Fire escape – ladder – or scaffold – Ladder with vertically moving platform or escape – Ladder supports platform
Patent
1988-12-02
1989-10-24
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder with vertically moving platform or escape
Ladder supports platform
182 82, 182145, 182206, 187 10, E06C 504, B66B 920
Patent
active
048755478
ABSTRACT:
A portable conveyor system comprises an extensible and retractable boom assembly mounted on a transportable stationary support. The boom assembly comprises a plurality of longitudinally spaced rungs defining a series of supporting surfaces for a primary load carrier of the type described in applicant's co-pending U.S. patent application Ser. No. 75,410, now U.S. Pat. No. 4,793,437. The improvements described herein include a vertically adjustable hitch mounted forwardly on a frame of the primary load carrier. The hitch is adapted for attachment to the end of the cable of a winch assembly to move the endless tracks of the carrier in full contact along the supporting surfaces of the rungs. Other improvements include modified boom and overhead bracket assemblies, a resilient suspension system for the primary load carrier and a platform assembly attachable to either end of the boom assembly to alternately function as a loading or unloading platform.
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patent: 4793437 (1988-12-01), Hanthorn
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