Tonneau cover hinge

A hinge system is used to adjust a cover member between a closed position where the cover member covers at least a portion of a vehicle bed and an open position where the cover member does not cover the vehicle bed. The hinge system may include first and second arms that are pivotally attached and a biasing device operatively connected to the first and second arms that biases the cover member toward the open position whenever the cover member is not in the closed position and that does not bias the cover member toward the open position whenever the cover member is in the closed position.