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Twin-Path® slings have the Fiber Optic inspection system. The
condition of the internal core yarn can be inspected just by
checking the continuity of the fiber optic cable. If crushing
or cutting, heat or chemical damage, has occurred then the
damage to the fiber optic cable will destroy its ability to
transmit light from one end to the other giving the inspector
a reason to remove the sling from service and send it in for
repair evaluation. The fiber optic cable will conduct light
using natural, overhead or flashlight sources. The inspector
simply covers and removes his finger from one end and watches
the other end for blinking which indicates that the sling is
OK to use for another lift.
US Patent #4,850,629, #5,651,572
CN #1,280,458, #2,195,393
Italy #97300367.6
Japan # 2929431
Australia # 707924
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