Device for detecting and indicating low pressure and high heat i

Details Device for detecting and indicating low pressure and high heat i Device for detecting and indicating low pressure and high heat i

1979-07-23

1981-01-20

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

200 6123, B60C 2306

Patent

active

042465672

ABSTRACT:
A device for detecting and indicating low pressure or excessive heat in a pneumatic tire. A piezoelectric crystal is operatively associated with a temperature expansible member which expands in response to elevated temperatures. The combined dimensions of the piezoelectric crystal and the expansible member are selected so that one surface of the expansible member is a predetermined distance from the inside surface of the tire. Elevated temperatures cause the expansible member to expand and contact the interior surface of the pneumatic tire resulting in the compression of the piezoelectric crystal and the generation of an output signal. Additionally, deflation of the pneumatic tire causes the tire to deflect so that the predetermined spacing between the interior of the tire and the expansible pellet is reduced and the pellet contacts the inside surface of the tire resulting in the generation of an output signal. The output signal is used to actuate a spark gap to warn of an unsafe tire condition.

REFERENCES:
patent: 4117452 (1978-09-01), Snyder et al.

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