Patent ID: 7090905

Claim:
An element, said element being flat or semi-flat and comprising a partly or completely circumambient frame, which element is manufactured through injection molding of a thermoplastic polymeric material, wherein the element comprises a carrying structure constituted by the frame, said frame having a corner section and a straight section, and a wall section, which wall section is connected to the circumambient frame via a resilient section, the resilient section being a part of the wall section, wherein differences in the temperature related shrinkage between the circumambient frame and the wall section are absorbed by the resilient section whereby the resilient section prevents warping of the element, wherein the wall section is connected to the straight section of the frame, and a material thickness of the wall section is thinner closest to the connection between the frame and the wall section than the average thickness of the wall section and the frame, wherein a pivot line is formed, which pivot line facilitates resilient action in the wall section.