Screw having a V-shaped groove profile for cooperating with a pinion in a compression or expansion machine
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United States of America Patent
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Aug 3, 1982
Issued Date -
N/A
app pub date -
Dec 5, 1979
filing date -
Jun 2, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tool having only an end cutting-edge carries out a first movement of penetration into a screw blank so as to produce a groove having flanks substantially parallel to the pinion axis. The tool-holder is angularly displaced with respect to the spindle which carries the screw blank. A second movement of tool penetration takes place while the relative displacement is progressively reduced in order to obtain an inclined flank which produces a V-shaped profile. The screw is intended to form part of a compression and expansion machine and to cooperate with at least one pinion having V-form teeth.
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