Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Tooth mounted on helical head portion or head with helical...
Patent
1978-12-06
1980-09-30
Purser, Ernest R.
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Tooth mounted on helical head portion or head with helical...
299 87, E21C 2510
Patent
active
042251907
ABSTRACT:
A mining auger includes an auger shaft having a front end, a conical end ring affixed to the front end of the auger and having a forwardly oriented face and a peripheral edge zone; a plurality of tool holders affixed to the peripheral edge zone in a circumferential distribution and each having a forwardly oriented face; and a cutting tool bit carried in each tool holder. Each cutting tool bit projects forwardly beyond a peripheral edge of the conical end ring and has a longitudinal axis extending at an inclined orientation with respect to an imaginary frontal plane which is perpendicular to the auger axis and which generally coincides with the mine wall face during operation. At least some of the tool holders carry a shearing tool bit each having an axis extending from the forwardly oriented face of the conical end ring in the direction of the frontal plane and further, each shearing tool bit has a tip which is at a significant distance from the forwardly oriented face of the respective tool holder.
REFERENCES:
patent: 3718369 (1973-02-01), Anderson
patent: 3847439 (1974-11-01), Allen
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