Method for controlling a crane actuator

Details Method for controlling a crane actuator Method for controlling a crane actuator

2007-03-21

2010-10-26

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

C091S031000

Reexamination Certificate

active

07818967

ABSTRACT:
The invention relates to a method and an apparatus for controlling an actuator (7, 8) of a crane by control means (10) in a situation where the lifting power of the actuator (7, 8) of the crane is increased temporarily by an auxiliary valve arrangement (11). In the invention, control properties of the actuator (7, 8) are changed when the temporarily increased lifting power is applied to limit the speed of the actuator (7, 8).

REFERENCES:
patent: 3038449 (1962-06-01), Murphy et al.
patent: 4327549 (1982-05-01), Bianchetta et al.
patent: 4365429 (1982-12-01), Ecker et al.
patent: 4815614 (1989-03-01), Putkonen et al.
patent: 0 632 789 (1999-12-01), None

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