Patent ID: 8316609

Claim:
A panel unit for constructional purposes, comprising a body portion and at least two joining flanges, said at least two joining flanges each projecting from opposite surfaces of a pair of outer surfaces of the body portion, said outer surfaces being configured such that a maximum distance between the outer surfaces defines a maximum thickness of the panel unit at a location adjacent or spaced from said joining flanges and said at least two joining flanges each being located at, or close to, a common end surface of the panel unit and projecting away from each other in mutually opposite directions, and said flanges being arranged such that at least one of the flanges projects outside said maximum thickness of the panel unit from a respective one of the outer surfaces, wherein the flanges projecting from at least one of the outer surfaces of the body portion have multiple detents on an outer surface configured for engaging and gripping compatible multiple detents in an internal surface of a female connector.