Horology: time measuring systems or devices – Cases – Of particular material
Patent
1989-02-07
1990-10-30
Miska, Vit W.
Horology: time measuring systems or devices
Cases
Of particular material
368300, 368309, G04B 3700
Patent
active
049674021
ABSTRACT:
A sealed watchcase includes a middle-and-bezel having two concentric annular parts which are held one inside the other by means of friction. The internal part of these two parts is a rigid ring made of ordinary metal or plastic. The external part of these two parts is made of precious-metal and forms a thin casing covering at least the radially external surfaces of the rigid ring. A glass part is bonded inside an internal snap in the precious-metal casing. A back cover is held against a bottom flat surface of the middle-and-bezel by fixing screws which are screwed into the rigid ring and ensure, when tightened, clamping of a fitting ring inserted together with a watch movement into the opening of the rigid ring. Seals are compressed between the back cover and the middle-and-bezel. Only the back cover, the precious-metal casing and the glass form the external parts of the watchcase. As a result of this structure, it is possible to make ultra-flat precious-metal cases requiring only a minimum amount of precious metal.
REFERENCES:
patent: 309158 (1884-12-01), O'Hara
patent: 2252647 (1941-08-01), Schmitz
patent: 3952499 (1976-04-01), Reisman
patent: 4241442 (1980-12-01), Grohoski
patent: 4529323 (1985-07-01), Gagnebin
patent: 4544284 (1985-10-01), Geiger et al.
patent: 4620798 (1986-11-01), Scarzini
patent: 4692033 (1987-09-01), Mock et al.
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