LOAD PLATFORM JACKING-UP AND LEVELLING HYDRAULIC DRIVE Russian patent published in 1998 - IPC

FIELD: transport engineering; civil engineering; different branches of industries; lifting mechanism. SUBSTANCE: hydraulic drive has hydraulic supports installed on platform body, reciprocating-action meter, reversible distributor and supply source connected by main lines. Controlled check valves are connected by their rod spaces to hydraulic support main lines. Above indicated rod spaces are connected through additional distributor with supply source and tank. Second piston space is made in each check valve. Drive is furnished with levelling up spools whose inlet holes are coupled with supply source, and drain holes, with additional distributor. Outlet hole of each spool is connected with first or second piston space of two controlled check valves whose rod spaces are connected with corresponding adjacent hydraulic supports. EFFECT: improved reliability of hydraulic drive and accuracy of levelling up. 2 cl, 3 dwg