US PATENT SUBCLASS 72 / 97
.~.~.~.~ Including work-piercing or work-expanding plug

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}
96  DF  .~.~.~ Using external rotating tool and internal core {1}
97.~.~.~.~ Including work-piercing or work-expanding plug

DEFINITION

Classification: 72/97

Including work-piercing or work-expanding plug:

(under subclass 96) Subject matter wherein the first tool is provided with a portion that is, according to the total disclosure, particularly adapted to create an opening in the material (i.e., make the material hollow) or to enlarge an existing opening in the material during operation.