Patent ID: 6769722
Filing Date: 2004-08-03
Classification: B21D,F16L

Abstract:
A device for providing a pressure sealed coupling of tube ends of two tubes, comprising:a cylinder-shaped coupling sleeve having a sleeve interior surface defining a substantially cylindrical interior space, said sleeve interior surface being equipped with teeth means for receiving each of the tube ends, said teeth means being radially displaceable into surfaces of said tube ends received by the interior space by pressure acting on an outer surface of said coupling sleeve; said sleeve interior surface defining at least two radially surrounding indentations spaced from one another and recessed with respect to an inner diameter of said coupling sleeve and having said teeth means disposed therein for engaging respective ends of said two tubes; said outer surface of said coupling sleeve defining radially surrounding locating features which have a width corresponding to a width of said indentations and are opposite said respective indentations; pressure rings concentrically slidable over said coupling sleeve for covering said coupling sleeve, said pressure rings each having an inner surface having radially surrounding projecting parts aligned with said locating features and an increasing cone-shaped enlargement of an outer surface thereof which is directed from each end of the pressure rings towards a center thereof; and press rings concentrically enclosing each of said pressure rings on each side, said press rings each having a cone-shaped enlargement corresponding to said cone-shaped enlargement of said pressure rings such that during axial shifting of said press rings toward each other from a spaced initial position into an almost final position with said press rings at least almost in mutual contact, a radial displacement of said indentations occurs pressing said teeth means into said outer surfaces of said tube ends received by said coupling sleeve by means of said projecting parts and said locating features corresponding to said projecting parts.