04423645 is referenced by 2 patents and cites 18 patents.

A spinner for turning a well drilling kelly or the like and including a member connectible to the kelly to drive it rotatively, a reversible motor, and a drive between the rotor of the motor and said member including two gears for driving the member in opposite directions respectively, with the two gears being mounted by threaded connections for axial movement between active driving positions and retracted non-driving positions. Rotation of the motor acts by virtue of a threaded connection or connections to shift one of the gears to its active driving position to turn the driven member in a first direction, while retaining the second of the gears in its retracted position. Rotation of the motor in the opposite direction acts to shift the second of the gears to active position driving the member in its second direction while retracting the first of the gears to its inactive position.

Title
Pipe spinner
Application Number
6/272328
Publication Number
4423645
Application Date
June 10, 1981
Publication Date
January 3, 1984
Inventor
Joseph A R Picard
Fountain Valley
CA, US
Padmasiri D Seneviratne
Fullerton
CA, US
Roderick K Abbott
Villa Park
CA, US
Agent
William P Green
Assignee
Varco International
CA, US
IPC
F16H 57/00
F16H 3/22
F16H 5/52
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