Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1987-04-16
1989-01-24
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307116, 307140, 340566, 367 94, H01H 3500
Patent
active
048002933
ABSTRACT:
Infrasonic switch device to actuate an alarm in response to detection of infrasonic energy, including a multi-position switch circuit having a "standby" or "reset" position responsive to infrasonic signals, an infrasonic detection circuit to detect and pass selected levels of infrasonic energy, a trigger circuit to actuate an alarm such as a light or a buzzer for a predetermined time upon detection of the selected levels of infrasonic energy, and a timing circuit to permit actuation of the alarm for a predetermined time when the multi-position switch is in the "standby" or "reset" mode. The device also includes delay switching angle circuitry to consume the power to operate the device's internal components utilizing only selected portions of both the positive and negative AC power cycle and to utilize the balance of each AC cycle to operate the alarm.
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Ip Paul
Shoop Jr. William M.
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