US PATENT SUBCLASS 464 / 165
.~.~ Coupler includes antifriction rolling body engageable with drill string

Current as of: June, 1999
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464 /   HD   ROTARY SHAFTS, GUDGEONS, HOUSINGS, AND FLEXIBLE COUPLINGS FOR ROTARY SHAFTS

162  DF  COUPLING FACILITATES RELATIVE AXIAL MOTION BETWEEN COUPLED MEMBERS {3}
163  DF  .~ Coupling between rotary drive table and axially movable drill string {2}
165.~.~ Coupler includes antifriction rolling body engageable with drill string {1}
166  DF  .~.~.~> With screw device for adjusting radial position of rolling body

DEFINITION

Classification: 464/165

Coupler includes antifriction rolling body engageable with drill string:

(under subclass 163) Subject matter wherein said coupling means includes a body rotatable about its own axis and engaging the external periphery of the pipe for facilitating axial movement of the pipe.