Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent
1981-04-17
1983-04-19
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Bit with leading portion forming smaller diameter initial bore
175394, 175413, E21B 1044
Patent
active
043802710
ABSTRACT:
An auger system is described having an upstanding axial stem with a pilot bit attached to the bottom of the stem. A downwardly spiraling flight structure affixed to the axial stem has a leading edge terminating in the vicinity of the pilot bit. Enhanced cutting operations are provided by way of a cutting tooth holder structure removably secured to the leading edge of the flight structure and extending from a position adjacent the stem above the pilot bit to a position proximate to the perimeter of the flight structure. The holder structure is provided with a plurality of spaced apart pockets for receiving shank portions of cutting teeth. Stresses applied to the cutting teeth during operations are distributed through the holder structure back to the flight structure by way of reinforcing webs which extend from a position proximate to each of the cutting tooth receiving pockets to a position for contact with the leading edge of the flight structure.
An improved rock cutting tooth is described having a principle cutting segment and a second segment which provides for reduced wear of the body of the tooth adjacent the first or principle cutting segment in order to reduce wear and thereby prevent the first cutting segment from breaking loose during cutting operation by reason of rapid erosion of the body portion.
REFERENCES:
patent: 3024856 (1962-03-01), Henning
patent: 3106973 (1963-10-01), Christensen
patent: 3235018 (1966-02-01), Troeppl
patent: 3794129 (1974-02-01), Taylor
Baker Donald R.
Barr Thomas R.
Smith, Jr. Paul C.
Blue Streak Industries, Inc.
Dang Hoang C.
Leppink James A.
Scherback W. J.
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