US PATENT SUBCLASS 72 / 353.4
.~.~.~ Symmetrically expanding tools

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.~.~.~ Symmetrically expanding tools {1}
353.6  DF  .~.~.~.~> With tools converging to form annular surface; e.g., segments of closed die

DEFINITION

Classification: 72/353.4

Symmetrically expanding tools:

(under subclass 353.2) Subject matter wherein the first and second deforming instrumentalities are actuated to move equally apart, toward the work, and with respect to the closed die during the deforming operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

392+, for similar symmetrically expanding tools not in combination with a closed die.