US PATENT SUBCLASS 72 / 274
BY PULLING WORKPIECE THROUGH CLOSED PERIPHERY DIE (E.G., ROD-, TUBE-, OR WIRE-DRAWING)

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

274BY PULLING WORKPIECE THROUGH CLOSED PERIPHERY DIE (E.G., ROD-, TUBE-, OR WIRE-DRAWING) {8}
275  DF  .~> With cutting
276  DF  .~> Producing a non-uniform product
277  DF  .~> With movement of discrete workpiece angularly, laterally, or in a reverse direction
278  DF  .~> Utilizing plural metal-deforming tools {5}
284  DF  .~> And applying a "pushing" force
285  DF  .~> Movable die
286  DF  .~> With heating or cooling
287  DF  .~> Utilizing specified work moving means {4}

DEFINITION

Classification: 72/274

BY PULLING WORKPIECE THROUGH CLOSED PERIPHERY DIE (E.G., ROD-, TUBE-, OR WIRE-DRAWING):

(under the class definition) Subject matter comprising means including, or a step of using means including, an orifice* and/or passageway*, through which work is drawn by the application of external tensile force.

(1) Note. Apparatus of this subclass, and the indented subclasses, is usually intended to operate upon work having an initial dimension that is only slightly larger than the opening in the closed die to reduce the cross-sectional area of the work, with or without altering the basic cross-sectional shape thereof.

(2) Note. In regard to the underlined portions of (1) Note, immediately above, note that subclasses 127+ provides for alteration of cross-sectional shape of travelling work (e.g., troughing subclasses 176+) which may also be accomplished by pulling through a closed die.

(3) Note. For the purpose of patent placement in subclass 274, and the subclasses indented thereunder, a work gripping and/or moving means will be treated in accordance with the criteria set forth in (1) Note under the definition of subclass 276.

SEE OR SEARCH THIS CLASS, SUBCLASS:

64, for subject matter in the "twisting" area which may also utilize a closed periphery die.

127, for "skelping", or longitudinally troughing, a bodily moving workpiece by using a closed periphery die without reducing the cross-sectional area of the strip or "skelp".

293, for metal deformation by a stationary nondeforming work-gripping claim and movable closed periphery die. 343+, for metal deformation by a closed die(s) moved along a stationary workpiece, and/or for push-drawing, i.e., altering the cross-sectional area of a rod or tube by pushing it through a closed die.