Patent ID: 8826714

Claim:
Method for the manufacture of a wall connector piece ( 1 ) comprising the following steps: providing a first tube section ( 2 ) and a second tube section ( 3 ) having a predetermined uniform outer diameter (d) and a wall thickness (w); reducing in a first deformation step the outer diameter (d) at one end ( 7 ) of the second tube section ( 3 ) to form a section of reduced-diameter while increasing the wall thickness (w) in the section of reduced-diameter; deforming in a second deformation step at the one end ( 7 ) of the section of reduced-diameter of the second tube section ( 3 ) to a desired final shape including deforming an outer profile of the section of reduced-diameter of the second tube section ( 3 ) to provide for a hose connecting area ( 4 ) by introducing the section of reduced-diameter of the second tube section ( 3 ) into a bore ( 13 ) of a shaping tool ( 12 ) provided with an internal profile, moving axially into and within the reduced-diameter section of the second tube section ( 3 ) a first plunger ( 15 ) which has an outer diameter that exceeds an inner diameter of the reduced-diameter section of the second tube section ( 3 ) to achieve the outer profile for the hose connecting area ( 4 ) by radially expanding the reduced-diameter section of the second tube section ( 3 ) from the inside thereof, moving into and within the reduced-diameter section of the second tube section ( 3 ) a second plunger ( 16 ) in opposition to the first plunger ( 15 ), the first plunger ( 15 ) having a first front face ( 19 ) and the second plunger ( 16 ) having a second front face ( 20 ), both the first plunger ( 15 ) and the second plunger ( 16 ) coming in contact with each other within the reduced-diameter section of the second tube section ( 3 ), with the first front face ( 19 ) coming in contact with the second front face ( 20 ), the first front face ( 19 ) and the second front face ( 20 ) are then moved together out of the reduced-diameter section of the second tube section ( 3 ) while the first front face ( 19 ) and second front face ( 20 ) remain in contact; and, deforming in a third deformation step at an end ( 5 ) of the first tube section ( 2 ) by rotating the first tube section ( 2 ) about a first axis of rotation and bringing the end ( 5 ) of the first tube section ( 2 ) into contact with a friction element ( 25 ) which comprises a rotatable body ( 26 ), the rotatable body ( 26 ) is driven for rotation about a second axis of rotation which is different from the first axis of rotation and the rotatable body ( 26 ) is driven without penetrating the first tube section ( 2 ) to form an end closure of the end ( 5 ) of the first tube section ( 2 ).