Fire escape – ladder – or scaffold – Ladder – With hook or grab
Reexamination Certificate
2005-06-21
2005-06-21
Thompson II, Hugh B. (Department: 3634)
Fire escape, ladder, or scaffold
Ladder
With hook or grab
C182S083000, C182S106000, C405S283000
Reexamination Certificate
active
06907957
ABSTRACT:
A trench shield ladder that hangs on the wall of the trench shield to provide workmen safe access to a trench. The ladder is provided with a top platform and hand rails that extend over the platform. The ladder can be adjusted in length by employing an extension portion with hooks that hang the extension on the main rungs of the main ladder. The extension portion is not as wide as the main portion of the ladder so that the legs of the extension rest between the legs of the main portion of the ladder. The ladder and extension are provided with stand off arms that hold the main and extension rungs of the ladder away from the wall of the trench shield. The present invention is designed to fit on trench shields of varying thicknesses.
REFERENCES:
patent: 3029607 (1962-04-01), Millerbernd
patent: 3591123 (1971-07-01), Edwards
patent: 3727413 (1973-04-01), Christen
patent: 3766740 (1973-10-01), Teegen
patent: 3922866 (1975-12-01), Benning
patent: 5195849 (1993-03-01), Stapleton
patent: 5527137 (1996-06-01), Spencer
patent: 6155750 (2000-12-01), Wu et al.
patent: 6224296 (2001-05-01), Fukumori
patent: 6443665 (2002-09-01), Kundel, Sr.
patent: 2615218 (1988-11-01), None
McKay Molly D.
Thompson II Hugh B.
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