Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent
1992-03-27
1994-07-05
Bagnell, David J.
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
175 53, 301 391, E21B 728, E21B 1710, B60C 1704
Patent
active
053259327
ABSTRACT:
A down remaining apparatus has an upper stabilizer which supports the down reaming apparatus in the bored hole. A plurality of wheel assemblies are radially attached to the hub of the upper stabilizer. Each of the wheel assemblies has rotatable tires oriented against the bored hole wall, and a rotatable overload wheel which contacts the tunnel wall upon compression of the tires. A weight assembly comprising a plurality of stacked plates is secured to the frame of the down reaming apparatus and has manways therethrough which allow passage of workers. A lower stabilizer provides additional support for the down reaming apparatus. A plurality of wheel assemblies are radially attached to the hub of the lower stabilizer. Each of the wheel assemblies has a rotatable wheel pivotally attached to the lower stabilizer hub and spaced therefrom by a compressible bumper which reacts against the bored hole wall to stabilize the down reaming apparatus.
REFERENCES:
patent: 2049268 (1936-07-01), Ludwick
patent: 3383946 (1968-05-01), Justman
patent: 3840272 (1974-10-01), Crane et al.
patent: 3965995 (1976-06-01), Sugden
patent: 3999616 (1976-12-01), Crane et al.
patent: 4009909 (1977-03-01), Robbins et al.
patent: 4270618 (1981-06-01), Owens
patent: 4646853 (1987-03-01), Sugden et al.
patent: 5199515 (1993-04-01), Sinclair et al.
Anderson Llewellan
Kelley Brian W.
Rowe Larry F.
Whitehouse Thomas C.
Bagnell David J.
The Robbins Company
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