| 摘要 |
PURPOSE:To pull a spike inside on a road without snow, thereby turning a tyre back to an ordinary one, by fixing a horizontal cam plate which, only when a filament is pulled out to an other side than the ground-touching surface by the amount of predetermined length, pushes the rear end of the spike so that a portion of the spike protrude from the ground-touching surface. CONSTITUTION:Connecting holes 3 that are connected to a lateral through hole 2 are made on a ground-touching surface 1 in the form of multistage, while a hard guide pipe 4 for a spike 5 is fixed in the connection hole 3. The spike 5 is fitted into the pipe 4 with the tip portion of the spike 5 protruded from the connecting hole 3, while presence of a coil spring 6 gives the pipe 4 the stability which tends to pull the spike 5 inside all the time. A filament 9 gets through the lateral through hole 2. At a position of the filament 9, which corresponds to the connecting hole 3, a horizontal cam plate 15 is fixed, which operates in such a manner that the cam plate 15 pushes the rear end of the spike 5 in order to make the tip portion of the spike 5 protrude from the conncting hole 3 only when the predetermined length of the filament 9 is pulled out by operating an accessory member 11. |
