Metal working – Method of mechanical manufacture – Disassembling
Reexamination Certificate
1999-08-30
2001-12-18
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Disassembling
C029S700000, C029SDIG006, C083S745000, C083S466100, C083S682000
Reexamination Certificate
active
06330738
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is related and claims priority, under 35 U.S.C. § 119, to Japanese Patent Application No. 10-259410, filed on Aug. 28, 1998, Japanese Patent Application No. 10-298733, filed on Oct. 20, 1998, Japanese Patent Application No. 10-277073, filed on Sep. 30, 1998, Japanese Patent Application No. 10-260942, filed on Aug. 31, 1998, Japanese Patent Application No. 10-230250, filed on Aug. 17, 1999, and Japanese Patent Application No. 10-282249, filed on Oct. 5, 1998, the entire contents of which six Japanese Patent Applications are hereby incorporated by reference herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to: a dismounting method for a fastening member in which a fastening member is dismounted from a base material, wherein the fastening member includes a head and a body, the body is inserted into a fastening hole formed in the base material, and the head contacts a peripheral edge of the fastening hole when in a fastened state with the body; a dismounting device for a fastening member; an attachment construction of a fastening member; and a production system using the dismounting method for a fastening member.
2. Discussion of Background
Presently known techniques for uniting any one of a steel plate, plastic base materials to each other, or a member to a base material, include welding, bonding, mechanical fastening, etc.
Welding techniques are desirable for joining materials requiring a great uniting strength, but have the drawback that large-scaled, expensive equipment is usually necessary to accomplish the joining and thus, a large amount of space is required in order to perform the joining safely.
Bonding techniques can be carried out inexpensively and in a small space, as compared with the above-mentioned welding techniques, but have the drawback that the attitude of a base material has to be constantly maintained until the bonding agent is set and thus, a lot of time is required to accomplish the uniting.
Further, in both welding and bonding techniques, when the base materials are united and either, inferior uniting occurs so as to require re-uniting, or a base material is desired to be recycled and reused, it is very difficult to dismount the base materials from each other at the united portion without damaging the base materials.
On the other hand, presently know mechanical fastening techniques include screw fastening, pin fastening, and rivet fastening.
Presently known screw fastening techniques include, for example, the following two methods. In a first method, as illustrated in FIG.
92
(
a
), a bolt
3
is the fastening member and is inserted into fastening holes
1
a
and
2
a
of base materials
1
and
2
, respectively, and then a nut
4
is screwed onto the end of the bolt
3
using a spanner to thereby mechanically unite the base materials
1
and
2
to each other. In a second method, as illustrated in FIG.
92
(
b
), a tapping screw
5
is the fastening member and is threadingly engaged with thread portions formed on the inner surface of fastening holes
1
a
and
2
a
in the base materials
1
and
2
, respectively, via a screw driver to mechanically unite the base materials
1
and
2
to each other.
Presently known pin fastening techniques include, for example, the following two methods. In a first method, as illustrated in FIG.
93
(
a
), a pin
6
is the fastening member and is inserted into fastening holes
1
a
and
2
a
of the base materials
1
and
2
, respectively, and opposite ends of the pin
6
are caulked, using a caulking machine or a caulking tool, to thereby mechanically unite base materials
1
and
2
to each other. In a second method, as illustrated in FIG.
93
(
b
), a shaft
7
is the fastening member and is inserted into a fastening hole of base material
1
and then, an end of the shaft
7
is caulked, using a caulking machine or a caulking tool, to thereby mechanically unite the base material
1
and the shaft
7
to each other.
Presently known rivet fastening techniques include, for example, the following two methods. In a first method, the fastening member is either a solid rivet
8
, as illustrated in FIG.
94
(
a
), or a tubular rivet
9
, as illustrated in FIG.
94
(
b
). Then, either the solid rivet
8
or the tubular rivet
9
is inserted into the fastening holes
1
a
and
2
a
of base materials
1
and
2
, respectively, and then, the ends of either the solid rivet
8
or the tubular rivet
9
are crushed, as illustrated in FIG.
94
(
d
) and FIG.
94
(
e
), respectively, to thereby mechanically unite the base materials
1
and
2
to each other. In a second method, the fastening member is a blind rivet
10
, as illustrated in FIG.
94
(
c
), which is inserted into fastening holes
1
a
and
2
a
of base materials
1
and
2
, respectively, and then, the end of the blind rivet
10
is crushed using a core shaft, which will be described below, to thereby mechanically unite the base materials
1
and
2
to each other, as shown in FIG.
94
(
f
).
The blind rivet
10
, as shown in FIG.
94
(
c
), includes a rivet body
11
and a mandrel (core shaft)
12
, wherein the mandrel
12
is inserted into an shaft hole
11
a
of the rivet body
11
. For example, base materials
1
and
2
are mechanically fastened to each other in the following procedure.
In this rivet fastening technique, first, a body
11
b
of the blind rivet
11
is inserted into fastening holes
1
a
and
2
a
of the base materials
1
and
2
, respectively, as shown in FIG.
95
(
a
), and a blind rivet fastening device
13
is placed at an end of the mandrel
12
, as shown in FIG.
95
(
b
).
Then, as shown in FIG.
95
(
c
), a nose piece
13
a
of the blind rivet fastening device
13
is brought into close contact with a head
11
c
of the rivet body
11
, and the blind rivet fastening tool
13
is actuated, while the head
11
c
is pressed against the base material
1
via the nose piece
13
a.
Thereby, the mandrel
12
is gripped by a jaw member
13
b
(i.e., a fastening shaft gripping portion of the blind rivet fastening device
13
) and pulled in the direction opposite of the pressing direction. A portion of the rivet body
11
b
, which extends outwardly past the bottom of the base material
2
, is plastically deformed and crushed, thus being caulked and pressed against the base material
2
.
When in this condition, the jaw member
13
b
is further pulled in the direction opposite of the pressing direction, the mandrel
12
is ruptured at a diameter-reduced portion
12
b
, as shown in FIG.
95
(
d
), and the base materials
1
and
2
are fastened to each other via the blind rivet
10
.
The blind rivet
10
, of FIGS.
95
(
a
)-(
d
), is fastened by the pulling of the mandrel
12
in the direction opposite the pressing direction so that the base materials
1
and
2
are united without having to support the back sides thereof. This rivet fastening method is suitable for uniting base materials
1
and
2
so that a person's hands are not required to be placed near the back sides of the base materials
1
and
2
in order to unite them.
Note that a conventional mechanical fastening technique known as “burring caulking” is shown in
FIG. 96
, wherein a shaft
7
(i.e., a rivet body
11
b
) is formed integrally with one base material
1
and is caulked to a fastening hole
2
a
of the other base material
2
to mechanically unite the base materials
1
and
2
.
The above-described mechanical fastening techniques are desirable because: (1) a large apparatus is not required, as compared with the above-described conventional welding techniques; (2) the fastening can be accomplished easily and safely, even in a narrow space; and (3) the base materials
1
and
2
can be united in a short amount of time, as compared with the above-described bonding techniques.
However, the bodies of the fastening members, such as the pins, rivets, burring caulking, etc., used in mechanical fastening techniques, are plastically deformed and fastened to the base material. This may lea
Jibiki Yuichi
Yasuda Mitsuru
Yoshikawa Ryosuke
Hong John C.
Hughes S. Thomas
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
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