Ladder having an attached transportation device

Details Ladder having an attached transportation device Ladder having an attached transportation device

2007-02-01

2010-12-14

Chin-Shue, Alvin C (Department: 3634)

Fire escape, ladder, or scaffold

Convertible

Reexamination Certificate

active

07849961

ABSTRACT:
A ladder has a pair of parallel stiles and a plurality of rungs extending between the stiles. Midway along the length of the ladder is a pair of moveable arms having a first end rotatably attached to one of the stiles and a pair of wheels rotatably attached to the second ends thereof. The arms are moveable between a first position in which the axis of the arms are generally parallel to the axis of the stiles and the axle for the wheels attached to the second end is adjacent to the stiles, and a second position in which the second end of the arms and the wheels attached thereto are spaced from the stile for rolling the ladder across the ground.

REFERENCES:
patent: 535082 (1895-03-01), Snell
patent: 1004284 (1911-09-01), Lehmann
patent: 2597902 (1952-05-01), Roketa
patent: 3612218 (1971-10-01), Blair et al.
patent: 3731947 (1973-05-01), Fontaine
patent: 4009762 (1977-03-01), Bjerkgard
patent: 4428456 (1984-01-01), Rohde
patent: 5810373 (1998-09-01), Miranda
patent: 6681893 (2004-01-01), Coulson

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