US PATENT SUBCLASS 335 / 274
.~.~.~ With armature-biasing means or bias-adjustment means

Current as of: June, 1999
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335 /   HD   ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS

209  DF  MAGNETS AND ELECTROMAGNETS {10}
220  DF  .~ With magneto-mechanical motive device (e.g., electromagnet with armature) {21}
270  DF  .~.~ Armature-mounting means {6}
274.~.~.~ With armature-biasing means or bias-adjustment means

DEFINITION

Classification: 335/274

(under subclass 270) Subject matter including significant details of the armature biasing means or including significant means for adjusting the armature biasing means.

(1) Note. Bias as used in this class refers to unidirectional force applied by a spring, a permanent magnet or an electromagnet acting on an armature, which tends to hold the armature in a given position.

(2) Note. This subclass includes magnetically biased armatures, wherein a permanent magnet or an electromagnet is used to apply biasing force to the armature.

SEE OR SEARCH THIS CLASS, SUBCLASS:

15+, for automatic circuit interrupting devices with contact biasing.

192, for switches with contact biasing means.

253+, for electromagnets with armature latch means. 269, for electromagnets biased to be dynamically balanced.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

142, for switching systems with switch locking, holding or braking means.

361, Electricity: Electrical Systems and Devices,

194, for control circuits for electromagnetic devices including a holding means.