Patent ID: 8063532

Claim:
A motor of a spring charging device for an air circuit breaker, the motor comprising: a first frame comprising a first bearing insertion hole, a first brush holder insertion hole, and a second brush holder insertion hole; a second frame comprising a second bearing insertion hole and a shaft through hole; a first bearing positioned in the first bearing insertion hole; a second bearing positioned in the second bearing insertion hole; a shaft rotatably coupled to the first and second frames via the first bearing and the second bearing and passing through the shaft through hole of the second frame; a commutator coupled to the shaft; a stator winding configured for rotating the shaft; a first brush holder comprising a first latch proximate a first end of the first brush holder and projecting from an external wall of the first brush holder, and a second latch proximate a second end of the first brush holder and projecting from the external wall, the first brush holder positioned within the first brush holder insertion hole and connected to the stator winding via a first electric line; a second brush holder comprising a first latch proximate a first end of the second brush holder and projecting from an external wall of the second brush holder, and a second latch proximate a second end of the second brush holder and projecting from the external wall, the second brush holder positioned within the second brush holder insertion hole and connected to the stator winding via a second electric line; a first brush positioned within the first brush holder and elastically supported by a spring for biasing the first brush into contact with the commutator; and a second brush positioned within the second brush holder and elastically supported by a spring for biasing the second brush into contact with the commutator, wherein the first brush holder insertion hole comprises a stumbling sill at an inner lateral surface of the first brush holder insertion hole, wherein the second brush holder insertion hole comprises a stumbling sill at an inner lateral surface of the second brush holder insertion hole, wherein the first latch of the first brush holder is configured for latching with the stumbling sill of the first brush holder insertion hole, wherein the second latch of the first brush holder is configured for latching with an upper end of the first brush holder insertion hole, wherein the first latch of the second brush holder is configured for latching with the stumbling sill of the second brush holder insertion hole, and wherein the second latch of the second brush holder is configured for latching with an upper end of the second brush holder insertion hole.