Barrel for a self-winding timepiece
Abstract
Abstract A MAIN SPRING BARREL FOR A TIMEPIECE, PARTICULARLY A SELFWINDING TIMEPIECE, HAS AN INNER CYLINDREICAL WALL TO BE FRICTIONALLY ENGAGED BY THE MAIN SPRING OR A SLIP SPRING ASSOCIATED THEREWITH TO ENABLE SLIPPING OF THE MAIN SPRING RELATIVE TO THE BARREL WHEN THE MAIN SPRING IS SUFFICIENTLY WOUND. THE INNER SURFACE OF THE BARREL HAS A HARDNESS SUBSTANTIALLY EQUAL TO THAT OF THE MAIN SPRING OR THE SLIP SPRING AND HAS SELF-LUBRICATING CHARACTERISTICS. THE INNER BARREL WALL OR SURFACE IS PROVIDED WITH A RELATIVELY WIDE, SHALLOW DEPRESSION THAT EXTENDS OUTWARDLY BEYOND THE CYLINDRICAL SURFACE OF THE INNER WALL, AND CONSTITUTES A DETERRENT TO RELATIVE MOVEMENT BETWEEN THE MAIN SPRING OR ITS SLIP SPRING AND THE INNER BARREL SURFACE BY PROVIDING GRADUALLY SLOPING OR INCLINED AREAS OVER WHICH THE END OF THE SPRING, EITHER MAIN OR SLIP SPRING, MUST PASS.
Inventors
- 👤 Eduard Schnyder
- 👤 Christoph Bieri
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |