High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Magnetic blowout
Patent
1996-12-19
1998-12-01
Friedhofer, Michael A.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Magnetic blowout
335172, H01H 3300
Patent
active
058441883
ABSTRACT:
A circuit breaker mechanism has a contact arm (56) forming a portion of an interruptable load current path through the circuit breaker and mounted with respect to a pivot (110) for swinging motion to break the current path. A spring-loaded, over-center operating mechanism includes a toggle mechanism having an upper toggle (74) and a lower toggle (122) coupled by a spring pin (128) to form a toggle joint about which the toggles can relatively pivot. The spring pin has a circular groove (128b) at which it operatively connects to the toggle joint, and a circular surface (128a) adjacent the groove is disposed in the path of travel of the contact arm as the contact arm swings to break the current path. A V-shaped notch (56a, 56b) in the contact arm, acts between the toggle joint and the contact arm to locate the toggle joint radially of the contact arm pivot and thereby cause the toggle joint to be displaced by the swinging contact arm along an arc such that a principal component of the contact arm force is directed in a sense that fully, or at least approximately, maximizes the effect of the swinging contact arm force on the toggle mechanism.
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Cella Stephen D.
McColloch Rex
McCoy Brian T.
Navarre Lawrence G.
Friedhofer Michael A.
Siemens Energy & Automation Inc.
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