Abstract:
The disclosed safety light is designed to provide automatic operation for lights placed on elastic tires. Wheel ( ) comprises a hub ( ), a urethane tire ( ), and a safety light circuit molded into the urethane tire and hub. The safety light circuit is formed on a circuit board which holds electrical components comprising, a battery (B ), deformation-activated switch (SW ), photo sensor and delay(CDS , D , R , R , Q , C ), and illumination devices (LED and LED ). Battery(B ) provides electromotive power to operate all circuitry, with switch (SW ), photo sensor CDS , and illumination devices (LEDp and LED ) placed substantially in series electrically. Switch (SW ) is designed to conduct current when a change in deformation or a specified rate-of-change in deformation of the tire material is detected. The photocell (CDS ) signals the photo-sensor to conduct current when photocell (CDS ) detects a sufficiently low level of light. When both switch (SW ) and photo sensor are conducting, current will flow to illumination devices(LED and LED ) and provide light output.