Title:
CUT TAP
Document Type and Number:
WIPO Patent Application WO/2013/124981
Kind Code:
A1
Abstract:
A cut tap is provided which is able to form high-precision threading safely. The cut tap has a biting section (1) comprising a plurality of threads (10) formed so that the outer diameter of the threads becomes smaller moving forward in the axial direction and a complete thread section (2) comprising a plurality of threads (20) having a constant outer diameter in the axial direction. In this cut tap, the complete thread section (2) comprises a valley floor same-diameter section (2A) of threads (20A) whose effective diameter (d2) and valley diameter (d1) relative to the threads (10) of the biting section (1) are the same, and a valley floor large-diameter section (2B) provided continuously to the rear of the valley floor same-diameter section (2A) in the axial direction whose threads (20B) have an effective diameter (d2) that is the same as the threads (10) of the biting section (1) but have a valley diameter (d1') that is larger. The cutting edge (6) is formed in the valley floor portion of the valley floor large-diameter section (2B) on the forward edge in the direction of rotation.
Inventors:
HACHIUMA YOSHIO (JP)
YAMAGUCHI HITOSHI (JP)
YAMAGUCHI HITOSHI (JP)
Application Number:
PCT/JP2012/054254
Publication Date:
August 29, 2013
Filing Date:
February 22, 2012
Export Citation:
Assignee:
SAKAI THREADING TOOL CO LTD (JP)
HACHIUMA YOSHIO (JP)
YAMAGUCHI HITOSHI (JP)
HACHIUMA YOSHIO (JP)
YAMAGUCHI HITOSHI (JP)
International Classes:
B23G5/06
Foreign References:
| JPH01148229U | 1989-10-13 | |||
| JPS61124332U | 1986-08-05 | |||
| JP2012061577A | 2012-03-29 |
Attorney, Agent or Firm:
KAMADA Bunji et al. (JP)
Bunji Kamata (JP)
Bunji Kamata (JP)
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Claims: