Abstract: A coupling mechanism includes a seat frame; a leg rest; a backrest bracket; a carriage slidably connected to the seat frame; a linkage assembly for backrest connected to the backrest bracket, the seat frame and the carriage; a linkage mechanism for leg rest connected to the carriage and the leg rest, so that the leg rest can move toward or away from the carriage; a coupling assembly rotationally connected to the carriage, two ends of the coupling assembly are respectively articulated to the seat frame and the linkage mechanism for leg rest; a drive assembly connected to the carriage, to drive the leg rest and the backrest bracket to move relative to the seat frame; wherein during operation of the drive assembly, the carriage slides relative to the seat frame, and the leg rest and the backrest bracket move and rotate relative to the seat frame.

Abstract: The present application discloses a multifunctional iron frame and seat, including a driving mechanism, a leg support mechanism, and a linkage mechanism. The leg support mechanism includes a leg support skeleton and a support plate. The linkage mechanism is connected between the driving mechanism and the leg support skeleton. When the multifunctional iron frame is rotated from a sitting state to a first position, the leg support skeleton rotates relative to the seat frame, and a rotation radius of the support plate at the first position is not greater than in the sitting state. When the multifunctional iron frame is rotated from the first position to a lying state, the leg support skeleton rotates relative to the seat frame and the support plate slides relative to the leg support skeleton. The rotation radius of the support plate in the first position is smaller than that in the lying state.

Abstract: Provided is a beam-column joint of a prefabricated self-centering RC (Reinforced Concrete) frame based on an SMA (Shape Memory Alloy) material, including an RC precast column, an RC precast beam, and self-centering energy dissipation dampers arranged, and a friction energy dissipation damper. The self-centering energy dissipation damper includes an SMA kernel, an upper restraint cover plate, a lower restraint cover plate, a column-end connection reinforcing plate and a beam-end connection reinforcing plate, and a set energy dissipation gap is reserved between the SMA kernel and the upper restraint cover plate. The friction energy dissipation damper includes an in-column embedded connecting plate and a beam-end embedded connecting plate.

Abstract: The present application relates to the technical field of sofa, and in particular to a compact sofa frame structure, including a base frame and a slidable frame. The base frame is provided with an adjusting assembly. The adjusting assembly includes a driving rod and a driven rod; in which the driving rod and the driven rod are both rotatably connected at one end thereof on the base frame and rotatably connected to the backrest at the other end thereof; a linkage rod rotatably connected on the driving rod; the frame is provided with a driving assembly configured to drive a leg rest rotatably connected on the slidable frame to rotate; the slidable frame is provided with a fixing rod configured to limit the leg rest.