Ladder with leg brace

Fire escape – ladder – or scaffold – Ladder with pivoted prop – Pivoted to top-step cleat

Reexamination Certificate

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Details

C182S025000

Reexamination Certificate

active

06986405

ABSTRACT:
A ladder comprises a foldable frame, a leg spreader, and a leg brace. The leg brace biases leg units of the frame toward one another to stiffen the frame in response to spreading of the leg units away from one another to an unfolded position by the leg spreader.

REFERENCES:
patent: 121190 (1871-11-01), Oakley
patent: 159319 (1875-02-01), Grunewald
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patent: 554695 (1896-02-01), Hood
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patent: 920733 (1909-05-01), Groves
patent: 1110700 (1914-09-01), LeVey
patent: 1212548 (1917-01-01), Parent
patent: 1549402 (1925-08-01), Wittliff
patent: 2172860 (1939-09-01), Weaver
patent: 2470053 (1949-05-01), Salisbury
patent: 2960181 (1960-11-01), Bufogle
patent: 4995525 (1991-02-01), Kehrer
patent: 5715909 (1998-02-01), Gagnon
patent: 5752581 (1998-05-01), Orchowski
patent: 6427805 (2002-08-01), Gibson et al.
patent: 2003/0132058 (2003-07-01), Pollock

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