Patents by Inventor Leif Hjert

Leif Hjert 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 transport or displacement of elongated objects in particular, as well as a pulling or traction wheel comprised in said device
    Patent number: 4603839
    Abstract: An apparatus for transporting or displacing elongated objects in a direction longitudinal to the object comprises a rotatable traction wheel including a first and a second disc. A plurality of arcuately shaped ridges are defined on opposing surfaces of the discs. The ridges extend substantially axially from the center of the discs to the circumferences of the discs. The first and second discs are journalled to a rotatable shaft. The axial and angular positions of one or both of the discs with respect to the shaft may be adjustable. The shaft may include an articulated joint to permit the angle of rotation of the first disc to be displaced from the angle of rotation of the second disc.
    Type: Grant
    Filed: May 27, 1983
    Date of Patent: August 5, 1986
    Assignee: Igelfors Bruks AB
    Inventors: Uno Ekman, Leif Hjert