Patent ID: 7856776

Claim:
A plane structure, comprising: at least three longitudinal profiles extending equidistantly and mutually parallel in a longitudinal direction, the profiles having longitudinal axes in a plane of the plane structure; a number of substantially parallelepiped shaped elements, each being arranged between an adjacent pair of the profiles; wherein each of the substantially parallelepiped shaped elements is provided with at least one recess in both end walls of the element, the recesses being adapted for engagement by tongues arranged on the profiles; wherein the tongues are arranged equidistantly on the profiles with a distance between pairs of adjacent tongues on one side of the profile being smaller than a length of the substantially parallelepiped shaped elements; and wherein the tongues extend from the profiles within the plane of the plane structure and perpendicular to the longitudinal direction of the profiles into the recesses arranged in the end walls of the substantially parallelepiped shaped elements.