Patent ID: 8632114

Claim:
A composite tonneau cover of a pick-up truck, which has at least one frame section and is releasably secured on a side wall of a cargo bed of the pick-up truck, wherein each of the frame section comprises: a flexible cover material; a rigid metal panel covered by the flexible cover material and having at least two end edges; and a plurality of outer rails covered by the flexible cover material, and each of the outer rails having an inner side formed with an installation groove; wherein each of the end edges of the rigid metal panel is inserted into the installation groove of one of the outer rails, wherein the frame section is provided with a clamp which is used to releasably secure the frame section on the side wall of the cargo bed of the pick-up truck, wherein the clamp comprises: a foundation rail connected to the frame section, and having two side grooves formed on two side surfaces of the foundation rail, and a recess formed between the two side grooves; a sliding block having two side hangers extended into the two side grooves and slidably moving along the two side grooves, and a pivotal portion received in the recess; a clamp bolt having a pivotal end pivotally connected to the pivotal portion of the sliding block, and a thread end; a composite grip element movably mounted on the clamp bolt, and having a metal grip body which is formed with an engaging portion and an installation hole and a plastic sleeve which passes through the installation hole of the metal grip body and is formed with a first abutment flange and a second abutment end facing on the sliding block; and a turning handle rotatably and movably connected to the thread end of the clamp bolt, and having a push surface to smoothly abut against the first abutment flange of the plastic sleeve of the composite grip element, so as to control the engaging portion of the metal grip body of the composite grip element to stably engage with the side wall of the pick-up truck.