Method and apparatus for changing the inclination or orientation of a longitudinal tab of an extruded weather strip for motor vehicles during its extrusion and weather strip thus obtained

Claim 1

Extrusion head for extruding weather strips (1) of elastomeric material, particularly for motor vehicles, comprising an anchoring section (2) and a longitudinal sealing section (3) in the form of a tab coextruded with the anchoring section, the extrusion head (10) comprising a die (11) with an extrusion orifice (12) having a shape corresponding to the cross-section of the weather strip (1) to be extruded, characterised in that it includes a deflector device (18) adapted, when actuated, to change the inclination or orientation of the sealing section (3) relative to the anchoring section (2) during extrusion.

Claim 5

A method for extruding weather strip (1) of elastomeric material, particularly for motor vehicles, of the kind comprising an anchoring section (2) and a longitudinal sealing section (3) in the form of a tab coextruded with the anchoring section (2), by means of an extrusion head (10) comprising a die (11) with an extrusion orifice (12) having a shape corresponding to the cross-section of the weather strip (1) to be extruded, characterised in that it comprises providing a deflector device (18) having a deflection surface (18c) with an initial profile (18d) corresponding substantially to the profile of one face of the tab (3) of the weather strip (1) at the outlet from the extrusion die (11), and connected, with continuous. variation, to a final profile (18e) having a predetermined orientation or inclination different from that of the initial profile (18d), and moving, during the extrusion, the deflector device (18) relative to the extrusion orifice (12) between a rest position in which the deflection surface (18c) does not interfere with the weather strip (1) leaving the extrusion die (11), and a working position in which the deflection surface (18c) is located adjacent the extrusion orifice (12) with the initial and final profiles (18d; 18e) along the direction of output of the weather strip (1) whereby the tab (3) leaving the extrusion die (11) slides in contact with the deflection surface (18c) and is plas- stically deformed to gradually assume the final profile (18e) of the deflection surface (18c).

Claim 6

A method for extruding weather strip (1) of elastomeric material, particularly for motor vehicles, of the kind comprising an anchoring section (2) and a longitudinal sealing section (3) in the form of a tab coextruded with the anchoring section (2), by means of an extrusion head (10) comprising a die (11) with an extrusion orifice (12) having a shape corresponding to the cross-section of the weather strip (1) to be extruded, characterised in that it comprises providing a deflector device (18) having a deflection surface (18c) with an initial profile (18d) corresponding substantially to the profile of one face of the tab (3) of the weather strip (1) at the outlet from the extrusion die (11), and connected, with continuous. variation, to a final profile (18e) having a predetermined orientation or inclination different from that of the initial profile (18d), and moving, during the extrusion, the deflector device (18) relative to the extrusion orifice (12) between a rest position in which the deflection surface (18c) does not interfere with the weather strip (1) leaving the extrusion die (11), and a working position in which the deflection surface (18c) is located adjacent the extrusion orifice (12) with the initial and final profiles (18d; 18e) along the direction of output of the weather strip (1) whereby the tab (3) leaving the extrusion die (11) slides in contact with the deflection surface (18c) and is plas- stically deformed to gradually assume the final profile (18e) of the deflection surface (18c).