Method of forming a clamping ring and a clamping ring

Abstract

A pipe from a plastic material having memory properties is extruded. The extruded pipe is cut to form a pipe part ( 7 ). The pipe part ( 7 ) is warmed and the end ( 6 b ) of the pipe part ( 7 ) is bent. The pipe part ( 7 ) forms a clamping ring ( 6 ) and the bent end ( 6 b ) of the pipe part ( 7 ) forms a stop edge ( 10 ) in the clamping ring ( 6 ).

1 . Method of forming a clamping ring, the method comprising:
 extruding a pipe from a plastic material having memory properties, cutting the extruded pipe to form a pipe part,   warming the pipe part and   bending the end of the pipe part such that a clamping ring having a stop edge is formed.   
     
     
         2 . A clamping ring that is formed from an extruded pipe by cutting the pipe into a short enough pipe part, wherein
 the end of the pipe part is bent such that the end of the pipe part forms a stop edge in the clamping ring.   
     
     
         3 . A method for forming a clamping ring, the method comprising:
 extruding a pipe having a smooth cylindrical inner surface and an inner circumference from a plastic material having memory properties;   cutting the extruded pipe to form a pipe part having a first open end and a second open end;   warming said pipe part; and   creating a stop edge within said surface of said pipe part by bending one of said ends wherein said stop edge has an inner circumference smaller than said inner circumference of said pipe.   
     
     
         4 . A method according to  claim 3 , wherein the bending of the end of the pipe part is performed by widening the body part of the pipe part and by preventing the end of the pipe part from widening. 
     
     
         5 . A method according to  claim 3 , wherein
 the widening of the body part of the pipe part is made by means of a collapsible cylinder positioned in the pipe part, the length of the cylinder being shorter than the length of the pipe part.   
     
     
         6 . A method according to  claim 3 , further comprising
 positioning an outer mold on the pipe part before widening the body part of the pipe part.