US PATENT SUBCLASS 72 / 142
.~.~ By work-guide and rotatable, work-holding core

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}
135  DF  .~ To form helical coil or tube {7}
142.~.~ By work-guide and rotatable, work-holding core {2}
143  DF  .~.~.~> And means to change pitch of coil
144  DF  .~.~.~> And means to traverse work-guide

DEFINITION

Classification: 72/142

By work guide and rotatable work-holding core:

(under subclass 135) Subject matter wherein the instrumentality comprises: (a) an arbor having claimed or disclosed means thereon, or cooperating therewith, for temporarily securing the work relatively thereto; and (b) means adjacent to, and cooperating with, the arbor and directing the work to or towards the peripheral surface of the arbor in which the arbor turns about its central axis.

(1) Note. Patents in this and indented subclasses disclose the pitch adder as an arrangement wherein the core (i.e., the arbor of (a) above) and the work-guide (i.e., the work-directing means of (b) above) are relatively movable. Pitch is added to the product by moving the core along its axis or by traversing the work-guide along a line parallel to the axis; see subclass 144 indented hereunder for the traversable work-guide.