Top head drive assembly for earth drilling machine and...

Details Top head drive assembly for earth drilling machine and... Top head drive assembly for earth drilling machine and...

E - Fixed Constructions

21

B

255/14, 255/30

E21B 19/16 (2006.01) E21B 3/02 (2006.01) E21B 19/07 (2006.01) E21B 19/10 (2006.01)

Patent

CA 1327195

ABSTRACT OF THE DISCLOSURE 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 ele- ments are mounted under the support assembly and are movable to center the upper end of a tubular for inser- tion 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.

563017

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