Horology: time measuring systems or devices – Cases – With bezel or crystal details
Patent
1983-05-31
1984-09-25
Roskoski, Bernard
Horology: time measuring systems or devices
Cases
With bezel or crystal details
368294, 368285, G04B 3700
Patent
active
044733062
ABSTRACT:
A crystal (1) of a wristwatch case contains a sapphire base plate (2) which, in front view, entirely covers the body (3) of the case. That plate (2) is in turn entirely covered by a second sapphire plate (4) which is glued (5) to plate (2) very rigidly. The crystal (1) is fastened to the body (3) by screws engaged from the back side of the body (3) in sockets (7), a head (9) of which is captured between the two plates (2, 4) of the crystal (1). The position of the sockets (7) is exactly determined by a conical seat (10) of housings hollowed out in plate (2), at the bottom of which rests the conical head (9) of the sockets (7). Flats (14) are formed on the heads (9), so that the glue forms packings (15) preventing the sockets (7) from turning while screwing the crystal (1). The upper face (6) of the square (3) and the heads (9) of the sockets (7) are masked by a metal coating (12) deposited by vacuum spraying on the other side of plate (4). The crystal (1) is, furthermore, decorated with semicylindrical colored sapphire baguettes (16) glued in corresponding grooves (19) of plate (4).
REFERENCES:
patent: 4327429 (1982-04-01), Klingenberg
patent: 4391533 (1983-07-01), Waki
patent: 4421423 (1983-12-01), Lederrey
Berger Peter L.
Montres Rado S.A.
Roskoski Bernard
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