Fluid handling – Inflatable article – With gauge or indicator
Patent
1990-09-07
1991-08-20
Rivell, John
Fluid handling
Inflatable article
With gauge or indicator
116 34R, 731465, 340447, B60C 2302
Patent
active
050405616
ABSTRACT:
A tire valve comprises means for generating a wireless transmittable pressure drop indicating signal. 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 admittable with a desired pressure. A diaphragm defines said reference pressure chamber and is admittable 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 hold 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 to become activated again.
REFERENCES:
patent: 3537068 (1970-10-01), Amundsen, Jr.
patent: 3760350 (1973-09-01), Johnson
patent: 4037192 (1977-07-01), Cowit
patent: 4048614 (1977-09-01), Shumway
patent: 4174515 (1979-11-01), Marzolf
patent: 4177671 (1979-12-01), Ichihara et al.
patent: 4562874 (1986-01-01), Scheller
patent: 4816802 (1989-03-01), Doerksen et al.
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