US PATENT SUBCLASS 318 / 484
.~ Time or with time-delay means

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

445  DF  AUTOMATIC AND/OR WITH TIME-DELAY MEANS (E.G., AUTOMATIC STARTING AND/OR STOPPING) {20}
484.~ Time or with time-delay means {3}
485  DF  .~.~> Dash-pot or other mechanical delay means
486  DF  .~.~> Pilot- or servo-motors
487  DF  .~.~> Electromagnetic or inductive time-delay means

DEFINITION

Classification: 318/484

(under subclass 445) Subject matter in which the sensing means are responsive to the occurrence of a particular instant of time (e.g., 8:30 A.M., 5:00 P.M., etc.), or to the passage of a predetermined interval of time (e.g., 20-minutes, 4-hours, etc.), or in which means are provided for delaying or retarding the operation of the motor control

means (e.g., by means of dash-pots, slow-speed operation of the motor control means by a slow-speed motor or through speed-reducing gearing, etc.).

(1) Note. Since in any automatic control system the waiting period for any predetermined condition to occur means, by necessity a passage of some intervening interval of time, every automatic motor control system involves, therefore, a time-delay in a broad sense. However, in such automatic control systems the time interval is indefinite and may vary in magnitude from an infinitesimally short period to an indefinitely long period. The time or time intervals intended to be included herein are of reasonably definite and of predetermined values and, consequently, the means included herein must be capable by its inherent mode of operation of causing a control to occur at some precise time or after the lapse of a reasonably definite and fixed (although adjustable) period of time.

SEE OR SEARCH THIS CLASS, SUBCLASS:

285, for this subject matter where the system includes means for the automatic control of the reversing of a motor in response to instants of, or passage of a predetermined interval of time, or where the control means includes time delay means.

447, for automatically controlled motor systems having means for rendering the condition-sensing means nonresponsive or less responsive for limited periods of time.