Patent ID: 9144947
Filing Date: 2015-09-29
Classification: B29D

Abstract:
1. A rigid core for forming a tire, which is a rigid core comprising an annular core main body provided in its outer surface with a tire molding surface portion for forming a green tire, and vulcanizing and molding the green tire between the core main body and a vulcanizing mold by being put into the vulcanizing mold together with the green tire, and which is characterized in that the core main body is composed of a plurality of core segments divided in a circumferential direction, the core segments comprise first core segments having a small circumferential width and having both circumferential end surfaces as first butting surfaces, and second core segments arranged alternately with the first core segments, having a large circumferential width and having both circumferential end surfaces as second butting surfaces, the core main body is formed into an annular shape by butting the circumferentially adjacent first and second butting surfaces against each other, and the first butting surface comprises an outwardly inclined surface portion inclined so that the circumferential width increases toward the inside in a radial direction, and a parallel surface portion connected to the radially outside of the outwardly inclined surface portion via a borderline and being parallel with a center plane in the circumferential width, of the first core segment.