Low tire pressure detector

Details Low tire pressure detector Low tire pressure detector

1977-11-14

1979-01-09

Yusko, Donald J.

Communications: electrical

Selective

Having indication or alarm

200 6125, 200 83C, 200 83L, B60C 2304

Patent

active

041341023

ABSTRACT:
A low tire pressure detector and magnetic signal sending unit includes a bellows charged to a reference pressure for moving a magnet from a shielded position to a signal emitting position when tire pressure operating outside the bellows decreases to a predetermined value. A latching force is established by the magnet to operate against the bellows force to help maintain the magnet in the shielded or non-signalling position. The magnitude of the latching force is controlled by a polepiece of thin cross section which saturates under the influence of the magnet to limit the latching force to a fixed value. The spring force of the bellows is sufficient in the absence of a pressure differential to overcome the latching force and move the magnet to signalling position. A ferrous slug mounted on the movable end of the bellows is magnetically coupled to the magnet assembly to form a releasable connection between the magnet assembly and the bellows.

REFERENCES:
patent: 3521230 (1970-07-01), Poole
patent: 3654601 (1972-04-01), Munson et al.
patent: 3977355 (1976-08-01), Lorenz et al.
patent: 3978448 (1976-08-01), Vago
patent: 3982225 (1976-09-01), Schlanzky

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