Patent ID: 8764284

Claim:
A push button for a timepiece comprising a cylindrical armature inside which there is a longitudinally-arranged, through push button formed of a head, having an inner face abutting against a first shoulder made in the armature when manual pressure is exerted on the head, and of a stem which ends in a retaining means limiting the axial travel of said stem in the armature; a first push button return spring is wound around the stem, said spring is arranged between the bottom face of the head and a first retaining means partially derived from said armature, said push button being wherein it includes a second spring wound around the stem; one of the ends of said second spring rests on said first retaining means and the other end thereof rests on a second retaining means partially derived from said armature, the second spring being arranged to bend and act as a valve if the pressure prevailing inside the timepiece is higher than the pressure prevailing outside said timepiece.