Electrical connectors – Including or for use with coaxial cable
Reexamination Certificate
1999-10-13
2001-02-06
Donovan, Lincoln (Department: 2832)
Electrical connectors
Including or for use with coaxial cable
C439S582000
Reexamination Certificate
active
06183298
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to connectors for terminating the ends of coaxial cables, and more specifically, to a coaxial cable connector of the general type that grips the center conductor and the outer sheath of the coaxial cable as the connector is assembled onto the end of the coaxial cable.
2. Description of the Related Art
In cable connectors of this kind it is known to use axially displaceable components with conical formations cooperating to provide the radial compression of connecting parts to provide the electrical and mechanical connections between the connector and the coaxial cable. The axial displacement of parts in the connector is effected by a bushing provided with a thread which is screwed onto a corresponding thread provided in the main body of the connector. In such cable connectors it is known to provide a non-rotational locking arrangement between the main body of the connector and a ferrule for engaging the outer conductor or screen of the coaxial cable and/or the outer insulating jacket of the coaxial cable.
SUMMARY OF THE INVENTION
It is the object of the present invention, to provide a cable connector of the above kind, with an improved locking arrangement. This object is achieved by causing an end of the ferrule to contact, and become non-rotatably engaged with, and end of the main body to form a locking engagement therebetween as the collar is threaded onto the main body. With this arrangement the ferrule is prevented from rotating by simple engagement between conical surfaces on the ferrule and the main body of the connector. A further advantage with this construction is that the electrical contact between the ferrule and the main body of the connector is achieved circumferentially continuous along the conical engagement surfaces, whereby the shielding effectiveness is improved and the intermodulation distortion, return loss and insertion loss are reduced compared to similar connectors of traditional construction.
Preferably, one end of the main body includes a first conical surface, and one end of the ferrule includes a second conical surface; the first and second conical surfaces are brought into locking engagement as the collar is threadedly engaged with the main body. An inner bushing is preferably rotatably disposed within the second end of the collar between the second end of the collar and the second end of the ferrule; this inner bushing engages an end of the ferrule opposite the main body, and advances the ferrule into engagement with the main body as the collar is threadedly engaged with the main body. A friction reducing disc is advantageously disposed between the collar and the inner bushing for allowing the inner bushing to rotate freely relative to the collar. A first O-ring is disposed between the main body and the first end of the collar, and a second O-ring is disposed between the second end of the collar and the coaxial cable for providing a moisture-tight connector. The internal threads of the collar and the external threads of the main body are preferably provided as multiple-start threads, whereby the assembly time for as a connector with a coaxial cable will be substantially reduced, the final mounting position being reached with only a few rotations of the bushing and the threading is almost instantanously brought into engagement whereas the single thread of the prior art, having only one start, may have to be rotated up to approximately 360° before it is brought into initial engagement.
REFERENCES:
patent: 3977752 (1976-08-01), Freitag
patent: 5352134 (1994-10-01), Jacobsen et al.
patent: 5360239 (1994-11-01), Klementich
patent: 5542861 (1996-08-01), Anhalt et al.
patent: 5620339 (1997-04-01), Gray et al.
patent: 5651698 (1997-07-01), Locati et al.
patent: 33828953 (1990-03-01), None
patent: 1416133 (1995-12-01), None
Cahill Sutton & Thomas P.L.C.
Donovan Lincoln
Gilbert Engineering Co., Inc.
Lee Kyung S.
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