ELECTROMECHANICAL CLOCKS OR WATCHES

Description

G04C covers timepieces that combine mechanical timekeeping elements with electrical components for regulation, display, or operation. This includes electromechanical watches and clocks where electric power drives the mechanical movement, electromagnets control oscillation or escapement mechanisms, or electrical circuits synchronize mechanical timekeeping functions. Typical technologies encompass stepping motors, electromagnetic balance wheels, and electrically-maintained pendulums used in hybrid analog and digital display systems. Digital-only electronic timepieces and purely mechanical clocks without electrical components are classified elsewhere.

13 direct subcodes

Child Classifications

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G04C 1/00 Winding mechanical clocks electrically
G04C 10/00 Arrangements of electric power supplies in time-pieces
G04C 11/00 Synchronisation of independently-driven clocks
G04C 13/00 Driving mechanisms for clocks by primary clocks
G04C 15/00 Clocks driven by synchronous motors
G04C 17/00 Indicating the time optically by electric means (G04C19/00 takes precedence)
G04C 19/00 Producing optical time signals at prefixed times by electric means
G04C 21/00 Producing acoustic time signals by electrical means
G04C 23/00 Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals (if restricted to producing acoustic time signals by electrical means G04C21/00)
G04C 3/00 Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means (clocks driven by synchronous motors G04C15/00)
G04C 5/00 Electric or magnetic means for converting oscillatory to rotary motion in time-pieces, i.e. electric or magnetic escapements (regulators G04C3/00)
G04C 9/00 Electrically-actuated devices for setting the time-indicating means (of secondary clocks G04C13/03)
G04C 99/00 Subject matter not provided for in other groups of this subclass