US PATENT SUBCLASS 72 / 138
.~.~ By use of means acting by and during machine operation to form coil of irregular pitch and/or diameter

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}
138.~.~ By use of means acting by and during machine operation to form coil of irregular pitch and/or diameter {1}
139  DF  .~.~.~> Including non-cylindrical core

DEFINITION

Classification: 72/138

By use of means acting by and during machine operation to form coil of irregular pitch and/or diameter:

(under subclass 135) Subject matter including use of means to

produce a coil that is not uniform as to its helix angle (i.e., pitch) or its radius of arc (i.e., diameter) or both, which means is driven from the same power source that causes deflection of the work into a coil, and operates while the deformation occurs.

(1) Note. The structure defined facilitates the production of a helical coil in other than regular cylindrical form. The coil shown in the Figure accompanying this note is the result of changing the radius of bending during manufacture. [figure]

(2) Note. Also placed in this or indented subclasses would be a disclosure of a machine for producing a coil of nonuniform pitch or nonuniform diameter (e.g., an "hour-glass" configured bed spring), or a machine for varying the radius of the coil convolutions as the coil is being produced.

SEE OR SEARCH THIS CLASS, SUBCLASS:

140, and 143, for means for adjusting an instrumentality to produce coils of different pitch and/or diameter.