Fire escape – ladder – or scaffold – Wall- or floor-attached – Ladder
Patent
1995-08-28
1998-01-06
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Wall- or floor-attached
Ladder
182116, E06C 110
Patent
active
057044481
ABSTRACT:
A modular ladder system for climbing trees is provided, comprising an upper assembly having a first pair of support members attached to one another by a top step; a lower assembly having a second pair of support members attached to one another by a bottom step; a central assembly having a third pair of support members and a third step, wherein the upper and lower assemblies are independently slidable relative to the central assembly; a first lock between the upper assembly and the central assembly for selectively locking the position of the upper assembly relative to the central assembly in an extended position and a retracted position; a second lock between the lower assembly and the central assembly for selectively locking the position of the lower assembly relative to the central assembly in an extended position and a retracted position; an attachment device on the upper assembly for attaching the ladder module to a tree; and a stabilizer on the upper assembly and the lower assembly for stabilizing the ladder module against the tree. In a preferred embodiment, a first portion of the stabilizer is attached to the top step, and a second portion of the stabilizer is attached to the bottom step, the top step is lockingly pivotable relative to the upper assembly; and the bottom step is lockingly pivotable relative to the lower assembly.
REFERENCES:
patent: 2827216 (1958-03-01), Napolitano
patent: 2975857 (1961-03-01), Suroff
patent: 4592446 (1986-06-01), White
patent: 5277273 (1994-01-01), Grimes
patent: 5509499 (1996-04-01), Prejean
"Speed Step", Alumitech. submitted by applicant as prior art.
Chin-Shue Alvin C.
Delaune Warner J.
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