Boring or penetrating the earth – Bit or bit element – Core forming type
Patent
1978-01-31
1979-10-09
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Core forming type
299 88, 299 91, 37142R, 172713, E21C 3518
Patent
active
041702670
ABSTRACT:
A tooth for a rotary drilling tool, more particularly an earth drill especially adapted for drilling in rocky soils is described including a working or cutting portion and a retaining portion; said working portion having at least one longitudinal edge provided with a rib extending up to the cutting edge of the tooth in order to receive a tungsten carbide tip, the thickness of the web portion of said working portion of the tooth being smaller than that of said ribbed edge; said web being substantially bevelled in longitudinal section, the junction between at least one face of the retaining portion of the tooth and the working portion forming a transverse rib which defines a transverse shoulder designed to cooperate with the front side of a tooth carrier of said tool.
REFERENCES:
patent: 1333852 (1920-03-01), Kittredge
patent: 2088807 (1937-08-01), Palo
patent: 2940191 (1960-06-01), Askue
patent: 3286378 (1966-11-01), Benetti
patent: 3286379 (1966-11-01), Benetti
patent: 3300883 (1967-01-01), Troeppl et al.
patent: 3426860 (1969-02-01), Petersen
patent: 3736676 (1973-06-01), Sturgeon
patent: 3841709 (1974-10-01), Kniff
patent: 3888028 (1975-06-01), White
patent: 4037337 (1977-07-01), Hemphill
Nichols Jr. Nick A.
Purser Ernest R.
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