Tap with relief
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United States of America Patent
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Jul 7, 1992
Issued Date -
N/A
app pub date -
Aug 22, 1991
filing date -
Jan 19, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is a tap whose thread portion 2 forms a cutting section 5 and a guiding section 6 and is provided on a plurality of adjacent thread teeth of the cutting section 5 with a relief 8. It is desirable that a further machining measure be provided for the tap whereby favorable compromises can be obtained with respect to guidance and friction. This is achieved in that the relief 8 of the adjacent cutting-section 5 thread teeth--seen in a longitudinal direction--have a clearance angle which varies increasingly or decreasingly. Varying the relief enables the requirements with respect to avoiding incorrect tapping and avoiding friction-generated cold welding to be met and matched up in an improved manner.
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