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US 9,156,094 B2Granted
Step drill for wood
AssigneeIrwin Industrial Tool Company
InventorsLaVerne R. Durfee, Ryan F. Hall
Life of this patent
Estimating the term…
Abstract
A wood drill bit has a plurality of step sections where each step section has at least one flute that terminates in a cutting edge. The effective diameter of each of the plurality of step sections is different than the diameter of the other of the plurality of step sections such that a single bit may be used to bore holes in wood of different diameters.
Claims22
A wood drill bit comprising:
- a plurality of step sections, each of the plurality of step sections comprise at least one flute that defines a cutting edge having an effective diameter where the effective diameter of one of the plurality of step sections is different than the effective diameter of another one of the plurality of step sections wherein each of the plurality of step sections is preceded by a threaded portion.
A wood drill bit comprising:
- a plurality of step sections, each of the plurality of step sections comprise at least one flute that defines a cutting edge having an effective diameter where the effective diameter of one of the plurality of step sections is different than the effective diameter of another one of the plurality of step sections wherein each of the plurality of step sections is formed of a first material and a second material.
Dependencies are inferred from the claim text.