US Patent 7185935 Truck bed cover

A uniquely designed truck bed cover for securing cargo in a truck bed includes a lower section having a bottom wall with a pair of upstanding sidewalls extending therefrom. Formed on the bottom wall is an elongated groove configured to slidably receive a beam mounted on the bottom surface of the truck bed. On the exterior surface of each sidewall is a ball bearing. The device also includes an upper section having a top wall with a pair of sidewalls depending therefrom. Each sidewall includes an L-shaped channel formed on the interior surface thereof that receives one of the ball bearings on the lower section to cooperatively join the two sections.