Patents Represented by Law Firm Haves & Reinsmith
  • Patent number: 5637968
    Abstract: A method and apparatus for correcting torque overshoot in power tools wherein torque per angle rate is sensed on each rundown and the speed of the tool is automatically adjusted to maintain torque accuracy on higher torque rate joints while maintaining speed on lower torque rate joints, automatically minimizing tool heating and maximizing job rate. In the setting of threaded fasteners, joint rates are defined as high (hard), medium or low (soft). Two torque points are defined, a first torque point and a second torque point, which are percentages of the target torque, for example 25% and 50% respectively. Two angle values are defined corresponding to the number of degrees of tool spindle rotation measured along the portion of the torque/angle curve between the first torque point and the second torque point on typical linear hard and medium joints.
    Type: Grant
    Filed: October 25, 1993
    Date of Patent: June 10, 1997
    Assignee: The Stanley Works
    Inventors: Stephen M. Kainec, William L. Naumann