Hydraulic apparatus

Details Hydraulic apparatus Hydraulic apparatus

1980-06-17

1983-09-27

Hershkovitz, Abraham

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Second path activated in response to pressure or flow in...

91 33, 91460, 91510, 91518, F15B 13042, F15B 1116

Patent

active

044062125

ABSTRACT:
Hydraulic apparatus (7), for use where a hydraulic actuator (42) is powered by a first hydraulic supply (40) or selectively and alternatively by a second hydraulic supply (41) independent of the first, which, when a fault occurs, will establish whether the actuator or the first hydraulic supply is at fault, and if it is the first hydraulic supply will isolate that supply and select the second hydraulic supply, but if it is the actuator will ensure that both supplies are isolated. Moreover, the apparatus will establish whether the actuator fault is tolerable and if it is, will select the second supply. By the arrangement described a second hydraulic supply is selected when the first fails, but if the actuator is at fault the second supply will only be selected if that fault is tolerable; if the second supply were to be selected if the actuator was intolerably faulty, failure of the second supply would follow in rapid succession.

REFERENCES:
patent: 2905191 (1959-09-01), Vander Kaay
patent: 3016708 (1962-01-01), Gordon
patent: 3260165 (1966-07-01), Larsen
patent: 3513751 (1970-05-01), Escobosa
patent: 3822551 (1974-07-01), Smith
patent: 4002027 (1977-01-01), Eley
patent: 4006663 (1977-02-01), Baatrup

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