US PATENT SUBCLASS 338 / 148
.~.~.~ With helical screw for moving the contact

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

68  DF  MECHANICALLY VARIABLE (E.G., RHEOSTAT) {24}
118  DF  .~ Movable contact electrically adjustable over length of resistance element {21}
143  DF  .~.~ Contact moves along turns of helical resistance element {6}
148.~.~.~ With helical screw for moving the contact

DEFINITION

Classification: 338/148

(under subclass 143) Subject matter wherein a threaded shaft or screw having a contactor linked therewith is so located in relation to the helical resistor element that rotation of the

threaded shaft causes linear travel of the contact as the contact is rotated along the turns of the helical wound resistance element.

(1) Note. The helical screw is structure separate from and in addition to the helical resistance element, although the screw may be a track parallel to the helical element. Where the contactor is moved linearly by engagement with the helical turns of the resistance element, classification is in the generic subclass 143 above.

SEE OR SEARCH THIS CLASS, SUBCLASS:

180+, for a mechanically variable resistor having a screw operated rectilinearly slidable contact.

202, for movable contact structure, per se.