Thereafter, the staircase tread 20 is placed on a stairway stringer board 22, a connecting surface 13 of the bracket 10 is made contact with an upper end surface of the stringer board 22, and a second receiver surface 12 of the bracket 10 is made contact with an upper end back surface of the stringer board 22. 次に、階段踏板20を階段桁板22に載置し、取付金具10の連結面13を桁板22の上端面に当接すると共に取付金具10の第2受け面12を桁板22の上端部裏面に当接する。 - 特許庁