Patents Assigned to Hainke Volker
  • Anchor bolt
    Patent number: 4408937
    Abstract: An anchor bolt comprising a tension rod with a male screw-threaded section and a frusto-conical head terminating in a cylindrical shank, in combination with a sleeve having a female screw-threaded section and an internal frusto-conical bore. The sleeve has a polygonal cross-section with axially parallel pre-weakened rupture lines, permitting the sleeve to spread as it is entered by the tension rod, forcing the corners of the polygon into the surrounding material.
    Type: Grant
    Filed: January 29, 1982
    Date of Patent: October 11, 1983
    Assignee: Hainke Volker
    Inventors: Volker Hainke, Hans U. Hainke