High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Reexamination Certificate
2007-07-30
2011-10-04
Luebke, Renee (Department: 2833)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
C218S057000, C218S059000
Reexamination Certificate
active
08030590
ABSTRACT:
A gas-circuit breaker includes a cylinder, a stationary piston, and a moving piston. The cylinder has a moving contact that is fixed on one end of a rod and has a gas exhaust that faces a stationary contact. The rod is inserted into the cylinder. The stationary piston is fixed to the container, and is fitted in an opening of the cylinder to create a puffer chamber. Due to movement of the rod, the stationary piston compresses arc-extinguishing gas, and the gas blows onto the arc through gas exhaust. The moving piston partitions the puffer chamber into a first puffer chamber and a second puffer chamber. Sliding of the moving piston changes the capacity of the first puffer chamber and the second puffer chamber according to the difference in pressure in the first puffer chamber and the second puffer chamber.
REFERENCES:
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Partial English translation of Office Action mailed Aug. 16, 2011 in corresponding Japanese Patent Application No. 2007-047908.
Kohyama Haruhiko
Yoshida Daisuke
Yoshitomo Yuji
Buchanan & Ingersoll & Rooney PC
Fishman Marina
Luebke Renee
Mitsubishi Electric Corporation
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