US PATENT SUBCLASS 57 / 58.49
.~ Unitary multiple twist devices

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

1 R  DF  APPARATUS AND PROCESSES {45}
58.49.~ Unitary multiple twist devices {8}
58.52  DF  .~.~> With stranding or plying (e.g., doubling) {2}
58.59  DF  .~.~> With false twist
58.61  DF  .~.~> Plural co-axial loops
58.63  DF  .~.~> Spaced, driven flyer members
58.65  DF  .~.~> Take-up type {2}
58.7  DF  .~.~> With strand feeding means
58.72  DF  .~.~> With package control means {4}
58.83  DF  .~.~> With strand guiding, guarding, or controlling means {2}

DEFINITION

Classification: 57/58.49

(under subclass 1) Devices in which a loop or balloon of strand material being twisted is revolved about its own supply or take-up package.

(1) Note. Two twists are produced for each revolution of a single loop about its package. Further twist may be added (or subtracted) by the introduction of an additional loop of the strand revolving about its package in the sense opposite to (or the same as) that of the first loop. For patents disclosing such plural co-axial loops, see subclass 58.61 indented hereunder.

(2) Note. These devices differ from the devices in subclass 58.3 in that the latter must include at least one strand loop revolving about the package of another strand. Unitary multiple twist devices, of the type found in this and indented subclasses, may constitute a subcombination of a skip type strander; see, for example patent 2,499,245 to Harmon, in subclass 58.32 above.

(3) Note. Either the supply package or the take-up package, or both, may be rotated or revolved to produce an additional or subtractive twist.

SEE OR SEARCH THIS CLASS, SUBCLASS:

60+, for means for imparting both a delivery twist and a receiving twist to a strand or strands.