Tire pressure warning apparatus

摘要

An apparatus which is responsive to fluid pressure for detecting and indicating visually and accoustically the variation of pressure conditions such as the underinflation of vehicle tires. The apparatus comprises pressure sensors, annular conductive members, at least a pair of confronting heads, response means and indicating means. When the tire air pressure is normal, since the impedance value of the conductive members does not vary, the indicating device is not actuated. However, if the air pressure within even one of the tires becomes abnormal, the apparatus performs as designed and a signal emitted by the indicating device informs the driver of the abnormality.