G
SECTION G — PHYSICS
  
INSTRUMENTS
 G04
HOROLOGY
 G04C
ELECTRIC CLOCKS OR WATCHES (mechanical parts of clocks or watches in general 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 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 G04B 1/20, G04B 3/06, 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 G04B 15/00, G04B 17/00)
 G04C 9/00
Electrically-actuated devices for setting the hands (manual hand-setting devices for mechanical time pieces 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 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 G04B 19/00, 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 (G04C 21/04, G04C 21/16 take precedence)
 G04C 21/04
·  Indicating the time of the day (acoustic indication of time 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 G04C 21/00; mechanical alarm clocks G04B 23/02; apparatus which can be set and started to measure-off predetermined intervals G04F 3/06; electric time or time-programme switches 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 (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