Watertight control device for watches
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United States of America Patent
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Jan 17, 1995
Grant Date -
N/A
app pub date -
Feb 3, 1993
filing date -
Feb 12, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
A watch control device comprises a crown with a central cavity surrounded by an annular cavity in the bottom of which is formed a groove. The lateral external face of the annular cavity has a thread adapted to be screwed onto a thread formed on the lateral external face of an external part of a tube screwed into a watch casing. An injected thermoplastic elastomer seal is disposed in the annular cavity. This seal comprises two parts of the same external diameter, but of different internal diameter, the portion of greater diameter engaging in the groove and the portion of smaller diameter being that on which the tube acts in the screwed up position of the crown.
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