Patent ID: 8622401
Filing Date: 2014-01-07
Classification: B23B,B25B,Y10T

Abstract:
1. A bit retention device, comprising: a shaft having a sidewall defining a bit receiving cavity extending from a first end thereof and a ball groove extending through said sidewall and communicating with said bit receiving cavity; a ball disposed in said ball groove; a ball spring engaging said ball and biasing said ball toward said first end; an actuator sleeve surrounding said shaft and including an internal ramp engaging said ball, said internal ramp including a first shallow ramp portion having a first angle of inclination with respect to a center axis of said shaft, a second steep ramp portion having a second angle of inclination with respect to said center axis of said shaft that is greater than said first angle of inclination, said second steep ramp portion having a smaller diameter than said first shallow ramp portion and a third generally cylindrical portion disposed adjacent to said second steep ramp portion with said second steep ramp portion disposed between said first shallow ramp portion and said third generally cylindrical portion, wherein each of said first shallow ramp portion, said second steep ramp portion and said third generally cylindrical portion are adapted to engage an outer surface of the ball.