Personal alarm system

G - Physics – 08 – B

Patent

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Details

G08B 21/00 (2006.01) A62B 18/08 (2006.01) G01P 13/00 (2006.01) G08B 21/04 (2006.01)

Patent

CA 2159997

A motion responsive alarm system including a motion sensor (10) having a housing with a rotat- able disk (12) therein, a slot (34) in the disk and a ball bearing (32) in the slot and being loosely confined within an annular chamber (30) in the housing surrounding the disk. The disk contains a plurality of ori- fices (22) which pass between an LED (24) on one side of the disk and a phototransistor (26) on the other. A signal from the photo- transistor is sent to a triggering cir- cuit (51, 89, 100, 102) by inter- rupting light transfer between the LED and the phototransistor. The circuit includes a novel oscillator (60) having a duty cycle of 10 % which drives the LED in the sen- sor. The device may be coupled to a self-contained breathing appara- tus (104, 106, 150, 152, 154-160, 162, 164, 166, 168) and is ener- gized only when the breathing ap- paratus mask (156) is being worn by the user.

Système d'avertissement sensible au mouvement comprenant un détecteur de mouvement (10) pourvu d'un boîtier dans lequel est placé un disque rotatif (12), une fente (34) étant ménagée dans le disque, et un roulement à billes (32) se trouvant dans la fente et étant retenu de manière peu serrée dans une chambre annulaire (30) ménagée dans le boîtier entourant le disque. Ce dernier contient une pluralité d'orifices (22) qui s'étendent entre une diode électroluminescente (LED) (24), d'un côté du disque, et un phototransistor (26) de l'autre. Un signal provenant du phototransistor est transmis à un circuit déclencheur (51, 89, 100, 102) par l'interruption du transfert de lumière entre la LED et le phototransistor. Le circuit comprend un nouvel oscillateur (60) présentant un rapport cyclique de 10 %, qui commande la LED du détecteur. Le dispositif peut être couplé à un appareil de respiration autonome (104, 106, 150, 152, 154-160, 162, 164, 166, 168) et n'est excité que lorsque le masque respiratoire (156) est porté par l'utilisateur.

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