Patent ID: 7980040
Filing Date: 2011-07-19
Classification: A47G,E04B,F16B

Abstract:
1. A first sheet member to connect to an overlapped second sheet member to form a substantially horizontal surface comprising the following: (a) the first sheet member being a regular geometric shape and having at least one edge, a first surface, and a generally arcuate countersunk surface below the level of the first surface and at the edge of the geometric shape; (b) the first sheet member having in the countersunk portion a first aperture, for receiving a second male member of the overlapped second sheet; (c) the first sheet provided on two opposite sides of the first aperture with second and third apertures proximate to the first aperture, so as to create areas in the sheet of increased flexibility about of the first aperture adjacent the second and third apertures to permit movement of the first sheet member relative to the second sheet member when the second male member is located within the first aperture.