Electricity: conductors and insulators – Conduits – cables or conductors – Insulated
Patent
1994-02-22
1995-10-10
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Insulated
174 36, 174105R, 174131R, 348 84, H01B 708
Patent
active
054572886
ABSTRACT:
A dual push-cable for mechanically and electrically connecting a video camera head to a video circuit to permit the head to be pushed down the inside a pipe and negotiate turns in the pipe as the push cable is forced down the pipe while permitting the video circuit to power and receive video signals from the video camera head. The push-cable comprises an elongate resilient flexible push member, and elongate electrical and/or fiber optic signal transmitting cable, and a hinge joining the push member and the signal transmitting cable in a substantially parallel spaced apart side-by-side relationship. The push member may be a cylindrical rod formed of fiberglass impregnated with epoxy resin. The electrical signal transmitting cable may be armored tri-axial cable. A waterproof jacket of polyethylene, high density polyethylene, polypropylene or copolymer propylene may be extruded around both the rod and cable to form a flexible resilient hinge which extends along the push-cable between the fiberglass rod and the triaxial cable.
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