Drill bit device

USRE28900E · kind E · reissue

Inventors

• John E. Byers · Helena, US
• Wells H. Claussen · Seattle, US

Key dates

• Filing date: Aug 26, 1974
• Grant date: Jul 13, 1976
• Expiry date: Aug 26, 1994

Classification

• Technology area (CPC —): General

Abstract

Drill bit construction having a removable lead screw and a body which has a conically shaped work facing surface. With generally triangularly shaped cut-away segments. Each of the segments has a cutting edge either in the form of a detachable blade or integrally formed into the body. The body itself is also detachably removable from the drill shaft or shank. In smaller diameter embodiments a spiral member recedes from the shaft adjacent the head for removing shaving as the bit proceeds through the wood.