Stabilized tap with air release

Details Stabilized tap with air release Stabilized tap with air release

1990-07-26

1991-07-23

Combs, E. Michael

Cutting by use of rotating axially moving tool

Tool or tool with support

With pitch-stabilizing ridge

10141R, 408219, B23G 506

Patent

active

050339192

ABSTRACT:
The invention comprises means to align and stabilize taps prior to the commencement of the actual cutting of the threads and to release air while tapping. On the tap a constant diameter stabilizer is placed before the tapered chamfer section of the tap. This front portion is of a diameter slightly less than the inner diameter of the hole to be tapped. The front portion is inserted into the hole and acts to align the tap and avoid cross-threading of the tapped hole. To release air trapped in a blind hole, the flutes of the tap are extended through the stabilizer portion.

REFERENCES:
patent: 139651 (1873-06-01), Barthel
patent: 177731 (1876-05-01), Martin
patent: 689555 (1901-12-01), Mann et al.
patent: 896503 (1908-08-01), Zogg
patent: 1345425 (1920-07-01), Wells
patent: 2202236 (1940-05-01), Stimson
patent: 3313186 (1967-04-01), Rochon
patent: 4708542 (1987-11-01), Emmanuelli

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