Wells – With electrical means – Electrical motor
Patent
1991-02-26
1993-02-09
Dang, Hoang C.
Wells
With electrical means
Electrical motor
166 50, 166 665, 166104, E21B 2300
Patent
active
051846764
ABSTRACT:
A self-propelled powered apparatus for traveling along a tubular member includes power driven wheels for propelling the apparatus, a biasing means for biasing the driven wheels into contact with the inner surface of the tubular member, and a retracting means for retracting the driven wheels from the driving position so that the apparatus can be withdrawn from the tubular member. The retracting means also include means to automatically retract the driven wheels from the driving position when the power to the apparatus is cut-off.
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Connell William F.
Graham Gordon A.
Pasznicki William V.
Pratley Kenneth V.
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