CRANE IMPROVEMENTS
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United States of America Patent
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Issued Date -
Jan 6, 2011
app pub date -
Jul 6, 2010
filing date -
Jul 6, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Aspects of the present invention relate to crane systems and/or hoists. One aspect includes in combination with a pair of runways in a crane system, a pair of hoist assemblies moveable on the runways, a pair of transfer rails selectively disposable transversely to the runways, the transfer rails including racks for at least a portion of one or both of the hoist assemblies to travel on, a spreader assembly locatable between the hoist assemblies and engaging the runways and/or the hoist assemblies to push the runways or hoist assemblies apart during insertion of the transfer rails between the runways.
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