Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Reexamination Certificate
2001-08-08
2003-10-14
Heitbrink, Jill L. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
C264S328120
Reexamination Certificate
active
06632392
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a connector housing having a shape to prevent short shot of resin material to partitions and sidewall portions of a terminal accommodating chamber and also to a manufacturing method of the connector housing.
2. Description of the Related Art
FIG. 8
shows an example of a prior art connector housing.
A connector housing
31
is formed of synthetic resin has a plurality of terminal accommodating chambers
32
arranged in two steps. The terminal accommodating chambers
32
are sectioned with vertical partitions
33
, horizontal partitions
34
, upper and lower wall portions
35
,
36
, and right and left wall portions
37
,
38
.
A terminal
39
is inserted into each of the terminal accommodating chambers
32
through respective rear openings and is primarily engaged by means of a resilient engaging lance (not shown) arranged inside the terminal accommodating chamber
32
. The terminal
39
has, in the front half, a boxlike electrically contacting portion
41
having inside a spring portion
40
for contact and a wire pressure-welding portion
42
in the rear half. The terminal
39
of this example is a female type, and a male type terminal (not shown) is accommodated in a connector housing
31
.
The connector housing
31
is integrally provided, through long hinges
44
, with top and bottom pair of rear holders
43
for secondary engaging the terminal
39
. Each of the rear holders
43
has an engaging projection
45
for engaging the terminal. And, the rear holders
43
are inserted into the connector housing
31
through respective rear openings
46
. The engaging projection
45
enters inside terminal accommodating chamber
32
so as to engage a rear end
41
a
of the electrically contacting portion
41
of the terminal
39
. As described above, the terminal
39
is double locked by means of the engaging lance and the engaging projection
45
. The hinges
44
are accommodated inside the openings
46
.
The connector housing
31
is formed by injecting a melted resin material into an unshown metal mold and cooling down the resin material. At the same time, the rear holders
43
and the hinges
44
are integrally formed therewith.
With respect to the above connector housing
31
and the manufacturing method thereof, however, especially in case the pitch between the terminals
39
has to be small, thickness of the partitions
33
,
34
is partially likely to become less than a defined one because of a short shot in the injection molding, because the vertical partitions
33
and the horizontal partitions
34
have to be thin, thereby causing the rare-short due to poor insulation between the terminals.
And, there could be a case of thinly making the sidewalls
37
,
38
for downsizing the connector housing
31
, and also thickness of the sidewalls
37
,
38
is likely to become less than a determined one, also thereby causing the rare-short due to poor insulation between the terminals and the outside of the housing
31
.
Besides, the rear half portions of the sidewalls
37
,
38
have to be thinly made because a space for accommodating the hinges
44
have to be arranged, which also brings about the short shot in the injection molding of the sidewalls
37
,
38
.
SUMMARY OF THE INVENTION
In view of the foregoing, an object of the present invention is to provide a connector housing and a manufacturing method thereof, wherein a short shot on partitions and sidewall portions of a connector housing in the resin-molding can be securely prevented so as to secure a defined thickness of the partitions and the sidewall portions.
In order to achieve the above-described object, as a first aspect of the present invention, a connector housing comprises: an outside wall having an upper and lower walls and sidewalls; horizontal partition and vertical partition which form terminal accommodating chambers inside the outside wall; and a thin sidewall portion formed on each of the sidewalls and being thinner than a remaining portion of the corresponding sidewall, wherein a short shot preventing rib is longitudinally formed on the thin sidewall portion integrally therewith in a generally vertical center thereof.
As a second aspect of the present invention, in the structure with the above first aspect, the short shot preventing rib projects outside over the remaining portion continuing from the thin sidewall portion.
As a third aspect of the present invention, in the structure with the above first or second aspect, the short shot preventing rib is arranged in a line with the horizontal partition.
As a fourth aspect of the present invention, in the structure with the above third aspect, the short shot preventing rib is formed thicker than the horizontal partition.
As a fifth aspect of the present invention, a manufacturing method of connector housing comprises the steps of: setting a mold for molding a connector housing which has a short shot preventing rib on each of thin sidewall portions formed on both side walls; arranging a gate of a runner at a position corresponding to an outside wall of the connector housing; and injecting a melted resin material into the mold through the gate for forming the connector housing, wherein the short shot preventing rib is formed on each of the thin sidewall portions integrally therewith.
According to the above-described structure of the present invention, the following advantages are provided.
(1) In the injection molding, because the melted resin material flows from the thick sidewall portion side to the rib side, the thin sidewall portion is securely filled up with the resin material. Therefore, the short shot on the thin sidewall portions can be prevented and the insulation between the terminals in the terminal accommodating chambers and the outside can be secured, thereby preventing the rare-short. And, because the melted resin material is introduced from the rib side toward the horizontal partitions and further is introduced from the horizontal partitions to the vertical partitions, the short shot on the portions and on the partitions can be prevented. Therefore, the insulation among the terminals in the accommodating chambers can be secured, thereby preventing the rare-short.
(2) After the melted resin material has flown into the thick sidewall portion, a flow of the resin material to the rib side increases, thereby improving the above effect.
(3) Because the resin material smoothly flows into the horizontal partition from the rib side, the horizontal partition and the vertical partition can be securely filled up with the resin material.
(4) Because a cross section of the rib is large, quantity and velocity of the resin material flown into the rib increase, thereby further improving the above effects.
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4743420 (1988-05-01), Dutt
patent: 5071374 (1991-12-01), Plocek et al.
patent: 5120269 (1992-06-01), Endo et al.
patent: 5482479 (1996-01-01), Hayashi et al.
patent: 5554038 (1996-09-01), Morlion et al.
patent: 5580264 (1996-12-01), Aoyama et al.
patent: 6319074 (2001-11-01), Kashiyama
patent: 6468459 (2002-10-01), Suzuki
Armstrong Westerman & Hattori, LLP
Heitbrink Jill L.
Yazaki -Corporation
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