Patent ID: 7428918

Claim:
A system comprising: a rotatable shaft; a rotor mounted on said shaft, said rotor comprising a stopping surface and a latch, the latch being mounted to said rotor, such that when said rotor rotates in a first direction at greater than a threshold angular velocity, said latch moves from a first latch position to a second latch position; a plate, comprising means for restraining and an engagement point, the engagement point lying in the path of said latch when said latch is in said second latch position, the engagement of said engagement point and said latch causing said plate to move from a first plate position to a second plate position; a pawl comprising means for holding and means for biasing, wherein said means for holding engages said means for restraining on said plate when said plate is in said first plate position, substantially preventing movement of said pawl, and where said means for holding does not substantially engage said means for restraining on said plate when said plate is in said second plate position, and wherein said means for biasing biases said pawl when said means for holding on said pawl is not engaged with said means for restraining on said plate, such that said pawl engages with said stopping surface of said rotor, causing said rotation of said rotor in said first direction to cease.