Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
276 words
In a circuit breaker having stationary contactors provided respectively for all of the poles thereof; movable contactors provided respectively for all of the poles in correspondence to said stationary contactors; stationary contacts provided respectively on the end portions of said stationary contactors; and movable contacts provided respectively on the end portions of said movable contactors, said movable contactors being movable from said stationary contactors by electromagnetic force to open respective circuits before said circuit breaker is opened by an overcurrent tripping device when a large current such as short-circuit current flows, the improvement comprising holders adapted to hold said movable contactors of all of the poles mounted on a common rotatable insulating rod (25), one of said holders (6) holding one of said poles having latch means (22) rotatable around a first rod 7 provided on said holder; a second rod (20) normally engaged by said latch means, and guide slots (19) in said one holder for guiding said second rod, wherein said second rod is movable in said guide slots when disengaged by said latch means, and an engaging spring (24) operating to engage said latch means with said second rod until a rotational moment acting on said latch due to a repulsive electromagnetic force generated in any one of the poles or the sum of repulsive electromagnetic forces generated in all of the poles reaches a predetermined value, whereupon said one holder rotates with said guide slots moving relative to said second rod, and said movable contactors of all of the poles are simultaneously separated from said stationary contactors to open the respective circuits with the aid of said insulating rod and said holders.
Claim 2
Dependent Claim
276 words
In a circuit breaker having stationary contactors provided respectively for all of the poles thereof; movable contactors provided respectively for all of the poles in correspondence to said stationary contactors; stationary contacts provided respectively on the end portions of said stationary contactors; and movable contacts provided respectively on the end portions of said movable contactors, said movable contactors being movable from said stationary contactors by electromagnetic force to open respective circuits before said circuit breaker is opened by an overcurrent tripping device when a large current such as short-circuit current flows, the improvement comprising holders adapted to hold said movable contactors of all of the poles mounted on a common rotatable insulating rod (25), one of said holders (6) holding one of said poles having latch means (22) rotatable around a first rod 7 provided on said holder; a second rod (20) normally engaged by said latch means, and guide slots (19) in said one holder for guiding said second rod, wherein said second rod is movable in said guide slots when disengaged by said latch means, and an engaging spring (24) operating to engage said latch means with said second rod until a rotational moment acting on said latch due to a repulsive electromagnetic force generated in any one of the poles or the sum of repulsive electromagnetic forces generated in all of the poles reaches a predetermined value, whereupon said one holder rotates with said guide slots moving relative to said second rod, and said movable contactors of all of the poles are simultaneously separated from said stationary contactors to open the respective circuits with the aid of said insulating rod and said holders.
Claim 3
Dependent Claim
32 words
The circuit breaker of claim 1 further comprising a switching handle, an articulated link mechanism coupled by a common pin and a switching spring coupling said common pin to said switching handle.
Claim 4
Dependent Claim
20 words
The circuit breaker of claim 2 wherein said second rod is mounted on one member of said articulated link mechanism.
Claim 5
Dependent Claim
25 words
The circuit breaker of claim 1 further comprising a bias spring disposed to bias said latch means in a direction opposite to said engaging spring.
Claim 6
Dependent Claim
38 words
The circuit breaker of claim 2 further comprising a second latch having an engaging pin, said link mechanism having one member rotatable about said engaging pin, said second latch having a receiving portion for an overcurrent tripping device.
Claim 7
Dependent Claim
25 words
The circuit breaker of claims 1, 2, 3, 4 or 5 further comprising an insulating barrier inserted between said stationary contactors and said movable contactors.