Patent ID: 6865856

Claim:
A plastic flooring comprising: a first flooring having an upper surface, a lower surface, and a first side surface with a concave portion; and a second flooring having a flat upper surface, a lower surface, and a second side surface with a convex portion, said second flooring assembled to the side surface of the first flooring by inserting the convex portion into the concave portion, said concave portion and the convex portion each comprise, slanted surfaces formed on a top surface of the concave portion and the convex portion toward the upper surface of the first and the second floorings and maintaining a certain angle with respect to the upper surface of the first and the second floorings, abutting surfaces formed on a bottom surface of the concave portion and the convex portion toward the lower surface of the first and the second floorings and engaging each other in a close manner; and perpendicular surfaces connecting the slanted surfaces and the abutting surfaces, wherein the abutting surfaces of the concave portion and the convex portion being parallel to the upper surfaces of the first and the second floorings, and both of the slanted surface and the perpendicular surface of the concave portion being disposed facing with gaps between both of the slanted surface and the perpendicular surface of the convex portion so that a heat expansion tolerance portion is provided between the concave portion and the convex portion.