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

1981-12-02

1984-03-06

Meister, James M.

Tool driving or impacting

Advance causing or controlling means

Driven flexible member causes advance

474110, E21B 1500, E21B 1908

Patent

active

044348606

ABSTRACT:
A chain-type hoist pull down system for a large blast hole drilling rig is provided which includes an auxiliary tensioning mechanism to increase the tension of the pull down chain during selected operating modes. In the preferred embodiment the auxiliary tensioning mechanism 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 mechanism at the required time is also provided.

REFERENCES:
patent: 3867989 (1975-02-01), Hisey et al.
"Blast Hole Drill, Descriptive Information," Marion Power Shovel, publication Cl-930.
"GD-120 (Blasthole Drill) Maintenance Instruction," Gardner-Denver Co., Bulletin 29-259-First Edition.
Parts Catalog BE 6074, 6166, Bucyrus-Erie Co.

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