Optical pressure switch

Details Optical pressure switch Optical pressure switch

1975-07-21

1977-01-18

Caldwell, John W.

Communications: electrical

Selective

Having indication or alarm

73406, 200 6125, 250231R, B60C 2304, G01D 534

Patent

active

040042723

ABSTRACT:
A device for providing an optical indication of the pressure condition in a pressurized member, such as a pneumatic tire. A housing having a window therein carries a reflective surface, such as a mirror, which is mounted on a movable flap. One end of a plunger pin holds the mirror in alignment with the window with the other end of the pin resting on a diaphragm assembly which communicates with the internal pressure of the member. Light from a light source is directed in the window and under normal pressure conditions will be reflected by the mirror. If the internal pressure of the member drops below a predetermined value, the diaphragm will retract dropping the pin thereby moving the mirror out of alignment with the light source. The absence of reflected light is thus indicative of a low pressure condition and corrective measures can be taken.

REFERENCES:
patent: 2142602 (1939-01-01), Blethen
patent: 2197514 (1940-04-01), Barnes
patent: 3067617 (1962-12-01), Buck
patent: 3191440 (1965-06-01), Miller
patent: 3240946 (1966-03-01), Triplett

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