Patent ID: 6851349

Claim:
A multi-stage telescopic cylinder comprising: an outer cylinder having an open end, a closed end and at least one radial passage disposed through the wall of said outer cylinder in communication with the interior of said outer cylinder and adapted for connection with a source of pressurized fluid; multi-telescoping stages, including a plurality of piston/sleeve assemblies of successively differing diameters, concentrically movably mounted within said outer cylinder for reciprocal longitudinal, sealed movement, said plurality of piston/sleeve assemblies including an innermost plunger assembly, and at least one intermediate piston/sleeve assembly concentrically mounted intermediate said outer cylinder and said innermost plunger assembly, said at least one intermediate piston/sleeve assembly being defined by an sleeve having an piston mounted on one end, said innermost plunger assembly having a hollow sleeve with a cylindrical piston closing one end thereof, said cylindrical piston having a substantially radially disposed passage extending toward the longitudinal axis of said cylindrical piston; and successive internal fluid passages taking the form of a radially disposed hole formed in the walls of said pistons in fluid communication with said at least one passage in said outer cylinder.