Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1986-08-13
1987-06-16
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
2481883, E06C 744
Patent
active
046730613
ABSTRACT:
An automatic ladder leveling apparatus includes a pair of extension members and a relatively stiff, cable-like semi-flexible elongated member. Each extension member is disposed adjacent to one side rail of the ladder for slidable movement equally freely in either direction therealong. The semi-flexible elongated member has a middle portion which makes only one pass across the ladder between its side rails. The middle portion of the elongated member extends through the lowest rung of the ladder. Opposite end portions of the elongated member extend in opposite directions from its middle portion and along the side rails of the ladder above its one lower rung where they attach to the respective extension members at locations between their opposite ends thereof. A block is disposed in the lowest rung of the ladder and has a portion between the middle portion of the elongated member and an upper portion of the rung. The block has surface portions and opposite corners which frictionally engage and crimp the middle portion of the elongated member when the weight of a user is applied to the ladder so as to substantially prevent slippage of the elongated member with respect thereto once the extension members have been placed in contact with a support surface and slidably self-adjusted along the side rails of the ladder for positioning and supporting the ladder in a generally leveled upright condition.
REFERENCES:
patent: 2330825 (1943-10-01), Hoit
patent: 2366829 (1945-01-01), Biery
patent: 2890824 (1959-06-01), Derby et al.
patent: 2969126 (1961-01-01), Gardner
patent: 3173512 (1965-03-01), Sturdy et al.
patent: 3233702 (1966-02-01), Feltrop
patent: 3258085 (1966-06-01), McCarty
patent: 3260329 (1966-07-01), Zevely
patent: 3794141 (1974-02-01), Sturm
patent: 4497390 (1985-02-01), Wilson
Flanagan John R.
Machado Reinaldo P.
Swartz Michael R.
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