| 摘要 |
PURPOSE:To reduce the effect of a rubber flowing to a lug cavity and to prevent unconformity of inner shape of a tire by forming a hollow deep enough to secure a skid base gage necessary for a tire after molding and vulcanization in the field of a lug portion forming of a green tire. CONSTITUTION:In each space between the areas where lugs 5 are to be formed a hollow 10 is formed which is deep enough to secure a skid base gage on a case member 4. And, if molding and vulcanization is performed upon determination of the position of each hollow 10 in the middle of lug cavities mutually adjacent to others of vulcanization molds, a concave seldom occurs on the inner surface of the case member 4 which corresponds to the lug 5, and, therefore, the gage t'' of a skid base 6 at the root of the lug 5 remains almost same as the anticipated thickness (t) in the middle of lugs. |
