US PATENT SUBCLASS 28 / 238
.~.~.~.~.~.~ By internally threaded surface

Current as of: June, 1999
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28 /   HD   TEXTILES: MANUFACTURING

217  DF  THREAD FINISHING {4}
219  DF  .~ Surface modification of running length {5}
222  DF  .~.~ Clearing {4}
226  DF  .~.~.~ Clamping, severing or shearing {5}
232  DF  .~.~.~.~ By opposed, gap defining surfaces, e.g., stripping guide {3}
235  DF  .~.~.~.~.~ Adjustable slot forming surface {3}
238.~.~.~.~.~.~ By internally threaded surface

DEFINITION

Classification: 28/238

(under subclass 235) Method or apparatus wherein a screw-like member is provided which coacts with a bore having a helical ridge formed therein to effect or allow movement of the passage defining surfaces to thereby alter passage width.