Fire escape – ladder – or scaffold – Ladder – Extension
Patent
1977-12-16
1982-12-21
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
Extension
E06C 706, E06C 108
Patent
active
043644511
ABSTRACT:
A locking mechanism for a ladder of the extension type having sections slidable over each other where such locking mechanism is affixed to one section and hooks over a rung of the other section to secure the two sections at the desired height, and where such locking mechanism is withdrawable from the plane of the second section during raising or lowering of this section such that it does not bounce and bump against the rungs of the second section during raising or lowering.
REFERENCES:
patent: 856875 (1907-06-01), Hughes et al.
patent: 1170395 (1916-02-01), Beatty
patent: 2310441 (1943-02-01), Klum
Chickering Robert B.
Grunewald Glen R.
Machado Reinaldo P.
Utility Products, Inc.
Warren Manfred M.
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