Watch winding crown assembly
US3977178A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1975 |
| Grant date | Aug 31, 1976 |
| Priority date | — |
| Expiry date | Jul 9, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B3/046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a watch winding crown assembly of the type with a push-button axially displaceable relative to a crown body, the crown body has an integral cylindrical shank slidably and rotatably mounted in a pendant tube, with an interposed annular seal. The push button has a cylindrical head and shank guided in corresponding cylindrical parts of a through bore in the crown head and in its skirt, this skirt terminating with an inner shoulder in which part of the shank is keyed. A spring in the skirt acts against this shoulder and, in addition to outwardly biasing the push-button, compresses a further annular seal between the push-button and the skirt. The outer position of the push-button is defined by a widened terminal part of its shank abutting against said shoulder, this terminal part being secured to a winding stem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.