Patent ID: 7243907

Claim:
A vehicle-mounted hydro-electric jack system comprising of: a) two conventional double direction hydraulic jack comprising a cylinder ( 37 ) in which a jack rod ( 32 ) provided with a piston at one end, is slidably fitted, a plate ( 31 ) fixed to the one end of said jack rod, a plate ( 39 ) provided at one end of the cylinder ( 37 ) to fix the said jack under the body of vehicle, plurality of adaptors ( 35 , 38 ) and pipes ( 28 , 29 ) for connecting the said jack to a control valve unit herein described; b) a control valve hydraulically connected to said hydraulic jacks and comprising a valve body ( 1 ), two push rod plungers ( 2 ) slidably fitted in two identical longitudinal holes ( 103 , 104 ) equidistant from the central line of the said valve body, the said valve body having inlet port ( 21 ) outlet port ( 22 ), the said holes having identical internal grooves ( 105 – 113 ), the said plungers having identical external grooves ( 80 , 81 , 82 ), the said grooves being adapted so as to cause extension of said hydraulic jack when said plunger is pulled out and cause retraction of said hydraulic jack when said plunger is pushed in; c) safety means comprising a push button ( 48 ), a coil unit ( 49 ) herein described and a valve ( 9 ), the said means being operative only when hand brake is applied; d) an electrical actuation and control means comprising two way push button ( 47 ) electrically connected to a motor ( 40 ) fitted with worm gear ( 41 ), the said worm gear having an integral pinion ( 77 ) which drives a gear sector ( 44 ), the said gear sector being made of non metallic materials selected from Bakelite or fibre glass laminate on which copper sheet is affixed, the said gear sector provided to selectively make or break electrical circuit between pins ( 71 to 76 ) provided on plate ( 45 ), the said gear mounted on a center pin ( 43 ) fixed on a lug ( 89 ) which engages with a groove ( 90 ) in one end of said push rod plunger, the said pins being electrically connected to plurality of relays that are electrically connected to the terminals of said motor ( 40 ); e) a coil unit comprising a coil ( 49 ) to which a plate ( 87 ) is bolted, the coil being fitted with a spring ( 52 ) which is slidably mounted over a piston ( 53 ), the said piston having a bolt means ( 54 ) at one end which is fixed to a flat plate ( 55 ), the flat plate being fixed to the said valve body with a bolt means ( 56 ).