US PATENT SUBCLASS 72 / 353.6
.~.~.~.~ With tools converging to form annular surface; e.g., segments of closed die

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

343  DF  BY USE OF CLOSED-DIE AND COACTING WORK-FORCER (E.G., PUSH-DRAWING) {3}
352  DF  .~ Forcing work into or within closed die; e.g., forging {6}
353.2  DF  .~.~ By two or more coacting tools movable relative to closed die; e.g., tool complex {3}
353.4  DF  .~.~.~ Symmetrically expanding tools {1}
353.6.~.~.~.~ With tools converging to form annular surface; e.g., segments of closed die

DEFINITION

Classification: 72/353.6

With tools converging to form annular surface; e.g., segments of closed die:

(under subclass 353.4) Subject matter wherein the closed die is comprised of a plurality of portions each covering an arc of the periphery thereof, which portions are movable radially with respect to each other, but not during metal deformation; or (2) including a closed die and including a plurality of components, each having a work engaging arcuate surface, wherein the components move simultaneously together to give the work a continuous circular surface.

(1) Note. The "portions" of the closed die of clause (1) this subclass are not in motion during the deforming operation. Commonly the purpose of being segmented is to allow removal thereof from the formed product.

SEE OR SEARCH THIS CLASS, SUBCLASS:

402, for peripherally spaced tools that move radially inwardly to effect a metal deforming operation, even if the tools mutually form an annular shaping surface at their radially innermost position, but do not comprise a "closed die."