| 摘要 |
<p>A tire valve including means for generating a wireless transmittable pressure drop indicating signal is provided. The valve comprises a valve foot attachable to a tire rim and a valve shaft extending from said valve foot. A signal generating means is mounted on said valve foot at a valve foot side remote from said valve shaft. Said signal generating means comprises a reference pressure chamber which is pressurized with a desired pressure. A diaphragm defines one end of said reference pressure chamber and is in communication with the tire pressure to be controlled. Further, said signal generating means includes a transmitter means, a power supply means, and switching means which is regularly held in an opened position, but which is closed with a diaphragm deflection, whereupon the transmitter means is activated. The transmitter circuit comprises a sequence control which terminates a signal transmission after a short duration thereof and resets the transmitter means in a state such that it is ready to become activated again upon opening and reclosing of said switching means.</p> |
