Drawworks for drilling rigs

Details Drawworks for drilling rigs Drawworks for drilling rigs

2006-06-16

2009-08-18

Marcelo, Emmanuel M (Department: 3654)

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

C254S358000, C254S365000

Reexamination Certificate

active

07575222

ABSTRACT:
A drawworks for drilling rigs having an improved dual brake system that divides the drill line load equally between the dual brakes, a more efficient braking action is realized by the provision of radial guide rollers positioned to urge the brake bands into concentric relation respective the brake drums which maximizes contact therebetween and results in more sensitive control of weight on bit. A chain and sprocket drive line includes flingers immersed in lub oil which effectively distributes lub oil throughout the drive line.

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patent: 3964692 (1976-06-01), Pendleton
patent: 4552340 (1985-11-01), Sheppard
patent: 4588167 (1986-05-01), Finzel
patent: 4751969 (1988-06-01), Klaeger
patent: 5425435 (1995-06-01), Gregory
patent: 5609229 (1997-03-01), Sell
patent: 5671912 (1997-09-01), Langford et al.

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