Self-levelling ladder

Details Self-levelling ladder Self-levelling ladder

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

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