US PATENT SUBCLASS 72 / 264
.~ Utilizing internal forming means (e.g., mandrel) or core tube (e.g., wire guide)

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

253.1  DF  BY EXTRUDING THROUGH ORIFICE {15}
264.~ Utilizing internal forming means (e.g., mandrel) or core tube (e.g., wire guide) {4}
265  DF  .~.~> Movable longitudinally in ram
266  DF  .~.~> Integral with ram {1}
268  DF  .~.~> Core tube
269  DF  .~.~> Bridge mandrel

DEFINITION

Classification: 72/264

Utilizing internal-forming means (e.g., mandrel) or core tube (e.g., wire guide):

(under subclass 253.1) Method or means utilizing or including a member which projects axially into or adjacent to, but in either case is spaced from the wall of, the extrusion orifice or passageway and cooperates therewith to provide a cored annular orifice through which a generally tubular product may be extruded, the interior configuration of the product corresponding to the outer configuration of the member.

(1) Note. The member is generally known in the extrusion art as a "mandrel". If it constitutes a tubular core guide means, as defined under subclass 268 below, it is generally called a "core tube".

SEE OR SEARCH THIS CLASS, SUBCLASS:

462+, for a mandrel structure, per se.