Patent ID: 7406920

Claim:
A shelf system for storage and filing of objects, comprising: at least one shelf unit having a quadrilateral cross-sectional configuration; vertical longitudinal posts disposed at corners of said shelf unit; horizontal crosspieces disposable between two front ones of said posts, wherein said crosspieces are provided with vertically and horizontally spaced-apart, downwardly directed pairs of hooks, and wherein said posts are provided with recesses for receiving said hooks of said crosspieces, wherein the hooks penetrate into said recesses of said posts; and supporting boards respectively provided with a downwardly directed front flap, wherein said flaps are adapted to be firmly wedged between said crosspieces and the posts that receive them to prevent lifting of said supporting boards, wherein the hooks are adapted to provide a firm contact pressure of the flaps at the posts, and wherein said crosspieces are comprised of a basic structural component that overlaps at least said front flap of said supporting board wherein said crosspiece is provided with a reinforcing member in which are formed at least upper ones of said hooks, and wherein said crosspiece is provided with a reinforcing edge between said posts.