Patents Assigned to LIFTRA APS
  • Patent number: 8998546
    Abstract: A fixture for attachment of an end of a member, such as a wind turbine tower section, blade or hub for a wind turbine characteristically has an end flange. To enable clamping while being able to compensate for different hole patterns in the flanges, by the invention, the fixture provides for retaining of ends of members with flanges, regardless of flange diameter and hole patterns, and which is also quickly and easily installed. Additionally, it is possible to firmly clamp the flange end to upstanding frame parts of the fixture with fastening elements, thereby providing a stable connection between a console of the fixture and the upstanding frame parts.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: April 7, 2015
    Assignee: Liftra ApS
    Inventor: Per E Fenger
  • Patent number: 8636488
    Abstract: A hydraulic motor or pump (2) that generates a relatively high torque, and further allows an unprecedented high specific displacement that makes the motor suitable yaw motor for large wind turbines of horizontal axis wind turbines or wheel yaw motor on Heavy Carriers. The characteristic by the hydraulic motor or pump (2) is that if the number of barriers in the annular cavity (12) of engine or pump is n then the number of radial displaceable sliders (20) will be larger than (n+1).
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: January 28, 2014
    Assignee: Liftra ApS
    Inventor: Per E. Fenger
  • Publication number: 20120217089
    Abstract: A device for establishing admittance and transport of cargo to and from a wind turbine construction above ground level and having a part which can be raised and/or lowered by wires and winches located at ground level and connected with snatch blocks attached to a part so that it can be raised and/or lowered in relation to the construction. The part has a number of travelling crabs according to the numbers of winches and the travelling crabs are guided of the wires between the winches and the snatch blocks, and that the part with the travelling crabs is displaced upwards or downwards by the wires. Advantageously, the wires are used for both hoisting the part and as guide for the travelling crabs.
    Type: Application
    Filed: October 28, 2010
    Publication date: August 30, 2012
    Applicant: LIFTRA APS
    Inventor: Per E Fenger
  • Publication number: 20110311388
    Abstract: A hydraulic motor or pump (2) that generates a relatively high torque, and further allows an unprecedented high specific displacement that makes the motor suitable yaw motor for large wind turbines of horizontal axis wind turbines or wheel yaw motor on Heavy Carriers. The characteristic by the hydraulic motor or pump (2) is that if the number of barriers in the annular cavity (12) of engine or pump is n then the number of radial displaceable sliders (20) will be larger than (n+1).
    Type: Application
    Filed: February 17, 2010
    Publication date: December 22, 2011
    Applicant: LIFTRA APS
    Inventor: Per E. Fenger
  • Publication number: 20110194896
    Abstract: Fixture for attachment of an end of a member, such as a wind turbine tower section, blade or hub for a wind turbine, which characteristically has an end flange. To enable clamping while being able to compensate for different hole patterns in the flanges, by the invention, the fixture provides for retaining of ends of members with flanges, regardless of flange diameter and hole patterns, and which is also quickly and easily installed. Additionally, it is possible to firmly clamp the flange end to upstanding frame parts of the fixture with fastening elements, thereby providing a stable connection between a console of the fixture and the upstanding frame parts.
    Type: Application
    Filed: July 23, 2009
    Publication date: August 11, 2011
    Applicant: LIFTRA APS
    Inventor: Per E. Fenger