GB587667A - Improvements relating to load measuring devices - Google Patents

Abstract

587,667. Dynamometers ; pressure gauges. POWER JETS, Ltd., and FIELDEN, G. B. R. March 15, 1943, No. 4233. [Class 106 (ii)] Apparatus for measuring a load, such as the thrust of an aero-engine, torque or weight, comprises a movable load-transmitting wall 2 forming part of a hydraulic pressure chamber 3, valve means 16 to control escape of fluid from the chamber in response to movement of the wall, means for maintaining a supply of fluid under pressure into the chamber and means for indicating the fluid pressure in the chamber. The load to be measured is applied by equally tensed cables to the wall 2 which is connected by a fabric annulus 2D to a fixed plate 4. The chamber 3 communicates with a pressure gauge 9A and is continuously fed with pressure fluid by a pump 8A. The chamber, via a pipe 11, feeds a variable-leak valve- 14, Fig. 3, urged more or less towards closed position through a multiplying lever 19 as the movable wall 2 is urged more or less by the load to be measured. According to the very slight adjustment of the valve 14, the pressure in the chamber 3 builds up or subsides to give an indication of the load on the pressure gauge 9A. An initial load comprising springs 21 and 19B renders the pressure gauge alive even under no external load. The weight of the wall 2 is supported from a fixed plate 6 by a wire 7. The movement of the wall is very small and is limited by stops 5A, 5B which may constitute electric contacts to give warning should the plate 2 move from floating position. The leaking fluid is returned to a reservoir by a pipe 16A, while air can be vented through a pipe 16B.