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Power tools

  • US 7,053,567 B2
  • Filed: 03/12/2003
  • Issued: 05/30/2006
  • Est. Priority Date: 03/15/2002
  • Status: Active Grant
First Claim
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1. A power tool comprising:

  • a tool bit;

    a motor that drives the tool bit;

    a body that houses the motor;

    a battery having power terminals detachably coupled to the body, wherein the battery supplies driving current to operate the motor;

    a power circuit that leads the driving current from the battery to the motor; and

    a control device that stops the motor after an engagement device on the battery begins physical disengagement from the body, but prior to the power terminals detaching completely from the body, thereby preventing an arc from being generated between the power terminals on the battery and the body.

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