Method of operating a shiplift
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United States of America Patent
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-
Aug 3, 2010
Grant Date -
Nov 27, 2008
app pub date -
Jun 16, 2005
filing date -
Jun 16, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A platform includes main transverse beams (“MTBs”), each supported by at least one hoist. It is determined whether a load on any MTB is different from the load on any other MTB by more than a predetermined amount. An MTB which has a load different from the load on any other MTB by more than a predetermined amount is selected and then vertically moved with respect to the other MTBs within a predetermined safety limit to transfer load between the selected MTB and the other MTBs while monitoring the loads on each MTB and the position of the selected MTB as vertical movement of the selected MTB proceeds. The monitored loads and position are compared with the safety limit; and the movement of the selected MTB stopped when either the desired load transfer is completed or the safety limit has been met.
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