Patent ID: 6531960
Filing Date: 2003-03-11
Classification: B60C

Abstract:
A tire pressure indicator comprising:a valve connector for connecting the tire pressure indicator to a tire; a cam mechanism having a body with a bottom surface coupled to said valve connector for sensing pressure from the tire and a piston disposed to slide axially within said body having a plurality of legs each terminating in a respective outer cam surface and said legs extending outward through openings in a top surface of said body; and an indicator having a cylindrical portion and a plurality of ribs extending inward from the cylindrical portion, each of the ribs contacting a respective outer cam surface; said indicator being rotatable in response to axial movement of said piston, said outer cam surfaces of said legs providing non-linear rotation of said indicator; said indicator having a visible display portion including a first visual indication when pressure from the tire is in a safe state equal to or above a predetermined safe threshold level and a second visual indication when pressure from the tire is in a warning state below said predetermined safe threshold level; said piston moving axially in response to tire pressure and operative to provide a non-linear rotational displacement of said indicator to trigger an abrupt transition from said first visual indication to said second visual indication in response to the tire pressure changing between said safe and warning states.