GB685087A - A solenoid-controlled hydraulic power mechanism - Google Patents

Abstract

685,087. Electrically-actuated valves. PARSONS, J. B. Nov. 7, 1950, No. 27184/50. Class 135 [Also in Group XXXV] A combined single-acting hydraulic piston and solenoidactuated control valve therefor for operating vehicle windows comprises a cylinder 10, Fig. 1, housing a valve assembly 21 and slidably mounting a piston 20 having a rod 17 operatively connected to the window. The valve assembly comprises a sleeve member 24 closed at its lower end by an inlet fitting 41 supplied by an electricallydriven pump, a spring-urged valve closure member 37 controlling a port 39 through the fitting 41 and a solenoid 32 surrounding the sleeve. The solenoid windings are protected against the water passing through the valve by a rubber sealing ring 28 disposed between washers 25, 26 secured to the sleeve. To raise the window, the pump and the solenoid are simultaneously energised whence the valve 37 is unseated and the piston 20 raised. To lower the windows, the solenoid only is energised and the water beneath the piston passes through the unseated valve 37 and a further valve (not shown), which, when the pump is inoperative, opens to connect the fitting 41 with the reservoir supplying the pump. In a modification, the valve member 37, Fig. 7, is urged upwardly towards closure on to a seating member 33b sealingly connected to the upper end of the sleeve 24. In this case any excess pressure within the cylinder is relieved by downward movement of the valve member against its spring when the solenoid is deenergised. Specification 653,203 is referred to.