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METHOD AND DEVICE FOR TIGHTENING JOINTS

  • US 20110079406A1
  • Filed: 05/08/2009
  • Published: 04/07/2011
  • Est. Priority Date: 05/08/2008
  • Status: Active Grant
First Claim
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1. An electric assembly device for tightening threaded fasteners, comprising:

  • a housing;

    a variable speed rotation motor;

    an output shaft connected to the motor and rotatable about a rotation axis;

    coupling means provided on the output shaft for coupling the output shaft to a threaded fastener to be tightened;

    wherein the housing is arranged to be manually supported by an operator and is angularly displaceable relative to the rotation axis;

    determining means for determining an angular displacement of the housing relative to the rotation axis during tightening of the threaded fastener; and

    a control unit which controls a rotation speed of the motor during tightening in relation to the determined angular displacement of the housing; and

    wherein the rotation speed of the motor is arbitrarily determinable by the operator by angularly displacing the housing relative to the rotation axis in one of a rotation direction of the output shaft and a direction opposite to the rotation direction of the output shaft, to thereby correspondingly determine a tightening speed of the fastener.

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