Abstract: A folding chair device of the present invention includes a seat support assembly, a backrest assembly, a leg rest assembly, a backrest driving device, a connecting rod assembly and a leg rest driving device. A bottom of the backrest assembly is pivotally connected with the seat support assembly, the backrest driving device is pivotally connected with the backrest assembly; the leg rest assembly is pivotally connected with the seat support assembly, the leg rest driving device is mounted on the seat support assembly, and the connecting rod assembly is connected with a driving end of the leg rest driving device and pivotally connected with the leg rest assembly. The inclination angle of multiple assemblies of the device can be adjusted, and the device has a simple structure and low production cost, which is suitable for popularization in industry and daily life.

Abstract: An electric adjustment device for sofa headrest includes a first fixing member, a second fixing member, and a drive device having an output end that linearly reciprocates. One end of the second fixing member is pivotally connected to the first fixing member, and the drive device is pivotally connected to the first fixing member and arranged flush with the first fixing member. A sliding direction of the output end is perpendicular to a pivotal axis about which the second fixing member is pivotable to the first fixing member. Specifically, the second fixing member is extended downward to form a fixed end for fixing to a backrest support frame. The electric adjustment device is installed in the headrest support frame instead of the backrest support frame, so that other functional parts are installed inside internal space of the backrest support frame which improves the function of the sofa.

Abstract: A headrest angle adjuster includes a first fixing member, a second fixing member, a gear, a flexible member, a floating positioning member, and an engaging member. The gear is configured on the first fixing member which is hinged to the second fixing member; one end of the floating positioning member is movably sleeved on the gear, a driving hole is provided on the floating positioning member, a locking hole is provided on the first fixing member, the engaging member is located in the driving hole and the locking hole, and the floating positioning member swings and pushes the engaging member to move toward a narrower end of the locking hole, thereby guiding the engaging member to engage with the gear. The headrest can be positioned at any angle, and the adjustment is silent to improve user experience.