US PATENT SUBCLASS 72 / 150
.~.~ With core inside hollow workpiece

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

127  DF  BY DEFLECTING SUCCESSIVELY-PRESENTED PORTIONS OF WORK DURING BODILY MOVEMENT THEREOF (E.G., FOR COILING, LEVELLING, CURVING OR TROUGHING MATERIAL IN MOVEMENT) {11}
149  DF  .~ By use of work-contacting wiper and moving, work-holding form {9}
150.~.~ With core inside hollow workpiece

DEFINITION

Classification: 72/150

With core inside hollow workpiece:

(under subclass 149) Subject matter including a member that substantially contacts all of the interior periphery of that section of hollow work* that is engaged by the deforming instrumentality.

(1) Note. The core disclosed in the patents in this subclass usually functions to prevent undesired distortions in tubular work during the bending thereof.