Pilot bit

Details Pilot bit Pilot bit

1995-03-20

1995-12-19

Neuder, William P.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175391, E21B 1044

Patent

active

054761492

ABSTRACT:
A pilot bit is provided with an elongated body member and three blades that extend radially from and spirally along the body member. As compared to conventional two bladed pilot bits, the outer edge and leading tip of the third blade removes additional spoil which increases penetration rates. The pilot bit also includes an adapter which is inserted in an auger shaft and releasably secured thereto with a fastener, such as a bolt. The adapter includes a surface that cooperates with a key that is secured to the auger shaft to take the torque load off the bolt. In this manner, deformation of the auger shaft bolt holes and bolt fatigue is minimized.

REFERENCES:
patent: 2773673 (1956-12-01), Petersen
patent: 3508622 (1970-04-01), Benetti et al.
patent: 4623025 (1986-11-01), Verstraeten

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