Boring or penetrating the earth – With below-ground tool drive prime mover – With means to anchor prime movers support to bore wall
Patent
1996-03-11
1998-06-02
Neuder, William P.
Boring or penetrating the earth
With below-ground tool drive prime mover
With means to anchor prime movers support to bore wall
175 51, E21B 4300
Patent
active
057587310
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.
REFERENCES:
patent: 3224734 (1965-12-01), Hill et al.
patent: 3326008 (1967-06-01), Baran et al.
patent: 3330368 (1967-07-01), Baran et al.
patent: 4372161 (1983-02-01), ed Buda et al.
patent: 4558751 (1985-12-01), Huffaker
patent: 5458575 (1995-10-01), Wang
Lockheed Martin Idaho Technologies Company
Neuder William P.
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