Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Pressure gauge with self-generating power capability for a tire pressure indicator
 A pressure gauge is used with a receiver device of a tire pressure indicator for indicating the pressure condition in a pneumatic tire, and includes a casing formed with an aperture and adapted to be mounted on the tire such that pressure in the tire enters into the casing via the aperture, and a signal generating device disposed in the casing and capable of transmitting wirelessly a pressure signal to be received by the receiver device when the pressure in the tire is not within a predetermined normal operating pressure range. A power supplying device in the casing supplies electric power for operating the signal generating device, and includes a self-generating voltage unit which has a piezoelectric unit and an impact unit that is capable of continuously striking against the piezoelectric unit when the tire to which the casing is mounted is in motion so as to enable the piezoelectric unit to generate a voltage output, a rechargeable cell unit, and a rectifying-and-charging unit which interconnects the self-generating voltage unit and the rechargeable cell unit to permit charging of the rechargeable cell unit with the voltage output from the self-generating voltage unit. 
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Tien-Tsai
Huang