Hoist system for power shovels

Details Hoist system for power shovels Hoist system for power shovels

1973-09-14

1976-01-20

Spar, Robert J.

214135R, B66C 302

Patent

active

039332608

ABSTRACT:
A hoist system for a power shovel having a main frame, a boom connected at a lower end thereof to the main frame, a dipper handle pivotally connected to the boom and a dipper pivotally connected to the dipper handle, including means for varying the pitch of the dipper, generally including a hoist mechanism mounted on the main frame, a first hoist line operatively connected at one end thereof to the hoist mechanism, passing over a point on the boom and operatively connected at the opposite end thereof to the dipper handle, a second hoist line operatively connected at one end thereof to the hoist mechanism, passing over a point on the boom and operatively connected at the opposite end thereof to the dipper, and means for selectively varying the effective length of one of said hoist lines relative to the other thereof.

REFERENCES:
patent: 2084449 (1937-06-01), Neese
patent: 2498000 (1950-02-01), McLean
patent: 2985326 (1961-05-01), Lowell
patent: 3346129 (1967-10-01), Carter et al.
patent: 3403940 (1968-10-01), Clark
patent: 3436849 (1969-04-01), Haynes

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