Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1993-07-22
1994-08-09
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
182205, 2481885, E06C 744
Patent
active
053357540
ABSTRACT:
A self-levelling ladder has a pair of spaced-apart side rails and a plurality of spaced-apart rungs extending between the side rails. A pair of elongated sleeves slidably embrace the bottoms of the rails. Each sleeve has opposite sides. One of the sides has a plurality of spaced-apart teeth thereon. A pawl connected to each of the rails engages one of the teeth on one said sleeve.
REFERENCES:
patent: 970425 (1910-09-01), Curran
patent: 3527321 (1970-09-01), Brown
patent: 4807720 (1989-02-01), Kim
patent: 5082088 (1992-01-01), Krause
patent: 5107958 (1992-04-01), Johnson
patent: 5154257 (1992-09-01), Mirles
patent: 5174412 (1992-12-01), Vega
Cameron Norman M.
Chin-Shue Alvin C.
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