US PATENT SUBCLASS 338 / 189
.~.~.~ With magnetic holder for controller arm

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}
185  DF  .~.~ With intervening connector between contact and element (e.g., taps) {6}
189.~.~.~ With magnetic holder for controller arm

DEFINITION

Classification: 338/189

(under subclass 185) Subject matter including a retaining or positioning magnet for locking or holding the movable contact in a predetermined position.

(1) Note. Subject matter classified in this subclass usually consists of a series of resistance-coils or other resistances adapted to be gradually cut into circuit by movement of a spring biased contact lever or arm from one tap to another in a predetermined order. When the final position is reached, the electromagnet holds the lever or arm in position against the stress of the biasing spring, which has a tendency to move the contact to its original or starting position. When the electrical circuit is broken in the magnet, the contact is returned to its starting position by the stress of the biasing spring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

12, for resistors magnetically operated through a housing or partition.

32, for resistors whose resistance value is responsive to a magnetic field.

64+, for resistors having electrical shielding.

103+, for compressible resistors of the pile type operated by an electromagnet. 107, for compressible resistors of the pile type which have an electromagnetic holder for the operator.

116, for mechanically variable resistors generally with electromagnetic operators.

182, for resistors with rectilinearly movable contacts and a contact locking means.

SEE OR SEARCH CLASS

335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,

2+, for electromagnetically activated switches.