Safety device for a hydraulic regulating device for an aircraft part to be moved

摘要

A hydraulic regulating device of an aircraft has two independent fluid circuits, to which a separate piston/cylinder unit is allocated in each case as an actuator for one and the same part to be moved. Fluid under pressure is admitted to this unit in accordance with the position of an electromechanically actuated control slide. The control slide sits in a sleeve arrangement consisting of two sleeves spaced apart in the longitudinal direction. In normal operation each sleeve is held in a fixed position by an interlocking means. If the control slide jams in the one or the other sleeve, the relevant interlocking means is permanently released by instantaneously overcoming a predetermined force, so that the relevant sleeve together with the control slide is displaceable by a relatively small expenditure of force, and the fluid circuit allocated to the other sleeve is from now on the sole active component of the regulating device. At the same time as the release of the interlocking means, a bypass valve short- circuits the piston/cylinder unit of the circuit which is no longer active, so that this circuit sets no inhibiting forces against the regulating movements of the other circuit.