Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Reexamination Certificate
1999-12-30
2001-07-17
Barrera, Ray (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
C200S244000, C218S022000
Reexamination Certificate
active
06262642
ABSTRACT:
BACKGROUND OF INVENTION
This invention relates to circuit breaker, and, more particularly, to a circuit breaker rotary contact arm arrangement.
Circuit breakers having a current interrupting module within a rotary contact arm arrangement whereby the circuit breaker movable contact arms are arranged at the opposite ends of the movable contact carrier are able to interrupt circuit current at a faster rate than circuit breakers having a movable contact carrier with a contact arranged at one end. U.S. Pat. No. 5,310,971 entitled Rotary Contact System for Circuit Breakers, describes a rotary contact arm that employs rollers between the contact springs and the contact arm to provide a uniform force distribution between the fixed contacts attached to the circuit breaker line and load straps and the movable contacts arranged at the opposite ends of the movable contact arm. One problem associated with a non-uniform force distribution between the fixed and movable contacts is the possibility of excessive contact erosion on the pair of contacts at the lower force points along the fixed contact surface.
U.S. patent application Ser. No. 09/384,908 filed Aug. 27, 1999 entitled Rotary Contact Assembly For High Ampere-Rated Circuit Breakers describes connecting the circuit breaker contact springs with the movable contact arm by means of pivotally-arranged links to compensate for contact wear and erosion over long periods of extensive circuit interruption.
SUMMARY OF THE INVENTION
In an exemplary embodiment of the invention, a rotary contact arrangement for circuit breakers of the type including a pair of contact springs arranged on each side of the rotary contact arm, has the contact springs interconnected between the rotors and the contact arm via a pair of U-shaped levers. The U-shaped lever sidearms interact with the perimeter surfaces of the rotors whereas the bights of the U-shaped levers interact with the shaped surfaces of the contact arm to insure uniform spring force between the fixed and movable contacts.
Uniform contact pressure between both pairs of fixed and movable contacts in a rotary type circuit breaker is provided without having to interpose rollers between the contact springs and the movable contact arm, especially when used in multi-pole circuit breakers that require a separate movable contact arm in each of the separate poles
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Barrera Ray
Cantor & Colburn LLP
General Electric Company
Horton Carl B.
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