Electrical connectors – Contact comprising cutter – Insulation cutter
Reexamination Certificate
2001-03-21
2001-12-25
Ta, Tho D. (Department: 2833)
Electrical connectors
Contact comprising cutter
Insulation cutter
C439S676000, C439S941000
Reexamination Certificate
active
06332802
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to modular plugs for connecting a plurality of electric wires and harnessed modular plugs and, more particularly, to a modular plug for connecting a plurality of high-speed transmission wires and a harnessed modular plug.
2. Description of the Related Art
Modular jacks and plugs are used for telephone facilities or local area network (LAN). When a modular plug is plugged into a modular jack, the terminals thereof are brought into contact with each other for electrical connection. The arranging pitch of the terminals is specified to be 1.016 mm by the standards. As a result, the modular plug is provided with a device for arranging wires with such an arranging pitch.
Japanese patent application Kokai No. 10-506751 discloses a modular plug with an arranging device and a harnessed modular plug such as shown in
FIGS. 12 and 13
. A modular plug
1
comprises a guide plate
6
for arranging four pairs of wires
2
-
2
′,
3
-
3
′,
4
-
4
′, and
5
-
5
′, a housing
7
for receiving the guide plate
6
, and a plurality of terminals
8
. The wires
2
-
2
′,
3
-
3
′,
4
-
4
′, and
5
-
5
′ are twisted for each pair and covered by an insulating sheath to enhance the electric characteristics. Eight guide apertures
9
are provided in the guide plate
6
in a zigzag fashion in two rows. A plurality of terminal slots
10
extend downwardly from the upper face of the front portion of the housing
7
.
To assemble the modular plug
1
and the harnessed modular plug, the front portions of each pair of the wires
2
-
2
′,
3
-
3
′,
4
-
4
′, or
5
-
5
′ are stripped of a length of the insulating sheath, untwisted, and inserted into the guide apertures
9
such that the wires are arranged in such an order as shown in
FIG. 13
; i.e., from left, the third pair
4
-
4
′, one of the second pair
3
, the first pair
2
-
2
′, the other of the second pair
3
′, and the fourth pair
5
-
5
′. The guide plate
6
is then fitted into the housing
7
, and the terminals
8
are inserted into the terminal slots
10
to pierce into the respective wires
2
-
5
′ for electrical connection while the upper ends of the terminals
8
are exposed in the terminal slots
10
.
However, the wires of each pair are arranged in different rows, especially, the wires
3
-
3
′ of the second pair are spaced apart in the different rows, making the wiring work difficult and requiring much labor in assembling the modular plug. The distance between the wires
3
and
3
′ is so large that the length of untwisted wires becomes large, making it difficult to minimize the crosstalk and/or attenuation.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a modular plug and a harnessed modular plug capable of not only simplifying the wiring work but also enhancing the electric characteristics.
According to the invention there is provided a modular plug comprising a guide plate having guide apertures capable of arranging at least first and second pairs of wires in at least upper and lower rows; a housing for receiving the guide plate; at least two pairs of terminals provided at positions corresponding to the guide apertures, wherein the guide apertures are arranged such that wires of the first pair are provided next to each other and wires of the second pair are spaced across the first pair in the same row.
It is preferred that the guide apertures are made such that the wires of the first pair are arranged in the same row. The wires of a third pair and the wires of a fourth pair are provided adjacent to a wire and the other wire of the second pair, respectively. The guide apertures are made such that an outside wire of the third pair, an outside wire of the fourth pair, and the wires of the second pair are provided one of the two rows while an inside wire of the third pair, an inside wire of the fourth pair, and the wires of the first pair are provided in the other row.
According to another aspect of the invention there is provided a harnessed modular plug comprises at least first and second pairs of wire; a guide plate having at least two pairs of guide apertures capable of arranging the wires of the first and second pairs in at least upper and lower rows; a housing for receiving the guide plate; at least two pairs of terminal provided in the housing at positions corresponding to the guide apertures, wherein the wires of the first pair are arranged next to each other while the wires of the second pair are spaced across the first pair in the same row. The guide apertures are made such that the wires of the first pair are arranged in the same row. The wires of a third pair and wires of a fourth pair are arranged adjacent to a wire and the other of the second pair, respectively. The guide apertures are made such that an outside wire of the third pair, an outside wire of the fourth pair, and the wires of the second pair are arranged in one of the two rows while an inside wire of the third pair, an inside wire of the fourth pair, and the wires of the first pair are arranged in the other row.
To assemble the harnessed modular plug, the front portions of four pairs of wires are untwisted and inserted into the guide apertures. The guide plate with the arranged wires is then fitted into the housing. Then, terminals are pushed into the housing into the wires so that the terminals are electrically connected to the wires. The distance between the wires and the length of untwisted portions are minimized so that not only insertion of the wires into the guide plate is made easy but also the electrical characteristics are improved.
REFERENCES:
patent: 5571035 (1996-11-01), Ferrill
patent: 5899770 (1999-05-01), Ezawa
patent: 6080007 (2000-06-01), Dupuis et al.
patent: 6123572 (2000-09-01), Ishii et al.
patent: 6193542 (2001-02-01), Marowsky et al.
patent: 6213809 (2001-04-01), Viklund
Hirose Electric Co. Ltd.
Kanesaka & Takeuchi
Ta Tho D.
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