Plastic and nonmetallic article shaping or treating: processes – Combined
Reexamination Certificate
2001-09-20
2004-03-02
Colaianni, Michael (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Combined
C264S318000, C264S328100, C264S334000
Reexamination Certificate
active
06699420
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a connector. The connector has rear holders which are first molded together with a housing in a plurality of molds. Then, the rear holders are temporarily retained in the housing as the molds are removed and regularly retained therein after connecting terminals are inserted. And the present invention relates to a method of manufacturing thereof.
2. Related Art
Heretofore, there exist various connectors with rear holders and methods of manufacturing such connectors with rear holders known to the art as disclosed in JP-A-8-250183, for example.
In a connector
51
with related rear holders shown in
FIGS. 16
to
18
, rear holders
70
a
and
70
b
that are temporarily and regularly retained in such a manner as to be laid across opposite side portions of a housing
52
are held in the temporarily retaining positions. The housing has a plurality of terminal housing chambers
53
. Then connecting terminals
32
are inserted from the rear end of the housing
52
and respectively retained by housing lances
81
in the terminal housing chambers
53
. Further, the rear holders
70
a
and
70
b
are retained in the regularly retaining positions, so that the connecting terminals
32
are doubly retained therein.
More specifically, stooping guide holes
72
are provided in the respective side pieces of the rear holder
70
a
. Secondary retaining projections
73
for secondarily retaining each connecting terminal
32
are provided in the front end portion of the undersurface of the rear holder
70
a
. Openings
53
a
for inserting the secondary retaining projection
73
obliquely above from the temporarily retaining position to the regularly retaining position is provided in the upper central portion of each terminal housing chamber
53
. On opposite sides
52
b
of the housing
52
, there are also provided a stooping guide rail
54
having a tapered surface engaged with the guide hole
72
, and a regularly retaining projection
55
that is obliquely positioned in front of each guide rail
54
.
As opposite sides
52
b
, where the guide rails
54
and the regularly retaining projections
55
are projected, are set narrower than the whole width of the opposite sides
52
a
of the front portion, jutties
56
are set to opposite sides
52
b
in parallel to and below the guide rails
54
and the regularly retaining projections
55
whereby to make opposite sides
52
b
equal in width to opposite sides
52
a
. Because the lower rear holder
70
b
in the drawings is substantially equal in structure to the rear holder
70
a
, the description thereof will be omitted.
In the connector
51
with the related rear holders, the tapered surface provided on the surface of each guide rail
54
causes the side pieces
71
are bent to opposite directions when the rear holder
70
a
on one side is forced in from above the rear end portion of the housing
52
. Thus the guide holes
72
are mated with the guide rails
54
, so that the rear holder
70
a
is held in the temporarily retaining position of the housing
52
. Moreover, the rear holder
70
b
is also held in the temporarily retaining position of the housing
52
.
When the connecting terminal
32
is subsequently inserted from behind the terminal housing chamber
53
, it is primarily retained by the housing lance
81
. When the rear holder
70
a
and the rear holder
70
b
are pressed forward, the guide holes
72
are guided by the guide rail
54
so and the front ends of the side pieces
71
climb over the regularly retaining projections
55
. Then the front end portions of the guide holes
72
is retained by the regularly retaining projections
55
and the secondary retaining projections
73
are caused to enter the terminal housing chambers
53
from the openings
53
a.
In a case where the housing
52
and the rear holders
70
a
and
70
b
are separately formed before being gathered at one place for the assembly of them, however, it becomes necessary carrying them to fabrication places and performing not only assembly but also inspection steps in addition to individually controlling such parts as housings
52
and rear holders
70
a
and
70
b.
In order to improve this situation, it has also be proposed to provide a connector with rear holders through the steps of temporarily retaining and incorporating the rear holders
70
a
and
70
b
in the housing
52
simultaneously with the use of a mold shown in
FIG. 19
, and then taking the rear holders out of the mold.
A temporarily retaining mold
90
shown in
FIG. 19
is formed with a front fixed mold (not shown), a first movable mold
92
that is moved vertically, a pair of second movable molds
93
and
93
that are moved laterally, and a pair of third movable molds
94
and
94
that are moved longitudinally.
The central housing
52
in
FIG. 19
is molded inside the first and second movable molds
92
and
93
. The rear holders
70
a
and
70
b
are molded outside the first movable mold
92
, inside the second movable mold
93
and inside the third movable mold
94
.
In other words, the housing
52
and the rear holders
70
a
and
70
b
are formed in such a condition that the fixed and the movable molds have been joined together and then the first movable mold
92
is pulled up and subsequently the second movable molds
93
and
93
are separated laterally. Consequently, a space is produced between the rear holders
70
a
and
70
b
and the housing
52
, and the third movable molds
94
and
94
are moved in the direction of the housing. Then the guide holes
72
of the rear holders
70
a
and
70
b
are retained by the guide rails
54
of the housing
52
, and the rear holders
70
a
and
70
b
are temporarily retained by the housing
52
. Further, the third movable molds
94
are separated from the housing
52
, whereby the housing
52
in which the rear holders
70
a
and
70
b
have been retained temporarily is taken out of the temporarily retaining mold
90
.
In the connector
51
with the related rear holders, high dimensional precision is required during the molding process to have the slot-like guide holes
72
respectively retained by the guide rails
54
and the regularly retaining projections
55
so as to have the rear holders
70
a
and
70
b
temporarily and regularly retained in the housing
52
. Therefore, the retaining operation above is problematical as it has resulted in not only lowering productivity but also increasing the production cost.
Another problem is that the molding structure becomes complicated because it is necessary for the first movable mold
92
of the temporarily retaining mold
90
to move vertically, for the second movable molds
93
to move laterally and moreover for the third movable molds
94
to move longitudinally.
SUMMARY OF THE INVENTION
An object of the present invention made in view of the foregoing problems is to provide an inexpensive connector with rear holders requiring no high dimensional precision in particular for the rear holders to be molded during molding operation for which employable movable molds need less moving.
The foregoing problems can be solved by a connector with rear holders according to the invention as described in the following items 1) to 3)
1) A connector comprising:
a housing;
a plurality of terminal housing chambers for respectively housing connecting terminals provided at the housing;
a rear holder adapted to be retained at a temporarily retaining position of the housing which the connecting terminals are respectively housed in the plurality of terminal housing chambers and a regularly retaining position of the housing which the connecting terminals are respectively retained in the plurality of terminal housing chambers;
a retaining hole provided at inside the rear holder;
a retaining pawl having a tilting face provided at inside the rear holder;
a temporarily retaining projection having a tapered surface engaged with the retaining hole provided at the housing;
a tapered retaining step engaged with the retaining pawl provided at the housing;
Colaianni Michael
Fontaine Monica A
Yazaki -Corporation
LandOfFree
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