Press-in contact and manufacturing method thereof

Details Press-in contact and manufacturing method thereof Press-in contact and manufacturing method thereof

1999-04-13

2001-05-15

Sircus, Brian (Department: 2839)

Electrical connectors

With insulation other than conductor sheath

Metallic connector or contact secured to insulation

C439S082000

Reexamination Certificate

active

06231402

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a structure of a press-in contact and a manufacturing method thereof. More particularly, this invention relates to a structure of a press fitting section of a press-in contact and manufacturing method thereof. The press-in contact is used to implement mechanical fixing and solderless electrical connecting by forcing a contact pin used as a connector into through-hole of a printed board.
DESCRIPTION OF THE PRIOR ART
The conventional structure and manufacturing method of a press-in contact will be described by referring to the drawings.
FIGS. 1
to
8
are views showing a structure and a manufacturing method of the conventional press-in contact.
FIGS. 1
to
4
show a first conventional example, and
FIGS. 5
to
8
show a second conventional example.
FIG. 1
is a perspective view for explaining the first conventional example.
FIG. 2A
is a plan view observing
FIG. 1
from above, and
FIG. 2B
is a cross sectional view of a through-hole section of a substrate into which the press-in contact is inserted.
FIG. 3
is an elevation view showing a press fitting cross section of line III—III of FIG.
2
A.
FIG. 4
is a view showing a cross section of a press fitting section after insertion of the press-in contact into the through-hole.
Referring to
FIGS. 1
to
4
, the press-in contact comprises a concave shaped groove
51
formed in the direction of insertion (length direction), a press fitting section
52
having two concave sections
71
,
72
provided at an opposite face of the concave shaped groove
51
, a post section
54
which is at the pointed end of the press-in contact, and a transition section
53
which connects the press fitting section
52
to the post section
54
.
The press-in contact constituted above is inserted into the through-hole
62
of the printed board
61
. At this time, a beam (
73
,
74
,
75
of
FIG. 3
or
76
,
77
,
78
of
FIG. 3
) which is formed at both sides of the press fitting section
52
of the press-in contact is deformed, thus contacting internally with metallic film
63
formed on the inside of the through-hole
62
. That is to say, it assumes the shape of compliant press-in.
Next, deformation of the press fitting section
52
before and after forcing the press-in contact into the through-hole
62
will be described.
As shown in
FIG. 3
, an internal edge section of the press fitting section
52
, before forcing it into the through-hole
62
, is formed by the concave U-shaped groove
51
. Further, an external edge section comprises an arm section
75
provided with contact sections
73
,
74
for contacting with the metallic film
63
of the through-hole
62
, an arm section
76
having a symmetrical shape about the center line of the concave shaped groove
51
, is provided with contact sections
77
,
78
, solid sections
80
having convex shaped circular arc
79
at the external section for contacting with the metallic film
63
, and connecting sections
55
,
56
for connecting the solid section
80
to respective arm sections
75
,
76
.
As shown in
FIG. 4
, the press fitting section
52
is forced into the through-hole
62
. A total of five contact points—
73
,
74
,
77
,
78
, and
79
—make contact with the metallic film
63
. The arm sections
75
,
76
are deformed toward the inside direction of the concave shaped groove
51
, with the connecting sections
55
,
56
as the center of rotation, and are thus electrically connected to the metallic film
63
.
A characteristic of the first conventional example, when the press fitting section
52
is forced into the through-hole
62
whose diameter is different, there are total of five contact points, such as contact sections
73
,
74
,
77
,
78
, and circular arc
79
contacting with the through-hole, and deformation of the arm sections
75
,
76
occurs mainly during rotation of
75
,
76
toward the concave shaped groove
51
, with the connecting sections
55
,
56
acting as the center of rotation. The configuration of the conventional example is disclosed in Japanese Utility Model Laid-Open No. HEI 2-1870.
A second conventional example is now described by referring to the drawings.
FIG. 5
is a perspective view for explaining the second conventional example.
FIG. 6A
is a plan view observing
FIG. 5
from above.
FIG. 6B
is a cross sectional view of through-hole section of a board into which press-in contact is inserted.
FIG. 7
is an elevation view showing a press fitting cross section of VII-VII′ line of FIG.
6
A.
FIG. 8
is a view showing a cross section of a press fitting section after insertion of the press-in contact into the through-hole.
Referring to
FIGS. 5
to
8
, the press-in contact comprises a press fitting section
82
having concave shaped groove
81
formed in the direction of insertion (length direction), a post section
84
which is the pointed end of the press-in contact, and a transition section
83
which connects the press fitting section
82
to the post section
84
.
The press-in contact constituted above, when forced into the through-hole of the printed board
91
, contacts internally with the metallic film
93
which forms an internal face of the through-hole
92
, and assumes the shape of a compliant press-in.
The state of deformation of the press fitting section
82
before and after press fitting, at the time of being forced into the through-hole
92
, will now be described by referring to
FIGS. 7
,
8
.
As shown in
FIG. 7
, an internal edge section of the press fitting section
82
, before being forced into the through-hole
92
, is formed by a concave, U-shaped groove
81
having a circular arc
101
at the base section. Further, an external edge section comprises arm sections
105
,
106
having two pieces of circular arcs
103
,
104
for contacting the metallic film
93
of the through-hole
92
, and a straight line section
107
connecting the circular arcs
103
,
104
.
The center of the circular arc
101
of the internal edge section is off-center with respect to the circular arcs
103
,
104
of the external edge section. Both circular arcs have the relationship of an eccentric circle. Thickness of the arm sections
105
,
106
becomes thinner as they are rotated toward the open side of the U-shape.
As shown in
FIG. 8
, the press fitting section
82
is forced into the through-hole
92
. The respective two circular arcs
103
,
104
are in contact with the metallic film
93
. The arm sections
105
,
106
are deformed in the direction of the concave shaped groove
81
, and are thus connected to the metallic film
93
electrically and mechanically.
A characteristic of the second conventional example is that when the press fitting section
82
is forced into the through-hole
92
having a different diameter, contact points with the through-hole consist of pieces of circular arcs
103
,
104
as a whole. The configuration of the conventional example is disclosed in Japanese Patent Application Laid-Open No. HEI 8-31476.
A manufacturing method for a press-in contact according to the first and the second conventional examples described-above will now be discussed.
Generally, the press-in contact is subjected to stamping by a progressive press. Representative manufacturing processes of a progressive type consist of the following four processes: (a) a process for stamping material of press-in contact in the board thickness direction, thus for implementing shape blanking of the post section, the transition section, and the press fitting section, (b) a process for forming an internal edge section and a contact section by a protruded punch, (c) a process for forming, in sequence, an internal edge section, a contact wing section, a connection section, and the base section by a die for forming a protrusion of the base section and the connecting section at an opposite side of a protruded punch, and (d) a process for forming the contact wing section, connection section, and protrusion by smooth circular arc using a face press punch.
In the conventional press-in contact descri

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