Seismosensitive device
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United States of America Patent
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-
Jan 8, 1985
Grant Date -
N/A
app pub date -
Aug 25, 1983
filing date -
Jun 10, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A seismosensitive device comprises a hermetically sealed enclosure having a recess at the bottom, a first annular surface provided around the recess and having a radial gradient substantially of horizontal level and a second annular surface provided around the first annular surface and progressively diverging from the lower to upper portions with a slope having a gradient greater than that of the first annular surface. A switch assembly comprising a drop of mercury placed at the recess, an electrode bar provided with the enclosure, a needle contact secured to the electrode bar to have its lower end immersed into the drop is provided. When the mercury drop moves along the gradient surfaces significantly smoothly to separate from the needle contact upon tremor of the earth, the switch will open.
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