One piece flexible hinge having engaging ridges and a rib

Claim 1

In a container, a lid comprising a first panel and a hinge connecting the first panel to a second panel of the container substantially the entire length thereof, the hinge comprising a first member and a second member each U-shaped in cross-section with a pair of side walls and a base, one of the side walls of each member having a rib parallel to the base and projecting towards the other wall, a groove in the outer face of the first panel parallel to and adjacent one edge thereof with the rib of the first member engaging the groove of the first panel, a groove in the outer face of the second panel parallel to and adjacent one edge thereof with the rib of the second member engaging the groove of the second panel, and a flexible web interconnecting the base of the first member and the second member and integral therewith, the web and said one of the side walls of each member having the rib being coplanar with each other when the hinge is in a relaxed position, the other of the side walls of each said member being coplanar with each other when the hinge is in said relaxed position, said base of each of said members being substantially parallel to each other when the hinge is in said relaxed position, in which the first panel comprises the top of the container which is fixed to a pair of opposed side walls at each end thereof, and a slot in each side wall bounded by the top whereby the hinge is slidable laterally onto the first panel.