EP 0008832 B1 19820901 - CLOCKWORK WITH HANDS COMPRISING A DIFFERENTIAL-GEAR MECHANISM
Title (en)
CLOCKWORK WITH HANDS COMPRISING A DIFFERENTIAL-GEAR MECHANISM
Publication
Application
Priority
CH 926478 A 19780904
Abstract (en)
[origin: US4259735A] In a timepiece movement, more particularly a quartz wrist watch movement, having a low-torque stepping motor, there is provided a differential mechanism which drives the hands and makes it possible to move the hour-hand alone in jumps. A cannon-pinion having a toothing acts as a sun gear. A planet gear is mounted on an hour-wheel which acts as a planet carrier. A ring gear takes the form of an annulus having internal teeth which is normally stationary but is controlled by a stem and can be rotated by jumps to cause the planet gear to roll along the cannon-pinion toothing, thus causing the planet carrier and consequently the hour hand to jump.
IPC 1-7
IPC 8 full level
G04B 19/02 (2006.01); G04B 13/00 (2006.01); G04B 19/22 (2006.01); G04B 19/25 (2006.01); G04B 27/00 (2006.01)
CPC (source: EP US)
G04B 13/007 (2013.01 - EP US); G04B 19/221 (2013.01 - EP US); G04B 27/005 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0008832 A2 19800319; EP 0008832 A3 19800402; EP 0008832 B1 19820901; CH 617815 B; CH 617815G A3 19800630; DE 2963613 D1 19821028; JP S5537996 A 19800317; US 4259735 A 19810331
DOCDB simple family (application)
EP 79200475 A 19790830; CH 926478 A 19780904; DE 2963613 T 19790830; JP 11162079 A 19790831; US 7005479 A 19790827