Sensor switch

Details Sensor switch Sensor switch

1992-09-28

1994-06-14

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340571, G08B 1314

Patent

active

053213904

ABSTRACT:
In a portable device sensitive to a change in movement a switch inside the device has a movable slug which increases the electrical resistance in an electrical circuit when the device is disturbed. Such increase in resistance in the electrical circuit unbalances two inputs of a Schmitt trigger to cause an output of the Schmitt trigger to switch a switching transistor to cause an oscillator to drive an output transducer to give an alarm. A feedback loop limits the period for which the alarm is given and a delay circuit prevents an alarm being given when the device is initially energized and before the two inputs of the Schmitt trigger are balanced.

REFERENCES:
patent: 3745551 (1973-07-01), Smith
patent: 4030087 (1977-06-01), Ritchie et al.
patent: 4479114 (1984-10-01), Yamamoto
patent: 4772879 (1988-09-01), Hein
patent: 5027105 (1991-06-01), Dailey et al.
patent: 5153566 (1992-10-01), Yun
patent: 5235321 (1993-08-01), Rowan et al.

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