Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground feed means
Patent
1977-01-28
1978-04-25
Leppink, James A.
Boring or penetrating the earth
With below-ground tool drive prime mover
With below-ground feed means
175 61, E21C 700
Patent
active
040858081
ABSTRACT:
A self-driving and self-locking device for traversing the inner walls of channels enclosed on all sides, or for traversing the outer casing of structures with a substantially constant cross-section over their lengths, and for affixing itself thereon, which includes a frame, propulsive elements disposed on said frame and at least one drive means for said propulsive elements to produce movement in the desired direction of movement of said device, said propulsive elements being distributed about the outer or inner circumference relative to a longitudinal axis coinciding substantially with the direction of forward movement and adjustable with respect to the longitudinal axis in a substantially radial direction relative to said frame to adapt to the contact surfaces in the channel or on the elongated structure.
REFERENCES:
patent: 1326480 (1919-12-01), Dana
patent: 2481009 (1949-09-01), Gill
patent: 2756037 (1956-07-01), Kirkpatrick
patent: 3326008 (1967-06-01), Baran et al.
patent: 3354969 (1967-11-01), Ebeling
patent: 3888319 (1975-06-01), Bounne, Jr et al.
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