US 8,784,017 B2 · Drill bit

Abstract

A drill bit for a boring tool comprises a shank configured for engagement with the boring tool and a working tip having a first end attached to the shank and an opposite second end, and a conical helical thread extending substantially continuously from end to end. The thread root may include a rounded portion while the crest may be flat. The configuration of the helical thread, such as the crest width, thread depth, thread angle, cross sectional area and base width are adjusted as a function of the length of the threaded working tip to maximize bending strength and optimize thread wear and operability.

Claims18

Dependent claims

A drill bit for a boring tool comprising:

a shank configured for engagement with the boring tool;
and
a threaded working tip having a first end attached to said shank and an opposite second end, said working tip including a helical thread extending substantially continuously from said first end to said second end, said helical thread having a root including a rounded portion defined at a radius, wherein said rounded portion of said root is interrupted by a flat portion interposed in said rounded portion.

Dependencies are inferred from the claim text.

Drill bit

Life of this patent

Drill bit

Life of this patent

Abstract

Claims18