Patent ID: 7958689

Claim:
A floor panel with coupling devices comprising: an upper side for treading, an underside contacting the underlying floor, a first end wall and a second end wall parallelly located at a distance from each other and perpendicular to said upper side; a third end wall and a fourth end wall parallelly located at a distance from each other and perpendicular to said upper side, said first end wall and said third end wall being parallel to each other; a groove located between the first end wall and the third end wall, the groove extending along a longitudinal direction of said floor panel; a tongue extending outward between the second end wall and the fourth end wall, the tongue extending along a longitudinal direction of said floor panel; wherein said groove orderly comprising a first slot wall, a second slot wall, a third slot wall, a fourth slot wall, a fifth slot wall and a sixth slot wall; said first slot wall connecting said first end wall and being formed by a protrusion with a curved shape which protrudes downward towards the entrance of said groove; said second slot wall, said fourth slot wall and said sixth slot wall being parallel to said upper side; said third slot wall being parallel to said first end wall and extending in a direction towards said sixth slot wall; said fifth slot wall being parallel to said first end wall; said tongue orderly comprising a first side, a second side, a third side, a fourth side, a fifth side and a sixth side; said first side connecting said second end wall and being formed by a recess with a curved shape; said second side, said fourth side and said sixth side being parallel to said upper side; said third side being parallel to said second end wall and extending in a direction towards said sixth side; said first slot wall having the same curved shape and arc length as said first side of said tongue so that they can be meshingly engaged when adjacent identical ones of said floor panel are coupled together; the total length of said second slot wall and said fourth slot wall being longer than that of said second side and said fourth side of said tongue.