Automatic blockading system device for ladders or folding portab

Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Collapsible ladder

Patent

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Details

182160, F06C 100

Patent

active

056853947

ABSTRACT:
A pair of laterally positioned struts are interconnected by a plurality of rungs, each rung being formed of a pair of pivotally mounted rung sections. A central rod extends between the inner ends of the rung sections of each rung, the central rod being rigid with a fastener member beneath each pair of rung sections. The inner ends of each pair of rung sections are individually pivoted to a fastener member. A pair of diverging stabilizing rods are centrally joined to a joinder member slidably on the central rod and positionable in direct underlying and supporting engagement with the fastener member of the lowermost rung in the open position of the ladder.

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patent: 3259207 (1966-07-01), Schoeffler
patent: 4016954 (1977-04-01), Hickman
patent: 4042991 (1977-08-01), Macy et al.
patent: 4560030 (1985-12-01), Muscelli
patent: 4569419 (1986-02-01), Stolz

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