Patent ID: 7162838

Claim:
A constructional panel comprising a central section and two opposed end sections, said central section being of generally rectangular form with two parallel external side edges and two parallel end edges, each said end section having an isosceles trapezoid part conjoined to a rectangular part, said trapezoid part having parallel long and short edges and a pair of external oblique edges, and said rectangular part having a pair of parallel first edges and a pair of external second edges, the short edge of the trapezoid part conjoining an end edge of the central section and the long edge conjoining a first edge of the rectangular part, the other first edge of the rectangular part being external, and the length of the external side edges of the central part being substantially twice the length of the each second edge of the rectangular parts, whereby one said panel may be interengaged with other like panels by an oblique edge of an end section of said one panel being engageable with an oblique edge of an end section of a second panel, a second edge of the rectangular part of the interenchageable end sections of each of the two panels being engageable with the respective side edge of the central section of the other panel, and a third panel may be interengaged with said two panels in a similar manner whereby an end section thereof is engageable with an end section of said one panel and the external first edge of said end section of the third panel is engageable with the corresponding external first edge of said second panel, characterized by the feature that at least some of the external edges of the one panel are configured for connection to the corresponding edaes of the second like panel by providing on one of the edges which interengages the other edge, one or more projections, and on that other edge corresponding one or more recesses for receiving each projection.