Electrical connectors – Contact comprising cutter – Insulation cutter
Reexamination Certificate
1999-03-18
2001-03-27
Nguyen, Khiem (Department: 2839)
Electrical connectors
Contact comprising cutter
Insulation cutter
Reexamination Certificate
active
06206721
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pressure contact terminal having pressure contact cutting edges which are formed so that a pair of pressure contact plates are projected from a pair of side plates with them facing each other.
2. Description of the Related Art
FIG. 1
shows a pressure contact terminal
1
disclosed in Japanese Patent Application Publication, Specification No. 63-23626 (1988). In this drawing, the pressure contact terminal
1
is composed of a contact section
2
, a pressure contact section
3
and an electric wire holding section
4
which are formed by successively bending sheet metallic material with uniform thickness. Four pressure contact cutting edges
5
,
6
,
7
and
8
are formed on the pressure contact section
3
along an axial direction of a covered electric wire. These pressure contact cutting edges
5
,
6
,
7
and
8
are constituted so that both sides of insertion slots
9
into which the covered electric wire is inserted are cutting edge sections
10
, and when the covered electric wire is press-fitted into the insertion slots
9
, the covered electric wire is cut by the cutting edge sections
10
. When a core wire section is connected with the cutting edge sections
10
, the pressure contact terminal
1
is electrically connected with the covered electric wire.
In this pressure contact terminal
1
, the insertion slots
9
of the four pressure contact cutting edges
5
,
6
,
7
and
8
are set so as to have different widths, namely, the pressure contact cutting edge
5
is used only for a thin electric wire, the pressure contact cutting edge
6
is used only for a thick electric wire, and the pressure contact cutting edges
7
and
8
are commonly used for thin and thick electric wires. As a result, electric wires having different sizes can be press-fitted commonly into one pressure contact terminal.
Incidentally, in the case where the widths of the insertion slots
9
of the pressure contact cutting edges are set like the above pressure contact terminal
1
, for example, when the combination of the pressure contact cutting edge
5
having the insertion slot
9
with narrow width and the two pressure contact cutting edges
6
and
7
having the insertion slots
9
with width wider than that of the insertion slot
9
of the pressure contact cutting edge
5
are is used for electric wires with different sizes, the three pressure contact cutting edges
5
,
6
and
7
cut into the covered portion of the thin electric wire satisfactorily. As a result, satisfactory contact can be obtained, and further a holding force of the electric wire in the axial direction can be obtained sufficiently.
However, when a thick electric wire is press-fitted into the insertion slot
9
of the pressure contact cutting edges
5
,
6
and
7
, the pressure contact cutting edge
5
having the narrow insertion slot
9
whittles the core wire portion of the thick electric wire, and satisfactory contact is obtained only for the two pressure contact cutting edges
6
and
7
having the wide insertion slots
9
. For this reason, since the thick electric wire is press-fitted into and held at the two pressure contact cutting edges
6
and
7
, the holding force in the axial direction becomes weaker, and the sufficient holding force cannot be obtained.
SUMMARY OF THE INVENTION
The present invention has been achieved with such points in mind.
It therefore is an object of the present invention to provide a pressure contact terminal which is capable of preventing a core wire portion of a thick electric wire from being whittled, obtaining satisfactory contact at all pressure contact cutting edges, and bringing electric wires with different sizes into press-contact therewith commonly.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a pressure contact terminal, comprising: a bottom plate; a pair of side plates rising from both sides of the bottom plate in same direction; and a plurality of pressure contact cutting edges, the pressure contact cutting edges formed in a manner such that a pair of pressure contact plates are projected from the pair of the side plates so as to face each other, the pressure contact cutting edges formed with a plurality of pressure contact slots into which a covered electric wire is press-fitted so that the covered electric wire is press-fitted between the pressure contact plates; wherein the plurality of pressure contact cutting edges contains at least two wide pressure contact cutting edges having the pressure contact slots with wide width and a narrow pressure contact cutting edge having the pressure contact slot with narrower width than that of the pressure contact slots of the wide pressure contact cutting edges; wherein the wide pressure contact cutting edges are arranged along an axial direction of the covered electric wire; and wherein the narrow pressure contact cutting edge is arranged between the wide pressure contact cutting edges.
In this pressure contact terminal, when a thick electric wire is press-fitted into the plural pressure contact cutting edges, the satisfactory contact with the core wire portion of the thick electric wire can be obtained at the wide pressure contact cutting edges. Moreover, since the pair of the side plates spread outward, even in the case of the thick electric wire, its core wire portion is not whittled by the narrow pressure contact cutting edges, and thus the satisfactory contact can be obtained. Therefore, even in the case of the thick electric wire, the satisfactory contact can be obtained at the plural pressure contact cutting edges, and the holding force does not weaken.
According to second aspect of the present invention, there is provided the pressure contact terminal which is constituted so that at least two narrow pressure contact cutting edges are arranged between the wide pressure contact cutting edges.
In this pressure contact terminal, when a thick electric wire is press-fitted into the four pressure contact cutting edges, the satisfactory contact with the core wire portion of the thick electric wire can be obtained at the wide pressure contact cutting edges on both side of the axial direction. Moreover, since the pair of the side plates spread outward, even in the case of the thick electric wire, its core wire portion is not whittled by the two narrow pressure contact cutting edges, and thus the satisfactory contact can be obtained. Therefore, even in the case of a thick electric wire, the satisfactory contact can be obtained at the plural pressure contact cutting edges, and the holding force does not weaken.
REFERENCES:
patent: 4291935 (1981-09-01), Badoz et al.
patent: 4346955 (1982-08-01), Chesnais et al.
patent: 4648673 (1987-03-01), Endo et al.
patent: 5588868 (1996-12-01), Tsuji et al.
patent: 5879182 (1999-03-01), Abe
patent: 5913695 (1999-06-01), Okabe
patent: 5928025 (1999-07-01), Abe
patent: 5980300 (1999-11-01), Okabe
patent: 6033255 (2000-03-01), Murofushi
patent: 6077103 (2000-06-01), Saka et al.
patent: 63-23626 (1988-05-01), None
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Nguyen Khiem
Yazaki -Corporation
Zarroli Michael C.
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