Patent ID: 7454937

Claim:
Expandable and contractible coiler mandrel ( 1 ), especially for coiling a metal strip, which has: a rotatably supported coiler mandrel shaft ( 2 ), which has at least one wedge surface ( 3 ) on its outer circumference; a number of cooperating segments ( 4 ), which have a coiling surface ( 5 ), especially for the metal strip, on their outer circumference, and which have at least one opposing wedge surface ( 7 ) that cooperates with the wedge surface ( 3 ) of the coiler mandrel shaft ( 2 ) in their end region ( 6 ) facing away from the coiling surface ( 5 ); means ( 8 ) for shifting the segments ( 4 ) relative to an axial direction (A) of the coiler mandrel shaft ( 2 ); and a supply system ( 9 ) with which a lubricant, especially lubricating grease, is conveyed to places ( 10 ) in the coiler mandrel ( 1 ) that require lubrication, wherein the supply system ( 9 ) is connected with a lubricant pump ( 11 ), which has an actuating element ( 12 ) for carrying out the pumping operation, such that the lubricant pump ( 11 ) is connected with the means ( 8 ) for shifting the segments ( 4 ) or with the coiler mandrel shaft ( 2 ), and the actuating element ( 12 ) is connected with the other of the coiler mandrel shaft ( 2 ) or the means ( 8 ) for shifting the segments in such a way that the pumping operation is carried out only when the means ( 8 ) for shifting the segments ( 4 ) are actuated.