TIRE PRESSURE INDICATOR Russian patent published in 2004 - IPC

FIELD: automotive industry.

SUBSTANCE: proposed device contains outer shell rotating with threaded case which can be turned onto connecting tube of tire inflating valve, pusher with cavity closed by deformable plate, bellows separating chamber over pusher from second chamber under pusher. Said plate flexes downwards when atmospheric pressure acts onto cavity and pressure in tire exceeding preset value acts onto first chamber. Third chamber communicates with first chamber. Third chamber is limited by outer wall of bellows and inner shell. Fourth chamber is located inside tube. Said fourth chamber is separated from second chamber when pusher rod tightly closes gasket. When pressure in tire drops below preset value, passages connect first and third chambers with second chamber and atmosphere.

EFFECT: improved accuracy of operation.

10 cl, 6 dwg