|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G04 |
HOROLOGY

|  | G04C |
ELECTRIC CLOCKS OR WATCHES (mechanical parts of clocks or watches in general Fulltext... Hierarchy... Expanded...G04B)

|  | G04C |
Note(s) This sub-class includes electric features of mechanically-driven clocks or watches, such as electric winding of such clocks or the provision of electric contacts thereon.

|  | G04C 1/00 - G04C 9/00 |
Electric winding of mechanical clocks; Independent electric clocks or watches

|  | G04C 1/00 |
Winding mechanical clocks electrically (winding mechanically Fulltext... Hierarchy... Expanded...G04B 3/00)

|  | G04C 1/02 |
· | by electromagnets

|  | G04C 1/04 |
· | by electric motors with rotating or with reciprocating movement

|  | G04C 1/06 |
· · | winding-up springs

|  | G04C 1/08 |
· · | raising weights

|  | G04C 1/10 |
· | Protection against overwinding (in mechanical clocks or watches Fulltext... Hierarchy... Expanded...G04B 1/20, Fulltext... Hierarchy... Expanded...G04B 3/06, Fulltext... Hierarchy... Expanded...G04B 3/10)

|  | G04C 1/12 |
· · | of the spring

|  | G04C 1/14 |
· · | of the weights

|  | G04C 3/00 |
Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means

|  | G04C 3/02 |
· | acting on a pendulum

|  | G04C 3/04 |
· | acting on a balance

|  | G04C 5/00 |
Electric or electromagnetic escapements or regulating mechanisms (mechanical escapements or regulating mechanisms Fulltext... Hierarchy... Expanded...G04B 15/00, Fulltext... Hierarchy... Expanded...G04B 17/00)

|  | G04C 9/00 |
Electrically-actuated devices for setting the hands (manual hand-setting devices for mechanical time pieces Fulltext... Hierarchy... Expanded...G04B 27/00)

|  | G04C 9/02 |
· | brought into action by radio transmission

|  | G04C 11/00 - G04C 15/00 |
Electric clock installations; Master-and-slave clock systems; Synchronous-motor clocks

|  | G04C 11/00 |
Synchronisation of independently-driven clocks

|  | G04C 11/02 |
· | by radio

|  | G04C 11/04 |
· | over a line (transmitting time signals over telephone networks Fulltext... Hierarchy... Expanded...H04M 11/06)

|  | G04C 13/00 |
Driving mechanisms for clocks by master clocks

|  | G04C 13/02 |
· | Circuit arrangements; Electric clock installations

|  | G04C 13/04 |
· · | Master clocks

|  | G04C 13/06 |
· · · | Contact devices

|  | G04C 13/08 |
· | Slave clocks actuated intermittently

|  | G04C 13/10 |
· · | by electromechanical step-advancing mechanisms

|  | G04C 13/12 |
· · | by electromotors

|  | G04C 13/14 |
· · | by electrically-released mechanical driving mechanisms

|  | G04C 15/00 |
Clocks driven by synchronous motors

|  | G04C 17/00 - G04C 23/00 |
Indicating the time or producing time signals electrically

|  | G04C 17/00 |
Continuously indicating the time optically by electric means (by mechanical means Fulltext... Hierarchy... Expanded...G04B 19/00, Fulltext... Hierarchy... Expanded...G04B 19/20)

|  | G04C 17/02 |
· | by electric lamps

|  | G04C 19/00 |
Producing optical time signals at prefixed times by electric means

|  | G04C 19/02 |
· | by electric lamps

|  | G04C 19/04 |
· | by indicating members moved electrically, e.g. flap, band

|  | G04C 21/00 |
Producing acoustic time signals by electrical means

|  | G04C 21/02 |
· | Constructional details (Fulltext... Hierarchy... Expanded...G04C 21/04, Fulltext... Hierarchy... Expanded...G04C 21/16 take precedence)

|  | G04C 21/04 |
· | Indicating the time of the day (acoustic indication of time Fulltext... Hierarchy... Expanded...G04B 21/00)

|  | G04C 21/06 |
· · | by striking mechanism

|  | G04C 21/08 |
· · · | with snail

|  | G04C 21/10 |
· · · | with locking plate

|  | G04C 21/12 |
· · | by electro-acoustic means

|  | G04C 21/14 |
· · · | Electro-acoustic time announcement, i.e. spoken

|  | G04C 21/16 |
· | producing the signals at adjustable fixed times

|  | G04C 21/18 |
· · | by mechanically unlocking an electromechanical vibrator, e.g. actuated by the leakage flux of the electric driving means

|  | G04C 21/20 |
· · | by closing a contact to ring an electromechanical alarm

|  | G04C 21/22 |
· · · | put into action by the arbor of a mechanical alarm work

|  | G04C 21/24 |
· · · | put into action by the spring of a mechanical alarm work

|  | G04C 21/26 |
· · · | put into action by the vibrations caused by the operation of a mechanical alarm work

|  | G04C 21/28 |
· · | by closing a contact to put into action electro-acoustic means, e.g. awakening by music

|  | G04C 21/30 |
· · | with provision for a number of operations at different times, e.g. ringing the bells in a school

|  | G04C 21/32 |
· · · | giving indications at a number of places, each at a different time, e.g. system of alarms in a hotel

|  | G04C 21/34 |
· · | Devices on watches or similar portable time-pieces

|  | G04C 21/36 |
· · | Signal-repeating devices

|  | G04C 21/38 |
· · | Adjusting the duration of signals

|  | G04C 23/00 |
Clocks or clock mechanisms with attached or built-in means operating any device at a preselected time or after a predetermined time intervals (if restricted to producing acoustic time signals by electrical means Fulltext... Hierarchy... Expanded...G04C 21/00; mechanical alarm clocks Fulltext... Hierarchy... Expanded...G04B 23/02; apparatus which can be set and started to measure-off predetermined intervals Fulltext... Hierarchy... Expanded...G04F 3/06; electric time or time-programme switches Fulltext... Hierarchy... Expanded...H01H 43/00)

|  | G04C 23/02 |
· | Constructional details

|  | G04C 23/04 |
· · | Housings, supports, shielding, or similar stationary parts

|  | G04C 23/06 |
· · | Driving or regulating means

|  | G04C 23/08 |
· · | Programming means

|  | G04C 23/10 |
· · | for actuating any element which operates, or initiates the operation of, the device concerned

|  | G04C 23/12 |
· · | Electric circuitry

|  | G04C 23/14 |
· | Mechanisms continuously running to relate the operation(s) to the time of day

|  | G04C 23/16 |
· · | acting only at one preselected time or during one adjustable time interval

|  | G04C 23/18 |
· · | for operating one device at a number of different times

|  | G04C 23/20 |
· · · | with contacts operated, or formed, by clock hands or elements of similar form

|  | G04C 23/22 |
· · · | with the actuating element carried by a disc

|  | G04C 23/24 |
· · · · | the actuating element controlling another element mechanically

|  | G04C 23/26 |
· · | for operating a number of devices at different times

|  | G04C 23/28 |
· · · | with contacts operated, or formed, by clock hands or elements of similar form

|  | G04C 23/30 |
· · · | with the actuating element carried by a disc

|  | G04C 23/32 |
· · · · | the actuating element controlling another element mechanically

|  | G04C 23/34 |
· · | with provision for automatic modification of the programme, e.g. on Sunday

|  | G04C 23/36 |
· · · | by external influences

|  | G04C 23/38 |
· | Mechanisms measuring a chosen time interval independently of the time of day at which the interval starts

|  | G04C 23/40 |
· · | using continuously-running mechanism

|  | G04C 23/42 |
· · | acting only at the end of a single time interval

|  | G04C 23/44 |
· · · | with provision for selection from a number of preset intervals

|  | G04C 23/46 |
· · · | with provision for adjustment of the interval (Fulltext... Hierarchy... Expanded...G04C 23/44 takes precedence)

|  | G04C 23/48 |
· · | acting at the ends of successive time intervals

|  | G04C 23/50 |
· · | with provision for modification of the interval(s) by external influences