Invention Grant
- Patent Title: Spade bit
- Patent Title (中): 锹头
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Application No.: US13036631Application Date: 2011-02-28
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Publication No.: US08147174B2Publication Date: 2012-04-03
- Inventor: Laverne R. Durfee
- Applicant: Laverne R. Durfee
- Applicant Address: US NC Huntersville
- Assignee: Irwin Industrial Tool Company
- Current Assignee: Irwin Industrial Tool Company
- Current Assignee Address: US NC Huntersville
- Agency: Moore & Van Allen, PLLC
- Agent Dennis J. Williamson
- Main IPC: B27G15/00
- IPC: B27G15/00

Abstract:
The drill bit comprises a cutting blade formed at one end of a shank. The cutting blade has a pair of cutting shoulders that extend inwardly from the outer sides of the blade toward the bit axis. A tip having converging sides that create a point extends from the shoulders. The cutting edge of each shoulder is beveled with respect to the plane of the face of the blade. A flute is provided on the leading portion of each blade face adjacent the cutting edges. Each flute is a smooth curve that creates a substantially uninterrupted recess on each face of the blade that facilitates chip removal, increases the drill rate and lowers the power required to drill a hole. A non-stick coating may be applied to the blade to further facilitate chip removal.
Public/Granted literature
- US20110150588A1 SPADE BIT Public/Granted day:2011-06-23
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