Fire escape – ladder – or scaffold – Rung or rung-to-stile connection
Patent
1990-07-30
1991-03-26
Chotkowski, Karen J.
Fire escape, ladder, or scaffold
Rung or rung-to-stile connection
182220, 403348, 403263, F16B 700
Patent
active
050021532
ABSTRACT:
An improved ladder structure comprising a pair of stiles, a plurality of rungs, and a plurality of brackets. Wherein, each bracket consisting of two parallel arms, with a securing hole formed on each parallel arm, and a connecting surface running between the parallel arms, with a rivet hole formed thereon. Each rung has a pair of insertion recesses formed on either end, each recess being diametrically opposed with the other. At a predetermined distance inwards form each insertion recess is formed an insertion slot. Both the insertion recesses and insertion slots pass through one of a pair of through-holes formed internally on opposing arcuate surfaces of a rung, extending from one end to the other. Whereby, on either end of a rung, a pair of opposing brackets are inserted into corresponding insertion slots and insertion recesses, and subsequently secured in place by insertion of dowel pins into the through-holes. Each stile has a C-shaped cross-section with an opening running along its length, interrupted by semi-circular arcs defining entrances for corresponding rungs. An end of a rung is positioned within a stile so as to abut the arcuate surfaces of the rung against the arcuate edges of the stile entrances and align the rivet holes of the pair of opposing brackets with a corresponding pair of side holes formed on either side of the opening. Whereupon, a pair of pull-mandrel rivets secure the brackets to the stile.
REFERENCES:
patent: 2989141 (1961-06-01), Howard
patent: 3232378 (1966-02-01), Larson
patent: 3468093 (1969-09-01), Fuss et al.
patent: 3871481 (1975-03-01), Ballek
patent: 4063836 (1977-12-01), Militano
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