US Patent 11358448 Retractable cover with guided axial bearing

A tonneau cover system, comprising: (a) a retractable tonneau cover having a plurality of interconnected panels; (b) a first retainer secured to a first sidewall of a cargo box of a vehicle; and (c) a second retainer secured to an opposing second sidewall of the cargo box, wherein the first retainer and the second retainer are substantially parallel to each other so that the tonneau cover spans between the first retainer and the second retainer; and wherein the plurality of panels each include a bearing positioned within the first retainer to guide the tonneau cover in a direction substantially parallel to a longitudinal axis of the first retainer.