Crown for timepiece i.e. mechanical watch, has cap formed of lid integral with side skirt, and removable deckring made out of shape memory alloy, where deckring covers O-ring placed on shoulder arranged in lower face of cap

摘要

#CMT# #/CMT# The crown (1) has a cap (11) formed of a lid (112) integral with a side skirt. A removable deckring (60) made out of a shape memory alloy, where the transition temperature of the shape memory alloy is situated outside the service temperature of a watch, and the transition temperature is less than minus 25 degrees. The removable deckring covers an O-ring (5) placed on a shoulder (1161) arranged in a lower face (116) of the cap. A gripping area (1162) is provided for the removable deckring on the crown. #CMT# : #/CMT# An independent claim is also included for a method for the assembly and disassembly of a removable deckring of a crown for a timepiece. #CMT#USE : #/CMT# Crown for a timepiece i.e. mechanical watch. #CMT#ADVANTAGE : #/CMT# The crown is simple and economical in construction, and can be mounted without requiring tedious operation or manipulation of a circlip. The crown can be more easily removed, without impairing the sealing properties of the crown. The crown allows faster installation and replacement of sealing joints on the crown. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a partial cross-sectional view of a crown provided with a removable deckring, without a tube. 1 : Crown 5 : O-ring 11 : Cap 60 : Removable deckring 112 : Lid 116 : Lower face of cap 1161 : Shoulder 1162 : Gripping area.