COMBINATION-ACTION TELESCOPIC HYDRAULIC CYLINDER Russian patent published in 2000 - IPC

FIELD: materials handling machinery; shipbuilding, mechanical engineering and other industries. SUBSTANCE: invention is designed to create power positive-displacement hydraulic mechanisms with rectilinear reciprocating combination action. Hydraulic cylinder has telescopic set of double-acting stage with piston and single-acting stages with plunger installed to form direct pressure and backpressure spaces. Plunger space of single- acting stage is formed by walls and end faces of sleeve-piston of double-acting stage Its piston has solid end face wall at side of direct pressure space. Plunger space is connected with backpressure space by means of channel made in wall of rod of double- acting stage. Plunger space is connected with backpressure space to form united space. EFFECT: possibility of multiple retraction and extension of single-acting stage at double-acting stage extended into extreme position. 4 dwg