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Activation arm configuration for a power tool

  • US 20050218174A1
  • Filed: 03/31/2005
  • Published: 10/06/2005
  • Est. Priority Date: 04/02/2004
  • Status: Active Grant
First Claim
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1. A power tool comprising:

  • a structure;

    a flywheel coupled to the structure;

    a driver that is translatable along a driver axis; and

    an activation arm assembly having a first arm, a second arm, a third arm, a roller, a first spring and a second spring, the first arm being pivotally coupled to the structure at a first point, the second arm being pivotally coupled to the first arm at a second point, the third arm being pivotally coupled to the second arm at a third point, the roller being mounted on the third arm, the first spring biasing the second arm about the second point in a rotational direction toward the driver, the second spring biasing the third arm about the third point in the rotational direction toward the driver;

    wherein rotation of the activation arm about the first point in the rotational direction toward the driver engages the driver to both the roller and the flywheel to thereby transfer energy from the flywheel to the driver.

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