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Multi-mode drill with an electronic switching arrangement

  • US 7,798,245 B2
  • Filed: 11/21/2007
  • Issued: 09/21/2010
  • Est. Priority Date: 11/21/2007
  • Status: Active Grant
First Claim
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1. A multi-mode drill comprising:

  • a housing having a motor including an output member;

    a rotary-reciprocatory output spindle journaled in the housing;

    a transmission disposed in the housing wherein the transmission operably couples the output member to the output spindle;

    a mode collar rotatably mounted on the housing and encircling the rotary output spindle and movable between a plurality of positions including a first mode collar position corresponding to a first mode of operation and a second mode collar position corresponding to a second mode of operation, the mode collar causing movement of a switch cam surface;

    a switch cam follower biased against the switch cam surface, the switch cam follower having a first cam follower position resulting from the mode collar being in the first mode collar position and a second cam follower position resulting from the mode collar being in the second mode collar position;

    an electronic speed control switch having a movable member, the movable member having an actuated position and a non-actuated position, and the electronic speed control switch comprising a switch spring member to bias the movable member toward the non-actuated position;

    an intermediate member operably mounted between the cam follower and the movable member of the electronic switch;

    an actuation spring member operably mounted between the cam follower and the movable member of the electronic speed control switch and associated with the intermediate member;

    wherein when the cam follower is in the first cam follower position, the intermediate member is in a first intermediate member position that causes the actuation spring member to provide a biasing force that is sufficient to overcome a biasing force of the switch spring member to move the movable member into the actuated position, and when the cam follower is in the second cam follower position, the intermediate member is in a second intermediate member position that causes the actuation spring member to provide a biasing force that is insufficient to overcome a biasing force of the switch spring member to thereby permit the switch spring member to move the movable member into the non-actuated position.

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