Title:
SPIRAL STEEL, APPLICATION PRODUCT OF SAME, AND METHOD FOR MANUFACTURING SPIRAL STEEL
Document Type and Number:
WIPO Patent Application WO/2012/014840
Kind Code:
A1
Abstract:
The purpose of the invention is to provide a spiral steel having a high mechanical strength and being capable of easily narrowing the pitch interval of a twisted portion (spiral blade portion) even without changing a twist angle and also to provide an application product of the spiral steel and a method for manufacturing the spiral steel.
The spiral steel is formed in such a way that steels (f1 to f4) having, as a center axis, an axis parallel with the longitudinal direction of the steels and having a shape including at least three or more long side members disposed radially with respect to the center axis are twisted along the center axis.
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Inventors:
GOTO Tsuneo (3107-5, Suya Koshi-sh, Kumamoto 02, 〒8611102, JP)
Application Number:
JP2011/066848
Publication Date:
February 02, 2012
Filing Date:
July 25, 2011
Export Citation:
Assignee:
GOTO Tsuneo (3107-5, Suya Koshi-sh, Kumamoto 02, 〒8611102, JP)
International Classes:
B21D11/14; E02D5/56; E02D17/20; E02D27/42; F28F9/24; F28F13/12
Attorney, Agent or Firm:
TAMURA Chikashi et al. (4F Houmei Bldg. 1-3-19, AkasakaMinato-k, Tokyo 52, 〒1070052, JP)
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Claims:
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