US PATENT SUBCLASS 335 / 239
.~.~ With time delay armature-movement control 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}
239.~.~ With time delay armature-movement control means {3}
240  DF  .~.~.~> Dashpot type
241  DF  .~.~.~> Auxiliary control coil
242  DF  .~.~.~> With plural armatures selectively retarded

DEFINITION

Classification: 335/239

(under subclass 220) Subject matter including means to produce a predetermined time interval between the energizing instant and the time of operation of the electromagnet.

(1) Note. The time interval may be determined, for example, by reluctance control means or dashpot means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

28+, for automatic reclosing or resetting switches combined with timing or delay means.

39+, for automatic switches with magnetic latch means having time delay.

59+, for retarded or delayed type switches. 139, for step-by-step type switches with timing or indexing means.

218, for temperature responsive type magnet and electromagnets with time delay means.

SEE OR SEARCH CLASS

74, Machine Element or Mechanism,

1.5, for miscellaneous escapements.

307, Electrical Transmission or Interconnection Systems,

141+, for switching actuation systems with time delay or retardation means.

361, Electricity: Electrical Systems and Devices,

195+, for electric circuits for relays and electromagnets with time delay.

368, Horology: Time Measuring Systems or Devices,

124+, for escapement mechanisms used in horology.