Fire escape – ladder – or scaffold – Ladder with pivoted prop – Pivoted to top-step cleat
Patent
1991-08-30
1992-11-17
Chotkowski, Karen J.
Fire escape, ladder, or scaffold
Ladder with pivoted prop
Pivoted to top-step cleat
182159, E06C 700
Patent
active
051635330
ABSTRACT:
A brace fastener for holding a step brace in position when the folding ladder in which said step brace is fastened is set up into shape, comprising a spring plate in an inverted T shape attached to either sidepiece of said folding ladder to hold a hook member in place and a control member movably hooked in said hook member for performing a second-order lever. Attaching said control member to the outer surface of the sidepiece of the folding ladder permits the hook member to be moved into a locking position to lock the step brace in position when the folding ladder is set up. Rotating the control member downwards causes the hook member to disconnect from the step brace so that the folding ladder can be collapsed.
REFERENCES:
patent: 2670120 (1954-02-01), Sanguineti
patent: 2727671 (1955-12-01), Ollerhead
patent: 3084760 (1963-04-01), Lamberti
patent: 4549632 (1985-10-01), Inoue
patent: 4815564 (1989-03-01), Yoo
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