Patents Assigned to Riesselmann & Sohn
  • Method of producing a molded connection piece and method for joining tube with molded connection piece
    Patent number: 5104468
    Abstract: There is provided a molded connection piece and a method of making the same, in particular a boring saddle made of thermoplastic material and having a heating wire capable of conducting an electric current for producing a welded joint between the molded connection piece and an object to be joined with the molded connection piece. The heating wire is embedded in both surfaces of a disk-shaped core, in each case following the course of a spiral-shaped groove, and the core having the heating wire is joined with the molded connection piece. The disk-shaped core is formed of a material which, on melting, combines itself with the material of the molded connection piece.
    Type: Grant
    Filed: May 11, 1990
    Date of Patent: April 14, 1992
    Assignee: Riesselmann & Sohn
    Inventor: Arie de Jong
  • Method of producing a molded connection piece, in particular a boring saddle
    Patent number: 4933037
    Abstract: There is provided a molded connection piece and a method of making the same, in particular a boring saddle made of thermoplastic material and having a heating wire capable of conducting an electric current for producing a welded joint between the molded connection piece and an object to be joined with the molded connection piece. The heating wire is embedded in both surfaces of a disk-shaped core, in each case following the course of a spiral-shaped groove, and the core having the heating wire is joined with the molded connection piece. The disk-shaped core is formed of a material which, on melting, combines itself with the material of the molded connection piece.
    Type: Grant
    Filed: October 13, 1988
    Date of Patent: June 12, 1990
    Assignee: Riesselmann & Sohn
    Inventor: Arie de Jong