Traversing hoists – With haul-in line
Patent
1985-06-20
1986-07-08
Blix, Trygve M.
Traversing hoists
With haul-in line
212151, 212159, B66C 1318
Patent
active
045988293
ABSTRACT:
A hydraulic circuit for a crane having both lift and boom hoist pumps driven by the same engine with appropriate control valves to independently control the lift hooks and the boom angle. An unloading valve is interposed in the boom hoise circuit and dumps the boom hoise pump directly to reservoir when the pressure in the left pump circuit becomes excessive. A boom limit valve, actuated as the boom reaches both upper and lower limits, also causes the unloading valve to dump the boom hoise pump to reservoir.
REFERENCES:
patent: 2030529 (1936-02-01), Nash
patent: 3094221 (1963-06-01), Galuska
patent: 3334756 (1967-08-01), Whitmire
patent: 3561610 (1971-02-01), Buckert et al.
patent: 3606049 (1971-09-01), Gordon
patent: 3814265 (1974-06-01), Miller
patent: 4157736 (1979-06-01), Carbert
patent: 4236864 (1980-12-01), Couture et al.
patent: 4344497 (1982-08-01), Rathi et al.
Berger Gerald P.
Willard David L.
Young Rickie A.
Blix Trygve M.
FMC Corporation
Johnson R. B.
Kamp Ronald C.
Megley Richard B.
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