Electricity: circuit makers and breakers – Fluid pressure – Piston
Reexamination Certificate
2009-02-24
2010-06-08
Friedhofer, Michael A (Department: 2833)
Electricity: circuit makers and breakers
Fluid pressure
Piston
C200S0830SA, C200S0830SA
Reexamination Certificate
active
07732722
ABSTRACT:
A hermetically sealed pressure switch apparatus and method includes a metal bellows directly installed at an inlet port for providing hermetic sealing thereof. A spring (e.g. a wave spring) can be connected in parallel or series combination with the metal bellows. The metal bellows is capable of being extended when an input pressure is applied which in turn compress the wave spring. The compression of the spring transfers a required motion to a plunger associated with an electrical switch in order to actuate the electrical switch when a certain pressure relative to a perfect vacuum is attained. The metal bellows and the spring can be pre-compressed utilizing the plunger in order to maintain switch set point accuracy and spring stiffness.
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Araganji Vijayshekhar
Haf Kevin
Mahalingam Bharath
Singh Aparajita
Friedhofer Michael A
Honeywell International , Inc.
Ingrassia Fisher & Lorenz P.C.
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