Molded product

Details Molded product Molded product

1998-05-07

2001-02-13

Dixon, Merrick (Department: 1774)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including fastener for attaching to external surface

C428S212000, C428S432000

Reexamination Certificate

active

06187410

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a molded product which is produced through secondary molding (e.g. injection molding) to a primary molded product, and specifically relates to a shape of a molded product wherein a fluid balance of molten resin is considered at the time of the secondary molding.
2. Background
A molded product of this kind is shown in
FIGS. 8 and 9
b
.
FIGS. 8 and 9
b
show a connector
1
′ as a molded product. The connector
1
′ includes a connector component
2
as a primary molded product which is shown in
FIGS. 8 and 9
a
, and a molded product main body
3
′ which is formed through secondary molding of molten resin with the connector component
2
.
The connector component
2
is utilized in order to fix pitches of a plurality of terminals
4
which are formed by insert molding into the connector component
2
, and also utilized for improvement in operational efficiency at secondary molding of the molded product main body
3
′. In the case where the connector
1
′ is secondarily molded by using the connector component
2
, the connector component
2
is placed inside the cavity of an injection molding die (not shown) so that a primary mold surface
2
a
where the terminals
4
of the connector component
2
protrude will be made flush with a secondary mold surface
3
a
inside a socket part
5
(an opening for fitting a mating connector) of the molded product main body
3
′ after the secondary molding. Then, molten resin is injected into the cavity of the injection molding die to form the connector
1
′ through the secondary molding.
In the conventional connector
1
′, however, since the connector component
2
is placed approximately at the vertical center of the cavity of the injection molding die at the time of the secondary molding (that is, the connector component
2
is placed inside the cavity of the injection molding die at the approximate center thereof so that the primary mold surface
2
a
where the terminals
4
of the connector component
2
protrude will be made flush with the secondary mold surface
3
a
inside the socket part
5
of the molded product main body
3
′ after molding), the flow amount (X′) of the molten resin, which flows inside the cavity for forming the molded product main body
3
′ along the lower side B, is extremely larger than the flow amount (Y′) of the molten resin which flows inside the cavity along the upper side A. That is, the relation between the flow amount (X′) and the flow amount (Y′) is:
X′>Y′.
Accordingly, as indicated by C in
FIG. 9
b
, there is a possibility that the opening of the socket part
5
of the molded product main body
3
′ is downwardly drawn at the time of the secondary molding so that the opening of the socket part
5
is deformed in a curved manner.
Furthermore, since the connector component
2
which is placed inside the cavity blocks the resin flow, a short shot is liable to occur from shortage in the amount of resin flowing to the socket
5
side.
SUMMARY OF THE INVENTION
It is an object of the invention to solve the above problems and to provide, at a low-cost, a highly-accurate molded product in which deformation of the molded product main body, which is liable to be generated at the time of the secondary molding, is surely prevented, and also occurrence of short shots is prevented.
According to the first aspect of the invention, there is provided a molded product which comprises a primary molded product; and a molded product main body formed through secondarily molding to the primary molded product so that primary mold surfaces of the primary molded product are disposed inside secondary mold surfaces of the molded product main body.
In the molded product, since resin is entirely molded and evenly over the primary molded product at the second molding, short shots and deformation in the molded product main body can not occur.
According to the second aspect of the invention, the primary molded product is a connector component comprising a plurality of terminals, the primary mold surfaces where the terminals protrude are disposed inside the secondary mold surfaces of the molded product main body.
This molded product enables provision of highly-accurate connectors at a low-cost.
According to the third aspect of the invention, the primary molded product is a connector component comprising a supporting wall part and a plurality of terminals protrude from the supporting wall part, the molded product main body comprises a socket part in which the terminals are provided, the supporting wall part has a through hole, for allowing molten resin to flow into the socket part during the secondary molding, formed in the supporting wall part at a position confronting a part of the socket part.
In this molded product, since a sufficient amount of resin flows into the cavity for formation of the socket part through the through hole which is formed in the primary molded product, occurrence of short shots is prevented.
According to the fourth aspect of the invention, the through hole opens wider on a downstream side than on an upstream side of resin flow, with the socket part as a border during the secondary molding.
In this molded product, since resin sufficiently flows thoroughly to the downstream side of the socket part, sufficient thickness of the socket part can be ensured and toughness of the socket part can be enhanced.
According to the fifth aspect of the invention, the socket part is an opening in which a mating connector is fittable.
In the molded product, the socket part is reinforced.


REFERENCES:
patent: 3597663 (1971-08-01), Markarian
patent: 3978378 (1976-08-01), Tigner et al.

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