High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices
Reexamination Certificate
1999-08-31
2001-06-05
Scott, J. R. (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
C218S022000, C218S143000, C218S146000, C218S150000, C218S157000, C335S195000, C335S201000
Reexamination Certificate
active
06242707
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to the field of high power voltage, circuit interruption devices and more particularly to arc quenching expulsion current limiting devices.
Current limiting devices require the rapid development of arc voltage. Prior art shows the use of conductive material filled polymers as contact materials (Ref. U.S. Pat. No. 4,778,958). Such contact materials, while showing good arc quenching capability, show high contact resistance and high erosion rate.
BRIEF SUMMARY OF THE INVENTION
In an exemplary embodiment of the invention, a current limiting device for protecting electrical circuits includes a pair of separable electrodes disposed within a case. Each electrode has at least one opening with an ablative member abutting the opening at an outer surface of the electrode. A spring is disposed between each ablative member and the case for urging the electrodes together.
In another embodiment of the present invention, a current limiting device includes a first and second separable electrodes disposed in the case. The second electrode has at least one opening for receiving a member formed of ablative material. The ablative member includes a leg portion that passes through the opening of the second electrode to contact the first electrode. An ablative member spring urges the ablative member against the first electrode, and an electrode spring urging the second electrode against the first electrode.
REFERENCES:
patent: 4170394 (1979-10-01), Conway
patent: 4562320 (1985-12-01), Van Der Scheer
patent: 4594489 (1986-06-01), Gengenbach et al.
patent: 4752660 (1988-06-01), Yokoyama et al.
patent: 4778958 (1988-10-01), Mayer et al.
Duggal Anil R.
Mody Hemant K.
Cantor & Colburn LLP
General Electric Company
Horton Carl B.
Scott J. R.
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