US PATENT SUBCLASS 338 / 180
.~.~.~.~ Screw-operated

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}
160  DF  .~.~ Contact slides along in contact with element {3}
176  DF  .~.~.~ Contact rectilinearly slidable {6}
180.~.~.~.~ Screw-operated {1}
181  DF  .~.~.~.~.~> Screw, a fine-adjustment

DEFINITION

Classification: 338/180

(under subclass 176) Subject matter including a helical screw and nut as the actuator or a part of the actuator for the rectilinearly slidable contact.

(1) Note. Subject matter in this subclass usually includes a screw threaded shaft having a slider located thereon with the slider carrying a contact brush engaging a resistance element. Upon rotation of the shaft the slider and contact brush are moved rectilinearly over the resistance element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

87+, for a variable resistor of the penetrating type which may be screw operated.

117, for a variable resistor with slidable helical and linear contacts which may be screw operated.

125, for resistors with plural elements bridged by a movable contact which may be screw operated. 148, for a resistor whose contact follows the helical turns of the resistance element with the contact being screw operated.