HYDROMECHANICAL JACK Russian patent published in 1997 - IPC

FIELD: mechanical engineering; load-lifting machinery. SUBSTANCE: jack has support tube 1 accommodating load-lifting rod with piston 14. Rod is made in form of tube 13. Support for load in form of bowl 16 is coupled with rod by means of load-lifting screw. Rod is lifted by load lifting rack coupled with rod and engaging with load lifting lever 26 to which rocking force is applied. When lever 26 is turned and rod with pistons is moved, oil is sucked into under-piston space from reservoir through bypass check ball valve. Oil in under-piston space prevents downward movement of rod with load when lever is lowered and is not turned. EFFECT: enlarged operating capabilities. 4 cl, 6 dwg