US Patent 11324324 Furniture member having lumbar adjustment mechanism

A seating or furniture assembly may include a seat bottom, a seatback, and a lumbar adjustment assembly. The seatback is disposed adjacent the seat bottom and includes a seatback frame. The lumbar adjustment assembly may be mounted to the seatback frame and may include a rail, a threaded rod disposed within the rail, a first slider block slidably engaging the rail, a second slider block slidably engaging the rail, a third slider block engaging the rail, a lumbar pad, and a plurality of links connecting the lumbar pad to the first, second, and third slider blocks. The threaded rod includes a first threaded section having threads with a first handedness and a second threaded section having threads with a second handedness that is opposite the first handedness. The first and second slider blocks threadably engage the first threaded section. The third slider block threadably engage the second threaded section.