DIFF Subgroup
G04B 21/02 Regular striking mechanisms giving the full hour, half hour or quarter hour
Introduced: September 1968
Title
Titles differ between systems:
IPC: Regular striking mechanisms giving the full hour, half hour, or quarter hour
CPC: Regular striking mechanisms giving the full hour, half hour or quarter hour
Full Title
Full titles differ between systems:
IPC:
Indicating the time by acoustic means > Regular striking mechanisms giving the full hour, half hour, or quarter hour
CPC:
Indicating the time by acoustic means (at preselected times G04B23/00; by electro-acoustic means G04C21/04; ) > Regular striking mechanisms giving the full hour, half hour or quarter hour
Of 8 combined children, 6 exist in both systems.
2 codes are CPC-only extensions.
3 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G04B 21/04 Hour wheels; Racks or rakes; Snails or similar control mechanisms IPC+CPC Available in IPC and CPC
- G04B 21/06 Details of striking mechanisms, e.g. hammer, fan governor IPC+CPC Available in IPC and CPC
- G04B 21/08 Sounding bodies; Whistles; Musical apparatus (with electro-acoustical transmitters G04C21/00, ) IPC+CPC Available in IPC and CPC
- G04B 21/10 Releasing or locking the regular stroke, e.g. for silence during the night IPC+CPC Available in IPC and CPC
- G04B 21/14 Winding-up the striking mechanism by the clockwork; winding up the clockwork by the striking mechanism IPC+CPC Available in IPC and CPC