Patent ID: 8408785

Claim:
A portable timepiece in which there is mounted inside a timepiece exterior assembly a vent valve allowing gas pressure in the timepiece exterior assembly to escape to the exterior, wherein the vent valve comprises: a pipe provided in the timepiece exterior assembly so as to establish communication between the interior and the exterior of the assembly and having a stopper portion and a male screw portion; a valve body equipped with a valve body shaft portion inserted into the pipe, and a valve body head provided integrally with the shaft portion and having a plurality of vent holes and a female screw portion threadedly engaged with the male screw portion, and movable through a change in the mesh engagement of the male screw portion and the female screw portion; a retaining member mounted to the valve body shaft portion and adapted to move toward and away from the stopper portion from the interior side of the timepiece exterior assembly as the valve body moves; and packing consisting of a seal material capable of elastic deformation and mounted to the valve body shaft portion or the pipe to move toward and away from a valve seat surface provided on the pipe or the valve body shaft portion as the valve body moves.