US PATENT SUBCLASS 72 / 253.1
BY EXTRUDING THROUGH ORIFICE

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


72 /   HD   METAL DEFORMING

253.1BY EXTRUDING THROUGH ORIFICE {15}
254  DF  .~> With cutting {1}
256  DF  .~> With metal-deforming other than by extrusion
257  DF  .~> With product handling
258  DF  .~> Expressing polymetallic-layered product
259  DF  .~> By plural impellers operating into one extrusion chamber
260  DF  .~> Expressing non-uniform cross-section or non-linear product
261  DF  .~> Expressing plural products
262  DF  .~> By rotating impeller means
263  DF  .~> Non-axial movement of die, ram, mandrel or container
264  DF  .~> Utilizing internal forming means (e.g., mandrel) or core tube (e.g., wire guide) {4}
270  DF  .~> Work supplying
271  DF  .~> Pressure or velocity conditioning
272  DF  .~> Container and/or support therefor
273  DF  .~> Ram or ram element
273.5  DF  .~> Indirect extrusion

DEFINITION

Classification: 72/253.1

BY EXTRUDING THROUGH ORIFICE:

(under the class definition) Subject matter comprising means for, or a step of using means for, squeezing metal by applied pressure through and out of a continuous periphery shape-imparting orifice* in an otherwise closed chamber (generally called a "container"), or past the most constricted section of a constricted passageway* leading from the otherwise closed chamber.

(1) Note. See Lines With Other Classes, Relationship to Combination Classes, With Assembling, of this class regarding assembly. The present subject matter is, as there pointed out, an exception to the general rule that assembly is excluded from this class. For instance, sheathing a cable by extruding metal around it is classified here, as in subclass 268.

(2) Note. Extruding through an orifice, as here defined, is also known as "die expressing" or "spurting".

(3) Note. Extrusion is one of the "closed die" operations (i.e., those employing a closed perimeter shape-imparting orifice, passageway, or closed cavity into and/or through which work is forced). Wire-drawing through a closed die is found in subclasses 274+. Residual closed die combinations such as "push-drawing", "shell-drawing", and "closed die forging" are in subclasses 343+.

(4) Note. Tool structures which are unique to extruding are classified in this and indented subclasses, e.g., bridge-mandrel-die means in subclass 269, containers in subclass 272, and rams in subclass 273. On the other hand, dies and mandrels, which by their nature are considered to be usable otherwise in metal deforming practice, are found with the residual tools in subclasses 462+.

SEE OR SEARCH THIS CLASS, SUBCLASS:

54+, for extrusion in which a fluent medium serves as the pressure tool means. 274+, and 343+, for operations other than extruding for forcing metal through an orifice or into a passageway.

467+, for an extrusion die, per se.

SEE OR SEARCH CLASS

65, Glass Manufacturing,

183, for apparatus to shape molten glass by extruding.

99, Foods and Beverages: Apparatus,

450.1, for apparatus for edible laminated product making, including an extrusion former and downstream laminating means.

100, Presses, for a press structure of general utility which is not provided for here or in some other class.

156, Adhesive Bonding and Miscellaneous Chemical Manufacture,

47, for a residual method of making (including sheathing) an

electrical conductor of indefinite length; and subclasses 244.11+ for a process of extruding combined with laminating downstream of the shaping zone.

164, Metal Founding, 451+, and 459+ processes of continuously casting metal; and subclasses 418+ for corresponding apparatus.

219, Electric Heating,

50+, and 602+ for electric heating of metal combined with its working.

264, Plastic and Nonmetallic Article Shaping or Treating: Processes,

176.1+, for a process of extruding nonmetallic plastic material not otherwise provided for.

419, Powder Metallurgy Processes, especially

41, for processes of forming articles from particulate material including metal particles, including forming a body of powder before sintering by extrusion followed by a heating step of effect sintering; and subclass 67 for similar processes where heat is not applied after the extrusion step.