Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Simultaneous severing and shaping – or severing while work...
Reexamination Certificate
2001-01-30
2003-09-09
Staicovici, Stefan (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Simultaneous severing and shaping, or severing while work...
C264S248000, C156S304200, C156S304600, C156S245000, C425S294000, C425S311000, C425S314000, C425S510000, C425S516000
Reexamination Certificate
active
06616878
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for bonding extrusion-molded or die-molded pieces such as automotive weather strips, and an apparatus for bonding such molded pieces.
RELATED ART OF THE INVENTION
As a method in which two extrusion-molded pieces, such as automotive weather strips, having hollow portions with the same sectional shape, are bonded with each other while end portions of the molded pieces facing with each other are made to abut against each other, there is known a method as follows. That is, as disclosed in JP-A-7-314560, a thin bonding raw material the sectional shape of which substantially coincides with the shape of the end surface of each of a pair of extrusion-molded weather strips is pasted onto the end surface of one of the weather strips to be bonded with each other. Then, the end surface of the one weather strip is made to abut against the end surface of the other weather strip through the bonding raw material. And then, the two weather strips are set in a mold and both the end portions thereof to be bonded are vulcanized and bonded with each other.
It had been required to insert an inner core between hollow portions of two weather strips to be bonded to prevent a molding material from being injected into the hollow portions. According to the aforementioned method, however, such an inner core becomes unnecessary.
According to the bonding method disclosed in JP-A-7-314560, however, there is a problem that the work of bonding is troublesome because the shape of the thin bonding raw material is formed to substantially coincide with the shapes of the end surfaces of the weather strips to be bonded with each other.
Therefore, to take measures to solve this problem, the following bonding method can be considered. That is, in the method, a sheet material
1
as a bonding medium is interposed between hollow extrusion-molded pieces
2
and
3
, and the sheet material
1
is cut along the shapes of the end surfaces of the extrusion-molded pieces
2
and
3
to be bonded by a cutting blade
7
and a blade bearing portion
8
formed in upper and lower molds
5
and
6
so that a surplus of the sheet material
1
is removed, as shown in
FIGS. 22 and 23
.
In more detail, each of the upper and lower molds
5
and
6
is designed so as to split to left and right molds. That is, the upper mold
5
is constituted by split molds
5
A and
5
B, while the lower mold
6
is constituted by split molds
6
A and
6
B. First, an abutment plate (not shown) is put as a partition between the left and right split molds
6
A and
6
B, and the extrusion-molded pieces
2
and
3
precisely cut in a direction perpendicular to their longitudinal axes are set on the lower molds
6
A and
6
B so that the end surfaces of the molded pieces
2
and
3
to be bonded are brought into contact with the abutment plate from left and right sides, respectively. Here, the extrusion-molded piece
2
is set on the lower mold
6
A and the extrusion-molded piece
3
is set on the lower mold
6
B in the same manner. The distance between the extrusion-molded pieces
2
and
3
is defined by the abutment plate.
Next, the upper molds
5
(
5
A and
5
B) are moved down and the molds are closed so as to clamp the extrusion-molded pieces
2
and
3
from their top and bottom. Thus, the extrusion-molded pieces
2
and
3
are held firmly. Then, the upper and lower molds
5
A and
6
A holding the extrusion-molded piece
2
and the upper and lower molds
5
B and
6
B holding the extrusion-molded piece
3
are moved to left and right so as to leave each other, respectively. Subsequently, in place of the abutment plate, the sheet material
1
is inserted between the end surfaces
2
a
and
3
a
of the extrusion-molded pieces
2
and
3
to be bonded, respectively (see FIG.
22
).
Next, the upper and lower molds
5
A and
6
A and the upper and lower molds
5
B and
6
B apart from each other are made close to each other, respectively, and the end surfaces
2
a
and
3
a
of the extrusion-molded pieces
2
and
3
to be bonded are made to abut against each other through the sheet material
1
. As a result, the sheet material
1
is cut into a shape (in
FIG. 23
, a circular shape) corresponding to the shapes of the end surfaces of the extrusion-molded pieces
2
and
3
to be bonded by the cutting blade
7
and the blade bearing portion
8
formed in the upper and lower molds
5
and
6
. Then, the sheet material
1
and the extrusion-molded pieces
2
and
3
are heat-vulcanized so as to be bonded with one another (see FIG.
23
).
Upon completion of bonding, the upper and lower molds
5
A and
6
A and the upper and lower molds
5
B and
6
B are made to leave each other. Further, the upper molds
5
A and
5
B are made to come off from the lower molds
6
A and
6
B respectively, and the sheet material
1
and the extrusion-molded pieces
2
and
3
molded integrally are taken out from the molds, thus removing tailings of the cut sheet material
1
.
Thus, the bonding of the extrusion-molded pieces
2
and
3
is completed.
However, the above-described method of cutting the sheet material
1
with the cutting blade
7
and the blade bearing portion
8
formed in the upper and lower molds
5
and
6
, the portion to be cut cannot be cut perfectly so that a burr
9
is produced in the outer circumference of the sheet material
1
cut along the shapes of the end surfaces of the extrusion-molded pieces
2
and
3
to be bonded, as shown in FIG.
24
. When such a burr
9
is formed, there is a problem that a water-stop seal function is blocked when the extrusion-molded pieces
2
and
3
integrated with each other are used as seal material such as an automotive weather strip or the like.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a method and an apparatus for bonding two extrusion-molded pieces, two die-molded pieces, or one extrusion-molded pieces and one die-molded piece, in which no burr is produced in any portion where the molded pieces are bonded with each other, and which facilitate the bonding work.
Other objects and effects of the present invention will become apparent from the following description.
The above-described objects of the present invention have been achieved by providing the following methods and apparatus.
(1) A method for bonding molded pieces, comprising the steps of:
providing a mold which can be split into left and right molds, said right mold having a cutting blade formed on a left side thereof so as to be along outer circumferential surfaces of the molded pieces, and said left mold having a blade bearing portion formed on a right side thereof for bearing said cutting blade;
setting a pair of molded pieces having sectional shapes coincident with each other into said left and right molds, respectively, in such a manner that end surfaces of said molded pieces to be bonded are put inside so as to face each other, wherein said pair of molded pieces each individually being an extrusion-molded piece or a die-molded piece;
attaching said left and right split molds with each other while inserting a sheet material acting as a bonding medium therebetween, so that said end portions of said molded pieces to be bonded are brought into contact with each other via said sheet material, and that said sheet material is cut into a shape along the shape of said molded piece end surfaces by said cutting blade;
applying heat to at least a portion of said molded pieces to integrate with each other; and
sliding at least one of said molds and said integrated molded article to move left or right.
(2) The method for bonding molded pieces according to item (1) above, wherein said mold, which can be split into left and right molds, can be further split into two or more molds in the vertical direction, and said sliding step is carried out by sliding at least each one of said vertically split molds of said left and right molds.
3. A method for bonding molded pieces, comprising the steps of:
providing a mold which can be split into left and right molds, said ri
Harada Fumio
Konishi Kazuharu
Masada Yoshihiro
Nakaike Toshio
Nishikawa Rubber Co. Ltd.
Staicovici Stefan
Sughrue & Mion, PLLC
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