GB556761A - Improvements in or relating to liquid pressure remote control systems - Google Patents

Abstract

556,761. Hydraulic remote control systems. BENDIX AVIATION CORPORATION. April 17, 1942, No. 5147. Convention date, April 17, 1941. [Class 69 (ii)] In a hydraulic remote control system which is especially applicable for controlling landing carriages of aeroplanes an additional liquid reservoir 90 is provided as well as the main reservoir C, and in addition to the main pump P a hand pump is provided which may be supplied from the reservoir C and serve to actuate the motor 10 in both directions, or the hand pump may be supplied from the reservoir 90 and deliver fluid through a normally spring-closed valve 25 and act to move the motor in one direction only namely that in which the carriage is to be lowered. A selector valve with lands 51, 52, 53 is actuated by a lever 61 to control the operation of the hand pump and as shown in Fig. 1 is set so that the hand pump is connected to the reservoir C. In Fig. 3, the valve is set so that this pump receives liquid from a pipe 87 and discharges it via pipe 89 to the valve 25 and motor 10. The hand pump is operated by a lever 62 and link 64 and the plunger 58 is fitted with a piston 54 having an aperture which is closed by a spring- valve 57 when the piston is moved towards the right, but opened to permit liquid to pass through when moved to the left. The entry of liquid from the selector valve is controlled by a valve 71 controlled by a spring 72 and this valve opens when the piston is moving to the right and closes on leftward movement. Non-return valves 23, 24 prevent liquid from the pump P entering pump 54 and vice versa.