Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1977-11-09
1980-02-26
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
175320, 175411, 175418, 408226, E21C 1310, E21C 1500
Patent
active
041901258
ABSTRACT:
An improved roof drill bit for use in mining operations in which a carbide insert is diametrically located in a cylindrical body and held on axial prongs in diametrically opposed quadrants of the body by a brazed connection; diverging axial holes for coolant are positioned in said prongs to open at the trailing side of the cutting edges of the carbide insert to flood the edges with coolant liquid and flush cuttings into the other quadrants. The coolant passages also pass near the brazed face of the insert to cool the body in this area and minimize softening of the braze. The bit shank and driving steel have cooperating axial grooves forming a passage for the coolant liquid to the bit body. The driving steel and bit body also have aligned chordal sides providing a passage for flushing drilling chips and fines toward the mouth of the hole.
REFERENCES:
patent: 1169369 (1916-01-01), Wakfer
patent: 3163246 (1964-12-01), Vagins et al.
patent: 3187825 (1965-06-01), Bower, Jr.
patent: 3434554 (1969-03-01), Bower, Jr.
patent: 3807515 (1974-04-01), Evans
patent: 4043409 (1977-08-01), Walter
patent: 4099585 (1978-07-01), Emmerich
Emmerich Kenneth C.
Hamlin Ralston L.
Fansteel Inc.
Nichols Jr. Nick A.
Purser Ernest R.
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