| 摘要 |
PURPOSE:The titled apron not causing frictional deformation and cracking, having a shape wherein one of rubber layers at both of surface and back sides which are bonded through a core cord at the periphery of an apron is made shorter than the other. CONSTITUTION:The step part 20 is formed along the periphery of the back rubber layer 19 in a notch way at the layer. When the core cord 17 is embedded in the peripheral protrusion part 21, deformation will have influence on the protrusion part 21 not much even if the back rubber layer 19 of the apron 3 is expanded in the width direction and no angular expanded part is formed on the surface rubber layer 18. When the periphery of the apron 3 is cut in a notch way slantly and width of one of the rubber layers is made wider than the other, the periphery of the surface rubber layer 18 will not be deformed by the influence of expansion and deformation of the back rubber layer 19.
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