Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent
1987-04-02
1989-04-18
Yost, Frank T.
Tool driving or impacting
Means to drive tool about an axis
Means to hold and relatively rotate sections of tool shaft
175423, 81 5733, E21B 1916
Patent
active
048218146
ABSTRACT:
A top head drive assembly for a drilling machine includes a wrench assembly used to make up and break out threaded connections. This wrench assembly is mounted for axial movement on rails of the top head drive assembly, and is positioned immediately under the quill. The top head drive assembly also includes a tubular support assembly which includes slip type inserts for supporting a string of down hole tubulars. This support assembly can be pivoted out of alignment with the drilling axis or can be locked in alignment with the drilling axis. A plurality of centering elements are mounted under the support assembly and are movable to center the upper end of a tubular for insertion into the tubular support assembly. Preferably, both the top head drive assembly load beam and the support beam of the support assembly are formed of box sections having converging side plates and internal diagonal brace plates which transmit downward forces on the beam into forces tending to cause the side plates to diverge. Divergence of the side plates is prevented by support plates which surround the beam.
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Haney Keith M.
Willis Clyde A.
501 W-N Apache Corporation
Wolfe James L.
Yost Frank T.
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