US PATENT SUBCLASS 318 / 463
.~.~ Tachometer-type detector

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}
461  DF  .~ Speed or rate-of-movement {3}
463.~.~ Tachometer-type detector {1}
464  DF  .~.~.~> Electric generator tachometer

DEFINITION

Classification: 318/463

(under subclass 461) Subject matter in which the sensing means comprises a tachometer device.

(1) Note. A "tachometer device" is defined as a device adapted to be connected to a moving body and to develop a force, pressure (including electrical potential) or other quantity which varies with the speed of the moving body which force, pressure or other quantity is availed of to actuate another device to a degree varying with the speed of the moving body.

SEE OR SEARCH THIS CLASS, SUBCLASS:

449, and the Search Notes thereto, for motor systems having a tachometer device in which the output thereof is compared with the output of a master or standard device for the purpose of automatically controlling motor operations.

462, and the Search Notes thereto, for speed responsive devices of the centrifugal type for motor control systems.

SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure, appropriate subclasses for generator structure, per se, which may be used as electric tachometers.

322, Electricity: Single Generator Systems,

32, for generator systems having generator control in response to generator speed wherein the sensing device is a tachometer.

324, Electricity: Measuring and Testing,

160, for speed measuring systems wherein electric tachometers are used as speed indicators.

361, Electricity: Electrical Systems and Devices,

236, for speed responsive means including tachometers for controlling electrical systems in response to the speed of some device.

418, Rotary Expansible Chamber Devices, for appropriate subclasses, for rotary expansible chamber devices, per se.