Bridges – Gangway – ramp – or dock leveler
Reexamination Certificate
2005-08-16
2005-08-16
Hartmann, Gary S. (Department: 3671)
Bridges
Gangway, ramp, or dock leveler
C296S061000
Reexamination Certificate
active
06928683
ABSTRACT:
Various types of extendable support structures provide a lateral dimension that is defined by at least one lazy tong, and the longitudinal dimension is variable by extension and retraction of the at least one lazy tong. The extendable structure may include a plurality of adjacent and attached lazy tongs that are capable of supporting a significant load through the interconnection of the adjacent lazy tongs forming the structure. The extendable structure may be fully retracted to minimize the longitudinal dimension and thereby provide a compact structure, such as one that can be easily transported or stored. The extendable structure may be extended to a length as required for a particular purpose and limited to a maximum longitudinal dimension when the structure is being used to support a load. As such the various types of extendable support structures may be used in many scenarios, such as for providing a loading ramp, bridge, walkway, or working surface.
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Ramon Sastre, “Expandable Arches,” 1996,School of Architecture of the Vallès. Department of Architectural Technology 1, Polytechnic University of Catalunya, Sant Cugat del Vallès, Spain.
Hanson Stuart Craig
Penz Frederik D.
Hartmann Gary S.
Withers & Keys LLC
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