Hoist pull down system for blast hole drill

Details Hoist pull down system for blast hole drill Hoist pull down system for blast hole drill

E - Fixed Constructions

21

B

255/32

E21B 19/084 (2006.01) E21B 15/00 (2006.01)

Patent

CA 1191506

HOIST PULL DOWN SYSTEM FOR BLAST HOLE DRILL Abstract of the Disclosure A chain-type hoist pull down system for a large blast hole drilling rig is provided which includes auxiliary tensioning means to increase the tension of the pull down chain during selected operating modes. In the preferred embodiment the auxiliary tensioning means comprises a single acting hydraulic cylinder suspended between an idler sprocket and a spring loaded resilient mounting. A simple circuit for automatically actuating the auxiliary tensioning means at the required time is also provided.

414213

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