Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-06-10
1995-12-12
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340687, 200 6145R, G08B 2100
Patent
active
054753724
ABSTRACT:
An earthquake detector motion sensitive device capable of detecting any one or more of the conditions of angular tilt, vibration or acceleration having an electrically conductive pendulum with a main mass located next to its suspension point and having an extension arm that extends below the main mass. When the pendulum suspension point is acted upon by an outside force of vertical or lateral motion, the extension arms lower end will travel farther than the distance that the main mass travels, causing the lower end of the pendulum extension arm to mechanically amplify the movement of the main mass. At the lower end of the extension arm is an upper switch contact which is suspended into the opening of a lower switch contact. During seismic activity the two switch contacts will be caused to touch each other which will activate an audio signaling device and charge an electrolytic capacitor. When the pendulum swings back toward its normal state of equilibrium, the two switch contacts will no longer be touching and the audio signaling device will continue to produce an audio output until the current in the electrolytic capacitor is discharged. This cycle of pendulum motion continues until the seismic activity acting upon the pendulum suspension point subsides and the pendulum returns to its normal state of equilibrium. The use of the electrolytic capacitor causes the audio output to produce a unique and distinguishable sound and allows the circuit to continue its audio output for an extended duration even when the pendulum switch contacts make minimal contact. Sensitivity adjustment is made by turning in or out an adjusting screw which moves the lower switch contact closer or farther away from the upper switch contact.
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Hofsass Jeffery A.
Lee Benjamin C.
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