Electrical connectors – Preformed panel circuit arrangement – e.g. – pcb – icm – dip,... – Distinct contact secured to panel circuit
Reexamination Certificate
1998-04-20
2001-10-16
Sircus, Brian (Department: 2833)
Electrical connectors
Preformed panel circuit arrangement, e.g., pcb, icm, dip,...
Distinct contact secured to panel circuit
C439S733100
Reexamination Certificate
active
06302711
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a printed board connector for making an electrical connection with a printed board.
2. Description of the Related Art
The connector has multiple terminals. A conventional terminal portion of a contact to be connected to a printed circuit on the printed board is not disposed a sufficient space apart from other members. Therefore, at the time of soldering, solder flux flows into the space and causes various problems. For example, as shown in a front view of
FIG. 6 and a
side view of
FIG. 7
, a conventional connector is provided with a rectangular parallelepiped housing
1
. In the housing
1
, female contacts
2
are provided in the front and in the rear as seen in FIG.
6
. Plural pairs of the front and rear female contacts
2
are arranged transversely in parallel.
In a fixed portion
3
A formed below a contact portion
3
, the female contact
2
is pressed into and fixed in a press-in hole
4
A of a terminal press-in section
4
which is provided substantially in a central portion along the height of the housing
1
. On a terminal portion
5
linearly extended from the fixed portion
3
A a terminal leg
5
A is formed which is bent orthogonally toward the outside of the housing
1
from a substantially central portion of the terminal portion
5
.
Numeral
7
denotes isolation walls which are formed by extended portions of front and rear side walls
1
A and extended to under end surfaces
7
A of the housing
1
. The terminal leg
5
A is drawn to the outside from a pull-out groove
8
which is formed between the isolation walls
7
. The housing
1
is set on an upper surface of a printed board P. The terminal leg
5
A of the female contact
2
is soldered to a printed circuit which is formed on the upper surface of the printed board P.
However, when the housing
1
is set on the printed board P, the under end surfaces
7
A of the isolation walls
7
abut on the upper surface of the printed board P. Additionally, both end faces of the terminal leg
5
A of the female contact
2
are in contact with or adjacent to both side surfaces
8
A of the pull-out groove
8
. Also, an upper surface
5
B of wind portion of the terminal leg
5
A is also in contact with or adjacent to an upper wall surface
8
B of the pull-out groove
8
.
Therefore, when the terminal leg
5
A is soldered to the printed circuit of the printed board P, flux enters the housing
1
via small clearances between the both side surfaces
8
A of the pull-out groove
8
and both end faces of the terminal leg
5
A and between the upper wall surface
8
B and the upper surface
5
B of the wind portion. Further, the flux rises along a contact portion between an inner wall surface
1
B of the housing
1
and the terminal portion
5
by means of capillary phenomenon. The flux climbs up to an under surface of the terminal press-in section
4
which forms an upper portion of the terminal portion
5
.
Also, the female contact
2
is mounted in the housing
1
by cutting the female contact
2
from its carrier and subsequently pressing the female contact
2
into the press-in hole
4
A of the terminal press-in section
4
. Further, the terminal leg
5
A is folded and bent orthogonally toward the outside by using as a guide the under end surface of the upper wall surface
8
B of the pull-out groove
8
. The terminal leg
5
A is thus drawn from the pull-out groove
8
toward the outside. In this case, dispersion arises in the folding and bending angle of the terminal leg
5
A. It is difficult to control dimensions of the terminal legs.
Therefore, since a condition of contact with the printed board is varied, soldering is performed non-uniformly. In some case, a connection defect is caused.
The terminal portion
5
of the female contact
2
has an non-plated broken section which is made by cutting the female contact
2
from the carrier. Also, the terminal leg
5
A is scratched at the time of a bending process. Therefore, the soldered condition is improper. Further, in some cases the rising flux sticks to the contact portion
3
. The movement of the contact portion
3
is restricted. An inserting/pulling force is difficult exerted at the time of engagement with male terminals and at the time of pulling male contacts.
Further, solder (solder paste) passes through the clearance between the under end surface
7
A of the isolation wall
7
and the upper surface of the printed board P to short-circuit the adjoining left and right terminal legs
5
A. In some cases, a so-called soldered bridge is formed.
Also, in the conventional connector of
FIG. 6
, a slope
2
A of a male contact insertion portion on a head of the female contact
2
is positioned as high as an insertion slope
1
D of the housing
1
. Therefore, a tilted tip end of the male contact abuts directly on the slope
2
A, thereby damaging the female contact
2
. When the female contact is repeatedly inserted and pulled out, the tilt is gradually changed. An engagement force of the male contact and the female contact is changed accordingly. Also, right and left holding forces of the tuning-fork shaped right and left contact portions
3
of the female contact are also changed. This easily occurs also when a center line of the slope
2
A is not positioned precisely.
An object of the present invention is to solve the aforementioned conventional problems caused by the sticking and rising of the flux.
SUMMARY OF THE INVENTION
To solve this and other objects, in the invention, in an under portion of a housing in which plural contacts having terminal portions extended downward to contact a printed board are held, an under space common to the terminal portions is formed by disposing stands on both side wall ends. The flux is thus prevented from sticking and rising.
Also, in the case that, in the under space, the terminal portions of the plural contacts are folded, bent and pulled out in a position apart from an under surface of the housing, the flux can be more effectively prevented from sticking and rising. Further, by using as a reference surface one side face of a held portion or fixed portion of the contact, the contact is pressed into and held in a press-in hole of the housing. Then, a position of a center line of a tip-end slope can be precisely maintained.
Also, a head slope of a female contact as a female connector having a tuning-fork shaped contact portion deviates below an insertion slope of the housing. Then, the male contact can be prevented from damaging the female contact.
REFERENCES:
patent: 5145384 (1992-09-01), Asakawa et al.
patent: 5154634 (1992-10-01), Brown et al.
patent: 5192228 (1993-03-01), Collinns et al.
patent: 5257947 (1993-11-01), Scheer et al.
patent: 5498174 (1996-03-01), Speer et al.
Duverne J. F.
Oliff & Berridg,e PLC
Sircus Brian
Taiko Denki Co., Ltd.
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