Thread forming tap

Details Thread forming tap Thread forming tap

1996-09-26

1998-08-25

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

With pitch-stabilizing ridge

408215, 408219, 470198, B23B 5100

Patent

active

057977100

ABSTRACT:
A tap having a reamer edge which is provided at a chamfer part, so that when the thread forming tap is pulled out after the internal thread is formed, a seam portion present at the crest of the internal thread is cut off, whereby even in a blind hole, formation of internal thread and cutting of the seam portion are performed in a single process, and formation of an internal thread and processing of an inside diameter portion are achieved in a single process to obtain concentricity in line with each other. Further, even if there is a deviation in diameter of the hole before threading, the inside of the internal thread is processed to a constant value.

REFERENCES:
patent: 1718536 (1929-06-01), Dalzen
patent: 1968103 (1934-07-01), Thomson
patent: 2058351 (1936-10-01), Pruitt
patent: 2379908 (1945-07-01), Johnson
patent: 3067509 (1962-12-01), Welles
patent: 3097426 (1963-07-01), Hill
patent: 3245099 (1966-04-01), Zagar
patent: 4539832 (1985-09-01), Koller
patent: 5562371 (1996-10-01), Reed
patent: 5664915 (1997-09-01), Hawke

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