Patents by Inventor Christa Maria Karlberg

Christa Maria Karlberg has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for quality checking a screw joint tightening process performed by a torque impulse wrench
    Patent number: 7958611
    Abstract: A number of pre-production calibration tightenings are performed at a screw joint identical to a screw joint used in production and using the same impulse wrench as to be used in production tightening. The value of one or more tightening related parameters are registered at the attainment of the desired pre-tension level, and those parameter values are used to statistically form a basis for a reference set-up. The tightening parameter values registered during production tightening are compared to the reference set-up, and an indication is obtained as to discrepancies between the reference set-up and the actually registered parameter values to get an indication as to whether the impulse wrench is malfunctioning and/or the screw joint is faulty.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: June 14, 2011
    Assignee: Atlas Copco Tools AB
    Inventors: John Robert Christian Friberg, Mats Cornelius Holmin, Knut Christian Schoeps, Torbjörn Rafael Sjöblom, Nils Gustav Erland Karlberg, Christa Maria Karlberg, legal representative
  • Method For Quality Checking A Screw Joint Tighening Process Performed By A Torque Impulse Wrench
    Publication number: 20080178450
    Abstract: A number of pre-production calibration tightenings are performed at a screw joint identical to a screw joint used in production and using the same impulse wrench as to be used in production tightening. The value of one or more tightening related parameters are registered at the attainment of the desired pre-tension level, and those parameter values are used to statistically form a basis for a reference set-up. The tightening parameter values registered during production tightening are compared to the reference set-up, and an indication is obtained as to discrepancies between the reference set-up and the actually registered parameter values to get an indication as to whether the impulse wrench is malfunctioning and/or the screw joint is faulty.
    Type: Application
    Filed: September 16, 2005
    Publication date: July 31, 2008
    Inventors: John Robert Christian Friberg, Mats Cornelius Holmin, Knut Christian Schoeps, Torbjorn Rafael Sjoblom, Nils Gustav Erland Karlberg, Christa Maria Karlberg