Patent ID: 9683374
Date: 2017-06-20
CPC Classifications: E04B,E04F,H02G

Claim:
1. A floor panel comprising an upper member and a lower member which are formed as opened box shape having a concave space, wherein the peripheral edge portions are connected so as to communicate the concave spaces in said upper member and said lower member with each other, and an internal space is formed in the inner portion thereof, wherein a notched portion intruding approximately as a rectangular shape with two inner corners which extend into an inner side of said floor panel is formed in a peripheral edge and side plate portion of each of said upper member and said lower member, wherein a step receiving surface having a step in relation to the upper surface of the floor panel is formed in said upper member so as to be along three edge portions of said notched portion, wherein the two internal corner portions of said rectangular notched portion formed in the upper member intrude into the inner side of said floor panel, in a horizontal cross section below the step receiving surface, and wherein the two internal corner portions of said rectangular notched portion formed in the lower member intrude into the inner side of said floor panel, in a horizontal cross section above a bottom surface of the floor panel.