Patent attributes
A tonneau cover system for a pickup truck cargo box comprising a tonneau cover sized and shaped for covering the cargo box. A side rail comprises a first clamping surface adapted to engage the first side of the downward flange. A rod has a rod axis and is mounted on the side rail. A clamp body is mounted on the rod and includes a clamp arm having a second clamping surface adapted to engage the second side of the side rail. A cam is included with one of the side rail and the clamp body. A cam follower engages with the cam. The cam follower is included with the other one of the side rail and the clamp body. Movement of the clamp body along the axis of the rod advances the cam follower along the cam to thereby move the first clamping surface toward the second clamping surface.