Rotatable crystal and bezel assembly for achieving special visua

Details Rotatable crystal and bezel assembly for achieving special visua Rotatable crystal and bezel assembly for achieving special visua

1976-12-17

1978-01-10

Witkowski, Stanley J.

G04B 3900

Patent

active

040671860

ABSTRACT:
In a timepiece, a supplementary watch crystal is mounted over the regular watch crystal so as to be manually rotatable with respect to the regular watch crystal. The supplementary watch crystal may then be provided with special marking indicia or constructed of special material to achieve special visual effects when used in conjunction with other devices in a timepiece such as a rotatable bezel ring or rotatable "seconds" disc with markings thereon. Modified forms of the invention include a bezel extension formed on the supplementary crystal, or a second supplementary crystal mounted on the first supplementary crystal. The supplementary crystal is preferably mounted by an inner circumferential lip on the supplementary crystal disposed in an outer circumferential groove on the regular watch crystal.

REFERENCES:
patent: 1064770 (1913-06-01), Quinn
patent: 1333194 (1920-03-01), Wachter
patent: 2854815 (1958-10-01), Piquerez
patent: 3030763 (1962-04-01), Klingenberg
patent: 3735585 (1973-05-01), Takagi

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