US PATENT SUBCLASS 72 / 136
.~.~ Including thinning of helical portion of work section

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
136.~.~ Including thinning of helical portion of work section

DEFINITION

Classification: 72/136

Including thinning of helical portion of work section:

(under subclass 135) Subject matter wherein the instrumentality comprises two elements: (a) having work-engaging surfaces extending transversely across the direction of movement of the work, and (b) engaging opposite faces of the work, and in which as claimed or disclosed, the distance between the work-engaging surfaces is less at one side margin of the work than at the other side margin thereof, and also less than the original work thickness.

(1) Note. Usually a deflector* of this class (72) includes a member inclined to the direction of travel of moving work, which member engages a side to divert the work into a coil. In this subclass (136) the coiling is the result of the work being squeezed between two pressure surfaces (e.g., rollers, hammers, etc.), between which the work passes. The squeezing of one side margin elongates the squeezed margin with respect to the other margin, thereby effectively causing a deflection out of the course of work movement. See the Figure accompanying this note for illustration of pressure surfaces comprising rollers*. [figure]

SEE OR SEARCH THIS CLASS, SUBCLASS:

167, for similar structure wherein the work is merely curved as distinguished from coiled.

SEE OR SEARCH CLASS

428, Stock Material or Miscellaneous Articles,

592, for metallic stock which is helical or has a helical component.