Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Reexamination Certificate
2002-06-26
2003-10-28
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
C174S034000, C174S068300, C439S098000, C439S616000
Reexamination Certificate
active
06639146
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cable connector for fastening a cable to a metal box and, more particularly, to such a cable connector, which effectively eliminates electromagnetic interference.
2. Description of the Related Art
When arranging electronic lines, transmission lines
71
are surrounded by an inner insulator
72
inside a tube of electrically conducting material
73
held in place by an outer insulator
70
(see FIG.
1
A). Metal box and cable connector means are commonly used to connect cables of the aforesaid design. In order to eliminate electromagnetic interference and noises, a conducting member
600
is used (see
FIG. 1B
) is used with the cable connector. The conducting member
600
comprises a plurality of outwardly protruded stop portions
6003
formed of a part of the peripheral wall by stamping, a plurality of retaining arms
6001
respectively obliquely extended from the top end thereof toward the cable
70
. The retaining arms
6001
each have a free end terminating in a curved contact portion
6002
disposed in contact with the tube of electrically conducting material
73
of the cable
70
. During installation, the conducting member
600
is inserted into one end of the metal casing
100
of the cable connector, a flexible packing barrel
300
and a clamping ring
300
are inserted into the other end of the metal casing
100
(see FIG.
1
), and then a packing nut
400
is threaded onto the metal casing
100
to compress the clamping ring
300
against the flexible packing barrel
300
and the cable
70
. Further, a gasket ring
500
is fastened to the metal casing
100
to seal the gap between the metal casing
100
and the metal box (not shown) in which the cable connector is installed. This design of cable connector is still not satisfactory in function. The drawback of this design of cable connector is outlined hereinafter.
1. The conducting member
600
is complicated and expensive to manufacture, and the bulky design of the conducting member
600
requires much installation space. When in use, no means is provided to hold down the connection between the conducting member
600
and the metal casing
100
, and a false contact between the conducting member
600
and the metal casing
100
results in poor EMI (electromagnetic interference) protection.
2. When pulling the cable
70
out of the connector for a replacement, the protruded stop portions
6003
and/or the retaining arms
6001
may be forced to break.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide an EMI protective cable connector, which eliminates the aforesaid problems. It is the main object of the present invention to provide an EMI protective cable connector, which effectively eliminates electromagnetic interference. It is another object of the present invention to provide an EMI protective cable connector, which is durable in use. According to one aspect of the present invention, the EMI protective cable connector comprises a metal casing fastened to a metal box by a gasket ring and a lock nut to hold a cable, a flexible packing barrel and a plastic clamping ring mounted in one end of the metal casing, a packing nut fastened to one end of the metal casing to compress the plastic clamping ring and the flexible packing barrel against the outer insulator of the cable, and a metal conducting plate stopped between a step inside the metal casing and one end of the flexible packing barrel and adapted for transmitting electromagnetic waves from the cable to the metal casing and then the metal box. The metal conducting plate comprises inwardly radially extended springy retaining arms, each springy retaining arm having a free end terminating in a curved contact portion disposed in contact with the tube of electrically conducting material of the cable. According to another aspect of the present invention, the curved contact portions of the springy retaining arms of the metal conducting plate are alternatively curved in reversed directions.
REFERENCES:
patent: 4547623 (1985-10-01), Van Brunt et al.
patent: 4896000 (1990-01-01), Procter et al.
patent: 5371819 (1994-12-01), Szegda
patent: 5410102 (1995-04-01), Guiol et al.
patent: 6376766 (2002-04-01), Bartholoma et al.
AVC Industrial Corp.
Oliva Carmelo
Pro-Techtor Inter-national Services
Reichard Dean A.
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