Title:
TAPER THREAD-CUTTING SPIRAL PIPE TAP
Document Type and Number:
WIPO Patent Application WO/2017/154121
Kind Code:
A1
Abstract:
Provided is a taper thread-cutting spiral pipe tap for which the occurrence, in the female thread, of gouges and cutting edge marks when tap rotation is stopped is limited. The taper thread-cutting spiral pipe tap 10 has four helical grooves 20. The cutting edge 24 located every specified number of the multiple cutting edges 24, which are located successively along the succession of thread crests 18 of the complete thread section 14, is removed. As a result, it is possible to obtain a taper thread-cutting spiral pipe tap 10 for which the occurrence of gouges of the inner circumferential surface of a tapered female pipe thread, the occurrence of chip clogging, and the occurrence of cutting edge 24 marks when tap rotation is stopped are limited.
Inventors:
NAKAJIMA TAKAYUKI (JP)
SAITOH KOHICHI (JP)
SAITOH KOHICHI (JP)
Application Number:
PCT/JP2016/057245
Publication Date:
September 14, 2017
Filing Date:
March 08, 2016
Export Citation:
Assignee:
OSG CORP (JP)
International Classes:
B23G5/06
Foreign References:
| JPH03100021U | 1991-10-18 | |||
| JPH0760546A | 1995-03-07 | |||
| JPS5288899A | 1977-07-25 | |||
| JPS6426128U | 1989-02-14 | |||
| JP3162994U | 2010-09-24 | |||
| US20080075550A1 | 2008-03-27 |
Other References:
See also references of EP 3427881A4
Attorney, Agent or Firm:
IKEDA Haruyuki et al. (JP)
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