Title: Earth boring auger

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Claims: We claim:

1. An earth boring auger, comprising

a shaft having means for connecting to a power source on one end thereof,

a flighting helically surrounding and secured to said shaft,

said flighting having a leading edge near the end of said shaft opposite said connecting means,

at least one cutter assembly including

a disc cutter and means for rotatively mounting said disc cutter for rolling cutting motion, and

means supporting said cutter assembly from said flighting near the drilling end of and spaced radially from said shaft a substantial distance behind the leading edge of said flighting and extending longitudinally beyond said flighting whereby said cutter engages the formation to be bored with a rolling cutting motion to cut a kerf therein prior to engagement of said flighting with said formation.

2. An earth boring auger according to claim 1, including

a second flighting helically surrounding and secured to said shaft and being 180.degree. opposite the other flighting with respect to said shaft,

a second cutter assembly including

a second disc cutter and means for rotatively mounting said second disc cutter, and

means supporting said second cutter assembly from said second flighting near the drilling end of shaft a substantial distance behind the leading edge of said second flighting whereby said second cutter engages the formation to be bored to cut a second kerf therein prior to engagement of said flightings with said formation.

3. An earth boring auger according to claim 2, including

a plurality of cutter assemblies positioned underneath each of said flightings.

4. An earth boring auger according to claim 3, wherein

each of said cutter assemblies has a different effective radial position with respect to said shaft.

5. An earth boring auger according to claim 1, wherein

the axis of rotation of said disc cutter does not pass through the axis of shaft.

Other info:

Inventors: Robbins, Leonard J. (Pottsboro, TX, US)
Stewart, Lloyd D. (Dennison, TX, US)

Application Number: 641041
Filing Date: 1975-12-15
Publication_date: 1976-12-21
Assignee: Reed Tool Company (Houston, TX)
Primary Class(es): 175/335 175/351, 175/394
Other Classes:
US Patent Ref:

850533	Apr, 1907	Litaker	175/335.
893950	Jul, 1908	Thomas	175/394.
1136203	Apr, 1915	Bardeen	175/336.
1640644	Aug, 1927	Bullum	175/394.
1719546	Jul, 1929	Hallett	175/394.
2380112	Jul, 1945	Kinnear	175/336.
2823025	Feb, 1958	Biedess	175/335.
3094179	Jun, 1963	Lines	175/394.
3905432	Sep, 1975	Mullins	175/394.

Other Refs:
Primary Examiner: Leppink, James A.
Assistant Examiner: Favreau, Richard E.
Attorney: Mosely; Neal J.