Fire escape – ladder – or scaffold – Ladder – With hook or grab
Patent
1978-05-18
1979-03-27
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
With hook or grab
182194, 182106, 248215, E06C 136, E06C 748
Patent
active
041461142
ABSTRACT:
This invention relates to a specialized ladder for use with a ring-like shield bordering the entryway into a manhole, said ladder being characterized by hook-forming subassemblies depending from the right and left handrails adapted to releasably hook over the upwardly-facing rim of the shield, each such hook subassembly including a hanger member projecting out over the shield rim in overhanging relation to the latter, a downwardly and inwardly inclined tubular slide on the overhanging end of the hanger member and a self-locking latch pin mounted within said slide for automatic free-sliding gravitational movement therein from a retracted unlocked position out of contact with the cylindrical shield wall into an extended latched position resting thereagainst. The ladder also includes a horizontally-disposed stop pin projecting from each handrail cooperating with one or the other of a pair of vertically-disposed pins hanging down from the underside of the hanger member in radially-spaced relation to simultaneously engage the upper rim-encircling flange of the shield and cylindrical inside wall thereof so as to maintain said ladder in a stable more or less vertical position closely adjacent the wall of the entryway.
REFERENCES:
patent: 2843393 (1958-07-01), Dahlander
patent: 2854292 (1958-09-01), Schaeffer
patent: 3078955 (1963-02-01), Rich
patent: 3120290 (1964-02-01), Kamrath
patent: 3869742 (1975-03-01), Gale
Machado Reinaldo P.
Spangler, Jr. Edwin L.
T. A. Pelsue Company
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