Tonneau cover system and side lock clamp

1. A tonneau cover system for a cargo box of a pickup truck, the cargo box comprising a frame, the tonneau cover system comprising:

a tonneau cover for covering the cargo box, and

a clamp to secure the tonneau cover to the frame, the clamp comprising:

a first clamp member coupled to the tonneau cover and having a first clamping surface;

a second clamp member coupled to the tonneau cover and having a second clamping surface, the second clamp member being moveable relative to the first clamp member between an unclamped position and a clamped position;

a ramp mechanism including at least one ramp surface between the first and second clamp members shaped to cause lateral translation of the second clamping surface toward the first clamping surface in response to movement of the second clamp member toward the tonneau cover as the clamp moves from the unclamped position to the clamped position; and

a cam lock member positioned to engage with the second clamp member and including a lever for placing the cam lock member in a locked state or an unlocked state, wherein the cam lock member causes the second clamp member to move toward the tonneau cover as the cam lock member moves from the unlocked state to the locked state and causes the second clamp member to move away from the tonneau cover as the cam lock member moves from the locked state to the unlocked state.

2. The tonneau cover system according to claim 1 , wherein the clamp further comprises a rod upon which the first clamp member, the second clamp member, and the cam lock member are mounted.

3. The tonneau cover system according to claim 2 , wherein the second clamp member and the cam lock member are slidably mounted on the rod, and the cam lock member slidingly moves the second clamp member along the rod as the lever rotates to place the cam lock member in the locked state or the unlocked state.

4. The tonneau cover system according to claim 1 , wherein the cam lock member further comprises a cam attached to the lever, wherein the cam engages with the second clamp member to slidingly move the second clamp member as the lever rotates to place the cam lock member in the locked state or the unlocked state.

5. The tonneau cover system according to claim 1 , wherein, when in the clamped position, the first clamping surface of the first clamp member is in opposed relationship to the second clamping surface to apply a clamping force therebetween.

6. The tonneau cover system according to claim 1 , wherein the second clamping member is in the clamped position when the cam lock member is in the locked state.

7. The tonneau cover system according to claim 1 , wherein the second clamping surface moves toward the first clamping surface by way of the ramp mechanism as the lever rotates to place the cam lock member in the locked state and the second clamping surface moves away from the first clamping surface by way of the ramp mechanism as the lever rotates to place the cam lock member in the unlocked state.

8. The tonneau cover system according to claim 1 , wherein the cam lock member further comprises a cam that is attached to the lever to translate a rotational movement of the lever to a lateral movement for moving the second clamp member.

9. The tonneau cover system according to claim 1 , wherein the first and second clamp members are mounted on a rod defining an axis, and wherein a first of the at least one ramp surface extends at an acute angle relative to the axis and is integral with the first clamp member.

10. The tonneau cover system according to claim 9 , wherein a second of the at least one ramp surface extends at a complementary angle to the acute angle and is integral with the second clamp member.

11. The tonneau cover system according to claim 1 , wherein, when in the clamped position, the first and second clamping surfaces are positioned to apply a clamping force to the frame throughout an area defined by overlapping opposing contacting portions of the first and second clamping surfaces, with the area having dimensions that are large enough to reinforce the frame sufficiently to avoid permanent deformation of the frame under loads transmitted by the clamp to the frame during normal vehicle operation.

12. The tonneau cover system according to claim 1 , wherein the second clamp member includes a distal member positioned at a distal end of the second clamp member, wherein the distal member has a flexible surface that forms the second clamping surface of the second clamp member.

13. The tonneau cover system according to claim 1 , wherein the second clamp member includes a distal member positioned at a distal end of the second clamp member, and wherein the frame comprises a sidewall having a ledge and a flange depending from the ledge, and wherein the distal member includes a side clamping surface for engaging the flange opposite the first clamp member for applying a clamping force therebetween and an upper clamping surface for engaging an underside of the ledge.

14. The tonneau cover system according to claim 13 , wherein the tonneau cover extends over the ledge, and wherein the upper clamping surface is adapted for applying a clamping force to the underside of the ledge opposite the tonneau cover.

15. The tonneau cover system according to claim 13 , wherein the distal member is pivotally mounted to the distal end of the second clamp member.