| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive tire air pressure alarm capable of simply and easily informing of the tire pressure state. SOLUTION: This air pressure alarm is constituted from an outside frame body having a light emitting diode mounted thereon, an electric circuit chamber, a cylinder chamber and a valve core pressing member, a piston body comprising a pin type lithium battery moving vertically in the outside frame body, a press spring for imparting an energizing force downward to the piston body, and an electric circuit installed in the electric circuit chamber and having a structure for feeding the light emitting diode when the piston body is lowered.
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