CYLINDER PISTON UNIT Russian patent published in 2019 - IPC F15B15/16 

FIELD: transportation.

SUBSTANCE: unit and hydraulic system are intended for lifting platform. Unit comprises first, outer, hydraulic cylinder (2) with first piston (6) arranged therein with possibility of longitudinal displacement, sealed relative to inner wall of first hydraulic cylinder (2), wherein on this first piston (6) there is a second, internal, hydraulic cylinder (3), in which second piston (9) sealed relative to the inner wall of the second hydraulic cylinder (3) is arranged with possibility of longitudinal displacement, and on which rod (10) is installed, wherein rod (10) is connected to end (4) of external hydraulic cylinder (2) by its end remote from second piston (9). Hydraulically effective surface of first piston (6) on its side facing the second hydraulic cylinder (3) corresponds to the hydraulically effective surface of second piston (9) on its side facing away from rod (10). In the hydraulic system the first and the second hydraulic cylinders of both piston units (1a, 1b) are hydraulically interconnected cross-wise, due to which every second hydraulic cylinder acts as the finishing cylinder of the first cylinder of the other piston unit in the "master / slave" type system.

EFFECT: space saving for use, in particular, in "master / slave" type system.

10 cl, 6 dwg