Synchronization of spreader twist-locks in twin lift operations
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United States of America Patent
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Oct 29, 2013
Grant Date -
Mar 17, 2011
app pub date -
Apr 10, 2007
filing date -
Apr 20, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A spreader includes inner and outer locks connectable to the corner castings of a single container and to two containers connectable in twin relation to the spreader. The outer lock is carried in pairs in the ends, respectively, of extendable beams telescopically supported in a main beam. The inner lock is moveable in pairs on the main beam exterior. In each set of associated pairs of inner and outer locks, the pair of inner locks is operable for displacement through a second drive which is separate from a first drive that is operative for displacement of the outer lock through extension or retraction of the extendable beam.
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