Excavating – Railway graders – Side former
Patent
1975-10-01
1976-11-09
Eickholt, E. H.
Excavating
Railway graders
Side former
214138R, 214141, 214770, E02F 502, B60P 104
Patent
active
039901610
ABSTRACT:
A crowd system for a power shovel having a front end assembly including a dipper mounted on a body, and means mounted on the body and operatively connected to the front end assembly for hoisting and lowering the dipper, comprising a mast pivotally connected at a lower end thereof to the body, at least one connecting link pivotally connected at opposite end thereof to the mast and the front end assembly, at least one support link pivotally connected at a lower end thereof to the body, a drive link pivotally connected at opposite end thereof to the mast and the support link, a gantry mounted on the body between the mast and the support link, at least one fluid actuated, piston and cylinder assembly pivotally connected at one end thereof to the gantry at a point elevated relative to a support platform of the body, and pivotally connected at the opposite end thereof to the drive link, and means for selectively supplying fluid under pressure to the opposite ends of the cylinder of the piston and cylinder assembly to correspondingly extend and retract such assembly.
REFERENCES:
patent: 2764306 (1956-09-01), Dorkins
patent: 2784855 (1957-03-01), Acker
patent: 2828038 (1958-03-01), Dorkins
patent: 3080076 (1963-03-01), Randall
patent: 3094229 (1963-06-01), Johnson et al.
patent: 3425574 (1969-02-01), Willgrubs et al.
patent: 3491906 (1970-01-01), Davidson
patent: 3501034 (1970-03-01), Baron
patent: 3608755 (1971-09-01), Solokhin et al.
patent: 3648863 (1972-03-01), Baron et al.
patent: 3856161 (1974-12-01), Baron
Eickholt E. H.
Marion Power Shovel Company, Inc.
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