US Patent 7837261 Seat arrangement

A seat arrangement for an aircraft seat includes a seat frame for mounting the seat on a cabin floor and a seat region. The seat arrangement has a backrest unit and is designed to improve stiffness of the backrest unit against one-sided torsional load. The backrest unit is coupled to the seat frame by a kinematic unit having at least first and second kinematic parts coupled to a first side and a second side of the backrest unit, respectively. A stiffening member is located in the seat region that couples the first and second kinematic parts and is provided for transmitting a torsional moment from the first side of the backrest unit to the second side of the backrest unit.