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| Issue 1295-3 |
| US 6,909,375 B2 |
| Seismic switch |
| William Díaz-López, P.O. Box 1081, Trujillo Alto, Puerto Rico 00978 (US) |
| Filed on May 15, 2003, as Appl. No. 10/439,160. |
| Claims priority of provisional application 60/381372, filed on May 20, 2002. |
| Prior Publication US 2003/0214416 A1, Nov. 20, 2003 |
| Int. Cl.7G08B 21/00 |
| U.S. Cl. 340—690 [340/689; 340/521; 367/13] | 24 Claims |
| 1. An emergency control system comprising:
a set of accelerometers that generate electronic signals in response to vibrations caused by an earthquake or an explosion;
a controller operationally coupled with the set of accelerometers and configured to receive the electronic signals and to
determine whether the electronic signals represent an earthquake or an explosion;
a first switch operationally coupled with the controller and with a door control circuit, wherein the controller toggles the
first switch upon detection of an earthquake to release the door control circuit; and
a second switch operationally coupled with the controller, with the door control circuit and with an emergency call circuit,
wherein the controller toggles the second switch upon detection of an explosion to release the door control circuit and to
activate the emergency call circuit, and wherein the first switch does not activate the emergency call circuit upon detection
of an earthquake.
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