Metal deforming – By use of tool acting during relative rotation between tool... – Tool orbiting or rotating about an axis
Reexamination Certificate
2007-01-16
2007-01-16
Tolan, Ed (Department: 3725)
Metal deforming
By use of tool acting during relative rotation between tool...
Tool orbiting or rotating about an axis
C072S020500, C072S125000
Reexamination Certificate
active
10201455
ABSTRACT:
A method for producing a bung for a metal cask that does not require a conventional collar and seal, and that simplifies the operations for forming the bung. The method disclosed in the present application includes the following steps. First, a prestamping operation creates a preforming dome in the wall of the cask such that a cuvett is formed. Second, an approximately cylindrical shaft is formed by stamping and thus puncturing the wall of the cask at the location of the bung. Third, the protruding edge of the shaft is folded down the to form an external rolled edge. Fourth, encircling the shaft with a rigid ring constituted by at least two annular sections such that the metal does not tear during the formation of the threads. Finally, the method of the present invention includes the step of implementing a roller threading head to form internal threads in the shaft.
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patent: WO 01/53021 (2001-07-01), None
patent: BIF114145/WO (2002-03-01), None
Brun Lucien
Carayon Jean-Claude
Gallay S.A.
Tolan Ed
VanOphem & VanOphem P.C.
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