Fluid-tight control mechanism, for example for watches

Claim 1

In a fluid-tight control mechanism comprising a socket member having in a bottom portion thereof means defining an opening, a tubular member extending through said opening and rigidly connected to said socket member, a button movably mounted within said socket member to undergo both manual rotational movement and manual axial sliding movement and having an inner portion composed of deformable synthetic material in compressively deformed contact with said tubular member and cooperative therewith to establish a fluid-tight connection therebetween, and a driving shank extending into said tubular member and having at one end a head portion embedded in and connected to said synthetic material and connectable at the other end to a member to be wound, the improvement in which said socket member has a cylindrical wall having a first annular end surface, and said button has a second annular surface which in an axially depressed rest position of the button faces said first annular surface, one of said first and second annular surfaces having an annular groove, and an O-ring packing in said groove and compressed in the axial direction of the button between the facing annular surfaces when the button is in said rest position.