US Patent 8657358 Pickup truck bed tonneau cover support structure and method

An outer frame corresponds to a perimeter of a pickup truck bed. An plurality of upwardly bowed intermediate rail span between, and are coupled to, opposing sides of the outer frame. Each bowed intermediate rail is paired with a wire tension member that spans between, and is coupled to, each end of its paired intermediate rail member. A flexible textile member covers and is supported by the intermediate rail member and is coupled to the outer frame. The wire tension members operate to help reduce lateral deflection of the bowed intermediate rail members when a meaningful downward force is applied to the bowed intermediate rails. A method of assembling a tonneau cover is also disclosed.