Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Forming plural articles
Reexamination Certificate
2000-12-20
2004-11-30
Tentoni, Leo B. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Forming plural articles
C264S328800, C264S297800, C425S588000
Reexamination Certificate
active
06824723
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a molding and tentatively retaining mold and a method of molding and tentative retention in which a plurality of kinds of independent parts of different shapes are molded in a plurality of cavities formed between a fixed mold and a plurality of movable molds, and at least one part after molding is relatively moved with respect to another part by the movable mold so as to set the parts in a tentatively retained state.
The present application is based on Japanese Patent Application No. Hei. 11-361668, which is incorporated herein by reference.
2. Description of the Related Art
Conventional molding and tentatively retaining molds for effecting the molding and tentative retention of a connector with rear holders are disclosed in JP-A-8-250183 and the like.
As shown in
FIG. 11
, a conventional molding and tentatively retaining mold
100
is comprised of an unillustrated fixed mold, a first movable mold
101
which is movable in vertical directions in the drawing, a pair of second movable molds
102
which are movable in left- and rightward directions in the drawing, and a pair of third movable molds
103
which are movable in a direction perpendicular to the second movable molds
102
. It should be noted that a connector
110
with rear holders is comprised of a housing
111
having a plurality of terminal accommodating chambers
113
and a pair of rear holders
112
which are respectively retained on both sides of the housing
111
.
In addition, inner surfaces of the first and second movable molds
101
and
102
form a cavity for molding the housing
111
of the connector
110
with rear holders in cooperation with the fixed mold. In addition, outer surfaces of the first movable mold
101
, inner surfaces of the second movable molds
102
, and inner surfaces of the third movable molds
103
form cavities for molding the respective rear holders
112
of the connector
110
with rear holders in cooperation with the fixed mold.
In the above-described molding and tentatively retaining mold
100
, when the molding and tentative retention of the connector
110
with rear holders is effected, a resin material is charged into the respective cavities, for instance, from the upper direction in the drawing through unillustrated runners for the respective cavities in a state in which the fixed mold and the movable molds
101
,
102
, and
103
are joined together. Consequently, the housing
111
and the rear holders
112
of the connector
110
with rear holders are molded independently, respectively.
Next, the first movable mold
101
is moved upwardly in the drawing, and the second movable molds
102
are respectively moved in the directions of arrows in the drawing. Consequently, predetermined gaps are respectively produced between the respective rear holders
112
and the housing
111
. In this state, the third movable molds
103
are respectively moved toward the housing
111
so as to tentatively retain the rear holders
112
onto the side surfaces of the housing
111
.
Then, after the housing
111
and the rear holders
112
are tentatively retained, the third movable molds
103
are returned to their original positions by urging forces of unillustrated springs. This series of operation including the movement of the third movable molds
103
toward the housing
111
and the movement thereof in directions away from the housing
111
after the tentative retention of the rear holders
112
is effected continuously almost without stopping.
Subsequently, the connector
110
with rear holders in a tentatively retained state is released from the mold, and is transferred to an ensuing process of insertion of connecting terminals.
With the above-described conventional molding and tentatively retaining mold
100
, when the rear holders
112
are relatively moved with respect to the housing
111
by the third movable molds
103
and are tentatively retained, after the third movable molds
103
are moved by an amount necessary for tentative retention of the rear holders
112
, the operation of returning the third movable molds
103
to their original positions is effected by the urging forces of the springs.
However, there has been a problem in that the rear holders
112
tentatively retained onto the housing
111
become dislocated from the housing
111
in conjunction with the returning operation of the third movable molds
103
owing to the softness and the like of the rear holders
112
immediately after molding.
SUMMARY OF THE INVENTION
The object of the invention is to provide a molding and tentatively retaining mold and a method of molding and tentative retention which make it possible to relatively move and reliably retain at least one part with respect to another part by movable molds after molding and to prevent the trouble of such as the cancellation of tentative retention of the parts.
The above object can be attained by a molding and tentatively retaining mold comprising a plurality of movable molds provided in such a manner as to be relatively movable with respect to said fixed mold and adapted to respectively mold a plurality of kinds of independent parts of different shapes in a plurality of cavities formed in cooperation with said fixed mold, and to relatively move at least one part with respect to another part after molding so as to set said parts in a tentatively retained state; and a plurality of runners respectively provided for the cavities to charge a molding material into the cavities, wherein an amount of movement of said movable mold at a time when said at least one part is relatively moved with respect to said other part and is tentatively retained after molding is set to be greater by a predetermined amount of movement than an amount of movement necessary for tentatively retaining said at least one part to said other part, and said movable mold after movement is stopped at a moved position until a predetermined time elapses.
In the molding and tentatively retaining mold constructed as described above in accordance with the invention, a molding material is charged into a plurality of cavities formed between the fixed mold and the movable molds through runners. Consequently, a plurality of kinds of independent parts of different shapes is respectively molded in the cavities.
After the molding of the respective parts, the movable mold moves so as to cause at least one part to relatively move with respect to another part. Namely, as the movable mold moves towards the other part, one part interposed therebetween is retained onto the other part in a tentatively retained state. At this juncture, the amount of movement of the movable mold is set to be greater by a predetermined amount than an amount of movement necessary for moving the one part. Namely, the movable mold moves toward the other part additionally by a very small length more than an amount of movement necessary for tentative retention of the one part, and the movable mold is so set as to stop at the moved position until a predetermined time elapses. Consequently, the at least one part moved by the movable mold is tentatively retained reliably onto the other part without coming off.
In addition, the above object can be attained by a method of molding and tentatively retaining comprising, molding a plurality of kinds of independent parts of different shapes in a plurality of cavities formed between a fixed mold and a plurality of movable molds provided in such a manner as to be relatively movable with respect to said fixed mold by charging a molding material into said cavities through runners respectively provided for said cavities, and at least one part is relatively moved with respect to another part after molding so as to set said parts in a tentatively retained state, wherein, an amount of movement of said movable mold at a time when said at least one part is relatively moved with respect to said other part by said movable mold and is tentatively retained after molding is set to be greater by a predetermined amount of moveme
Hamamoto Junich
Hiraguchi Kazuhiko
Kawamura Norio
Masuda Takashi
Murashita Hiroshi
Fontaine Monica A.
Sughrue & Mion, PLLC
Tentoni Leo B.
Yazaki -Corporation
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