Method and apparatus for advancing tethers
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United States of America Patent
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Jun 2, 1998
Grant Date -
N/A
app pub date -
Mar 11, 1996
filing date -
Mar 11, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tether puller for advancing a tether through a channel may include a bellows assembly having a leading end fixedly attached to the tether at a first position and a trailing end fixedly attached to the tether at a second position so that the leading and trailing ends of the bellows assembly are located a substantially fixed distance apart. The bellows assembly includes a plurality of independently inflatable elements each of which may be separately inflated to an extended position and deflated to a retracted position. Each of the independently inflatable elements expands radially and axially upon inflation. An inflation system connected to the independently inflatable elements inflates and deflates selected ones of the independently inflatable elements to cause the bellows assembly to apply a tractive force to the tether and advance it in the channel.
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