| 摘要 |
An inflation pressure indicator (100) for pneumatic tires for vehicles has a body (101) mountable on a wheel rim (149) to which a tire is fitted. A piston (122) is slidably mounted in a bore (102) in the body (101), and, at a preselected pressure, moves in the bore (102) against the compression spring (125) to a position adjacent a datum line (136) on the body (101). A tire valve (130) is fitted to the piston (122) to enable the tire to be inflated or deflated, when an air hose fitting is connected to the body (101). By selective injection moulding of the body (101) from polycarbonate, the length of the body (101) will increase with increased heat so that the indicator (100) will correctly indicate the cold tire pressure when the tire is hot.
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