Apparatus for establishing and maintaining electric continuity i

Details Apparatus for establishing and maintaining electric continuity i Apparatus for establishing and maintaining electric continuity i

1975-12-08

1977-09-27

Hunt, Brooks H.

Communications: electrical

Selective

Interrogation response

340 18CM, 175 50, 175104, 33312, G01V 140

Patent

active

040514560

ABSTRACT:
Apparatus for use in a rotary drill string to maintain electric continuity therethrough includes an externally insulated electric conductor tube having an electric cable mounted therein. The cable is telescopically movable with respect to the tube, and its lower end is in sliding contact with the interior of the tube. As drilling progresses, the cable may be extended relative to the tube, the sliding contact of the lower end of the cable maintaining electric continuity in the system.

REFERENCES:
patent: 2349225 (1944-05-01), Scherbatskoy et al.
patent: 2569390 (1951-09-01), Sewell
patent: 2650067 (1953-08-01), Martin
patent: 2936614 (1960-05-01), Godby
patent: 3285629 (1966-11-01), Cullen et al.
patent: 3789936 (1974-02-01), McCullough
patent: 3825079 (1974-07-01), Heilhecker
patent: 3926269 (1975-12-01), Cullen et al.

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