Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-07-14
2000-12-26
Wu, Daniel J.
Communications: electrical
Condition responsive indicating system
Specific condition
3405681, 340539, 3406866, 340328, G08B 1314
Patent
active
061666351
ABSTRACT:
A radio burglar alarm system for travel bag includes a transmitter unit and at least one receiver unit, the transmitter unit transmitting one of a set of control signals, each receiver unit including a control switch controlled by the control signal from the transmitter unit to close/open the circuit, a vibration sensor for detecting a vibration of the respective receiver unit, and an alarm circuit controlled by the vibrations sensor to output an alarm signal. The control switch of each receiver unit closes the circuit between the vibration sensor and alarm circuit of the respective receiver unit when receiving no signal from the transmitter unit, enabling the alarm circuit to be triggered by the corresponding vibration sensor when the corresponding vibration sensor detects a vibration of the respective receiver unit. The transmitter unit has an emergency button, which directly drives the alarm circuit of each receiver unit to activate the alarm when depressed.
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Pham Toan
Wu Daniel J.
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