Electrical connectors – Contact comprising cutter – Insulation cutter
Reexamination Certificate
2002-09-16
2004-02-17
Reichard, Dean A. (Department: 2831)
Electrical connectors
Contact comprising cutter
Insulation cutter
C439S203000, C439S399000, C439S449000, C439S720000
Reexamination Certificate
active
06692290
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a terminal fitting to be electrically connected to an electric wire.
(2) Description of the Related Art
Various electronic instruments are mounted on a motor vehicle. In a motor vehicle, wiring harness is mounted in order to transfer electric power from a power source to the electronic instruments and to transfer a signal from a computer to the electronic instruments. The wiring harness includes a plurality of electric wires (hereinafter, wires)
101
(only one wire being shown in
FIGS. 22A
,
22
B and
22
C by its cross sectional view) tied up in a bundle with each other and terminal fittings attached to the end of the wires
101
. The wire
101
includes an electrically conductive (hereinafter, conductive) core wire
102
and an insulating coating
103
which coats the core wire
102
. The terminal fitting is formed by bending a conductive metal plate. The terminal fitting is electrically connected to the core wire
102
of the wire
101
.
As the terminal fitting, a pressure-welding terminal
100
shown in
FIG. 20
may be utilized. As shown in
FIGS. 20 and 21
, the pressure-welding terminal
100
has a plurality of pressure-welding members
104
. Each pressure-welding member
104
includes a pair of pressure-welding blades
105
,
106
. As shown in
FIGS. 22A
,
22
B and
22
C, in the pressure-welding terminal
100
, a wire
101
is press-fit into between the pressure-welding blades
105
and
106
and then, the blades
105
and
106
cut the coating
103
so as to come in contact with the core wire
102
, thereby the pressure-welding terminal
100
is electrically connected to the wire
101
.
As for the conventional pressure-welding terminal
100
described above, when the wire
101
is press-fit into between the pressure-welding blades
105
and
106
, as shown in
FIG. 22C
, the pressure-welding terminal
100
possibly is plastically deformed in the direction, in which the distance between the pressure-welding blades
105
and
106
increases. If the distance between the pressure-welding blades
105
and
106
increases, each inner edge of the pressure-welding blades
105
and
106
possibly does not come in contact with the core wire
102
of the wire
101
. That is, there has been a problem that the electric connection between the conventional pressure-welding terminal
100
and the wire
101
is possibly not secured.
SUMMARY OF THE INVENTION
It is therefore an objective of the present invention to solve the above problem and to provide a terminal fitting, which securely can be electrically connected to an electric wire.
In order to attain the above objective, the present invention is to provide a terminal fitting comprising:
a bottom wall, on a surface of which an electric wire consisting of a core wire and a coating is placed;
a pair of pressure-welding blades arranged in parallel with each other arising from the bottom wall, each pressure-welding blade including an inner edge for cutting the coating of the electric wire; and
a projection formed on an end of the inner edge of each pressure-welding blade near to the bottom wall, protruding from the end toward the length direction of the electric wire,
wherein the electric wire is press-fit into between the pair of pressure-welding blades, which cuts the coating of the electric wire so as to come in contact with the core wire of the electric wire.
With the construction described above, when the wire is press-fit into between the blades, the wire comes in contact with the projection since the projection is formed on the end of the blade near to the bottom wall. Then, the wire pushes the projection toward the bottom wall. Since the projection is formed on the end of the blade, the blades are displaced in the direction, in which both ends situated at far side from the bottom wall approach each other. That is, the distance between both blades decreases.
Further, the projection protrudes from the end along the length direction of the wire. Therefore, the projection is prevented from coming in contact with the core wire of the wire. That is, the core wire is prevented from being damaged.
Therefore, the distance between both blades is prevented from increasing when the wire is press-fit into between both blades. Each blade securely comes in contact with the core wire, thereby each blade is securely connected electrically to the wire.
Preferably, each projection protrudes in the same direction from the corresponding end.
With the construction described above, when the wire is press-fit into between both blades, the projection securely comes in contact with the wire. Therefore, each blade more securely comes in contact with the core wire and is more securely connected electrically to the wire.
In order to attain the above objective, the present invention is also to provide a terminal fitting comprising:
a bottom wall, on a surface of which an electric wire consisting of a core wire and a coating is placed;
a pair of side walls arising from both edges of the bottom wall; and
first and second pressure-welding members to be pressure-welded to the electric wire, each of which has a pair of pressure-welding blades and a projection protruding from an end of an inner edge of each pressure-welding blade near to the bottom wall, each pressure-welding blade including the inner edge for cutting the coating of the electric wire, and the projection being formed at the end of the inner edge of one pressure-welding blade of the first pressure-welding member near to the bottom wall and formed at the end of the inner edge of the opposite pressure-welding blade of the second pressure-welding member near to the bottom wall,
wherein the one pressure-welding blade continues to one side wall while the opposite pressure-welding blade continues to the opposite side wall, and the electric wire is press-fit into between the pair of pressure-welding blades which cuts the coating of the electric wire so as to come in contact with the core wire of the electric wire.
With the construction described above, the wire press-fit into between both blades comes in contact with the projection and pushes the projection toward the bottom wall. Then, both blades are displaced in the direction, in which both ends of the blade situated at far side from the bottom wall approach each other. Therefore, the distance between the pair of side walls can be prevented from increasing and the distance between the pair of blades can be prevented from increasing. Therefore, each blade more securely comes in contact with the core wire and is more securely connected electrically to the wire.
Preferably, the projection protrudes from the end in the length direction of the electric wire.
With the construction described above, when the wire is press-fit into between the pair of blades, the core wire of the wire can be prevented from coming in contact with the projection. Therefore, the core wire can be prevented from being damaged. Each blade can be more securely connected electrically to the wire.
Preferably, protrusion length of the projection from the end gradually increases as the projection approaches the bottom wall.
With the construction described above, when the wire is press-fit into between the blades, the wire comes in contact with the projection since the projection is formed on the end of the blade near to the bottom wall. Then, the wire pushes the projection toward the bottom wall. Since the projection is formed on the end of the blade, the blades are displaced in the direction, in which both ends situated at far side from the bottom wall approach each other. That is, the distance between both blades decreases. Therefore, each blade more securely comes in contact with the core wire and is more securely connected electrically to the wire.
Preferably, protrusion length of the projection from the end gradually increases as the projection leaves the bottom wall.
With the construction described above, even when the wire is press-fit into between both blades and the wire comes in contact w
Hasegawa Takuya
Sato Kei
Tanaka Shigeru
Yamanashi Makoto
Lee Jinhee J
Reichard Dean A.
Yazaki -Corporation
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