Fire escape – ladder – or scaffold – Ladder – With reinforcing means
Patent
1988-12-05
1989-08-01
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
With reinforcing means
182 67, 182106, E06C 710
Patent
active
048526908
ABSTRACT:
In a ladder tower having multiple telescoping sections, each section includes a pair of longitudinally extending, laterally spaced apart truss members and a plurality of longitudinally spaced ladder rungs interconnecting the truss members. Each truss member includes an upper elongated hand rail, a lower elongated rung rail being spaced below and lying in a common plane with the upper hand rail, and a plurality of braces extending between and interconnecting the upper hand rail and lower rung rail of each truss member. The ladder rungs of each section extend between and interconnect the rung rails of the truss members thereof. Pretensioning structure is connected to the hand rail of each truss member so as to load the hand rail in compression and the rung rail in tension and thereby substantially offset the dead load of each section due to its weight and permit an increase in the live load capacity of each section. Further, the hand rail of each truss member of each ladder tower section is hollow. The pretensioning structure being connected to the hand rail of each truss member includes a pretensioned flexible member in the form of a cable disposed in the hollow hand rail of the truss member and anchored at its opposite ends to the hollow hand rail at locations within and spaced from opposite ends of the hand rail.
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Flanagan John R.
Machado Reinaldo P.
Simon Ladder Towers, Inc.
Swartz Michael R.
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