Method of manufacturing automobile windshield molding

Abstract

A method of manufacturing a windshield molding by the extrusion process. The molding includes a pair of extruded side molding parts and an extruded upper molding part integral with and extending between the side molding parts. The side molding parts have large thickness portions where water drain channels are formed. The water drain channels have sufficient capacity to guide fluid such as rain water from the outer surface of the windshield.

What is claimed is: 
     
       1. A method of producing a strip of an automobile windshield molding for sealing a space between a windshield and a window opening of a vehicle body using a molding machine, the molding machine including a first die having an opening corresponding to a cross-sectional shape of a molding, a .[.sectorial.]. second die having an arcuate side corresponding to .[.the.]. .Iadd.a .Iaddend.cross-sectional shape of part of the molding and being .[.turned.]. .Iadd.turnable .Iaddend.to cover part of the opening of the first die to change the area of the opening, and a third die rectilinearly movable into and from the opening of the first die, said method comprising: (a) extruding molding material through the opening formed by the first and second dies to form .[.a pair of side molding parts, a pair of corner molding parts and an upper molding part.]. .Iadd.parts .Iaddend.of the molding.Iadd., said parts including a first molding part and other molding parts.Iaddend.;   (b) changing the shape of the opening by moving the dies according to .[.the.]. cross-sectional shapes of the .[.side, corner and upper.]. molding parts to be made;   (c) turning the second die in a direction so as to widen part of the opening of the first die and so as to increase a thickness of the molding material .[.in the sector shape at a portion.]. .Iadd.and create a large thickness portion of the molding material .Iaddend.corresponding to the cross-sectional shape of .[.the side.]. .Iadd.the first .Iaddend.molding part;   (d) advancing the third die into the widened part of the opening with .[.the.]. .Iadd.a .Iaddend.specified timing so as to form a water drain channel on the large thickness portion of the .[.side.]. .Iadd.first .Iaddend.molding part; and   (e) performing at least one of turning the second die and shifting the third die for reducing part of the opening so as to decrease .[.the.]. .Iadd.a .Iaddend.thickness of the .[.widened part of the.]. molding material and for making .[.each of the corner and upper.]. .Iadd.the other .Iaddend.molding parts.   
     
     
       2. A method according to claim 1, wherein the .[.sectoral.]. second die has an arcuate edge corresponding to .[.the.]. .Iadd.a .Iaddend.cross sectional shape of part of the molding.[., and which comprises turning the second die in the direction to widen part of the opening of the first die so as to form a side molding part having a large thickness and width portion.].. .Iadd. 
     
     
       3.  A method according to claim 1, wherein the first die has an arcuate edge in a side of the opening in accordance with an arcuate orbit of the second die. .Iaddend..Iadd.4. A method according to claim 1, wherein the opening of the first die includes a part for extruding a leg. .Iaddend..Iadd.5. A method of producing a strip of an automobile windshield molding for sealing a space between a windshield and a window opening of a vehicle body using a molding machine, the molding machine including a first die having an opening including an arcuate side corresponding to a cross-sectional shape of a molding, a second die having a side corresponding to the cross-sectional shape of part of the molding and being turnable to cover part of the opening of the first die to change the area of the opening, and a third die rectilinearly movable into and from the opening of the first die, said method comprising: (a) extruding molding material through the opening formed by first and second dies to form parts of the molding, said parts including a first molding part and other molding parts;   (b) changing the shape of the opening by moving at least one of the second and third dies according to cross-sectional shapes of molding parts to be made;   (c) turning the second die in a direction so as to widen part of the opening of the first die and form a large thickness portion of the molding material corresponding to the cross-sectional shape of the first molding part;   (d) advancing the third die into the widened part of the opening with a specified timing so as to form a water drain channel on the large thickness portion; and   (e) performing at least one of turning the second die and shifting the third die for reducing part of the opening so as to decrease the thickness of the large thickness portion of the molding material when making the other molding parts. .Iaddend..Iadd.6. A method according to claim 4, wherein the first die has an arcuate side corresponding to a cross sectional shape of part of the molding. .Iaddend..Iadd.7. A method according to claim 4, wherein the first die has an arcuate edge in a side of the opening in accordance with an arcuate orbit of the second die. .Iaddend..Iadd.8. A method according to claim 5, wherein the side of the second die includes a part for extruding a leg. .Iaddend..Iadd.9. A method according to claim 1, wherein the first molding part corresponds to a side molding part installed at a side periphery of a windshield, and the other molding parts correspond to a corner and an upper molding part installed at a corner and an upper periphery of the windshield. .Iaddend..Iadd.10. A method of producing a strip of an automobile windshield molding for sealing a space between a periphery of a windshield and a window opening of a vehicle body panel using a molding machine, the molding machine including a plurality of dies including a rotatable die, comprising the steps of:   (a) extruding molding material as a plurality of molding parts having different cross-sectional shapes;   (b) extruding a large thickness portion as one of said plural molding parts while increasing a thickness of the large thickness portion along a longitudinal direction of the molding by rotating the rotatable die;   (c) forming a wall shaped as an arcuate surface when the large thickness portion is being extruded; and   (d) forming a water drain channel on the well of the large thickness portion of the molding. .Iaddend..Iadd.11. A method of producing a strip of an automobile windshield molding for sealing a space between a periphery of a windshield and a window opening of a vehicle body panel using a molding machine the molding machine including a plurality of dies defining an extrusion opening having a cross-sectional area which is changed by moving at least one of said dies, the dies including a rotatable die and another rectilinearly movable die, said method comprising the steps of:   (a) extruding molding material through said opening as a plurality of molding parts while changing cross-sectional shapes of said plurality of molding parts by changing the area of said opening;   (b) extruding a large thickness portion as one of said plural molding parts while increasing a thickness of the large thickness portion along a longitudinal direction of the molding by rotating the rotatable die to widen the area of said opening;   (c) forming a wall shaped as a circular surface when the large thickness portion is being extruded; and   (d) forming a water drain channel on the wall of the large thickness portion of the molding by advancing the another movable die into the widened area of said opening. .Iaddend..Iadd.12. A method of producing a strip of an automobile windshield molding according to claim 10 or 11, wherein the step of extruding molding material as plural molding parts includes a step of extruding a side molding part corresponding to a side periphery of a windshield, a corner molding part corresponding to a corner periphery of the windshield, and an upper molding part corresponding to an upper periphery of the windshield. .Iaddend.