Patents Assigned to Ciandar
  • Method for monitoring and controlling stress in a threaded member
    Patent number: 5571971
    Abstract: The tensile or compressive stress in a threaded member is determined by subtracting an unscrewing torque from a screwing torque, and dividing the resulting torque difference by a coefficient proportional to the screw pitch of the member. The torque values are recorded either statically at the screwing and unscrewing rest limit, or dynamically in a series of corresponding screwing and unscrewing positions. The method is particularly useful for measuring, monitoring and controlling stress in threaded fastening members used in screwed joints.
    Type: Grant
    Filed: June 15, 1995
    Date of Patent: November 5, 1996
    Assignee: Ciandar
    Inventors: Jean-Marc Chastel, Didier Rey