Cutting assembly including expanding wall segments of auger

Details Cutting assembly including expanding wall segments of auger Cutting assembly including expanding wall segments of auger

1981-06-25

1983-09-27

Purser, Ernest R.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Adjustable head

175267, 175285, E21B 728

Patent

active

044065000

ABSTRACT:
A mining auger comprises a cutting head carried at one end of a tubular shaft and a plurality of wall segments which in a first position thereof are disposed side by side around said shaft and in a second position thereof are disposed oblique to said shaft. A vane projects outwardly from each wall segment. When the wall segments are in their first position, the vanes together form a substantially continuous helical wall. A cutter is mounted on the peripheral edge of each of the vanes. When the wall segments are in their second position, the cutters on the vanes are disposed radially outward from the perimeter of the cutting head.

REFERENCES:
patent: 3642325 (1972-02-01), Mulvaney
patent: 4159149 (1979-06-01), Castanoli

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