Pressure drop signal generating valve cap for pneumatic tires

Details Pressure drop signal generating valve cap for pneumatic tires Pressure drop signal generating valve cap for pneumatic tires

1990-09-07

1991-08-20

Rivell, John

Fluid handling

Inflatable article

With gauge or indicator

137232, 340447, 116 34R, 731465, B60C 2302

Patent

active

050405624

ABSTRACT:
A valve cap adapted to be screwed onto the tire valve of a pneumatic tire generates a wireless transmissible pressure drop indication signal. The valve cap comprises a valve cap housing comprising a pressure chamber and a reference chamber. The non-blockable pressure chamber is admittable with the tire pressure to be controlled. The reference chamber is admitted with a desired pressure whenever the valve cap is screwed onto the tire valve. A signal generating means including transmitter means, power supply means and switching means is provided within said valve cap housing. The switching means comprises a conductor section fixedly arranged within the pressure chamber in a short distance to a rest position of a deflectable diaphragm. Any tire pressure drop will converge the diaphragm into the pressure chamber and will complete an electrical circuit whereupon a transmitter circuitry is supplied with voltage/current, and the transmitter means generates a pressure drop indicating signal of limited duration.

REFERENCES:
patent: 3215978 (1965-11-01), Brown et al.
patent: 3430196 (1969-02-01), Dalton
patent: 3533063 (1970-10-01), Garcia
patent: 3713092 (1973-01-01), Ivenbaum
patent: 4037192 (1977-07-01), Cowit
patent: 4048614 (1977-09-01), Shumway
patent: 4174515 (1979-11-01), Marzolf
patent: 4363020 (1982-12-01), Venema
patent: 4737760 (1988-04-01), Huang et al.
patent: 4793277 (1988-12-01), Haas et al.
patent: 4954677 (1990-09-01), Alberter et al.

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