| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple pneumatic pressure determination device for a tire capable of solving the problem of the present state of having to determine the pneumatic pressure of a tire of a bicycle by depending on one's senses, such as by pressing the tire with fingers, because a pneumatic meter can be used for a tire of a motorcycle or an automobile but it is difficult to be used for a tire of a bicycle due to the structure of a valve of the bicycle. SOLUTION: Since the ground contact length in the rolling direction of the tire is inversely proportioned to the pneumatic pressure of the tire, the ground contact length in the rolling direction of the tire should be detected. To do so, a switch which can be turned on by a pressure from above is mounted in series at equal intervals in a straight line on a firm base with a flat surface, and when the switch is turned on, LEDs are lit for a predetermined length of time. If the number of the lit LEDs are in proportion to the ground contact length of the rolling direction of the tire, it indicates the ideal pneumatic pressure. As the number of the lit LEDs decrease from the ideal number of the lit LEDs, it indicates that the pneumatic pressure is high. In the contrary, when there are more lit LEDs than the ideal number, a low pneumatic pressure is detected. When the pneumatic pressure is at a level where it is not high enough and the tire needs to be filled with air, an alarm buzzer is sounded. COPYRIGHT: (C)2004,JPO
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