Importance

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Abstract

A multi-stage pressure-to-electric switch assembly includes a top casing provided with a pressure receiving chamber, a bottom casing integrally secured to the top casing in closing relation to the pressure receiving chamber, and a diaphragm clamped between the top casing and the bottom casing to be in sealing, closing relation to the pressure receiving chamber. This diaphragm is provided with three spaced-apart pressure response switch control portions, each portion including a switch control button. Three two-position electrical switches are fixedly supported with respect to the bottom casing. Three hollow, externally threaded switch control sleeves are aligned between the diaphragm control buttons and the switches. A switch operating control nut is threadably mounted on each of the switch control sleeves, and a switch operating plunger extends through each control sleeve between the diaphragm button and a switch. A coil spring seated on the switch operating pressure control nut exerts force against the diaphragm button. This force is adjusted by the positioning of the control nut on the control sleeve. When the pressure in the pressure receiving chamber exerts sufficient force on a particular diaphragm button, the strength of the spring is overcome, and its switch operates.

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First Claim