US PATENT SUBCLASS 72 / 91
.~.~ Caused by rotating tool and opposing concave surface

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}
91.~.~ Caused by rotating tool and opposing concave surface {1}
92  DF  .~.~.~> Non-rotating concave surface {1}

DEFINITION

Classification: 72/91

Causes by rotating tool and opposing concave surface:

(under subclass 80) Subject matter wherein the work lies between two tools, a first of which is a roller-like tool*, and a second of which tools has a non-planar work-engaging face that is curved about one or more centerlines adjacent and parallel to the axis of the first tool, so as to form a space of varying magnitude between the two tools.