Apparatus for extruding composite black and white rubber strips for white sidewall tires

Claim 1

APPARATUS FOR EXTRUDING A COMPOSITE WHITE AND BLACK RUBBER STRIP FOR A WHITE SIDEWALL TIRE, SAID APPARATUS COMPRISING A PAIR OF FACE-TO-FACE EXTRUDERS EACH COMPRISING A PASSAGE, MEANS FOR SUPPLYING BLACK RUBBER TO ONE OF SAID PASSAGES FOR SUPPLYING WHITE RUBBER TO THE OTHER OF SAID PASSAGES, AND MEANS FOR FORCING RUBBER THROUGH THE PASSAGES, A HEADER CONNECTED BETWEEN THE ADJACENT ENDS OF AID PASSAGES AND HAVING A SEPARATE PASSAGE COMMUNICATING WITH EACH OF SAID EXTRUDER PASSAGES, A FORMING DIE HAVING A FIRST DIE PASSAGE COMMUNICATING WITH THE ONE OF SAID HEADER PASSAGES WHICH COMMUNICATES WITH THE ONE EXTRUDER PASSAGE, SAID DIE PASSAGE TERMINATING IN A FIRST OPENING HAVING TWO SPACED PORTIONS AND A THIN CONNECTING WEB PORTION, SAID DIE ALSO HAVING A SECOND DIE PASSAGE COMMUNICATING WITH THE ONE OF SAID HEADER PASSAGES WHICH COMMUNICATES WITH THE OTHER EXTRUDER PASSAGE, SAID SECOND DIE PASSAGE TERMINATING IN A SECOND OPENING OF GENERALLY RECTANGULAR CROSS SECTION, SAID SECOND DIE OPENING BEING SUBSTANTIALLY AS WIDE AS SAID WEB PORTION OF SAID FIRST DIE OPENING AND SUBSTANTIALLY AS THICK AS THE TWO SPACED PORTIONS OF SAID FIRST DIE OPENING, BOTTOM PORTIONS OF SAID SPACED PORTIONS OF SAID FIRST DIE OPENING AND THE BOTTOM OF SAID SECOND DIE OPENING LYING ON SUBSTANTIALLY A STRAIGHT LINE, SAID FIRST AND SECOND DIE PASSAGES INTERSECTING AND TERMINATING IN A GIVEN PLANE,