Electricity: circuit makers and breakers – Special application – Pneumatic tire inflation responsive
Patent
1995-09-25
1997-06-03
Tolin, Gerald P.
Electricity: circuit makers and breakers
Special application
Pneumatic tire inflation responsive
731465, 200 83Y, 340442, H01C 1034
Patent
active
056356919
ABSTRACT:
A pneumatic sensor switch for giving a warning signal if a pneumatic vehicle tire has too low pressure has a gas-filled chamber, separated from the inflation space in the tire by a flexible diaphragm cooperating electrically with a metal part in the chamber to form an electric switch open at safe pressures in the tire and closed at dangerous lower pressures. There is an electric circuit with battery and transmitter to transmit warning signals to the outside if the switch is closed. There may be a second chamber with an electric switch contact, filled with gas at a lower pressure and also separated from the inflation space in the tire by a flexible diaphragm so that the contact is open at atmospheric pressure therein and closed by the diaphragm at higher pressures. The electric switches of both chambers are connected in series so that a warning signal is given only at pressures in the dangerous range, when both switches are closed, and not at atmospheric pressure nor at safe operating pressures in the tire.
REFERENCES:
patent: 3938076 (1976-02-01), Hayashi
patent: 4048614 (1977-09-01), Shumway
patent: 5040562 (1991-08-01), Achterholt
patent: 5289161 (1994-02-01), Huang
patent: 5325901 (1994-07-01), Olney
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