| 摘要 |
A tire pressure indicator (110) carried on a tire being monitored for inflation pressure. The indicator (110) includes a housing (112) enclosing an indicating member (130) bearing color coding (132) corresponding to proper inflation. Preferably, additional color coding (134, 136) is provided corresponding to excessive tire pressure and to low or inadequate tire pressure. The indicating member (130) occupies a chamber (114) having a coil spring (138) acting on the indicating member (130) from one direction, and air pressure from the tire acting on the indicating member from the other direction. Differential in forces acting on the indicating member (130) move the indicating member (130) such that the appropriate color coding (132, 134, 136) is revealed through a window (116) formed in the housing (116). Optionally, the pressure indicator (110) includes a conduit (140) enabling inflation of the tire without requiring removal of the indicator (110). In alternative embodiments, the novel indicator (110) threads to a conventional filling valve, and replaces the conventional filling valve.
|
