US PATENT SUBCLASS 57 / 341
.~.~.~ Having a frictional tube, or a twisting head therefor, through which yarn passes

Current as of: June, 1999
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57 /   HD   TEXTILES: SPINNING, TWISTING, AND TWINING

1 R  DF  APPARATUS AND PROCESSES {45}
332  DF  .~ False twist device {4}
334  DF  .~.~ Friction type {4}
341.~.~.~ Having a frictional tube, or a twisting head therefor, through which yarn passes {2}
342  DF  .~.~.~.~> Plural twist tubes
343  DF  .~.~.~.~> Including mounting, support, or housing

DEFINITION

Classification: 57/341

Having a frictional tube, or a twisting head therefor, through which yarn passes:

(under subclass 334) Subject matter wherein the frictional force applied to the yarn strand is created by the peripheral surface surrounding an aperture or opening which is formed in a tubelike structure.

(1) Note. Twisting heads or inserts which are generally used for replacing a worn-out end of a twist tube which has a removable head or insert are also in this subclass.

(2) Note. The yarn strand has to pass through the aperture to receive the false twist.

SEE OR SEARCH THIS CLASS, SUBCLASS:

344+, for similar twist devices, but having a yarn-gripping means for holding the yarn strand to permit the twisting thereof.