Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1989-02-08
1991-05-07
Chotkowski, Karen J.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
182214, 182107, 182108, E06C 748
Patent
active
050128957
ABSTRACT:
For enhancing the safety of a ladder, adjustable extensions (14) can be attached to the bottom ends of the side rails of the ladder so as effectively to adjust the lengths of such rails so that the ladder will not lean to either side, regardless of any difference in heights of the ground or support areas under such rails. Also coupling cables (66) couple the ladder to the wall of the building against which the ladder leans. The coupling cables connect the midpart of the ladder to a horizontal wall cable (64) which is attached along and parallel to the wall of the building. The top of the ladder is stabilized against rolling to either the left or right and so that it can be positioned stably against irregular supports, such as windows, eaves, pitched roofs, pipes, etc., by means of stabilizing bars (74) connected to its top and suitably shaped to mate with the irregular supports, and by extension arms (82) which project out from the top of the ladder. Hand holds (88) are attached to the extension arms.
REFERENCES:
patent: 2808975 (1957-10-01), Palmquist
patent: 2881028 (1959-04-01), Baird
patent: 3703939 (1972-11-01), Maxwell
patent: 4061203 (1977-12-01), Spencer et al.
patent: 4502566 (1985-03-01), Wing
patent: 4554994 (1985-11-01), Weiner
patent: 4593790 (1986-06-01), Brewer et al.
patent: 4669576 (1987-06-01), Jones et al.
patent: 4683980 (1987-08-01), Vayko
patent: 4683982 (1987-08-01), Baker
patent: 4683983 (1987-08-01), Murphy
60 Minutes broadcast 1986-3-23: "So Sue Me".
Chotkowski Karen J.
Couch, IIII Joseph H.
Pressman David
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