US PATENT SUBCLASS 72 / 320
.~.~.~ With die surface extension on clamp

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

293  DF  BY USE OF NON-DEFORMING WORK-GRIPPING CLAMP AND RELATIVELY MOVABLE CLAMP, TOOL OR WORK-FORCER {9}
316  DF  .~ Clamp structure constitutes sole initial metal-deforming force-reaction means (i.e., is passive tool) {4}
319  DF  .~.~ With pivotal tool (e.g., sheet metal bender) {1}
320.~.~.~ With die surface extension on clamp {1}
321  DF  .~.~.~.~> Curved die surface

DEFINITION

Classification: 72/320

With die surface extending from clamp jaw:

(under subclass 319) Subject matter utilizing an element integral with or rigidly attached to a jaw of said work-gripping instrumentality, said element having a work-shape-imparting surface which is designed and intended to be engaged by, and to restrain movement of, portions of work at some time during an operation of the class type, said surface being nonplanar and/or offset or inclined with respect to the work-engaging face of said jaw.

(1) Note. A flat surface extending from a clamp jaw and initially contacted by work, so that it serves mainly or entirely as a support and has little or no shaping function, is not regarded as a "die surface" for this subclass; see DIE* in the Glossary. A press bed on which work is held down by clamping fixtures would usually constitute a passive M.D. tool for subclass 316.

(2) Note. A bevelled or rounded edge on a clamp jaw, unless it has a disclosed shaping function, is not regarded as a die surface. Many clamps are cut away or bevelled merely for clearance purposes, in such devices as sheet metal bending

brakes, pipe benders, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

322+, for a work clamp having die surface extension, combined with active metal-deforming tool having other than pivotal motion.

462+, for a metal-deforming tool of specific configuration.