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Abstract

A downhole drilling subassembly for use with a pressurized fluid carrying drill string extending from a well head and having a portion down a bore hole. A first tubular housing is provided which is adapted to couple to the portion of the drill string in the bore hole. A second tubular housing is carried by the first tubular housing. Each of the housings has a generally circular cross-section and extends along a longitudinal axis. The second tubular housing is longitudinally movable relative to the first tubular housing between a first position at least partially retracted within the first tubular housing and a second position at least partially extended from the first tubular housing. An assembly responsive to moving the second tubular housing from its first position to its second position is carried by the first and second tubular housings for rotating the first and second tubular housings with respect to one another in the bore hole between first and second relative angular positions. The assembly includes a recess provided in one of the tubular housings and formed with a sidewall extending diagonal to the longitudinal axis and a pin carried by the other of the tubular housings and having a portion for travel in the recess.

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First Claim