Fire escape – ladder – or scaffold – Ladder with vertically moving platform or escape – Ladder supports platform
Reexamination Certificate
2007-08-30
2011-12-13
Shue, Alvin Chin (Department: 3634)
Fire escape, ladder, or scaffold
Ladder with vertically moving platform or escape
Ladder supports platform
C182S101000, C182S102000, C182S115000, C182S129000
Reexamination Certificate
active
08074769
ABSTRACT:
A device is provided for aiding a user in transporting a load up and down a ladder assembly. The ladder assembly includes a fly ladder having slidably connected to a base ladder. Each ladder includes first and second spaced rails interconnected by a plurality of spaced rungs. The device has a frame assembly including a first subframe positionable adjacent the first rail of the base ladder and a second subframe positionable adjacent the second rail of the base ladder. First and second base ladder guides are operatively connected to each subframe and define tracks for receiving the rails of the base ladder therebetween. First and second fly ladder guides are operatively connected to the subframes and defines tracks for receiving the rails of the fly ladder therebetween.
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Goesch Daniel J.
Haag Elliot J.
Hamel Logan J.
Sracic Michael W.
Tengler David J.
Boyle Fredrickson , S.C.
Chin Shue Alvin
Quinn Colleen M
Wisconsin Alumni Research Foundation
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