Arrangement at telescopic lifting beam
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United States of America Patent
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-
Jan 23, 2007
Grant Date -
Feb 26, 2004
app pub date -
Feb 22, 2002
filing date -
Mar 28, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Two telescopic lifting beams are loaded in their protruded position and are driven from a retracted position to a protruded position. In order to improve the bending strength of the lifting beams, the lifting beams are surrounded by two telescopic tubes, one of the tubes being fixed to the outer end of the telescopic first lifting beam and is slideable on the second telescopic tube, which extends inwardly on the second lifting beam.
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