Patents Assigned to Motrac AB
  • Two arms system
    Patent number: 6193087
    Abstract: Unit cranes consist of three jointed arms (13-15), the middle arm (14) being in the form of a polygon comprising a number of units jointed together, the mobility of the units being arranged by influencing the units internally. The object of the invention is to achieve improved traction curves and speed curves, and this is effected by influencing the movement of the units from the outside by means of a hydraulic mechanism.
    Type: Grant
    Filed: May 5, 1999
    Date of Patent: February 27, 2001
    Assignee: Motrac AB
    Inventors: Wiking Gunnarsson, Karl Gustav Lindqvist