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Electric power tool having an improved impact cushioning mechanism

  • US 6,277,013 B1
  • Filed: 10/04/1999
  • Issued: 08/21/2001
  • Est. Priority Date: 10/05/1998
  • Status: Expired due to Term
First Claim
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1. An electric power tool, comprising:

  • a motor having a motor shaft which is rotatable in a predetermined direction and includes a first section;

    a first gear freely rotatably provided on the motor shaft, the first gear including a gear shaft which coaxially opposes the first section of the motor shaft and which has approximately the same diameter as that of the first section;

    a second gear provided on a spindle, the second gear engaging the first gear in order to transmit torque from the motor to the spindle; and

    a coil spring wound around the first section of the motor shaft and the gear shaft of the first gear, the coil spring having an approximately uniform cross-section and being wound in the direction opposite to the rotational direction of the motor shaft such that the coil spring transmits torque between the motor shaft and first gear.

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