Tire valve cap for measuring air pressure
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United States of America Patent
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-
Oct 13, 1998
Grant Date -
N/A
app pub date -
Sep 20, 1996
filing date -
Oct 20, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the state where a tire valve cap body has been fixedly screwed onto a valve mouthpiece, a top cover is pushed to open a tire valve, allowing introduction of a tire air pressure. A piston is slidably incorporated in a cylinder chamber defined within the top cover and is urged by a return spring. Upon the introduction of the tire air pressure, the piston is displaced to a position at which the biasing force of the return spring balances with the force of the introduced air pressure. An indication mechanism is provided to indicate, through an indication window formed in a cylinder member, a position of the piston member displaced by the tire air pressure introduced, thereby indicating a measurement value of the tire air pressure.
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