The structural principle of the Fold Out Recliner Chair mainly includes two parts: the frame and the seat part:

(1) Frame structure: The frame of the Fold Out Recliner Chair is usually made of metal or wood, including a support frame, a folding mechanism, and a fixed structure. The support frame is the main structural component that supports the entire chair, usually including a seat frame and a back frame. The folding mechanism is the key part to achieve the Fold Out Recliner Chair, usually consisting of several hinges and locks, so that the chair can be conveniently folded and fixed in a compact shape. Fixtures are the parts used to hold the different parts of the chair in place, usually including screws, springs, and other fixings.

(2) Seat part: The seat part of a Fold Out Recliner Chair usually consists of a cushion and a backrest, which are covered with various materials such as cloth, leather or synthetic materials. The structure of the seat portion is usually fastened to the frame structure by hooks or other connectors.

Overall, the structural design of the Fold Out Recliner Chair focuses on lightweight, easy to fold and store, and to provide sufficient support and comfort when in use. In the process of structural design and manufacturing, factors such as safety and durability also need to be considered.