Plural set point pressure responsive switching apparatus utilizing a single pressure sensing driver element
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United States of America Patent
Stats
-
Apr 2, 1991
Grant Date -
N/A
app pub date -
Sep 20, 1989
filing date -
Sep 20, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An actuator having a spring biased button abutting a first electric switch operator button and a flange spaced from an operator button of a second electric switch is driven by a pressure sensing bellows against a Belleville snap spring, the actuator moving abruptly against an intermediate stop upon breakover of the snap spring to operate the first switch, the bellows subsequently driving the actuator and intermediate stop coincidentally against a second Belleville snap spring, and the actuator moving abruptly against a second stop upon breakover of the second snap spring to actuate a second electric switch and depress the spring biased button. Adjustment means are provided for adjusting the range for each Belleville snap spring to provide distinct pressure set points and independent electric circuits, and to adjust both set points simultaneously.
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