Fire escape – ladder – or scaffold – Having transpositioning base and erecting means – Ladder pivotably mounted on transpositioning base
Reexamination Certificate
2005-04-26
2005-04-26
Thompson, II, Hugh B. (Department: 3634)
Fire escape, ladder, or scaffold
Having transpositioning base and erecting means
Ladder pivotably mounted on transpositioning base
C182S069500, C182S141000, C187S269000, C248S421000
Reexamination Certificate
active
06883641
ABSTRACT:
A ground-movable load-lifting vehicle for lifting a load over ground. The vehicle comprises a platform bed, a ground-movable carriage, and an extendible scissor linkage assembly supporting the platform bed spacedly over the carriage. A hydraulic ram system enables power extension of the scissor linkage assembly against the bias of a load supported by said platform bed. The carriage further includes peripheral ground-engageable pivotal casters, rotatably mounted to the carriage in spaced apart fashion, and a pair of ground-engageable drive wheel assemblies, mounted for relative movement to a central portion of the carriage, wherein the drive wheel assemblies provide omnidirectional displacement capability for this load-lifting vehicle. A power unit, controlled by an electronic circuit, powers both the hydraulic rams of the scissor linkage assembly and the drive wheel assemblies.
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Martineau F.
Thompson II Hugh B.
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