| 摘要 |
PURPOSE: To obtain flask-like sipes, each of which has curved or bent portion on the tread of a tire without posing problems such as an increase in cost, lowering of quality and the like by a method wherein each metal blade is formed by welding a cylindrical pin to the end part of a thin metal plate, the planted portion of which is curved or bent along a molding surface and the end part of which is straight. CONSTITUTION: Each metal blade 1 is positioned between two groove-forming skeletons adjacent to each other on a molding surface 12 so as to form a flask- like sipe on the tread of a tire. The metal blade 1 consists of thin metal plate 2 and pin 3, which is welded to the end part 2a of the thin metal plate 2 under the state being fitted in a groove formed in it self. The portion, in which the thin metal plate is planted, is curved or bent along a molding surface 12, while the end part 2a of the thin metal plate is substantially straight. In the pin 3, a groove 4 having the breadth slightly wider than the thickness of the thin metal plate 2 is worked along and parallel to its axis line. Both the ends of the groove reach-to both the ends of the pin 3. Thus, the welding work between the pin 3 and the thin metal plate 2 becomes easy. |
