Analog timepiece movement for large diameter energy cell
US5210722A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1992 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Apr 30, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C3/008
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Analog timepiece movement adapted for a large diameter, thin energy cell, the movement comprising a molded frame of insulating material having a top central wall, and having depending peripheral side wall portions. A flat bridge of insulating material divides the movement into an inner cavity. A stepping motor and gear train are disposed in the inner cavity and a quartz crystal is disposed outside of the cavity. One of the wheel assemblies is of non-magnetic material and extends through a hole in by the stepping motor stator. The peripheral wall portions and the bridge together define a circular envelope in the outer cavity adapted to locate and contain said energy cell. The movement is substantially elliptical in shape, the ellipse having a minor axis slightly greater than that of the energy cell, and the quartz crystal is disposed on one end of the elliptical frame alongside the energy cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.