PURPOSE: To enable easy and sure coupling with good workability by providing a recess part and a projection part on a second panel member which are engaged with an engaging projection part and a recess part at the tip ends of an upper and a lower extended walls of an edge part on the coupling side of a first panel member and by folding and fixing a folding projection part of the first panel member onto the recess part of the second panel member after engagement.
CONSTITUTION: An upper and a lower extended walls 3 and 4 are provided at an edge part on the coupling side of a first panel member 1, and an engagement projection part 5 and an engagement recess part 7 are formed at the tip ends of each of them. In the meantime, at the upper and lower parts of the opposite edge part of a second panel member 2, an engagement recess part 16 and an engagement projection part 17 which are engaged with the engagement projection part 5 and the engagement recess part of the first panel member 1 are formed. Moreover, a projection part 8 for folding is formed from the lower extended wall 4 of the first panel member so as to form an engagement projecting streak having a lock surface 19b to be engaged and locked with the tip end when the projection part 8 is folded onto the second panel member and to restrain movement in the engagement releasing direction. Thus, easy and sure combining and coupling can be carried out with good workability.
OKUBO KUNIO
SUDO MASAMI
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