US PATENT SUBCLASS 242 / FOR 179
.~.~.~.~.~ Helically grooved drum (242/47.11)

Current as of: June, 1999
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242 /   HD   WINDING, TENSIONING, OR GUIDING

FOR 168  DF  CORDAGE (242/47) {8}
FOR 169  DF  .~ Unidirectionally moving coils (242/47.01) {5}
FOR 176  DF  .~.~ Plural drums (242/47.08) {1}
FOR 177  DF  .~.~.~ Single run contacting (242/47.09) {1}
FOR 178  DF  .~.~.~.~ Planetating (242/47.1) {1}
FOR 179.~.~.~.~.~ Helically grooved drum (242/47.11)

DEFINITION

Classification: 242/FOR.179

Foreign Art Collections for device wherein the face of at least one of the drums is modified to comprise a screw-thread like configuration, whereby the configuration, due to the rotation of the drum about its axis, acts to progress the coils axially of the drum.