US PATENT SUBCLASS 72 / 99
.~.~.~ Using hyperboloidal roller

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}
95  DF  .~.~ And longitudinal movement of work {4}
99.~.~.~ Using hyperboloidal roller

DEFINITION

Classification: 72/99

Using hyperboloidal roller:

(under subclass 95) Subject matter including a roller*, the work-engaging surface of which describes a symmetric concave curve approximating a hyberbola when the roller is viewed as a cross-section taken along the axis of the roller.

(1) Note. An arc of a circle or ellipse, a parabola, or a similar symmetrical curved line is considered to approximate a hyperbola. The Figure accompanying this note illustrates a typical hyperboloidal roller. [figure]