Low tire pressure indicator
First Claim
1. 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.
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Accused Products
Abstract
A tire pressure indication device is provided that continuously monitors pressure of a tire and instantaneously generates a visual display having an easy to read indication as soon as the tire pressure falls below a safe threshold limit. This device includes a dome shaped upper end. A two color dome shaped indicator element is disposed therein having two colors or other visually distinguishable markings which are visible through viewing areas. The dome element is rotatable in response to sensed tire pressure to provide a visual indication of low pressure and another visually distinct indication of safe pressure. The lower end of the body includes a connector to be fitted or threaded onto the valve stem of a tire. Multiple seals are provided within the device to substantially eliminate air or gas from escaping to the atmosphere. Thereby, the device can remain on the tire valve and monitor pressure for long periods of time.
60 Citations
10 Claims
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1. A tire pressure indicator comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification