Patent ID: 8220217

Claim:
A flooring comprising: an interlocking joint having a first side defining a first mating portion and a second side defining a second mating portion, the second side being disposed opposite said first side; the first mating portion having a substantially arcuate groove formed therein and extending along at least a portion of the first side; the arcuate groove having a recess and a raised lip portion; a rotatable cam disposed in the arcuate groove extending in a longitudinal direction along at least a portion of the first side; the rotatable cam having a main body, a first arm connected to a first end of the main body, and a second arm connected to a second end of the main body; the first arm having a first stopper thereon; the second arm having a second stopper thereon; the second stopper and the raised lip portion being seated in a mating relationship and ensuring that the rotatable cam stays securely inside the arcuate groove; a convex head formed on the main body and being close to the first arm; a lower lip extending outward from the first mating portion beyond the arcuate groove; the second mating portion having a tongue extending perpendicularly from the second side and extending along at least a portion of the first side and defining a substantially concave groove along an undersurface receiving the lower lip; the second mating portion further defining a locking groove formed therein above the tongue to receive the convex head; wherein the tongue enters the arcuate groove and presses against the main body and the rotatable cam rotates until the first stopper reaches and abuts an end of the recess, thus providing a tight locking connection.