Drag bit excavation

Details Drag bit excavation Drag bit excavation

1976-11-01

1978-05-02

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

With material-handling

83680, 299 57, 299 87, 299 90, 175394, E21C 2722, E21C 2924

Patent

active

040871312

ABSTRACT:
A drag bit excavating device comprising a core extending along an axis; a bit carrier supported on the core; cutter bits supported by the carrier along a three dimensional spiral having constant pitch and increasing radius along at least a portion of the axis, the carrier being relieved to provide radially extending spaces between the turns of the spiral; a frame supporting the core, carrier, and bits for rotation about and advance along the axis; and a drive to provide rotation, whereby the bits slot the material to be excavated while the material between portions of the resulting slot extends into the spaces to be subsequently broken away.

REFERENCES:
patent: 2417313 (1947-03-01), Mackinnon
patent: 2920878 (1960-01-01), Kandle
patent: 3226855 (1966-01-01), Smith
patent: 3827755 (1974-08-01), Allen
patent: 3856357 (1974-12-01), Wharton
patent: 3904246 (1975-09-01), Gandy
patent: 4016944 (1977-04-01), Wohlfeld

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