| 摘要 |
PURPOSE:To make it possible to desirably project and retract spike pins, by providing a plurality of cylindrical members having the spike pins in a lateral direction of an outer periphery of a tire, and slidably inserting plate-like members having convex and concave portions in the cylindrical members, wherein the pins are projected and retracted by sliding the plate-like members. CONSTITUTION:Grooves 3 are formed in a lateral direction of an outer periphery of a tire 2, and cylindrical members 1 are embedded in the grooves 3. The cylindrical members 1 are fixed through connecting wires 5 and 6 and wire rings 8 and 9 to the tire 2, and discs 7 are stretched to an axis of the tire. L-shaped bars 12 are slidably inserted into the cylindrical members 1, and spike pins 13 are held on horizontal portions A of the L-shaped bars 12. With this structure, vertical portions D of the L-shaped bars 12 are moved with intermediate plates 17 by rotating adjust bolts 19 provided on a side surface of the tire 2. Accordingly, the horizontal portions A are laterally slid in the cylindrical members 1, and the spike pins 13 are abutted against convex portions B or concave portions C, whereby they are projected and retracted from a surface of the tire. Thus, the spike pins may be desirably projected and retracted from the surface of the tire. |
