Fire escape – ladder – or scaffold – Ladder – Extension
Patent
1981-01-19
1983-08-02
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
Extension
182 66, E06C 506
Patent
active
043960936
ABSTRACT:
A ladder or boom extension system includes a base section, at least one movable section in 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.
REFERENCES:
patent: 2684159 (1954-07-01), Oldenkamp
patent: 2732992 (1956-01-01), Arps
patent: 2833422 (1958-05-01), Ferwerda
patent: 3059781 (1962-10-01), Bender
patent: 3836011 (1974-09-01), Sakamoto
patent: 4094381 (1978-06-01), Wilkerson
Extension System, of Ladder Towers, Inc., 7/21/80.
Chin-Shue Alvin C.
Machado Reinaldo P.
Spivak Karl L.
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