Gear mechanism especially for timepiece
US5280460A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1991 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | May 20, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B13/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gear mechanism for use in horology is described. The gear mechanism not only returns one of the wheels therein to its original position but also carries along with it a second wheel thereby enabling the mechanism to be made thinner and reducing the number of parts needed to carry out these two functions. The mechanism has a first wheel and a second wheel, the first wheel constituting a toothed wheel fitted on an axis on which is fixed a heart-shaped cam, the point of this cam functioning as the gear engaging means for the second wheel, the cam enabling return of the said first wheel to its starting position by means of a hammer. The invention is of particular value in chronographs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.