US PATENT SUBCLASS 464 / 164
.~.~ Coupler includes endless belt or chain run engageable with drill string and moveable in direction of axial advance

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}
164.~.~ Coupler includes endless belt or chain run engageable with drill string and moveable in direction of axial advance

DEFINITION

Classification: 464/164

Coupler includes endless belt or chain run engageable with drill string and movable in direction of axial advance:

(under subclass 163) Subject matter wherein said coupling means comprises a closed loop belt or chain entrained for movement around and between spaced rotational axes, and wherein one run of said belt or chain engages and moves with said pipe along the rotational axis of the pipe.