Power plants – Pressure fluid source and motor – Cyclically operable reciprocating or oscillating motor or...
Patent
1987-06-16
1989-06-06
Look, Edward K.
Power plants
Pressure fluid source and motor
Cyclically operable reciprocating or oscillating motor or...
60468, 91420, 91445, 91446, 91461, F16D 3102
Patent
active
048359661
ABSTRACT:
A control switching arrangement for a hydraulic power lift control system comprises a power lift control valve which is controlled via control lines in a low pressure section. The main hydraulic section is controlled by the said control valve via a check valve which is hydraulically openable, at least for carrying out lowering movement by the power lift. The check valve is opened via the said control valve itself, which furnishes the switching line a pressure generally equal to the circulation pressure of the main hydraulic section. Further, means are provided whereby, in the switching state corresponding to lowering movement of the power lift, the circulation pressure of the main hydraulic section can be increased. With this control system the low pressure control section is simplified, and energy losses in the control system are kept as low as possible.
REFERENCES:
patent: 3623509 (1971-11-01), Sesseler et al.
patent: 3960059 (1976-06-01), Schexnayder
patent: 4179889 (1979-12-01), Gondek
patent: 4292884 (1981-10-01), Schumacher et al.
patent: 4442912 (1984-04-01), Vette
patent: 4531449 (1985-07-01), Reith
Kauss Wolfgang
Schulte Heinz
Look Edward K.
Mannesmann Rexroth GmbH
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