Worm and collar drive drill rig

Details Worm and collar drive drill rig Worm and collar drive drill rig

E - Fixed Constructions

21

B

E21B 3/02 (2006.01)

Patent

CA 2585979

A drilling or service rig includes a worm drive disposed within and rotatably supported within a mast having one open side. The worm drive defines a helical groove, and a collar is disposed on the worm drive and engages the helical groove. Rotation of the worm drive causes movement of the collar upwards or downwards along the worm drive. The collar may support a block and top drive assembly.

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