Patents Assigned to Eisenwerke Friedrich Wilhelm Duker GmbH & Co.
  • Patent number: 4805932
    Abstract: A spigot-and-socket joint which is secured against pulling apart, particularly for socket pipes manufactured by centrifugal casting or molding, wherein the spigot end of one pipe is pushed into the socket end of another pipe, with radial play, comprises a sealing ring and a gripping ring in the socket pipe, the gripping ring comprising a plurality of gripping segments mutually spaced circumferentially and each having a spherically convex radially outer surface and being interconnected in the circumferential direction by a vulcanized intermediate piece of rubber or the like, and a toothed configuration on the radially inner surface, so that when axial tensile forces arise at the joint, the toothed configurations are pressed radially inwardly against the spigot end by interaction of the spherically convex surfaces with an interior conical surface of the pipe socket which interior surface narrows in the direction of the distal end of the socket.
    Type: Grant
    Filed: March 4, 1987
    Date of Patent: February 21, 1989
    Assignee: Eisenwerke Friedrich Wilhelm Duker GmbH & Co.
    Inventors: Erich Imhof, Manfred Vorbeck