Patent ID: 8333504

Claim:
A portable timepiece comprising: a timepiece exterior assembly; and a degassing valve operable to allow a gas in an interior of the timepiece exterior assembly to escape to an exterior of the timepiece exterior assembly, the degassing valve comprising: a valve casing providing communication between the interior and exterior of the timepiece exterior assembly; a valve member accommodated in the valve casing and configured to be moved from a closed position to an open position when an inner pressure of the timepiece exterior assembly becomes a predetermined pressure or more; an exhaust button attached to the timepiece exterior assembly and configured to be pushed into the valve casing toward the valve member; a first coil spring for urging the exhaust button and the valve member away from each other; and a second coil spring for urging the exhaust button toward the exterior of the timepiece exterior assembly; wherein when the inner pressure of the timepiece exterior assembly is greater than a spring force of the first coil spring, the valve member is moved to the open position, and a portion of the gas in the timepiece exterior assembly accumulates between the valve member and the exhaust button; and wherein when the exhaust button is pushed into the valve casing, the accumulated gas is discharged to the exterior of the timepiece exterior assembly, and, at this time, the valve member is maintained at the closed position by the spring force of the first coil spring.