US PATENT SUBCLASS 72 / 103
.~.~.~ Having helical groove

Current as of: June, 1999
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72 /   HD   METAL DEFORMING

67  DF  BY USE OF TOOL ACTING DURING RELATIVE ROTATION BETWEEN TOOL AND WORK ABOUT INTERNAL CENTER (E.G., GYRATING OR ROTATING TOOL) {10}
80  DF  .~ During rotation of work {12}
102  DF  .~.~ Using non-cylindrical rotating tool {5}
103.~.~.~ Having helical groove {1}
104  DF  .~.~.~.~> With cooperating tool rotating in same direction

DEFINITION

Classification: 72/103

Having helical groove:

(under subclass 102) Subject matter wherein the work-engaging surface of the tool is provided with a receding irregularity that could be traced by a point that runs continuously round and round the tool axis while constantly moving in one direction along the axis.