Cutting by use of rotating axially moving tool – Tool or tool with support – With pitch-stabilizing ridge
Patent
1989-03-24
1991-08-06
Schwartz, Larry I.
Cutting by use of rotating axially moving tool
Tool or tool with support
With pitch-stabilizing ridge
408226, 10141R, B23G 506
Patent
active
050372513
ABSTRACT:
The present invention relates to an improved thread-tapping device which permits both conventional and non-conventional driving means to be used to drive the tap to form threads in a hole. The improved thread tap has a conventional set of flats arranged in a square configuration with each flat being spaced about the circumference of the shank at approximately 90 degrees with respect to one another. This first set of flats extends longitudinally at or about a free end of the shank of the thread tap in the direction of the cutting portion of the thread tap. Positioned between this first set and the cutting portion is a second mounting section which has a plurality of flats divisible by three. This second set of flats is circumferentially spaced about the shank of the thread tap and longitudinally extends from about the terminus of the first set in the direction of the cutting portion. The first set of flats is conventional and can be mounted within a conventional tap driving device. The second set of flats is arranged to receive and be clamped within a non-conventional tap driving device.
REFERENCES:
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patent: 4703677 (1987-11-01), Rossini
Drilling Technology, S. F. Krar and J. W. Oswald, 1977, p. 127.
Gossett Dykema
Schultz Robert
Schwartz Larry I.
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