Anti-two block device using non-contract measuring and detecting devices
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United States of America Patent
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Feb 5, 2002
Grant Date -
N/A
app pub date -
Dec 4, 1998
filing date -
Dec 5, 1997
priority date (Note) -
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Abstract
In the anti-two block device, a non-contact measuring device detects in one form or another the distance between a boom nose and a load-bearing member supported thereby. If the distance detected is less than a predetermined threshold value, the device triggers a warning or other operation to assist an operator in preventing anti-two blocking.
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