US PATENT SUBCLASS 72 / 143
.~.~.~ And means to change pitch of coil

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  DF  .~.~ By work-guide and rotatable, work-holding core {2}
143.~.~.~ And means to change pitch of coil

DEFINITION

Classification: 72/143

Add means to change pitch of coil:

(under subclass 142) Subject matter including means for altering the effect of the pitch adder on the successive work portions, whereby the pitch of the produced coil is altered.

(1) Note. For discussion of "pitch" see the definition of coil* in the Glossary of this class.

(2) Note. Included in this subclass are patents disclosing means for moving the core and/or the work guide relatively along, or parallel to, the core axis, and means for changing the relative movement. The change is made while the instrumentality is not operating.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138, for a disclosure of adjustment of pitch and/or diameter during machine operation, and see (2) Note above.