| 摘要 |
PROBLEM TO BE SOLVED: To propose a joining structure of a footboard capable of securing high reliability when using a slope.SOLUTION: A forward extending projection piece part 12 is provided on one end surface of a footboard 11, and a fitting hole 13 capable of fitting the projection piece part 12 is provided on the other end surface, respectively, and a pair of the footboards 11 are joined to each other in a substantially plate shape in an extended state by fitting the projection piece part 12 of one adjacent footboard 11 to the fitting hole 13 of the other footboard 11. According to such a joining structure, force acting vertically to a joining part is supported by shearing rigidity of the projection piece part 12 and the fitting hole 13, and rotational force for acting in the direction for bending the joining parr downward, is also supported by pressure contact force generated between a base end part upper surface of the projection piece part 12 and a tip part upper surface of the fitting hole 13 and pressure contact force generated between a tip part under surface of the projection piece part 12 and a base end part under surface of the fitting hole 13, and the joining part holds high strength performance. |
