| 摘要 |
A warning device for the inadequate tire air pressure, includes an outer shell which includes all assembly members and can be screwed to a tire's air valve; an operating needle plate which acts to operate and open the tire valve as the outer shell is screwed thereto; a resilient hood undertaking a compression from the tire air pressure; a switch bar which moves along with the resilient hood under compression; and a PC board with the warning sounds and lights circuit. As screwedly mounted to each tire valve of a vehicle's, this device because of function of the operating needle plate can allow air communication and thus make the air pressure in the resilient hood outer front area equal to tire's regulated air pressure, and that acts resilient hood to move the switch bar which then causes the warning sounds and lights circuit to be open circuit. Once the tire air pressure reduces below predetermined standard, the reduced air pressure acts less to resilient hood and the switch bar moves back to make contact with the circuit to generate sounds and lights warning.
|
