HYDRAULIC CYLINDER Russian patent published in 1996 - IPC

FIELD: mechanical engineering; drives of press-forming plants with automatic working cycle. SUBSTANCE: idle stroke: working liquid is delivered through feed channel and channels in plunger and valve into working space with simultaneous delivery of liquid into piston space and extension of booster piston at speed determined by setting of restrictor; working stroke: working space is isolated from source of working liquid, piston and booster plunger are moved; return o members in initial position. EFFECT: simplified design of control system provided by arrangement of distributing members in hydraulic cylinder members. 2 cl, 1 dwg