GB482491A - Hydraulic pressure gauge - Google Patents

Abstract

482,491. Piston-and-spring pressure gauges. SCOVILL MANUFACTURING CO. July 23, 1937, No. 20455. Convention date, July 25, 1936. [Class 106 (ii)] Comprises a particular construction suitable particularly for measuring oil pressures. A housing 10 open at the top has a semi-cylindrical wall 11, parallel side walls 12 and a flat wall 13 connecting the side walls. The bottom 15 has an extension 16 and from near the bottom extends a part 17 internally screw-threaded. The fiat front wall 13 is provided with a longitudinal slot 18 terminating short of the base. Mounted in the housing is a tubular member 19 reduced at the lower end to pass with a close fit through the extension 16 the extreme end being screwthreaded to engage a screw cap 21 which is tightened up against packing to secure the tube 19 in place with its shoulder against the casing bottom. The cap has an opening 23 to suit the viscosity of the liquid the pressure of which is to be measured. The tube has mounted therein a plunger 24. A rod 25 is fixed to a washer 26 seating on the end of the tube and seated on the washer is the end of a butt-ended tube 28 which is flanged at the open end. A spring 27 surrounds the tube 28 seating at the bottom in an annular member with a Z-section rim between which and the flange 30 is located the bottom of a cup member 31. An annular nut 33 screws into the open end of the housing and serves to set the spring under pressure. An indicator 36 part with the cup 31 extends through the slot 18 and moves over a scale of pressures on an indicator plate 34 secured to the housing. The tube 19 is hexagonal in section on the outside and liquid seeping past the plunger 24 can escape over the top and through the clearance to a drain pipe connected at 17.