Title: Small alarm system
Application Number: 97120233 Application Date: 1997.10.29
Publication Number: 1219720 Publication Date: 1999.06.16
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G08B21/00
Applicant(s) Name: Figgie International Inc. Address:
Inventor(s) Name: William R. Taylor
Attorney & Agent: shao wei
Abstract:
    A motion responsive alarm system including a motion sensor having a housing with a rotatable disk therein, a slot in the disk and a ball bearing in the slot and being loosely confined within an annular chamber in the housing surrounding the disk. The disk contains a plurality of orifices which pass between an LED on one side of the disk and a phototransistor on the other. A signal from the phototransistor is sent to a triggering circuit by interrupting light transfer between the LED and the phototransistor. The circuit includes a novel oscillator having a duty cycle of 10 % which drives the LED in the sensor. The device may be coupled to a self-contained breathing apparatus and is energized only when the breathing apparatus mask is being worn by the user.
Time: 8
<- Previous Patent:Flame detector   |  Next Patent:Motor vehicle positioning control... ->