VEHICLE PNEUMATIC TYRE PRESSURE DROP INDICATOR Russian patent published in 1998 - IPC

FIELD: automotive industry. SUBSTANCE: device has cap turned into tyre valve instead of standard cap, and body. Bushing with air filter is fitted in holes of cap and body. Bushing is provided with head to force off stem of tyre valve spool. Body accommodates threshold pressure pickup with diaphragm and switching unit and radio transmitter and storage cell. At operating tyre pressure diaphragm is curved, switching unit is open and no power is supplied to radio transmitter. In case of inadmissible drop of pressure diaphragm straightens out closing the switching unit and radio frequency alarm signal in form of coded signal is radiated by radio transmitter. This signal is received by radio receiver installed in driver's cab which starts alarm and/or visual information supply unit. EFFECT: enlarged operating capabilities. 5 cl, 1 dwg