Pitch stop assembly for power shovels

Details Pitch stop assembly for power shovels Pitch stop assembly for power shovels

1975-10-03

1978-04-25

Hoffman, Drayton E.

214142, E02F 332

Patent

active

040858545

ABSTRACT:
In a power shovel including a base unit; a support unit rotatably mounted on the base unit; a front end assembly including a stiffleg pivotally connected at a lower end thereof to the support unit, a dipper handle operatively connected to the stiffleg, a dipper pivotally connected to the dipper handle, a hoist frame pivotally connected to the stiffleg, and a hoist link pivotally connected at the ends thereof to the hoist frame and the dipper, the dipper handle, dipper, hoist link and hoist frame defining a four bar linkage; a crowd system operatively interconnecting the support unit and the front end assembly; a hoist system operatively interconnecting the support unit and the front end assembly; and control means mounted on the support means for operating the crowd and hoist systems to crowd, hoist, lower and retract the dipper, a pitch stop assembly comprising a collapsible tension member interconnecting the hoist link and dipper of the front end assembly for limiting the angular displacement of the dipper relative to the dipper handle when the dipper is caused to pitch upwardly.

REFERENCES:
patent: 1681282 (1928-08-01), Clutter
patent: 2776766 (1957-01-01), Sanderson
patent: 3501034 (1970-03-01), Baron
patent: 3648863 (1972-03-01), Baron et al.
patent: 3856161 (1974-12-01), Baron

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