| 摘要 |
A retaining device for a power drill has multiple brake shoes movably received in the housing, a cam securely engaged with the output shaft to selectively abut the brake shoes to move and engage with an inner periphery of a through hole and a driving disk provided to drive the output shaft and to limit the movement of the brake shoes in the housing. When the brake shoes are moved to engage with the inner periphery defining the through hole, a locking effect is provided to the driving disk so as to the output shaft.
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