| 摘要 |
PURPOSE:To prevent a noise, damage to road surface and car dust pollution by providing a window part communicating the interior and the exterior on the peripheral side of a tubular-shaped shank or a tip, levee-like projection parts interposing the window part between them and partition walls parallel to a central shaft in the interior and forming the pointed head like a spherical surface. CONSTITUTION:Ice and snow, water, grains of sand and car dust are pressed into a tip 3, shank 1 and the like through a gap between partition walls 7, 7' etc. during travling and braking. Then, they are discharged through a window part 5 due to a shock given through movement of a partial layer of rubber of a typre carcass into a cylindrical part 6 of a flange and a hollow of the shank 1 and also a flexible friction of the layer of rubber against the outside of a projecting part 4 of the shank 1. Thus, since an edge of the exposed exterior end 8 of the tip 3 is always maintained sharp so that brakeage can be secured and also the pointed end is curved so that the road surface is not damged, a noise and car dust pollution may be prevented. |
