Patent ID: 7411145
Filing Date: 2008-08-12
Classification: H01H

Abstract:
1. A decoupling assembly for a charging assembly for an electrical switching apparatus, said charging assembly structured to couple a motor assembly shaft to a cam shaft, said cam shaft supporting a cam structured to engage and move a rocker arm assembly to charge a circuit breaker charging assembly closing spring, said cam having an outer surface with the following features in sequence, a minimal diameter, a maximum diameter identified as top dead center, a downslope, a stop diameter, and a step back to the minimal diameter, wherein as said cam rotates from a position wherein said rocker arm assembly engages said cam outer surface immediately adjacent to said minimal diameter to a position wherein said rocker arm assembly engages said cam at said top dead center, the counter-force applied to said cam shaft increases, and, as said rocker arm assembly engages said cam downslope, the counter-force applied to said cam shaft decreases, said circuit breaker further including a latch assembly structured to selectively stop the rotation of said cam when said rocker arm assembly engages said stop diameter, said decoupling assembly comprising: a sprocket fixed to said motor shaft and structured to rotate in a charge direction, said sprocket having an outer surface with a plurality of teeth; a hub assembly having a pawl structured to move between a first position, wherein said pawl engages said sprocket teeth, and a second position, wherein said pawl does not engage said sprocket teeth; a lifter pin assembly having a lifter pin, said lifter pin structured to selectively move said pawl between said first position and said second position; and said hub assembly rotatably coupled to said sprocket and structured to selectively move with said sprocket when said pawl engages said sprocket teeth and to float on said sprocket when said pawl does not engage said sprocket teeth.