US PATENT SUBCLASS 338 / 171
.~.~.~.~ With plural contact portions

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}
162  DF  .~.~.~ Contact angularly slidable {11}
171.~.~.~.~ With plural contact portions

DEFINITION

Classification: 338/171

(under subclass 162) Subject matter wherein the contact is composed of two or more separated portions, each portion engaging the resistance element, all portions being slidable as a unit along the resistance element.

(1) Note. Usually the purpose of the plural contact portions is to maintain a more uniform electrical conduction path between the contact arm and the resistance element as the contact slides along the element, as to reduce circuit noise.

SEE OR SEARCH THIS CLASS, SUBCLASS:

16, for photoconductive resistors with vibration control.

98, for mechanically variable resistors with motion or vibration damping means.

202, for movable contacts structure generally.