Measuring and testing – Vibration – Sensing apparatus
Patent
1985-12-24
1987-09-01
Ciarlante, Anthony V.
Measuring and testing
Vibration
Sensing apparatus
73654, 340540, 340690, G01N 2900
Patent
active
046899979
ABSTRACT:
A motion detector for detecting earthquakes or the like provides a warning signal when vibrations having a frequency of the order of the natural frequency of an earthquake tremor are detected. A preferred embodiment of the device employs a vertical spring barb member which is mounted on a suitable support on one end thereof. A coupler member is supported on the other end of the barb member. This coupler member is connected through a coil spring to an inertial mass which is vertically positioned generally in external concentricity with the barb and the coupler, the spring being either compressed or extended to provide a resilient coupling between the coupler member and the inertial mass. The spring and mass elements are chosen so as to have a natural resonant frequency at the frequency of an earthquake tremor (0.7-3 Hz), or other disturbance to be detected. An electrical switching circuit is provided so that when the disturbance to be detected occurs, motion of the inertial mass will cause the electrical switch to close thereby activating a suitable alarm device for providing a warning signal.
REFERENCES:
patent: 3002062 (1961-09-01), Globe
patent: 4363377 (1982-12-01), Van Gerpen
Ciarlante Anthony V.
Sokolski Edward A.
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