Electricity: circuit makers and breakers – Special application – Pneumatic tire inflation responsive
Patent
1979-04-23
1981-09-29
Scott, James R.
Electricity: circuit makers and breakers
Special application
Pneumatic tire inflation responsive
H01H 3524
Patent
active
042924847
ABSTRACT:
A device responsive to a pressure loss in a vehicle tire includes a housing held in the vehicle wheel and a sealed chamber supported by the housing and situated in the inner space of the tire. One wall of the chamber is a deformable diaphragm which constitutes a movable contact and which cooperates with a stationary contact arranged in the chamber. The chamber contains gas which is at least at atmospheric pressure. The spring force of the diaphragm, its configuration as well as the pressure in the chamber are coordinated with one another in such a manner that at normal tire pressures the diaphragm is maintained relatively close to the stationary contact, while in case of a drop of the tire pressure below a predetermined value the diaphragm moves away from the stationary contact. The latter has a lead which is accessible externally of the wheel for connection, for example, to a signalling circuit.
REFERENCES:
patent: 3222641 (1965-12-01), Jacobus
patent: 3241112 (1966-03-01), Linkmeyer
patent: 3845260 (1974-10-01), Lohr
patent: 3944769 (1976-03-01), Wagner
patent: 3985984 (1976-10-01), Cappa
patent: 4071724 (1978-01-01), Lejeune
R. J. Sturm, IBM Tech. Disc. Bull., "A Magnetic Floating Elastic Diaphragm Switch", vol. 18, No. 4, Sep. 1975, pp. 1138, 1139.
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