Patent ID: 6911903

Claim:
A tire pressure indicator for coupling to a threaded valve stem comprising: a generally dome shaped cover having a cover peak, a cover interior cavity and a lower peripheral edge, said cover having alternating opaque and transparent segments extending at least partially between said cover peak and said lower peripheral edge of said cover, said cover having a longitudinal axis extending through said peak; a generally dome shaped indicator having a dome peak, a lower peripheral edge and an indicator interior cavity, said indicator having alternating segments having first and second different visual characteristics, said indicator segments extending at least partially from said dome peak to said lower peripheral edge of said indicator, said dome shaped indicator having a pivot axis coincident with said longitudinal axis, said indicator being disposed within said cover interior cavity, rotatable around said pivot axis and axially movable with respect to said cover along said longitudinal axis in response to variations in air pressure applied to said tire pressure indicator; first and second camming mechanisms, said first camming mechanism operative during axial movement of said indicator in a first direction responsive to air pressure applied to said tire pressure indicator in excess of a first pressure limit to cause rotation of said indicator to a first rotational orientation; said second camming mechanism operative during axial movement of said indicator in a second direction opposite to said first direction and responsive to air pressure applied to said tire pressure indicator below a second pressure limit to cause rotation of said indicator to a second rotational orientation; said segments of said indicator having said first visual characteristic being visible through said transparent segments of said cover when said indicator is in said first rotational orientation and said segments of said indicator having said second visual characteristic being visible through said transparent segments of said cover when said indicator is in said second rotational orientation.