Patent ID: 7527245
Filing Date: 2009-05-05
Classification: B66D,E21B

Abstract:
1. A cable drawworks for a drilling rig, comprising: (a) a frame adapted for mounting on a drilling rig, the frame having a floor member and two opposing sidewall members; (b) motor means for operating a cable drum mounted on said frame, said motor means having a drive shaft; (c) a drum shaft having first and second ends, each of said ends rotatably mounted on a sidewall of said frame; (d) primary drive means for rotatably coupling said drive shaft to the first end of said drum shaft; (e) said cable drum rotatably mounted on said drum shaft, said cable drum located between said first and second ends on said drum shaft; (f) secondary drive means for rotatably coupling the second end of said drum shaft to said cable drum; (g) brake means for braking the rotation of said cable drum, wherein said brake means comprises at least one band brake capable of braking said cable drum; and (h) motor control means for operating said motor means whereby said drawworks is capable of reeling in or paying out a cable attached to said cable drum.