Roof drill bit with hexagonal body portion

Details Roof drill bit with hexagonal body portion Roof drill bit with hexagonal body portion

1978-12-21

1980-02-26

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175320, 175415, 175418, E21C 1300

Patent

active

041901282

ABSTRACT:
An improved drill bit for the mining field for use as a roof drill, tunnel drill, rock boring and highway construction, both as a rotary and a rotary percussion drill, which includes a drill head with a diametrical slot positioning a brazed cutting blade, the head having a male drive shank to interfit with a female driver tube and having a maximum axial passage in the driver shank which opens to large fluid passages leading to chip slash openings in opposed quadrants of the drill bit. The drill head position has a hexagonal base portion above the drive shank with circular guiding portions in opposed quadrants adjacent the chip slash quadrant pockets.

REFERENCES:
patent: 3022840 (1962-02-01), Hohos et al.
patent: 3187825 (1965-06-01), Bower, Jr.
patent: 3554306 (1971-01-01), Wilburn
patent: 3774556 (1973-11-01), Poll
patent: 4019590 (1977-04-01), Hansen et al.
patent: 4086972 (1978-05-01), Hansen et al.
patent: 4099585 (1978-07-01), Emmerich

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