Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1986-11-07
1988-01-05
Look, Edward K.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60484, 60486, 60493, 91461, 91523, 212196, 212198, F16D 3102
Patent
active
047167289
ABSTRACT:
A hydraulic drive system for a counterweight dolly in a counterbalance type crane having a crane body provided with a lower travelling structure an upper swivelling structure and the counterweight dolly connected to the rear portion of the upper swivelling structure through a connecting member, characterized by including a swivelling hydraulic motor for swivelling the upper swivelling structure of the crane body; a swivelling control valve for controlling the pressure of hydraulic oil to be fed to the swivelling hydraulic motor; a hydraulic circuit for swivelling operation which controls the amount of operation of the swivelling control valve; a hydraulic motor for the counterweight dolly which drives each wheel of the dolly; a dolly control valve for controlling the pressure of hydraulic oil to be fed to the hydraulic motor for the counterweight dolly; and a control circuit for actuating the dolly control valve in accordance with an operational pressure of the hydraulic circuit for swivelling operation and thereby controlling the driving pressure for the hydraulic motor for the dolly under a pressure proportional to the driving pressure for the swivelling hydraulic motor.
REFERENCES:
patent: 3954046 (1976-05-01), Stillhard
patent: 4165613 (1979-08-01), Bernhoft et al.
patent: 4362018 (1982-12-01), Torii
patent: 4540097 (1985-09-01), Wadsworth et al.
Kabushiki Kaisha Kobe Seiko Sho
Look Edward K.
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