| 摘要 |
Cylinders, whose front ends are opened and inner mid section has a retaining section, are fitted in a multiple holes bored on an outer circumferential face of a tire. In each cylinder, a stud is inserted through a through-hole of the retaining section, the stud has an enlarged section, whose maximum diameter section contacts the inner face of the cylinder, at the rear end section and an enlarged neck section at the front end. The stud is biased toward the front end of the cylinder by a spring, which is provided between a lid closing the rear end of the cylinder and the enlarged section. On a icy or snowy road, when the stud inclines by tire slip, the enlarged neck section at the front end of the stud catches the opening edge so as to keep projecting status, and the enlarged section bites icy or snowy road to prevent from slipping. While, on a dyr road the stud is pushed in the cylinder against the elasticity of the spring by weight of a car.
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