Patent ID: 7770868

Claim:
A telescopic lifting assembly which comprises: a first linear drive assembly which includes at least one first hydraulic piston/cylinder device having a piston rod that is extendable from a cylinder in a first direction, a second linear drive assembly which includes at least one second hydraulic piston/cylinder device having a piston rod which is extendable from a cylinder in a second direction, said second direction being opposite said first direction, and an elongated coupling element, said elongated coupling element having opposite first and second ends, said elongated coupling element defining at least one first guide surface at said first end through which the cylinder of said first linear drive assembly slidingly extends and at least one second guide surface at said second end thereof through which the cylinder of said second linear drive assembly slidingly extends, first attachment means for fixedly attaching the piston rod of said first linear drive assembly to the second end of said elongated coupling element and second attachment means for fixedly attaching the piston rod of said second linear drive assembly to the first end of said elongated coupling element so to that extension and retraction of said piston rods relative to said cylinders will cause extension and contraction of said lifting assembly.