Play-free and centering tube coupling for the spindle of a textile machine

A play-free and centering tube coupling for nonpositively connecting a tube receptacle to a spindle shank of a textile machine, said tube coupling comprising:

• a body;
• a thrust piece arranged axially moveably within said body, said thrust piece having at least one face;
• an end piece fixedly connected to said body, said end piece having at least one face;
• at least three driving elements being arranged centrically and adapted to bear against an inner wall of the tube receptacle, wherein said driving elements are arranged so as to be movable predominantly radially between said body and said thrust piece;
• a guide slope in the form of a conical collar arranged on said thrust piece being arranged to contact said at least three driving elements;
• and
• detaining centrifugal elements being positioned between said thrust piece and said end piece and being displaceable predominantly in a radial direction,
• wherein at least one of said at least one faces of said thrust piece and of said end piece is arranged as an additional guide slope positioned to contact said detaining centrifugal elements.