US PATENT SUBCLASS 335 / 247
.~.~.~ With chatter- or noise-preventing 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}
243  DF  .~.~ Alternating current type {5}
247.~.~.~ With chatter- or noise-preventing means {2}
248  DF  .~.~.~.~> Spring or cushion-type vibration absorber
249  DF  .~.~.~.~> Special armature construction or mounting means (e.g., to assure positive seating of armature)

DEFINITION

Classification: 335/247

(under subclass 243) Subject matter including means to prevent or decrease chatter or hum noise of the armature.

(1) Note. The chatter or hum noise of the armature is caused by vibration of the armature relative to the stop means. One cause of this type of vibration is alternating current relays in the alternations of the current when the relay is energized.

SEE OR SEARCH THIS CLASS, SUBCLASS:

46, for automatic circuit interrupting switches with vibration preventing means.

90, for periodic switches with vibrating damping means.

104, for alternating current switches with chatter or bounce preventing means. 157+, for switches with operation inhibiting means.

193, for contact actuator with vibration, bounce or vibration prevention means.

244+, for alternating current magnets with flux phase displacement means which may also prevent vibration or chatter.

271, for armature mounting means with vibration preventing means.

SEE OR SEARCH CLASS

248, Supports,

560+, for resilient supports.

336, Inductor Devices,

100, for inductor devices (e.g., transformers and inductive reactors) having vibration control.