On the folding bed sofa, the connection part of each cushion keeps a certain curved space, moving from the cushion edge to the inside position, That is to say, because it is limited between the starting points of each space, the wear at the end of the contact line is eliminated, and the cushions at the front and rear ends can be signed through the signing mouth, so when forming the sofa, the solid and unitary fixing means are given as a whole.The sofa caused by the signing of this study will not collapse each other when moving, and its moving means are extremely effective.
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