Patents by Inventor Roland Fredriksson

Roland Fredriksson 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).

  • Device for tightening, prestressing and untightening a threaded joint
    Patent number: 4062254
    Abstract: A device for tightening, prestressing and untightening a threaded joint has a body for mounting around a nut in the joint. The body is provided with pistons, actuated by pressure medium for providing an elastic elongation of a screw in the joint. Inclined planes are arranged to convert the axial movement of the pistons to a turning movement for turning the nut thereby achieving tightening or untightening of the threaded joint. The angle of the inclined planes are so adjusted that there is a suitable relationship between axial force and torque.
    Type: Grant
    Filed: August 9, 1976
    Date of Patent: December 13, 1977
    Assignee: AB Motala Verkstad
    Inventor: Roland Fredriksson
  • Method of assembling and disassembling a pre-tensioned screwed joint and a device for carrying out the method
    Patent number: 3947948
    Abstract: A pre-tensioned, screwed joint is assembled or disassembled by using a piston and rod arrangement to elastically extend the screw while a nut is applied or removed.
    Type: Grant
    Filed: December 5, 1974
    Date of Patent: April 6, 1976
    Assignee: Aktiebolaget Motala Verkstad
    Inventors: Roland Fredriksson, Ingvar Eklund