Alarm device

Details Alarm device Alarm device

1999-04-09

2000-04-11

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340571, G08B 1314

Patent

active

060492775

ABSTRACT:
An antitheft alarm device has an electric circuit 21 for generation of an audible alarm and a supporting mechanism 42 for a flexible cord 6 formed between an upper and lower face plates 2, 3. The circuit 21 has a switch 26 comprising a stationary terminal 35 and a movable terminal 34 biased by a spring to be engaged with the stationary terminal 35. The flexible cord 6 detachably held by the mechanism 42 normally maintains the movable terminal 34 to be disengaged with the stationary terminal 35. After the cord 6 is detached, the movable terminal 34 engages with the stationary terminal 35 and consequently the audible alarm is generated.

REFERENCES:
patent: 3815118 (1974-06-01), McDonald
patent: 3851326 (1974-11-01), Costa
patent: 3938126 (1976-02-01), Ransom
patent: 4090183 (1978-05-01), Miller
patent: 4633232 (1986-12-01), Nelson et al.
patent: 4908607 (1990-03-01), Yannotti et al.
patent: 5396219 (1995-03-01), Chen
patent: 5790028 (1998-08-01), Lee

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