Patent ID: 7162904
Filing Date: 2007-01-16
Classification: B21D,B23G

Abstract:
1. A method for creating a bung for a cask, said method comprising the steps of: puncturing a surface of said cask at a predetermined location of said bung; forming a single thickness layer shaft at said predetermined location of said bung, said single thickness shaft extending in a substantially traverse direction away from said surface of said cask, said single thickness layer shaft further terminating with a protruding edge; folding said protruding edge of said single thickness layer shaft to form an external rolled edge at said protruding edge; forming a plurality of threads on an internal portion of said single thickness layer shaft, said plurality of threads being formed after said formation of said external rolled edge, said forming step further comprising implementing a roller threading head to form said plurality of threads in said internal portion of said single thickness layer shaft, whereby said plurality of threads are formed without removing any material; reinforcing an external portion of said single thickness layer shaft during formation of said plurality of threads, said reinforcing step further comprising placing a rigid ring having at least two annular sections below said external rolled edge and adjacent said single thickness layer shaft, said two annular sections each having an inner cylindrical surface adapted to reinforce said external portion of said single thickness layer shaft.