Patent ID: 8522407

Claim:
An injection moulded thermoplastic object, the moulded object comprising: a moulded base having a top that forms a base plane; at least one hook protruding from the base plane and moulded in one piece with the base, the at least one hook comprising a base part and a head part protruding from the base part, the at least one hook being delimited by first and second lateral surfaces each extending from the base plane and being separated from each other by an intermediate surface forming an edge of the at least one hook, the at least one hook has curve sections defined by intersections of the first and second lateral surfaces with planes which are parallel with the base plane and which are at given distances h from the base plane, the curve sections have respective curvatures which vary as a function of the distance h, the curvature of the curve section for h=0 being greater than the curvature of a curve section for a distance h substantially corresponding to a level of the head part of the at least one hook, and wherein the minimum thickness of the base part proximate the base plane is smaller than the minimum thickness of the at least one hook at a plane parallel to the base plane that is substantially at the level of the head part of the at least one hook, wherein each curved section is concave and curves inward toward the interior of the at least one hook so that the curve sections of the first and second lateral surfaces have opposed concavities.