Watchcase having resilient snap-fit for rigid crystal

Horology: time measuring systems or devices – Cases – With bezel or crystal details

Patent

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Details

368295, 368291, 368292, G04B 3700

Patent

active

044733054

ABSTRACT:
A watchcase (1) comprises a flat crystal (3) of hard material held by pressure between elastically deformable opposite side walls (4) of a recess (5) formed at the top of the body (2) of the watchcase. The bottom face (8) of the crystal (3) compresses a seal (9) arranged around the opening of the body. The restoring force exerted on the bevel of the crystal by the facing surface of the walls (4) as well as the rigidity of the crystal make it possible to make tightly sealed watchcases in which the crystal is held on the body over a portion of its margins only.

REFERENCES:
patent: 2029769 (1936-02-01), Goldblatt
patent: 3292362 (1966-12-01), Klingenberg
patent: 4308611 (1981-12-01), Kanai

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