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    • 7. 发明公开
    • Bit retention device
    • Werkzeugrückhaltevorrichtung
    • EP2223760A1
    • 2010-09-01
    • EP10154806.3
    • 2010-02-26
    • Black & Decker Inc.
    • Puzio, DanielKusmierski, Robert GTorok, Jeremy
    • B23B31/107B25B23/00
    • B25B23/0035B23B31/1071B25B23/0057Y10T279/17196Y10T279/17752
    • A bit retention device includes a shaft having a sidewall defining a hexagonal cavity extending from a first end thereof and a ball groove extending through the sidewall and communicating with the hexagonal cavity. A ball is disposed in the ball groove and a ball spring engages the ball and biases the ball toward the first end. An actuator sleeve surrounding the shaft includes an internal ramp engaging the ball. The internal ramp includes a shallow ramp portion having a first angle of inclination with respect to a center axis and a steep ramp portion having a second angle of inclination with respect to said center axis of said shaft that is greater than the first angle of inclination. A spring biased plunger assembly is disposed in the bore for biasing a bit received in the bore in a direction toward the insertion end.
    • 一种位保持装置包括具有限定从其第一端延伸的六边形腔的侧壁的轴和延伸穿过侧壁并与六边形腔连通的球槽。 球放置在球槽中,球弹簧接合球并朝着第一端偏压球。 围绕轴的致动器套筒包括与球接合的内部斜面。 内部斜坡包括相对于中心轴线具有第一倾斜角度的斜坡部分和相对于所述轴线的所述中心轴线具有大于第一倾斜角度的第二倾斜角度的陡坡部分。 弹簧偏置的柱塞组件设置在孔中,用于沿着朝向插入端的方向偏压容纳在孔中的钻头。