| 摘要 |
<p>A power drill (10) comprises a housing (12) having a motor (50) that includes an output member (52). A rotary output spindle (70,70') can be journaled in the housing. A transmission (72) is disposed in the housing and includes a first output gear (76) and a second output gear (78). The transmission can selectively couple the output member (52) to the output spindle through one of the first output gear (76) or the second output gear (78) for rotating the output spindle at one of a first speed or a second speed, respectively. A speed shift assembly (120) includes a guide plate and a user engageable member (34). The guide plate can selectively influence movement of the first and second output gears. The user engageable member can be movable between a first speed position and a second speed position. Movement between the first and second positions can cause the second output gear to at least partially nest into the first output gear.
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