Tonneau cover system and side lock clamp

A tonneau cover system for a cargo box of a pickup truck, the cargo box comprising a frame including an outer wall, a ledge extending inboard from the outer wall and a flange extending downwardly from the ledge and spaced inboard from the outer wall, the flange including an outboard side facing the outer wall and an inboard side opposite the outboard side, the tonneau cover system comprising:

• a tonneau cover for covering the cargo box;
• and
• a clamp for securing the tonneau cover to the cargo box, the clamp comprising:
• a rod pivotably coupled to the tonneau cover and having an axis;
• a first clamp member threadably mounted on the rod and having a first clamping surface disposed to engage the flange, the first clamp member having a first ramp surface extending at an angle relative to the axis of the rod;
• a second clamp member slidably mounted on the rod and having a second clamping surface disposed to engage the flange, the second clamp member being axially moveable along the rod and, in response to the axial movement, the second clamp member being movable along the first ramp surface to cause translation of the second clamp member perpendicular to the axis toward the first clamp member from an unclamped position to a clamped position;
• a connector threadably mounted on the rod to engage and slide the second clamp member between the unclamped position and the clamped position;
• wherein, when in the clamped position, the first clamping surface of the first member is positioned to engage the inboard side of the flange and the second clamping surface of the second clamp member is positioned to engage an opposing portion of the outboard side of the flange to apply a clamping force to the flange.

A tonneau cover clamp for clamping a tonneau cover to a downwardly extending flange spaced inboard from an outer wall of a cargo box of a pickup truck, the tonneau cover clamp comprising:

• a rod having an axis extending from a pivotable coupling structured to couple the rod to the tonneau cover;
• a first clamp member coupled to the rod and having a first clamping surface;
• a second clamp member coupled to the rod and having a second clamping surface;
• a ramp mechanism including at least one ramp surface between the first and second clamp members shaped to cause translation of the second clamp member toward the first clamp member at an angle relative to the axis of the rod in response to movement of the second ramp member axially along the rod toward the first clamp member as the second clamp member moves from an unclamped position to a clamped position;
• and
• a manually rotatable connector threadably mounted on the rod to engage and slide the second clamp member between the unclamped position and the clamped position;
• wherein, the first clamping surface is positioned in opposing relationship to the second clamping surface to enable the first and second clamping surfaces to apply a clamping force to opposing sides of the downwardly extending flange when the second clamp member is in the clamped position.