| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase an antislipping effect by forming a plural number of protruded parts on a footboard surface of a staircase and forming a protruded pattern formed of these protruded parts so as to change from thin to thick toward the head end side from the deep side of the footboard. SOLUTION: A plural number of protruded parts 16 are formed on a surface 31 of a footboard sheet 30, and a protruded pattern 15 formed of these protruded parts 16 changes from thin to thick toward a head end side 33 from a deep side 32 of the sheet 30 corresponding to a deep side 12 of a footboard 10. Additionally, the protruded parts 16 are made roughly rectangular and arranged in a lattice shape so that an area on the protruded part 16 comes to be smaller for each of steps toward the head end side 13 from the footboard deep side 12, and a groove 17 formed in the longitudinal and lateral directions between the protruded parts 16. Additionally, the groove 17 between these protruded parts 16 extends in a direction where the protruded pattern 15 comes to be thicker from thin and has water inclination by forming it gradually deeper toward the head end side 13 from the footboard deep side 12. Consequently, it is possible to provide an antislipping effect of a footboard surface and an excellent outer appearance with a sense of togetherness in design.</p> |
