NONAXISYMMETRICAL BLADE DRILL - NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY

Title:

NONAXISYMMETRICAL BLADE DRILL

Document Type and Number:

WIPO Patent Application WO/2007/097474

Kind Code:

A1

Abstract:

A drill capable of providing a cut hole high in circularity. The drill is characterized in that a chisel portion is formed at the center of the tip end of the drill so that the drill shaft center and the center of the chisel portion overlap each other, at least one cutting blade out of a plurality of cutting blades and another cutting blade are disposed non-symmetrically with respect to the drill shaft center as the center axis, and the outer edges of the drill blades form arcs of a circle around the drill shaft center.

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Inventors:

NISHIWAKI, Nobuhiko (3-8-1 Harumi-ch, Fuchu-shi Tokyo, 183-8538, JP)
西脇信彦 (〒38 東京都府中市晴見町３－８－１国立大学法人東京農工大学内 Tokyo, 183-8538, JP)

Application Number:

JP2007/053992

Publication Date:

August 30, 2007

Filing Date:

February 23, 2007

Export Citation:

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Assignee:

NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY (3-8-1, Harumi-cho Fuchu-shi, Tokyo, 183-8538, JP)
国立大学法人東京農工大学 (〒38 東京都府中市晴見町３－８－１ Tokyo, 183-8538, JP)
NISHIWAKI, Nobuhiko (3-8-1 Harumi-ch, Fuchu-shi Tokyo, 183-8538, JP)

International Classes:

B23B51/00

Attorney, Agent or Firm:

HIRAISHI, Toshiko (1-18-15, Nishi-Shinbashi Minato-ku, Tokyo, 105-0003, JP)

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