Electricity: circuit makers and breakers – Electric switch details – Contact
Reexamination Certificate
2011-03-29
2011-03-29
Friedhofer, Michael A (Department: 2833)
Electricity: circuit makers and breakers
Electric switch details
Contact
C200S08200C, C200S276000
Reexamination Certificate
active
07915550
ABSTRACT:
An electrical circuit operating system for controlling operating of an aluminum processing bath includes an electrical contact device. The electrical contact device includes a tubular body of an electrically insulating material, the body including at least one circumferential slot receiving a seal member. A fastener is disposed in the tubular body. A conductive biasing element has a compressed connecting end engaged with the fastener, and an extending portion axially protracting from the compressed connecting end. A piston forms a portion of an electrical circuit. The electrical circuit is closed when the conductive biasing element is contacted by the piston. A piston rod is connected to the piston and is displaceable with the piston, the piston rod operable to break a crust of the aluminum processing bath.
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Friedhofer Michael A
Harness & Dickey & Pierce P.L.C.
Mac Valves Inc.
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