Corner screed bead

Claim 1

A CORNER SCREED BEAD FOR USE IN FORMING INSIDE AND OUTSIDE PLASTER CORNERS, SAID CORNER SCREED BEAD BEING FORMED OF RESILIENTLY FLEXIBLE PLASTIC MATERIAL AND COMPRISING: (A) A SOLID BEAD OF CIRCULAR CROSS SECTION, (B) FIRSFT AND SECOND ELONGATED FLANGES JOINED BY SAID SOLID BEAD AND EACH HAVING A FREE EDGE, SAID FLANGES EXTENDING RADIALLY FROM SAID SOLID BEAD AT RIGHT ANGLES TO ONE ANOTHER SO THAT THE FLANGES HAVE INSIDE AND OUTSIDE SURFACES, (C) SAID FLANGES HAVING FLAT WEB PORTIONS AND A PLURALITY OF SPACED RIBS PROJECTING ABOVE SAID FLAT WEB PORTIONS ON THE INSIDE AND OUTSIDE SURFACES OF SAID FLANGES, (D) SAID WEB PORTIONS BEING OF A THICKNESS WHICH IS SUBSTANTIALLY LESS THAN THE DIAMETER OF SAID SOLID BEAD SO THAT SAID SOLID BEAD PRESENTS AN EXPOSED CONVEX TIONS HAVING A PLURALITY OF OPENINGS THERETHROUGH TIONS HAVING A PLURALITY OF OPENINGS THERETHROUGH BETWEEN SAID RIBS, (E) SAID RIBS BEING DISPOSED AT ANGLES OF 45* TO SAID SOLID BEAD AND TO SAID FREE EDGES OF SAID FLANGES, THE APEXES OF THE RIBS ON THE OUTSIDE SURFACES OF SAID FLANGES LYING IN PLANES WHICH ARE TANGENT TO SAID SOLID BEAD, AND THE APEXES OF THE RIBS ON THE INSIDE SURFACES OF SAID FLANGES LYING IN PLANES WHICH CONVERGE AT A LINE LYING IN SAID EXPOSED CONVEX SURFACE OF SAID SOLID BEAD BETWEEN SAID FLANGES.