Abstract: A hinge for a foldable tonneau cover is provided and has two pivotal members, a base member and two detachable screwing assemblies. Each of the pivotal members is connected to at least one frame member of a frame section and has at least one first through hole. The base member has at least two second through holes, each of which is corresponding to the first through hole of each of the pivotal members. Each of the detachable screwing assemblies has a bolt member and a nut member. The bolt member has a thread rod, the nut member has a thread hole provided with a tight fitting member inserted therein, and the thread rod of the bolt member is screw-connected to the thread hole of the nut member and tightly fitted with the tight fitting member in the thread hole.

Abstract: A composite tonneau cover of a pick-up truck is disclosed. The composite tonneau cover has at least one frame section and is releasably secured on a side wall of a cargo bed of the pick-up truck. 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. Each of the outer rails has an inner side formed with an installation groove, and each of the end edges of the rigid metal panel is inserted into the installation groove of one of the outer rails. Thus, the composite tonneau cover can provide dual advantages of hard-top type tonneau cover and soft-top type tonneau cover.

Abstract: A tension control assembly for a flexible tonneau cover system of a pick-up truck has an adjustable engagement plate and a screw assembly. The adjustable engagement plate has an engagement hook to selectively engage in one of engagement holes formed on a side rail, and further has a positioning hole to position the screw assembly according to the engagement relationship between the engagement hook and the engagement holes, so that the adjustable engagement plate and the screw assembly can be used to adjust and stably keep a longitudinal position of a front header in relation to a length direction of the side rail, so as to prevent from causing vibration noise. Meanwhile, a transverse position of the front header in relation to a width direction of the side rail can be simultaneously adjusted during adjusting the longitudinal position of the front header.

Abstract: A side fastening assembly for a flexible tonneau cover system of a pick-up truck is provided and has a first fastener sewn on an elongated slat by two sewing threads. The first fastener sewn on the elongated slat can ensure the attachment strength of the first fastener, so as to elongate the lifetime of the first fastener and lower the maintenance cost thereof. The side fastening assembly further has a second fastener attached to a flexible cover material of a flexible cover assembly. The first fastener and the second fastener are engaged with each other in a case that the flexible cover material is unrolled rearward on the side rail to cover the cargo bed.

Abstract: A clamp structure for a tonneau cover of a pick-up truck is disclosed and mounted to one frame section of a tonneau cover for releasably securing the frame section on a side wall of a cargo bed of the pick-up truck. The clamp structure has a composite grip element which has a metal grip body and a plastic sleeve. The metal grip body has an engaging portion to stably engage with the side wall of the pick-up truck. The plastic sleeve has a first abutment flange to smoothly abut against a turning handle, and a second abutment end facing a sliding block. Thus, the composite grip element can provide advantages of both of metal and plastic material, so that the operational stability and reliability of the clamp structure can be enhanced, and the lifetime thereof can be elongated.

Abstract: A clamp structure for a tonneau cover is disclosed and mounted to one frame section of a tonneau cover for releasably securing the frame section on a cargo bed of a pick-up truck. The clamp comprises: a foundation rail having two side grooves and a recess formed between the two side grooves; and a sliding block having two side hangers extended into and slidably moving along the two side grooves and a pivotal portion received in the recess; a clamp bolt; a grip element; and a handle. The side hangers of the sliding block is used to slidably move along the side grooves of the foundation rail, so that the sliding movement of the clamp structure pivotally connected to the sliding block in relation to the foundation rail is more stable and smooth based on two strong support points of the two side hangers in the two side grooves.