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Title:
THREAD FORMING TAP WITH INSIDE DIAMETER FINISHING TOOTH
Document Type and Number:
WIPO Patent Application WO/2011/086675
Kind Code:
A1
Abstract:
A groove (42) in which an inside diameter finishing tooth (40) is provided is located in the center of roll off (22) at three points between a plurality of rows of protrusions (20a-20f) in the chamfer (24) around the central axis (O), and the inside diameter finishing tooth (40) is provided at a position shifted by a predetermined angle (θ) in the rotational direction (A) of a tap from the protrusions (20a, 20c, 20e) in the chamfer (24) at the edge of opening of the groove (42) on the side opposite to the rotational direction (A) of the tap. Consequently, an internally threaded screw (54) can be formed by plastically deforming the inner circumferential surface (52) of a prepared hole by using the plurality of rows of protrusions (20a-20f) in the chamfer (24) entirely, and the number of the protrusions (20a-20f) pertaining to thread formation of the internally threaded screw (54) increases. Since the load (deformation margin of plastic deformation) per one protrusion (20a-20f) decreases, excellent durability can be attained without increasing the axial dimension of the chamfer (24).

Inventors:
OHHASHI Seiji (149 Miyamae, Ichinomiya-cho, Toyokawa-sh, Aichi 31, 〒4411231, JP)
大橋 誠司 (〒31 愛知県豊川市一宮町宮前149 オーエスジー株式会社内 Aichi, 〒4411231, JP)
MATSUMOTO Katsuya (149 Miyamae, Ichinomiya-cho, Toyokawa-sh, Aichi 31, 〒4411231, JP)
Application Number:
JP2010/050292
Publication Date:
July 21, 2011
Filing Date:
January 13, 2010
Export Citation:
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Assignee:
OSG CORPORATION (22 Honnogahara 3-chome, Toyokawa-shi Aichi, 05, 〒4420005, JP)
オーエスジー株式会社 (〒05 愛知県豊川市本野ヶ原三丁目22番地 Aichi, 〒4420005, JP)
OHHASHI Seiji (149 Miyamae, Ichinomiya-cho, Toyokawa-sh, Aichi 31, 〒4411231, JP)
大橋 誠司 (〒31 愛知県豊川市一宮町宮前149 オーエスジー株式会社内 Aichi, 〒4411231, JP)
International Classes:
B23G5/06
Foreign References:
JPH1119825A
JPH09216126A
Attorney, Agent or Firm:
IKEDA Haruyuki (Ikeda Patent Office, Nagoya-Dia. Bldg. No.2, 15-1, Meieki 3-chome, Nakamura-ku, Nagoya-sh, Aichi 02, 〒4500002, JP)
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Claims: