Three hand movement for a timepiece having a stepping motor
US4888749A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1989 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Jan 30, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C3/008
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved movement for a three hand quartz analog timepiece having a frame, a stepping motor with the motor pinion adapted to step once per second, and a plurality of coaxial output members rotatably mounted in the frame including a spindle for driving a "seconds" hand and having a toothed seconds wheel driven by a two-pin rotor pinion, a two-pin reduction drive pinion connected to the spindle, a coaxial sleeve having a toothed minutes wheel and a coaxial sleeves having a toothed hours wheel. The improvement comprises a dual reduction gear assembly with a single shaft rotatably mounted in the frame having a toothed third wheel driven by the reduction drive pinion and having a first reduction pinion and a second reduction pinion directly driving the hours and minutes wheel, respectively, from the same shaft. The first reduction pinion is the two-pin type and the second reduction pinion is a spur gear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.