Measuring and testing – With fluid pressure – Leakage
Patent
1980-02-07
1982-04-27
Howell, Kyle L.
Measuring and testing
With fluid pressure
Leakage
33172E, G01M 336
Patent
active
043264085
ABSTRACT:
Disclosed is an airtightness testing apparatus for watches which is constructed as follows. A support block and a guide member having a seat to carry a watch to be examined are attached to a post at a vertical space from each other, the post being set up inside an airtight container which is pressurized or decompressed. A light emitting element and a light receiving element are embedded in the support block so as to face each other with a vertical gap inbetween. Inside a cavity adjoining the gap in the block, there are a screening plate vertically projected in the gap and a contact member solidly fixed to the plate. In a test, a needle-shaped bottom end portion of the contact member is brought in contact with the watch to be examined, the screening plate is moved by a distortion of the watch accompanying a change of the pressure inside the container, thereby restricting a luminous flux from the light emitting element, and the change of the luminous flux is converted into a change of photoelectric current and displayed visually.
REFERENCES:
patent: 3417476 (1968-12-01), Martens
patent: 3751972 (1973-08-01), Haas
patent: 3991622 (1976-11-01), Oowada
Howell Kyle L.
Roskos Joseph W.
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