Cutlery – Cutting tools – Plural cooperating blades
Reexamination Certificate
1999-11-29
2002-08-06
Bryant, David P. (Department: 3726)
Cutlery
Cutting tools
Plural cooperating blades
C029S426400, C029S261000, C030S228000
Reexamination Certificate
active
06427336
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a clamping member disassembling device and method for disassembling a clamping member from base metals, the clamping member comprising a head portion and a body portion being inserted into clamping holes formed in the base metals, the head portion being in contact with a peripheral edge portion of one of the clamping holes, the clamping member thus clamping the base metals, as well as an attachment structure thereof and a production system using the disassembling method.
2. Description of the Related Art
As techniques for joining base metals such as steel plates or plastic plates or for connecting another member to such a base metal there are known such techniques as welding, bonding, and mechanical clamping.
The welding technique is advantageous in that the bonding strength is high, but is disadvantageous in that a large-scaled and expensive equipment is required and that a large space is needed for ensuring safety.
The bonding technique, in comparison with the welding technique, is advantageous in that the cost is low and that the bonding work can be done in a small space, but is disadvantageous in that it is necessary to keep the posture of base metals constant until an adhesive used solidifies, thus requiring a long time for bonding.
In the case of welding or bonding, when bonded base metals are not bonded to a satisfactory extent and are therefore to be re-bonded or when base metals are to be recycled, it is very difficult to disassemble the base metals from the bonded portion without any damage to the base metals.
On the other hand, as to mechanical clamping, various clamping techniques are known. Screw clamping, pin clamping and rivet clamping are mentioned as typical mechanical clamping techniques.
As to screw clamping there are known, for example, such a method as shown in FIG.
18
(
a
) in which a bolt
3
as a clamping member inserted into clamping holes
1
a
and
2
a
formed in base metals
1
and
2
and a nut
4
as a clamping member engaged threadedly with the bolt
3
are tightened using a spanner to join the base metals
1
and
2
mechanically and such a method as shown in FIG.
18
(
b
) in which, with use of a screw-driver, a tapping screw
5
as a clamping member is brought into threaded engagement with threads formed in clamping holes
1
a
and
2
a
of base metals
1
and
2
, to clamp the base metals, thereby joining the base metals mechanically.
As to pin clamping there are known, for example, such a method as shown in FIG.
19
(
a
) in which a pin
6
as a clamping member is inserted into clamping holes
1
a
and
2
a
and is then caulked at both ends thereof by means of a caulking machine or a caulking tool to join base metals
1
and
2
mechanically and such a method as shown in FIG.
19
(
b
) in which a shaft
7
as a clamping member is inserted into a clamping hole of a base metal
1
and is then caulked at an end portion thereof by means of a caulking machine or a caulking tool to connect the shaft
7
to the base metal
1
mechanically.
As to rivet clamping there are known a method in which a solid rivet
8
as a clamping member shown in FIG.
20
(
a
) and a tubular rivet
9
as a clamping member shown in FIG.
20
(
b
) are each inserted into clamping holes
1
a
and
2
a
of base metals
1
and
2
and are then squeezed at respective end portions to connect the base metals with each other mechanically and a method in which a blind rivet
10
as a clamping member shown in FIG.
20
(
c
) is inserted into clamping holes
1
a
and
2
a
of base metals
1
and
2
and is then squeezed at an end portion thereof using a mandrel which will be described later to connect the base metals
1
and
2
with each other mechanically, as shown in FIG.
20
(
f
).
The blind rivet
10
, as shown in FIG.
20
(
c
), comprises a rivet body
11
and a mandrel
12
inserted into an axial hole
11
a
of the rivet body
11
. For example, base metals
1
and
2
are clamped together mechanically in accordance with the following procedure.
According to this rivet clamping method, first a body portion
11
b
of the blind rivet
11
is inserted into clamping holes
1
a
and
2
a
of base metals
1
and
2
, as shown in FIG.
21
(
a
), and a blind rivet clamping device
13
is set at an end portion of the mandrel
12
, as shown in FIG.
21
(
b
).
Then, as shown in FIG.
21
(
c
), a nose piece
13
a
of the blind rivet clamping device
13
is brought into close contact with a head portion
11
c
of the rivet body
11
and the blind rivet clamping device
13
is triggered while the head portion
11
c
is pushed against the base metal
1
by the nose piece
13
a.
As a result, the mandrel
12
is gripped by a jaw member
13
b
as a clamp shaft gripping member of the blind rivet clamping device
13
and is pulled in the direction opposite to the pushing direction, then the portion of the body portion
11
b
projecting from the back side of the base metal
2
is deformed plastically and squeezed and is caulked into pressure contact with the base metal
2
.
In this state, if the jaw member
13
b
is further pulled in the direction opposite to the pushing direction, the mandrel
12
will be broken at a reduced-diameter portion
12
b
thereof, so that the base metals
1
and
2
are clamped together by the blind rivet
10
, as shown in FIG.
21
(
d
).
In this clamping work using the blind rivet
10
, the mandrel is thus pulled in the direction opposite to the pushing direction and therefore, as shown in FIGS.
21
(
a
) to
21
(
d
), the clamping work for the base metals
1
and
2
can be carried out without supporting the back side of the base metals. Thus, this method is suitable for clamping the base metals
1
and
2
in such a place where the worker's hand cannot reach the back side of the base metals.
There also is known a mechanical clamping technique called burring caulking in which, as shown in
FIG. 22
, a shaft
7
(body portion
11
b
) integral with one base metal
1
is caulked to a clamping hole
2
a
of the other base metal
2
to clamp both base metals together mechanically.
Such a mechanical clamping technique is advantageous in that, as compared with the welding technique, the clamping work can be done easily while ensuring safety and even in a narrow space without requiring a large-sized equipment. Further, it is advantageous in that the base metals
1
and
2
can be clamped together rapidly in comparison with the bonding technique.
However, the clamping member used in such mechanical clampings as pin clamping, rivet clamping and burring caulking is clamped to base metals by a plastic deformation of its body portion, so when the clamping member is not properly clamped to base metals and so must be removed from the base metals or when base metals are to be recycled and therefore must be removed from the clamping member, it is necessary to disassemble the clamping member. However, this disassembling work requires much time and labor and there is a fear that the base metals may be damaged in the disassembling work. More particularly, as a disassembling method for this type of a clamping member there is known such a method as shown in FIG.
23
. An example thereof will be described below with respect to disassembly of the blind rivet
10
as a clamping member.
First, with a drill
14
, the head portion
11
c
of the blind rivet
10
is cut and removed from the body portion
11
b.
Then, by tapping the cut portion in a direction in which the body portion
11
b
comes out of the clamping holes
1
a
and
2
a,
the blind rivet
10
is pulled out from the base metals
1
and
2
.
Such a conventional blind rivet disassembling method requires much time and labor for preparatory works, including selection of the drill
14
and the cutting work. Moreover, in cutting the head portion
11
c,
if the tip of the drill
14
reaches the base metal
1
and cuts the clamping hole
1
a
of the base metal
1
, with consequent increase in size of the clamping hole
1
a,
as shown in
FIG. 24
,
Jibiki Yuichi
Kojima Takao
Blount Steven
Bryant David P.
Ricoh & Company, Ltd.
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