Collapsible cutterhead for drilling upward

Details Collapsible cutterhead for drilling upward Collapsible cutterhead for drilling upward

1977-04-13

1978-04-11

Purser, Ernest R.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

175171, 175258, E21B 900

Patent

active

040834166

ABSTRACT:
A cutterhead adapted for drilling a hole upwardly in the earth, and to then be withdrawn downwardly through a casing which is inserted underneath the cutterhead, characterized by gauge cutters which are pivotally mounted on the cutterhead so that they will pivot upward and radially inward when the cutterhead is drawn into the casing, and also characterized by stabilizer rollers mounted on removable frames that can be detached.

REFERENCES:
patent: 1571309 (1926-02-01), Wall
patent: 2588068 (1952-03-01), Williams et al.
patent: 2705129 (1955-03-01), Menton et al.
patent: 4031972 (1977-06-01), Burg

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