Method and apparatus for boring through a solid material

Boring or penetrating the earth – With tool shaft detail

Reexamination Certificate

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Details

Reexamination Certificate

active

06892831

ABSTRACT:
A rotary drill bit for drilling a hole through a solid body is disclosed. The drill bit includes a collar and a penetrating member. At a proximal end, the collar is attachable to a drill shaft. At a distal end, the collar is attachable to the penetrating member. The penetrating member has a connecting end for attachment to the collar and a cutting end for engaging the solid body. A pilot drill is fixedly attached to the cutting end for initiating contact with the solid body.

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McMaster-Carr Supply Company-Catalog 99 (“Wood Boring Bits Deep-Hole Power Auger Bits”, pp. 1837-1842.).

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