Multi-stage double-acting extendible and contractible shaft driv

Details Multi-stage double-acting extendible and contractible shaft driv Multi-stage double-acting extendible and contractible shaft driv

1973-11-21

1976-05-18

Purser, Ernest R.

Tool driving or impacting

Advance causing or controlling means

Tool advances relative to drive

64 23, 92 53, 175321, 175381, E21B 302

Patent

active

039571254

ABSTRACT:
A uniquely integrated arrangement of concentric tubes in combination with concentric pistons and special interconnecting fluid pressure passages therein, said component members cooperating in a manner as to permit extreme compound extension or retraction, while special cross-section configuration allows efficient transmission of axial torque energy without slippage between collinear members, so that when driven as a Kelly drive for earth drilling the torque is transmitted to a drilling auger.

REFERENCES:
patent: 2066794 (1937-01-01), Miller
patent: 2634950 (1953-04-01), Allen
patent: 2741461 (1956-04-01), Joy
patent: 2783744 (1957-03-01), Tennis
patent: 2847188 (1958-08-01), Wiltse
patent: 3128674 (1964-04-01), Gancher et al.
patent: 3768578 (1973-10-01), Russell

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