A seat positioning system includes a base frame having a pair of forward slots and a pair of rear slots, and a seat frame having a front end and a back end. The seat frame is coupled to the base frame and movable relative to the base frame. A first pair of linkages is slideably coupled to the pair of forward slots and connects the frames. A first pair of locking devices has a locked configuration adapted to prevent the first pair of linkages from sliding relative to the pair of forward slots and an unlocked configuration adapted to allow the first pair of linkages to slide relative to the pair of forward slots. A second pair of linkages slideably is coupled to the pair of rear slots and connects the frames. An actuator is pivotally connected to both the seat frame and the base frame and is configured to extend and contract to move the seat frame relative to the base frame.

A seat positioning system includes a base frame having a pair of forward slots and a pair of rear slots, and a seat frame having a front end and a back end. The seat frame is coupled to the base frame and movable relative to the base frame. A first pair of linkages is slideably coupled to the pair of forward slots and connects the frames. A first pair of locking devices has a locked configuration adapted to prevent the first pair of linkages from sliding relative to the pair of forward slots and an unlocked configuration adapted to allow the first pair of linkages to slide relative to the pair of forward slots. A second pair of linkages slideably is coupled to the pair of rear slots and connects the frames. An actuator is pivotally connected to both the seat frame and the base frame and is configured to extend and contract to move the seat frame relative to the base frame.

A mechanical linkage structure for linking a chair and a seat, comprises a first link, a second link, and a third link respectively used as a driven link, a fourth link used as a driving link, a fifth link, a sixth link, and a seventh link respectively used as a driven link. The first link is pivotally connected to the second link and the third link, respectively; the second link is pivotally connected to the fourth link and the fifth link, respectively; the third link is pivotally connected to the fourth link, the fifth link, and the seventh link, respectively; the fifth link is pivotally connected to the sixth link; the sixth link is pivotally connected to the seventh link; the fourth link is driven to rotate the first link, the second link, the third link, the fifth link, the sixth link and the seventh link, to realize the unfolding or collapse of the mechanical linkage structure.

A mechanical linkage structure for linking a chair and a seat, comprises a first link, a second link, and a third link respectively used as a driven link, a fourth link used as a driving link, a fifth link, a sixth link, and a seventh link respectively used as a driven link. The first link is pivotally connected to the second link and the third link, respectively; the second link is pivotally connected to the fourth link and the fifth link, respectively; the third link is pivotally connected to the fourth link, the fifth link, and the seventh link, respectively; the fifth link is pivotally connected to the sixth link; the sixth link is pivotally connected to the seventh link; the fourth link is driven to rotate the first link, the second link, the third link, the fifth link, the sixth link and the seventh link, to realize the unfolding or collapse of the mechanical linkage structure.

A multimedia chair includes a base, seat support, seat, opposing side supports, and arm rests supported on the opposing side supports. A controller is supported by an arm rest attached to a side support, and a display and multimedia module are supported and connected to a controller supported by one of the arm rests. An adjustable foot support and reclinable back seat are actuated by a user authorization module, wherein upon receiving a credit card authorization or wireless authorization signal from a wireless device, the seat is enabled for use. The reclinable back seat is pivotally connected to one of the opposing side supports and an adjustable foot support is pivotally attached to the seat.

A multimedia chair includes a base, seat support, seat, opposing side supports, and arm rests supported on the opposing side supports. A controller is supported by an arm rest attached to a side support, and a display and multimedia module are supported and connected to a controller supported by one of the arm rests. An adjustable foot support and reclinable back seat are actuated by a user authorization module, wherein upon receiving a credit card authorization or wireless authorization signal from a wireless device, the seat is enabled for use. The reclinable back seat is pivotally connected to one of the opposing side supports and an adjustable foot support is pivotally attached to the seat.

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.

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.

A mechanical extending linkage is configured to be mounted in a seating unit capable of being moved between a retracted position and an extended position and comprising a seat, a backrest and extendable primary and secondary footrests. The mechanical extending linkage comprises a footrest assembly for extending and retracting the primary footrest and the secondary footrest, the footrest assembly comprising a primary footrest link, a secondary footrest link, and an intermediate link set having a first intermediate link, a second intermediate link, a third intermediate link and a fourth intermediate link. The footrest assembly is configured in such a manner that the secondary footrest link, the first intermediate link and the second intermediate link are arranged substantially parallel with the seat when the seating unit is in the retracted position.

A seat positioning system includes a base frame having a pair of forward slots and a pair of rear slots, and a seat frame having a front end and a back end. The seat frame is coupled to the base frame and movable relative to the base frame. A first pair of linkages is slideably coupled to the pair of forward slots and connects the frames. A first pair of locking devices has a locked configuration adapted to prevent the first pair of linkages from sliding relative to the pair of forward slots and an unlocked configuration adapted to allow the first pair of linkages to slide relative to the pair of forward slots. A second pair of linkages slideably is coupled to the pair of rear slots and connects the frames. An actuator is pivotally connected to both the seat frame and the base frame and is configured to extend and contract to move the seat frame relative to the base frame.