Composite foorboard

Abstract

A composite floorboard is formed by two outer wooden layers and an intermediate flexible layer which has two longitudinal edges, two transverse edges. The flexible layer may be foam, sponge or any kinds of soundproof material. The composite floorboard has two surfaces, a transverse tongue, a longitudinal tongue, a longitudinal groove and a transverse groove each respectively defined in or formed on corresponding edges of the composite floorboard. Because the tongues are made by the flexible layer, the composite floorboard is easy and convenient to assemble. Because the flexible layer acts as a buffer, the composite floorboard provides a soundproofing function. The composite floorboard also requires less timber so may be lower cost to manufacture.

1 . A composite floorboard comprising two wooden layers and a flexible layer, wherein the flexible layer is mounted between the two wooden layers. 
     
     
         2 . The composite floorboard as claimed in  claim 1 , wherein each of the two wooden layers and the flexible layer has two longitudinal edges and two transverse edges. 
     
     
         3 . The composite floorboard as claimed in  claim 1 , wherein the composite floorboard comprises
 two longitudinal edges;   two transverse edges;   a transverse tongue protruding a distance from one of the transverse edges of the composite floorboard; a longitudinal tongue protruding a distance from one of the longitudinal edges of the composite floorboard; a longitudinal groove being defined in the composite floorboard at the other longitudinal edge and having a depth equal to the distance of the longitudinal tongue; and a transverse groove being defined in the composite floorboard at the other transverse edge and having a depth equal to the distance of the transverse tongue.   
     
     
         4 . The composite floorboard as claimed in  claim 1 , wherein each wooden layer further comprises
 a longitudinal strut and a transverse strut respectively formed on and protruding from the longitudinal and transverse edges of the wooden layer those correspond to the tongues of the composite floorboard; and   a longitudinal step and a transverse step being respectively defined in the longitudinal and transverse edges of the wooden layer those correspond to and align with the grooves of the composite floorboard.   
     
     
         5 . The composite floorboard as claimed in  claim 4 , wherein
 the struts are 0.5 mm to 1.0 millimeter (mm) in thickness; and   the steps are 0.5 mm to 1.0 mm in depth.   
     
     
         6 . The composite floorboard as claimed in  claim 1 , wherein the flexible layer is a foam layer. 
     
     
         7 . The composite floorboard as claimed in  claim 1 , wherein the flexible layer is a cork layer. 
     
     
         8 . The composite floorboard as claimed in  claim 1 , wherein the flexible layer is a rubber layer.