E - Fixed Constructions – 06 – C
Patent
E - Fixed Constructions
06
C
228/11, 212/28.5
E06C 5/04 (2006.01) E06C 7/02 (2006.01)
Patent
CA 1205437
ABSTRACT OF THE DISCLOSURE A ladder or boom extension system includes a base section, at least one movable section telescoping arrangement with the base section, and a piston rod fixedly connected longitudinally of the base section. A double acting hydraulic cylinder is movable relative to the piston rod in response to the application of hydraulic forces on either side of a fixed piston. A crosshead including cable carrying pulleys is affixed at each end of the hydraulic cylinder whereby the cylinder and the crossheads travel as a unit for extension and retraction while tensioning in response to hydraulic forces. Extension and retraction cables interconnect between the base section and the movable section and are trained about the crosshead pulleys to pull the movable section toward or away from the base section. The crosshead pulleys tension the cables upon longitudinal movement of the cylinder to either extend or retract the movable section or sections relative to the base section as the cylinder is longitudinally urged along the piston rod.
433581
Borden Ladner Gervais Llp
Zimmerman Mahlon N.
LandOfFree
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