 is formed.

In the expandable rivet 1A having the above structure, the plate body 10A and the pipe body 11A are connected as shown in FIGS. First, the through hole 10a of the plate body 10A
And the insertion hole 11a of the pipe body 11A.
Next, the hollow rivet main body 2A is inserted into the through hole 10a and the insertion hole 1
1a. Next, after completely inserting the lower insertion pin 3A into the hollow shaft 5A, the upper insertion pin 3B is inserted into the head 4A. Next, the upper insertion pin 3B is hit with a hammer (hammer) 16. Then, as shown in FIG.
The lower insertion pin 3A is pushed by the upper insertion pin 3B, and expands the distal end 9A of the hollow rivet main body 2A. As a result, the plate body 10A is connected to the pipe body 11A via the expandable rivet 1A.

Next, a method of removing the above-mentioned expandable rivet 1A from the pipe body 11A will be described with reference to FIGS.

FIG. 3 shows an upper insert in which a driver-like insert (a nail, a punch or the like) 17 is applied to the upper insert pin 3B of the expandable rivet 1A connecting the plate body 10A and the pipe body 11A and the hammer 16 is used. The pin pushing step A is shown.
In the upper insertion pin pushing step A, an electric screwdriver is not used at all as in the related art. When hitting the upper end surface of the grip 17a of the insertion device 17 with the hammer 16, for example, the grip 17a is firmly gripped with the left hand, and
Should not be displaced from the upper end surface of the upper insertion pin 31B.

FIG. 4 shows that the upper insertion pin 3B is hit with the hammer 16 through the insertion tool 17, and the upper insertion pin 3B is
Lower insertion pin pushing step B in which the lower insertion pin 3A pushed by the rivet is dropped from the hollow rivet main body 2A into the pipe body 11A.
It is.

FIG. 5 shows that after the lower insertion pin pushing step B, the upper insertion pin 3B located in the distal end portion 9A of the hollow rivet body 2A is further struck by the hammer 16 via the insertion tool 17, and the pipe body is continued. This is an upper insertion pin pushing step C for dropping into the inside 11A. As a result, the upper insertion pin 3B also remains in the pipe body 11A similarly to the lower insertion pin 3A.

FIG. 6 shows a hollow rivet body separating step D in which the hollow rivet body 2A is manually pulled out from the insertion hole 11a of the pipe body 11A and the through hole 10a of the plate body 10A. In this hollow rivet main body separation step D, the hollow rivet 2A that is manually pulled out is pulled out of furniture, but from the viewpoint of reuse, preferably, the pipe 11A and the plate 10A are not scratched. Should.

FIG. 7 shows a state in which the insertion hole 11a of the pipe body 11A is directed downward, and the lower insertion pin 3 remaining in the pipe body 11A.
This is an insertion pin removal step E for dropping the upper insertion pin 3B from the pipe body 11A. In the insertion pin removing step E, the pipe body 11A is held in a hand, and if necessary, the insertion pin is removed using a screwdriver or tweezers.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An escape prevention portion (knurled shape) 15 is formed on an outer peripheral wall of an upper insertion pin 3B of an extended rivet 1A. However, the present invention is not limited to this. It may be a plurality of notches or the like in which the pins are displaced outward. It is desirable that the escape preventing portion (knurled shape) 15 is formed to have a somewhat larger diameter in consideration of the point that the upper insertion pin 3B is pressed into the expanded rivet 1A. As an example of the plate material 10A, a synthetic plate is used. On the other hand, as an example of the pipe body 11A, a steel pipe (diameter 22.2 mm, thickness 1 mm) is used.
The lower and upper insertion pins 31A and 3B are made of metal or hard synthetic resin. Also, the insertion pin 3A,
3B is a length that falls from the hollow rivet main body 2A into the pipe body 11A.

[0022]

As is apparent from the above description, the present invention has the following effects. (1) The plate body and the pipe body can be easily separated from each other without using an electric drill. (2) The insertion pin remaining in the pipe body after separating the plate body and the pipe body can be easily removed. (3) According to the third aspect of the invention, the upper insertion pin does not easily come off due to mischief of a child or the like.

[Brief description of the drawings]

1 to 7 are explanatory views showing an example of the invention of the method of the present invention. 8 to 12 are explanatory views showing an example of the invention according to the present invention. FIG. 13 and FIG. 14 are explanatory views showing an example of the related art.

FIG. 1 is an overall process diagram.

FIG. 2 is a perspective view illustrating an example of furniture.

FIG. 3 is an explanatory view of an upper insertion pin pushing step.

FIG. 4 is an explanatory view of a lower insertion pin pushing step.

FIG. 5 is an explanatory view of an upper insertion pin pushing step.

FIG. 6 is an explanatory view of a hollow rivet main body separating step.

FIG. 7 is an explanatory view of an insertion pin removing step.

FIG. 8 is a perspective view of an expandable rivet of the present invention.

FIG. 9 is a front view of the expandable rivet.

FIG. 10 is an exploded perspective view of an expandable rivet.

FIG. 11 is an explanatory view showing a state in which an expandable rivet is attached.

FIG. 12 is an explanatory view of a state in which an expandable rivet is swaged.

FIG. 13 is a schematic explanatory view of a conventional expandable rivet.

FIG. 14 is an explanatory view when removing a conventional expandable rivet.

[Explanation of symbols]

A: upper inserting pin pushing step, B: lower inserting pin pushing step, C: upper inserting pin pushing step, D: hollow rivet body separating step, E: inserting pin removing step, 1A: expandable rivet, 2A: hollow rivet body 3A: lower insertion pin, 3B: upper insertion pin, 4A: head, 4A: hollow part,
6A: slit, 7A: space, 8A: tapered surface, 9A
... Tip end, 10A ... plate body, 11A ... pipe body, 15 ... escape prevention part, 16 ... hammer, 17 ... insertion tool.

Claims (3)

[Claims] 1. An upper insertion pin pushing step A in which a driver-like insertion tool 17 is applied to an upper insertion pin 3B of an expandable rivet 1A connecting a plate body 10A and a pipe body 11A and is hit with a hammer 16; Plug-in tool 17
The upper insertion pin 3B is slammed through the lower rivet body 2 so that the lower insertion pin 3A pushed by the upper insertion pin 3B is
A, a lower insertion pin pushing step B for dropping into the pipe body 11A from A, and an upper insertion pin 3B located in the distal end portion 9A of the hollow rivet main body 2A using a hammer 16 to insert the insertion tool 17 with the hammer 16.
And an upper insertion pin pushing step C for dropping into the pipe body 11A and the hollow rivet body 2A
Is separated from the insertion hole 11a of the pipe body 11A and the through hole 10a of the plate body 10A, and the insertion hole 11a of the pipe body 11A is directed downward.
Lower insertion pin 3A and upper insertion pin 3B remaining in 1A
For removing an expandable rivet from a pipe body, comprising an insertion pin removing step E for dropping the pipes from the pipe body 11A, respectively. 2. An insertion pin is inserted into a hollow rivet body comprising a flange-shaped head and a hollow shaft connected to the lower surface of the head, and a tip end having a slit is expanded to form a plate body and a pipe body. And a lower insertion pin 3A that is long enough to fall from the hollow rivet body 2A into the pipe body, and that expands the tip of the hollow rivet body 2A. This lower insertion pin 3
A. An extended rivet comprising an upper insertion pin 3B located on a straight line at A. 3. The expandable rivet according to claim 2, wherein a detachment preventing portion 15 is formed on an outer peripheral wall of the upper insertion pin 3B.