Reversible roller stabilizer extensions for earth boring head

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector

Patent

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Details

175 53, E21B 300, E21C 900

Patent

active

046976523

ABSTRACT:
The stabilizer extensions are brackets with rollers employed for stabilizing a large boring head when drilling a bore hole in the earth. A hub is provided for attachment to the head. The hub has a plurality of mounting plates located around its axis and radially outward therefrom. Each of the brackets has a bracket mounting plate at one end and a roller mounting plate at the other end. A roller is attached to each of the roller mounting plates for engaging the earth for stabilizing the head. The axis of each of the rollers defines a scalene triangle with two side edges of the bracket mounting plate of its extension bracket. The bracket mounting plate of each of the extension brackets is adapted to be attached to any of the hub mounting plates in a first position or turned 180.degree. and attached thereto in a second position such that the axis of its roller is parallel to the axis of the hub and is located either on one side or the other of a plane extending from the length of the axis of the hub outward and bisecting the bracket mounting plate between its two side edges when the bracket mounting plate is attached to any of the hub mounting plates in said first or second positions.

REFERENCES:
patent: 4301876 (1981-11-01), Harrison et al.
patent: 4365677 (1982-12-01), Owens
patent: 4386670 (1983-06-01), Westermark
patent: 4448270 (1984-05-01), Buske
patent: 4547833 (1985-10-01), Sharp
patent: 4627501 (1986-12-01), Ebeling

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