US PATENT SUBCLASS 338 / 143
.~.~ Contact moves along turns of helical resistance element

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.~.~ Contact moves along turns of helical resistance element {6}
144  DF  .~.~.~> Contact lifts element from core
145  DF  .~.~.~> Helical resistance element moves
146  DF  .~.~.~> With helical collector parallel to helical element
147  DF  .~.~.~> Resistor formed as a flat spiral
148  DF  .~.~.~> With helical screw for moving the contact
149  DF  .~.~.~> With contact stop

DEFINITION

Classification: 338/143

(under subclass 118) Subject matter wherein the resistance element is formed as a helix, the contact being mounted to move around and remain in contact with each convolution of the helix.

(1) Note. In this type of resistor the contact must be rotated relative to the helix through substantially more than 360 deg. to move the contact from one end to the other of the helical element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

79, for mechanically variable resistors with element winding and/or unwinding.

162+, for variable resistors with contacts that are angularly slidable over the resistance element.

190+, for variable resistors of the tap type which have an angularly movable contact. SEE OR SEARCH CLASS

336, Inductor Devices,

139+, for inductors having a contactor following a helical conductor.