| 摘要 |
PURPOSE:To increase and decrease the slip preventing effect for a tire by arranging a capacity body whose capacity can be varied and a movable tread which makes frequent appearance as the capacity body is swollen and collapsed, into the concaved part of a fixed tread and changing the grounded pattern of the tire. CONSTITUTION:The outside part of a fixed tread 1 is cut, keeping a proper intervals, to form a concaved part 5, and a movable tread 2 fitted into the concaved part is formed. A spike pin 3 is buried into each projection part of the tread 1. A tube 4 as a body whose capacity can be varied is arranged into the concaved part 5 of the tread 1, and the movable tread 2 is fixed outside the tube 4. When a spike pin 3 is not necessary, working fluid is introduced into each tube 4, and the tube 4 in collapsed state is formed into swollen state, and the movable tread 2 formed integrally with the tube 4 contacts with a road surface, and the state where the pin 3 does not contact with the road surface is generated. |
