US PATENT SUBCLASS 464 / 163
.~ Coupling between rotary drive table and axially movable 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.~ Coupling between rotary drive table and axially movable drill string {2}
164  DF  .~.~> Coupler includes endless belt or chain run engageable with drill string and moveable in direction of axial advance
165  DF  .~.~> Coupler includes antifriction rolling body engageable with drill string {1}

DEFINITION

Classification: 464/163

Coupling between rotary drive table and axially movable drill string:

(under subclass 162) Subject matter wherein one of said members is a rotating pipe used in an earth-boring operation, and the other of said members is a device positioned around the external circumference of the pipe for transmitting rotary torque to the pipe.

SEE OR SEARCH THIS CLASS, SUBCLASS:

18+, for a coupling facilitating relative movement between interconnected shafts in a drill string.

SEE OR SEARCH CLASS

173, Tool Driving or Impacting,

165+, for means to drive a tool about an axis and including a relatively fixed drive for an advancing tool.

175, Boring or Penetrating the Earth,

195, for a rotary drive table for a relatively advancing tool wherein significance is attributed to table structure.