US PATENT SUBCLASS 72 / 321
.~.~.~.~ Curved die surface

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  DF  .~.~.~ With die surface extension on clamp {1}
321.~.~.~.~ Curved die surface

DEFINITION

Classification: 72/321

Curved die surface:

(under subclass 320) Subject matter wherein said work-shape-imparting surface comprises at least one arcuate or nonplanar portion.

(1) Note. A device of this subclass may be employed to bend pipe about a fixed radius forming block, or to form a sheet metal cornice molding, where other than a simple sharp angle bend is desired.

(2) Note. This subclass contains disclosures of some metal sheet folders which function to bend the sheet double about a thin wedge or plate extending from a clamp jaw. It is presumed, in the absence of detailed disclosure, that the folding edge is rounded to some extent, to avoid cracking or cutting the work. [figure] [caption]Pivoting tool coacting with curved die surface extension on passive clamp (subclass 321)