High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Contact structure
Patent
1995-05-17
1997-06-03
Gellner, Michael L.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Contact structure
218 6, H01H 3314
Patent
active
056356927
ABSTRACT:
A contact arrangement is provided for engaging first and second stationary contacts in a predetermined sequential manner, for example so as to appropriately provide a pre-insertion function via the first contact and prior to engagement of the second contact that provides a circuit-closing function in a main current path. In a preferred arrangement, the moving contact of the contact arrangement includes first and second contact surfaces that are spaced apart and parallel to each other, the first and second contact surfaces of the moving contact sequentially engaging the first and second stationary contact surfaces respectively during closing movement. In a specific embodiment, the first and second contact surfaces are provided by a unitary contact member having a circular cross-section, this arrangement being especially suited for a switch where the contact member is rotated as it moves to the closed position.
REFERENCES:
patent: 3584170 (1971-06-01), Bould
patent: 3588406 (1971-06-01), Bernatt
patent: 3787651 (1974-01-01), Chabala et al.
patent: 4107487 (1978-08-01), Evans
patent: 4695918 (1987-09-01), O'Leary
patent: 5013876 (1991-05-01), Chabala
patent: 5160817 (1992-11-01), Wiktor et al.
Friedhofer Michael A.
Gellner Michael L.
Lapacek James V.
S & C Electric Company
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