Low tire pressure sensor and air switch therefor

Details Low tire pressure sensor and air switch therefor Low tire pressure sensor and air switch therefor

1979-07-18

1980-11-25

Yasich, Daniel M.

Signals and indicators

Vehicle

Tire inflation or deflation

731468, 340 58, B60C 2304

Patent

active

042351855

ABSTRACT:
A low tire pressure sensor for emitting a magnetic signal when the tire pressure reaches a low limit pressure includes a signal device having a magnet movable from a storage position to an actuated position by tire pressure applied to the magnet from an air switch. The air switch includes a bellows charged to a reference pressure and exposed to tire pressure for moving in response to tire pressure changes, and a three-way valve operated by the bellows for venting the signal device to atmospheric pressure when the tire pressure is normal and for closing the vent and applying tire pressure to the signal device to actuate it when the pressure drops below a preset low pressure.

REFERENCES:
patent: 2629086 (1953-02-01), Ainsworth et al.
patent: 2798449 (1957-07-01), Catlin
patent: 3479868 (1969-11-01), Boyer
patent: 3521230 (1970-07-01), Poole
patent: 3537068 (1970-10-01), Amundsen, Jr.
patent: 3719159 (1973-03-01), Davis
patent: 3827393 (1974-08-01), Winther
patent: 4130745 (1978-12-01), Hetzer

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