US PATENT SUBCLASS 72 / 283
.~.~ Including a mandrel inserted within a hollow workpiece

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

274  DF  BY PULLING WORKPIECE THROUGH CLOSED PERIPHERY DIE (E.G., ROD-, TUBE-, OR WIRE-DRAWING) {8}
278  DF  .~ Utilizing plural metal-deforming tools {5}
283.~.~ Including a mandrel inserted within a hollow workpiece

DEFINITION

Classification: 72/283

Including a mandrel inserted within a hollow workpiece:

(under subclass 278) Subject matter including an internal die (male die, punch, push-rod, etc.) which is positioned inside a generally-tubular workpiece, at least a portion of said internal die entering a portion of the orifice or passageway, so that said internal die determines at least some internal dimension of the tubular workpiece.

SEE OR SEARCH THIS CLASS, SUBCLASS:

253.1+, and 343+, for a combination including die and mandrel units in the extruding and in the residual closed die operations, respectively.