Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Reexamination Certificate
2000-05-16
2002-10-22
Vargot, Mathieu D. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
C264S272110, C264S328120, C425S812000
Reexamination Certificate
active
06468459
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a packing-integrated type connector in which a break in a seal lip portion of waterproof packing which is formed integrally with a connector housing is prevented as well as a method of manufacturing the same.
2. Related Art
FIGS. 6
to
7
show a conventional packing-integrated type connector and a method of manufacturing the same.
This packing-integrated type connector C″ is arranged such that rubber-made waterproof packing
30
is formed integrally with a synthetic resin-made connector housing
1
.
The connector housing
1
has two terminal accommodating chambers
31
(
FIG. 7
) arranged in parallel in an elliptic housing body
2
, and has a hood portion
10
(
FIG. 7
) provided concentrically on the outer side of the housing body
2
. A terminal retaining lance
32
(
FIG. 7
) is formed in each of the terminal accommodating chambers
31
. A pair of terminal inserting holes
34
for a mating female connector (not shown) are formed in a front end wall
33
of the housing body
2
in such a manner as to continue from the terminal accommodating chambers
31
, while a pair of openings
35
(
FIG. 7
) for inserting female terminals (not shown) into the terminal accommodating chambers
31
are formed in a rear-end portion of the housing body
2
. Each of the openings
35
continues to a large diameter portion for inserting and fitting a waterproof rubber plug (not shown).
The packing
30
is provided on the outer periphery of a rear half side of the housing body
2
on the inner side of the hood portion
10
. Two seal lip portions
37
which are brought into contact with an inner wall surface of a mating female connector housing (not shown) are formed on a front portion of the packing
30
. The seal lip portions
37
are formed projectingly with a greater diameter than that of a peripheral wall portion
38
(
FIG. 7
) of the packing
30
.
As shown in
FIG. 7
, the formation of the packing
30
is effected by inserting a mold
39
between the hood portion
10
and the housing body
2
to form a packing forming gap
40
, and by injecting fluid (liquid) silicone rubber
30
′, which is a packing material, into the packing forming gap
40
through an injection hole
17
penetrating a bottom wall
11
′ of the hood portion
10
. The injection hole
17
continues to a silicone injecting core
4
. In addition, a vent hole
15
is provided in a bottom wall
11
of the hood portion
10
on the 180° opposite side of the injection hole
17
, and the vent hole
15
continues to a vent core
5
on the outer side. The silicone rubber
30
′ is injected into the packing forming gap
40
from the silicone injecting core
4
, and the air inside the packing forming gap
40
is discharged through the vent hole
15
.
With the conventional arrangement, however, since the seal lip portions
37
of the packing
30
are located at a position remote from the silicone injecting core
4
, there have been cases where, particularly on the 180° opposite side of the silicone injecting core
4
(on the vent core
5
side), the silicone rubber
30
′ fails to flow completely round to (fails to fill) seal lip portions
37
′ and a break
41
occurs from the time the silicone rubber
30
′ is injected into the packing forming gap
40
from the silicone injecting core
4
until it reaches the vent core
5
. In the event that the break
41
occurs in the seal lip portions
37
′, the waterproof seal characteristic declines, so that such products are inevitably disposed of as defective products, resulting in the deterioration of the yield.
SUMMARY OF INVENTION
In view of the above-described aspect, an object of the present invention is to provide a packing-integrated type connector in which a break in a seal lip portion of packing due to the short shot of the packing material can be reliably prevented as well as a method of manufacturing the same.
To attain the above object, the present invention adopts a packing-integrated type connector in which a vent hole and packing having a seal lip portion are formed in a connector housing, characterized in that a thin-walled portion is formed on the packing between the seal lip portion and the vent hole, whereby the resistance of flow of a fluid packing material toward the vent hole is increased by the thin-walled portion, thereby allowing the packing material to be reliably filled in the seal lip portion.
It is possible to adopt a structure in which a short-shot preventing rib is formed on the connector housing contiguously to the thin-walled portion. In addition, it is also effective to adopt an arrangement in which a pair of short-shot preventing ribs are formed as the short-shot preventing rib, and the packing continues to the vent hole via the pair of short-shot preventing ribs.
In addition, the present invention also adopts a method of manufacturing a packing-integrated type connector in which a fluid packing material is injected between a mold and a connector housing, and air is led out from a vent hole in the connector housing so as to form packing having a seal lip on the connector housing, comprising the steps of: forming a short-shot preventing rib in the mold; and causing the packing material to reach the vent hole via a narrow gap between the short-shot preventing rib and the connector housing.
The short-shot preventing rib may be formed on the connector housing instead of the mold, and the packing material may be caused to reach the vent hole via a narrow gap between the short-shot preventing rib and the mold. In addition, it is also effective to form a pair of short-shot preventing ribs as the short-shot preventing rib, and cause the packing material to reach the vent hole via the pair of short-shot preventing ribs.
REFERENCES:
patent: 5948991 (1999-09-01), Nomura et al.
patent: 5986316 (1999-11-01), Toyoda et al.
patent: 62-111711 (1987-05-01), None
patent: 6-310201 (1994-11-01), None
patent: 8-162251 (1996-06-01), None
Vargot Mathieu D.
Yazaki -Corporation
LandOfFree
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