Elevator – industrial lift truck – or stationary lift for vehicle – Stairway assist for individual or minor barrier lift for...
Reexamination Certificate
2007-06-26
2007-06-26
Crawford, Gene O. (Department: 3654)
Elevator, industrial lift truck, or stationary lift for vehicle
Stairway assist for individual or minor barrier lift for...
C187S201000, C182S141000
Reexamination Certificate
active
11305119
ABSTRACT:
A convertible lift assembly is provided in which a vertical lift can be reversibly converted into a set of stairs. The assembly of the present invention uses less space than prior art system, and utilizes a set of movable side panels that can be contracted or extended to provide resting points for a series of stair panels. When in a contracted position, the side panels provide resting points in a stair configuration for the stair panels. When in an extended position, the stair panels are collected on a frame to provide an essentially flat, horizontal platform that can be raised or lowered on a movable frame.
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Crawford Gene O.
Gowan Intellectual Property
Matthews Terrell
Thomson & Leonard
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