US PATENT SUBCLASS 72 / 343
BY USE OF CLOSED-DIE AND COACTING WORK-FORCER (E.G., PUSH-DRAWING)

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

343BY USE OF CLOSED-DIE AND COACTING WORK-FORCER (E.G., PUSH-DRAWING) {3}
344  DF  .~> With stripping or ejecting from tool {1}
347  DF  .~> Cup or shell drawing (i.e., deep drawing) {2}
352  DF  .~> Forcing work into or within closed die; e.g., forging {6}

DEFINITION

Classification: 72/343

BY USE OF CLOSED DIE AND CO-ACTING WORK FORCER (E.G., PUSH-DRAWING):

(under the class definition) Subject matter comprising the use of a movable member and means to move, or guide the motion of, said member during an operation of the class type, said movable member being effective to forcibly propel or press work (a) into and through a work shape-imparting orifice*, or (b) into or within a passageway* or die cavity* having a closed perimeter definable in a plane normal to the

direction of motion of said member, the work being moved by said member to such an extent that at least a portion of the work has impressed therein or thereon a shape which is substantially congruent with the edge of said orifice or with some portion of said perimeter.

(1) Note. The term "movable" is used in a relative sense. Either, or both of, the work-forcer and the shape-imparting structure may be movable during the deforming operation, and the work forcer may also constitute a closed die*.

(2) Note. These subclasses (343) are the loci for original placement of all closed die apparatus and method patents, except those including an accompanying feature (such as cleaning, or lubrication, or cutting) provided for in preceding subclasses, or certain specific apparatus or techniques (such a metal deformation by pressurized fluid, or by extrusion) which have been selected for collection ahead of general "closed die" operations.

(3) Note. This subclass (343) is the residual locus for a method of, or apparatus for, metal deformation into and/or within an open-ended passageway, as distinguished from a closed bottom die cavity (e.g., pushing a rod or tube through a die to reduce its diameter, or die-forging an automobile valve head while providing an open-ended die passageway for the formation of a stem portion of unrestricted length). Some operations inaccurately called extrusion are properly classified in this subclass, wherein metal is not actually forced outwardly away from the die or past the most constricted portion of a passageway.

SEE OR SEARCH THIS CLASS, SUBCLASS:

61+, for the expansion of hollow work by fluid pressure within a die.

127+, for metal deformation by deflecting (e.g., bending, coiling, "skelping", or longitudinally troughing) bodily moving work, by passing it through a tool station which may include a closed die. 253.1+, for extrusion through an orifice.

274+, for rod-, tube-, or wire-drawing by pulling through a closed die.

293+, for metal deformation by use of a nondeforming clamp and relatively movable tool.

317, and 318, for a disclosure of closed die apparatus.

352+, for apparatus employing a closed die of the die cavity, or closed bottom type, as distinguished from a through die usable in extruding or wire-drawing.

467+, for closed die structure, per se.

SEE OR SEARCH CLASS

425, Plastic Article or Earthenware Shaping or Treating: Apparatus,

394+, for coacting shaping surfaces for reshaping nonmetallic preforms; and subclasses 406+ for press forming apparatus for nonmetallic fluent materials, see the search notes thereunder.