Tool driving or impacting – Advance causing or controlling means – Driven flexible member causes advance
Patent
1977-01-06
1979-02-06
Hafer, Robert A.
Tool driving or impacting
Advance causing or controlling means
Driven flexible member causes advance
173151, 173 87, B23Q 5027
Patent
active
041379748
ABSTRACT:
A vertical drill rig is provided with a hydraulic crowd mechanism for crowding down a drive kelly having a rotating drilling tool supported from the lower end thereof.
The crowd mechanism includes a drum having first and second cables wound in opposite senses thereon. The drum is rotated by a hydraulic motor driven by pressure regulated fluid supplied by an accumulator charged with fluid received from a hydraulic pump. The cables couple the drive kelly to the rig such that, when the hydraulic motor rotates the drum in a given direction, the first cable is paid out to lower the drive kelly while the second cable is simultaneously taken up to crowd down the drive kelly relative to the rig. Such a construction and arrangement provides a substantially constant crowd down force on the rotating drilling tool irrespective of its vertical rate of penetration into the earth.
REFERENCES:
patent: 3717205 (1973-02-01), Wilderman
patent: 3719238 (1973-03-01), Campbell et al.
patent: 3830315 (1974-08-01), Love
patent: 3867989 (1975-02-01), Hisey et al.
patent: 3949818 (1976-04-01), Russell
patent: 3987856 (1976-10-01), Carl et al.
patent: 4044577 (1977-08-01), Horlacher
Hafer Robert A.
Smith International Inc.
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