| 摘要 |
A drill includes a housing with a motor (20) coupled to an output spindle via a transmission. A mode collar can be rotatably mounted on the housing for movement that corresponds to different modes of operation. The mode collar can be coupled to an electronic switch (178) to operate a movable member (194) thereof. The coupling can include a switch housing including a slide member (188), an actuation spring member (192) and a return spring member (190). The mode collar can have a cam surface and a cam follower (92) in the form of a shift pin that moves the slide member (188), causing actuation of the switch. The actuation spring member (192) provides a biasing force that is sufficient to overcome a biasing force of a switch spring member to move the movable member (194) into the actuated position. The mode collar can also enable and disable contact between a fixed hammer member and a movable hammer member mounted around the output spindle.
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