Pneumatic snap action switch

Electricity: circuit makers and breakers – Fluid pressure – Diaphragm

Patent

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Details

200 83N, 200 83A, H01H 3534

Patent

active

056190220

ABSTRACT:
A miniaturized pneumatic snap action switch includes a glass or metallized ceramic body that has a convoluted metal diaphragm closing the open end with a glass to metal seal. The interior of the switch is provided at a desired pressure by a sealable tubulation port and the switch actuation members include a C-spring and a Belleville spring or washer sealed inside the switch housing. The switchable electrical path is from the metal diaphragm, through the C-spring and Belleville spring, to a centrally arranged conductive termination pin embedded in the closed end of the body. The combination of the C-spring and Belleville spring provide the snap action, and the C-spring has two hemispherical engagement portions that centralize the forces through the center line of the switch. The switch is intended for miniature applications and the switch body is less than 0.75 inches in diameter.

REFERENCES:
patent: 3689719 (1972-09-01), Phillips et al.
patent: 3793495 (1974-02-01), Heap
patent: 4620073 (1986-10-01), Yokota et al.
patent: 5177579 (1993-01-01), Jerman
patent: 5338908 (1994-08-01), Rahman et al.

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