Easy hold power auger

Details Easy hold power auger Easy hold power auger

2006-11-28

2006-11-28

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

C175S202000, C175S323000, C175S388000, C408S037000, C408S124000, C475S332000

Reexamination Certificate

active

07140456

ABSTRACT:
A cutting auger has a main auger blade and a front subsidiary coaxial blade each having a drive core and a helical auger flight carried on the drive core for rotation about a longitudinal axis of the drive core with a cutting edge at an axial end face of the auger flight, such that when rotated the cutting edge cuts a hole equal in diameter to the helical flight and the helical flight carries the cut material away from the cutting edge. The second auger blade having a smaller diameter than the first, is shorter than the first and is arranged with the helical turns thereof in opposed angular direction. A planetary drive system is arranged to rotate the first and second cutting augers in opposed direction with the first driven at a slower angular velocity than the second so as to balance the torque.

REFERENCES:
patent: 2148313 (1939-02-01), Williams
patent: 2250671 (1941-07-01), Joy
patent: 2261104 (1941-10-01), Birkigt
patent: 3572449 (1971-03-01), Brocas et al.
patent: 4819744 (1989-04-01), Caswell
patent: 4947943 (1990-08-01), Litwak
patent: 5038870 (1991-08-01), Kuronen

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