Fire escape – ladder – or scaffold – Wall- or floor-attached – Ladder
Patent
1993-03-02
1994-01-11
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Wall- or floor-attached
Ladder
182194, 182206, 182 46, E06C 904
Patent
active
052772721
ABSTRACT:
A non-metallic ladder for use in a manhole in which permanent manhole steps have been installed and spaced relation from the top of the manhole to a position above the bottom and there being a pair of spaced side members on said ladder connected transversely by spaced steps to form corners at the top in which there are spaces to fit over a respective side members on the step. The spaces may be in the shape of a rectangular cross-section or other configuration. The ladder is "hung" from the step to resist dislodgment therefrom. There may be provided a wall bumper member at the bottom of the ladder to engage the inside wall of the manhole.
REFERENCES:
patent: D176238 (1955-11-01), Wallace
patent: 247416 (1881-09-01), Row
patent: 1944384 (1934-01-01), West
patent: 4548294 (1985-10-01), Ruda et al.
patent: 4834216 (1989-05-01), Wallick, Jr. et al.
Montgomery Joseph H.
Williams Craig B.
Chin-Shue Alvin C.
Henry Patrick F.
M.A. Industries, Inc.
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