Patents by Inventor Rolf Bergstrom

Rolf Bergstrom 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).

  • Patent number: 4209978
    Abstract: A method and a device for bending a rod-shaped link blank into a substantially closed chain link, particularly while at the same time hooking the link blank into a chain end. According to the invention, the blank is brought into a first receiving position with one of its end portions located between, on the one hand, two rotatable abutment rollers disposed at a distance from each other and, on the other hand, a bending tool movable back and forth transversely between said abutment rollers. The bending tool is then brought to a position between the two rollers so as to bend said one end portion of the link blank.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: July 1, 1980
    Assignee: Bulten-Kanthal AB
    Inventors: Sigge Johansson, Rolf Bergstrom
  • Patent number: 4185454
    Abstract: A device for inserting a link stud into a chain link to permit subsequent fastening of the link stud in the chain link in the region of the stud and/or by welding same. According to the invention, a pivotably mounted arm is arranged in operative connection to a stud fastening station, the arm carrying at its free end an operable holding means for holding said link stud and being pivotable back and forth between a collecting position adjacent a link stud feeding device and a delivery position adjacent the stud fastening station, and the holding means is resiliently mounted at the free end of the arm so as to enable guiding of the holding means into a well-defined position relative to a chain link situated in the stud fastening station.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: January 29, 1980
    Assignee: Bulten-Kanthal AB
    Inventors: Rolf Bergstrom, Stig Svensson
  • Patent number: 4158288
    Abstract: A method and a device for revolving the last chain link element of a freely hanging chain end. The chain link element is brought into contact with at least one rotating roller located under the chain end, said roller carrying the chain link element while making it rotate in its plane.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: June 19, 1979
    Assignee: Bulten-Kanthal AB
    Inventor: Rolf Bergstrom
  • Patent number: D297877
    Type: Grant
    Filed: August 27, 1985
    Date of Patent: September 27, 1988
    Assignee: Gunnebo AB
    Inventor: Rolf Bergstrom
  • Patent number: D297878
    Type: Grant
    Filed: August 27, 1985
    Date of Patent: September 27, 1988
    Assignee: Gunnebo AB
    Inventor: Rolf Bergstrom