Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1984-10-31
1986-11-04
Watkins, Donald
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254392, 254900, E21B 1909
Patent
active
046206922
ABSTRACT:
Disclosed is a compensator applicable for use with a traveling block supported from a mast, derrick or the like by means of a crown block wherein the traveling block may be utilized for supporting objects. Two fluid pressure piston-and-cylinder assemblies are arrayed on opposite sides of a line of travel of the traveling block relative to the crown block so that a flexible line positioned about the sheaves of both blocks passes over a pulley supported by one fluid pressure assembly to one side of the line of travel and, on the other side, the flexible line passes over a pulley supported by the other fluid pressure assembly. One end of the flexible line may be anchored relative to the mast as a deadline while the line at its other end may be selectively retracted or payed out by a drawworks or the like fixed relative to the mast. The crown block is supported by flexible lines passing over pulleys also supported by the fluid pressure assemblies. With the drawworks holding the first flexible line fixed, the crown block and the traveling block may move in unison relative to the mast with proportional reciprocable movement on behalf of each of the fluid pressure assemblies while the traveling block remains stationary relative to the crown block. Operation of the drawworks to retract or pay out the line results in manipulation of the traveling block relative to the crown block regardless of movement of the two blocks relative to the mast.
REFERENCES:
patent: 3469820 (1969-09-01), Horton
patent: 3799505 (1974-03-01), Duncan
patent: 3804183 (1974-04-01), Duncan et al.
patent: 3841770 (1974-10-01), Childs
patent: 3877489 (1975-04-01), Louie et al.
patent: 3877680 (1975-04-01), Childs et al.
patent: 4025055 (1977-05-01), Strolenberg
patent: 4272059 (1981-06-01), Noerager et al.
Document entitled Crown Mounted Drill String Compensator by Maritime Hydraulics, undated.
Document identified as Crown Block Heave Compensator by Western Gear Corporation, undated.
Foreman Fred R.
Nayler Douglas W. J.
NL Industries Inc.
Watkins Donald
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