Ladder with anti-deformed side rails

Details Ladder with anti-deformed side rails Ladder with anti-deformed side rails

1998-09-23

2000-03-07

Stodola, Daniel P.

Fire escape, ladder, or scaffold

Rung or rung-to-stile connection

1822284, 182219, E06C 708

Patent

active

060327596

ABSTRACT:
A ladder with anti-deformed side rails comprises two tubular side rails, a plurality of rungs, and two tubular inner bushings. Each of the bushings is tightly fitted with the inner surface of each side rail respectively and passed through by the respective end of the lowest rung. Additionally, the longitudinal length of the bushings ranging from 2/5 to 3/5 of the distance between two neighbor rungs, and the thickness of the bushings ranging from 4/5 to 1 of the thickness of the side rails lead to an optimum bending strength for the side rails.

REFERENCES:
patent: 3734237 (1973-05-01), Howard
patent: 3997027 (1976-12-01), Patterson et al.
patent: 4998982 (1991-03-01), Arnlod et al.

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