US Patent 10232744 Independent translating roller seat

A passenger seat is configured to adjust between an upright seating position and a lie-flat sleeping position, which includes one or more intermediate reclined seating positions, via independent rollers attached to the seat pan, or seat bottom, and to the backrest. As the passenger seat transitions between the upright seating position and the lie-flat sleeping position, guide channels set into the left and right frame rails direct the movement of the independent rollers through the guide channels and thereby control the angles of the seat pan and the backrest throughout the transition.