Motors: expansible chamber type – Relatively movable working members with one having motive... – Means connecting working members actuates common part...
Patent
1985-04-23
1987-10-13
Hershkovitz, Abraham
Motors: expansible chamber type
Relatively movable working members with one having motive...
Means connecting working members actuates common part...
91368, 91509, 91523, 92146, F01L 1500
Patent
active
046990437
ABSTRACT:
A servoactuator unit to operate flight-control mechanisms, in particular for control of the position of the oscillating plate which adjusts the cyclic pitch and collective pitch of helicopter rotors, in which two pairs of hydraulic actuators are used, connected together in parallel, arranged with their axes parallel and close together like the diagonals of a quadrilateral, their rods connected together at their end and acting on the said oscillating plate and the cylinders also being connected together at the back. Each pair of actuators is powered, through a servovalve, by an independent hydraulic circuit so as to enable operation even in the event of one of the pairs breaking down, with symmetrical stress being placed on the pair of actuators during operation.
REFERENCES:
patent: 3831493 (1974-08-01), Wanger
patent: 3915064 (1975-01-01), Dancs
patent: 3965798 (1976-06-01), Estlick
patent: 4082115 (1978-04-01), Gibb
patent: 4157066 (1979-06-01), Pretty
patent: 4300352 (1981-11-01), Williams
Dubno Herbert
Hershkovitz Abraham
Magnaghi Oleodinamica S.p.A.
Ross Karl F.
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