Title:
【発明の名称】盛上げタップ
Document Type and Number:
Japanese Patent JP2880122
Kind Code:
B2
Abstract:
A reamer edge 16 is provided at a chamfer part 13 of a thread forming tap. When the tap is pulled out after the internal thread 22 is formed, a seam portion 23 present at the crest of the internal thread 22 is cut off whereby, even in a blind hole, formation of internal thread 22 and cutting of seam portion 23 are performed in a single process. The formation of the internal thread 22 and processing of inside diameter portion are thus achieved in a single process so that concentricity in ensured. Further, even if there is a deviation in the diameter of the hole 21 before threading, the inside of the internal thread 22 is processed to a constant value.
Inventors:
SAWABE TERUO
YOKOYAMA ISAO
SATO KAZUTOSHI
YOKOYAMA ISAO
SATO KAZUTOSHI
Application Number:
JP8355296A
Publication Date:
April 05, 1999
Filing Date:
April 05, 1996
Export Citation:
Assignee:
TANOI SEISAKUSHO KK
International Classes:
B23D77/00; B23G7/02; (IPC1-7): B23G7/02
Domestic Patent References:
| JP9216126A | ||||
| JP6350615U | ||||
| JP6341422U |
Attorney, Agent or Firm:
Toshiro Mitsuishi (2 outside)