| 摘要 |
PURPOSE:To prevent a driver from missing a warning by enlarging the warning sound during travelling at a high speed. CONSTITUTION:While a warning device 6 closes an air passage 8 by air pressure in a tire 5 when it is maintained at a predetermined level, its valve is opened due to elastic force of a spring 11 when said air pressure is lowered below the predetermined level. Accordingly, if a valve 9 is opened during travelling of a car or the car is driven with the opened valve, since the warning device 6 rotates along with a wheel and a draft is drawn in the air passage 8 opened in the tangential direction a whistle member 7 vibrates and gives a warning sound. Fast travelling of the car causes fast rotation of a wheel 1 and fast current in said passage 8 as a result, making the warning sound louder. |
