G - Physics – 08 – B
Patent
G - Physics
08
B
325/44, 340/145.
G08B 21/00 (2006.01) B60C 23/04 (2006.01)
Patent
CA 1218415
PIEZOELECTRIC REED POWER SUPPLY FOR USE IN ABNORMAL TIRE CONDITION WARNING SYSTEMS Abstract A device is provided for sensing the condition of a pneumatic tire preferably of the type used on an automobile wherein the tire is mounted on a tire rim and the tire is subject to normal vibra- tions. The device comprises a housing, a means for mounting the housing to the tire rim, sensing means for monitoring the condi- tion within the tire, circuit means operatively connected to the sensing means for generating radio signals indicative of the tire condition, power supply means operatively connected to the circuit means and means for receiving the radio signals. The power supply means includes a piezoelectric reed having a base portion and an end portion. The base portion is elastomerically bonded to the housing. A tuning mass member is mounted to the end portion and is configured for mating abutment against stop members which limit the flexure stroke of the piezoelectric reed and inhibit compound bend- ing of the reed. The tuning mass member includes an outer weighted casing and an inner elastomeric portion insulating the reed from physical shocks to the outer casing and from electrical shorts across the casing. The tuning mass member is sized relative to the piezoelectric reed to obtain a resonant frequency of vibration of the power supply induced by common road vibrations during wheel operation. The reed is symmetrically configured about a radiating center line of the tire.
440631
Imperial Clevite Inc.
Marcoux & Sher Swabey Mitchell Houle
LandOfFree
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