Retractable cover with guided axial bearing

1. 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, the first retainer having a supporting portion that supports the tonneau cover, wherein the supporting portion includes a rail; and

(c) a second retainer secured to an opposing second sidewall of the cargo box, the second retainer being substantially parallel to the first retainer so that the tonneau cover spans between the first retainer and the second retainer, wherein the second retainer includes a sliding contact surface secured to a supporting portion of the second retainer to support the tonneau cover during movement; and

wherein the plurality of panels each include bearings positioned within the first retainer to guide the tonneau cover in a direction substantially parallel to a longitudinal axis of the first retainer; and

wherein each bearing includes a groove, and the rail of the supporting portion is at least partially positioned within the groove so that the bearings of each panel is guided along the rail.

2. The tonneau cover system of claim 1 , wherein the first retainer prevents vertical or lateral movement of the tonneau cover in a direction other than the direction substantially parallel to the longitudinal axis of the first retainer.

3. The tonneau cover system of claim 1 , wherein the bearings rest upon a rail of the first retainer and guides the tonneau cover along the rail.

4. The tonneau cover system of claim 1 , wherein the second retainer is free of a rail.

5. The tonneau cover system of claim 4 , wherein the sliding contact surface supports the tonneau cover as the tonneau cover is guided along the rail.

6. The tonneau cover system of claim 1 , wherein a first end of each panel includes the bearings and is positioned within the first retainer, and a second opposing end of each panel is positioned within the second retainer and is free of bearings.

7. The tonneau cover system of claim 1 , wherein the first retainer and the second retainer each include an engaging portion having a seal that compressibly contacts the tonneau cover to prevent moisture, debris, or both from entering the retainers.

8. The tonneau cover system of claim 1 , wherein the first retainer and the second retainer each include:

(a) a contoured projection that is configured to abut a vertical lip of the sidewalls;

(b) a mounting portion that abuts a portion of the sidewalls so that the sidewalls at least partially support the retainers;

(c) a supporting portion that at least partially supports the tonneau cover, wherein the supporting portion guides the tonneau cover along the direction substantially parallel to the longitudinal axis of the first retainer; and

(d) an engaging portion, the engaging portion including a seal that compressibly contacts the tonneau cover to prevent moisture, debris, or both from entering the retainers.

9. The tonneau cover system of claim 1 , wherein the rail is spaced apart from a surface of the supporting portion by a spacer.

10. The tonneau cover system of claim 1 , wherein each bearing is secured to each corresponding panel by a threaded fastener so that each bearing and each corresponding panel are substantially coaxial.

11. The tonneau cover system of claim 1 , wherein the bearings of each panel are secured to a terminal end of a crossmember of the panel.

12. A tonneau cover system, comprising:

(a) a retractable tonneau cover having a plurality of interconnected panels, at least a portion of the plurality of panels having a bearing secured near a terminal end;

(b) opposing retainers secured to opposing sidewalls of a cargo box of a vehicle so that the tonneau cover extends between the opposing retainers, wherein the tonneau cover is supported by a supporting portion an inner surface of each retainer; and

(c) a lock rail mounted along an outer surface of the supporting portion of one of the retainers free of interference with the inner surface of the supporting portion that receives the tonneau cover, wherein the lock rail engages a lock mounted to the tonneau cover and the lock includes a finger that is guided along a channel of the lock rail so that the lock moves simultaneously with the tonneau cover;

wherein at least one of the opposing retainers includes opposing rails positioned within the supporting portion and a groove of the bearings is guided along the opposing rails to move the tonneau cover.

13. The tonneau cover system of claim 12 , wherein a first retainer includes the opposing rails and a second retainer is free of any rails.

14. The tonneau cover system of claim 13 , wherein the second retainer includes a sliding contact surface that supports the tonneau cover as the tonneau cover is guided along the opposing rail of the first retainer.

15. The tonneau cover system of claim 12 , wherein at least one of the opposing rails is spaced apart from the supporting portion by a spacer secured to the supporting portion by one or more fasteners.

16. The tonneau cover system of claim 12 , wherein the first retainer prevents vertical and lateral movement of the tonneau cover in a direction other than a direction substantially parallel to a longitudinal axis of the first retainer.

17. The tonneau cover system of claim 12 , wherein the opposing retainers each further include:

(a) a contoured projection that is configured to abut a vertical lip of the sidewalls;

(b) a mounting portion that abuts a portion of the sidewalls so that the sidewalls at least partially support the retainers; and

(c) an engaging portion, the engaging portion including a seal that compressibly contacts the tonneau cover to prevent moisture, debris, or both from entering the opposing retainers.

18. The tonneau cover system of claim 17 , wherein the bearing of each panel is secured to a terminal end of a crossmember of the panel.

19. The tonneau cover system of claim 12 , wherein the lock is mounted to one of the plurality of panels so that the finger of the lock is positioned beneath the plurality of panels.