Boom crane centering

Details Boom crane centering Boom crane centering

1987-03-30

1988-11-08

Look, Edward K.

Power plants

Pressure fluid source and motor

Methods of operation

60494, 91437, 91461, F16D 3100, F16D 3102

Patent

active

047826622

ABSTRACT:
The present invention incorporates a free swing system into the hydraulic flow system of a boom crane in order to permit an operator to control the boom crane during the centering operation, which occurs immediately before and during the hoisting of a load. The free-swing system is incorporated into the hydraulic flow system between the swing control valve and the hydraulic swing motor and operates by "bleeding-off" a portion of the hydraulic fluid being pumped to or by the hydraulic swing motor so as to greatly reduce or control the rotational speed of the hydraulic swing motor.

REFERENCES:
patent: 3303647 (1967-02-01), Futamata
patent: 3473442 (1969-10-01), Farmer et al.
patent: 3994133 (1976-11-01), Pfeil et al.
patent: 3999386 (1976-12-01), Crull et al.
patent: 4194365 (1980-03-01), Stoufflet et al.
patent: 4293229 (1981-10-01), Heyl
patent: 4475442 (1984-10-01), Breeden
patent: 4479349 (1984-10-01), Westveer
patent: 4653271 (1987-03-01), Reeves et al.

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