Ladder leveler

Details Ladder leveler Ladder leveler

1994-09-29

1996-04-16

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Ladder

Supporting surface compensating means

182204, E06C 744

Patent

active

055073646

ABSTRACT:
A ladder leveler includes a frame unit that is adjustable in two degrees of freedom and has a wide range of adjustment. The rungs of a ladder being leveled are supported, and brakes are located between the rung supporting element and the remainder of the frame unit. The brakes can be located between the rung supporting element and crossbars on the frame unit and/or between the crossbars and stanchions of that frame unit. At least two rungs of the ladder are supported. If three rungs are supported, one of the rungs will be supported from beneath that rung, and the stanchions are telescoping.

REFERENCES:
patent: 666526 (1901-01-01), Howard
patent: 973103 (1910-10-01), Boyd
patent: 1154614 (1915-09-01), Crofts
patent: 1329740 (1920-02-01), Barron
patent: 1516968 (1924-11-01), Redman
patent: 2147052 (1939-02-01), Noone
patent: 2327317 (1943-08-01), Randall
patent: 2449609 (1948-09-01), Linder
patent: 3173512 (1965-03-01), Sturdy
patent: 3233702 (1966-02-01), Feltrop
patent: 4807720 (1989-02-01), Kim
patent: 4896745 (1990-01-01), Warnelou
patent: 4984655 (1991-01-01), Scherer
patent: 5044468 (1991-09-01), Worthington

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