Locking device of extendable and retractable container semi-trailers
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United States of America Patent
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May 19, 2009
Grant Date -
Feb 1, 2007
app pub date -
Jun 13, 2006
filing date -
Jun 17, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A locking device of extendable and retractable container semi-trailers comprises four link bars, two lock pin assemblies, a crossmember, a falling tube and a pull assembly. Two ends of the pull assembly are connected with two link bars and one lock pin assembly respectively. Said pull assembly comprises an automatic locking and releasing device fixed rotatablely between a bottom plate and a top plate of said crossmember. The pull assembly is rotated round the automatic locking and releasing device to a locking place, and the automatic locking and releasing device locks said pull assembly. The falling tube acts on the automatic locking and releasing device, and the pull assembly is released.
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