GB730186A - Feel simulator system for aircraft - Google Patents

Abstract

730,186. Fluid-actuated valves. DUNLOP RUBBER CO., Ltd., TREVASKIS, H. W., and DUNLOP RIM & WHEEL CO., Ltd. March 10, 1953 [April 1, 1952], No. 8231/52. Class 135. [Also in Group XXXIII] The control and valve mechanisms used in a feel simulator for aircraft powered controls (see Group XXXIII) are shown in Fig. 2 wherein the chamber 21 is connected by port 19 to the aircraft pitot head. The diaphragm 21 communicates the force acting on it to lever 29 through the pointed end 28 of a rod 24 fast with the diaphragm. Lever 29 abuts two rollers 30, 31 slidable laterally in a slot in their carriage 32, which rollers 30, 31 slidable laterally in a slot in their carriage 32, which rollers transmit force from lever 29 to the end 38b of a lever 38 pivoted at end 38a. By rotating the knob 35, carriage 32 moves parallel to the levers, and varies the mechanical advantage between them. In the valve mechanism 4, the inlet from a source of fluid-pressure 5 is controlled by ball 44 mounted in a slider 50, an extension of which (see Fig. 3, not shown) abuts the exhaust valve seat 48 slidable in a channel between the exhaust chamber 41 and the inlet chamber 42. Slider 50 is biased by spring 46 to close the inlet, the bias being adjustable by screw 52. When lever 38 is rocked, it depresses plunger 54 and thus the exhaust valve 53, its seat 48 and slider 50, opening the inlet valve. Fluid pressure in the chamber will increase until it is sufficient to raise exhaust valve 53 against the force of lever 38, enabling the inlet valve to close. When pressure from the pitot head is reduced, the exhaust valve is unseated and liquid flows to the reservoir, reducing the pressure until the exhaust valve closes again. A permanent spring- bias acts on lever 38. The channel 7 connects the pressure chamber with a ram and cylinder mechanism providing the feel.