Fire escape – ladder – or scaffold – Wall- or floor-attached – Ladder
Patent
1985-08-15
1986-05-06
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Wall- or floor-attached
Ladder
182206, 182207, 52182, E06C 910, E06C 748
Patent
active
045865850
ABSTRACT:
My invention relates to an extensible stairway capable of being shipped in a knockdown condition and erected with a minimum of labor and without special tools. The stairway has a pair of stair step stringer assemblies each stringer assembly having a pair of telescoping channels nesting slidably together that can be extended to a required height. The vertical load bearing side walls of said channels are provided with a series of registering groups of equally step spaced in-line bores arranged to lie in a substantially horizontal line when the stringer channels are placed in stair inclined position. A plurality of stair step assemblies having tread supports are adapted to be swivably mounted and clamped to said groups of in-line bores to maintain the treads in a horizontal position when the stringers are inclined forwardly to an ascent angle. A rotatable bracket is located at the upper end of each of the inside channels enabling them to be mounted in an inclined position to the upper level of a structure. Clamping means is provided for fixedly securing said rotatable bracket individually to the upper level of the structure.
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patent: 4367689 (1982-12-01), Dever
Hershberger Gerald R.
Machado Reinaldo P.
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