Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Reexamination Certificate
2009-01-06
2011-12-20
Marcelo, Emmanu 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
Reexamination Certificate
active
08079569
ABSTRACT:
A cable drawworks for a drilling rig is provided having a three-phase AC electric motor controlled by a variable frequency drive control system. A primary drive transmission consisting of a chain and sprockets connects the motor to a drum shaft that passes through the hub of a cable drum such that the cable drum is rotatably mounted on the drum shaft. The drum shaft connects to a secondary drive transmission, attached to the frame via an oscillating plate assembly, that connects the drum shaft to the cable drum. Each end of the cable drum has a brake drum and a brake band wrapped around thereon. A brake actuating system is used to tighten the bands around each drum during braking conditions and includes an equalization linkage system between the brake bands resulting in equal braking forces being applied to each brake drum.
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Dinsmore & Shohl LLP
Marcelo Emmanu M
LandOfFree
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