A sofa bed with three moving seat bases that transforms between a bed configuration and a sofa configuration. The sofa bed includes supporting legs and armrest. Each of the seat bases, and corresponding cushions, are located between the armrests. The seat bases are interconnected with a set of slide rails that allow the seat bases to move relative to one another. The sofa bed also includes a locking mechanism to hold the sofa bed in the sofa configuration.

A seat assembly includes independently rotatable and reclinable seats. The seats have back support sections that can be rotated between a sofa position and a compact position as well as the sofa position and a reclined position. The seats can further include leg rests that are movable between a lowered position and a raised position.

A modular sofa bed, wherein the modular sofa bed comprises: one or more base modules, wherein each of the base modules comprises a hollow base frame and a seat board module detachably set to the hollow base frame; one or more backrest modules, wherein each of the backrest modules is detachably connected to a corresponding one of the base modules; and two handrail modules, detachably set on two outer sides of the base modules, respectively.

A convertible chair-bed is provided, including: a fixed bed frame and a movable bed frame; a head frame body, a hip frame body, a leg frame body, and a tail frame body that are rotatably connected in sequence, wherein the head frame body and the hip frame body are both lapped on the movable bed frame; a rear extension rod fixedly arranged at a bottom of the hip frame body; a diagonal stay, wherein two ends of the diagonal stay are respectively rotatably connected to a front end of the tail frame body and the fixed bed frame; a rotating stand rotatably mounted on the movable bed frame; a first telescopic rod; and a second telescopic rod, wherein two ends of the second telescopic rod are respectively rotatably connected to the head frame body and the movable bed frame.

A fixing structure for a cushion layer of a sofa bed is provided. The sofa bed includes a left armrest, a right armrest, and a bed frame. A position of the bed frame is fixedly located between the left armrest and the right armrest, and the bed frame is disposed with an elastic layer and a cushion layer in sequence. The elastic layer includes a plurality of first connecting members spaced apart from each other in a circumferential direction of the elastic layer. A lower surface of the cushion layer includes a plurality of second connecting members spaced apart from each other in a circumferential direction of the cushion layer, and the plurality of first connecting members are connected to the plurality of second connecting members through one or more intermediate connecting members.

A folding mechanism of a sofa bed includes a left armrest, a right armrest, a bed frame, and a locking mechanism. The bed frame includes a first bed frame and a second bed frame. The first bed frame is fixedly connected to the left armrest and the right armrest. The second bed frame is rotatably connected to the left armrest and the right armrest. The left armrest and the right armrest are rotatably connected to the second bed frame through folding hinges. The folding hinge includes a first supporting arm and a second supporting arm which are pivotally connected to each other. The first supporting arm is fixedly connected to the left armrest or the right armrest, and the second supporting arm is fixedly connected to the second bed frame. The locking mechanism locks the first bed frame and the second bed frame in one or more relative positions.

A connecting structure for a plurality of elastic units of a sofa bed is provided. The sofa bed includes a bed frame, and the bed frame is configured be alternatively changed between a flat state and a backrest state. The bed frame is disposed with a bed board on which the plurality of elastic units are configured to be disposed. A surface of the bed board is disposed with a plurality of fixing members spaced apart from each other and configured to be connected to the plurality of elastic units, and a bottom of at least one of the plurality of elastic units includes a fixing fitting member configured to be matched with a corresponding one of the plurality of fixing members. The fixing fitting member and the corresponding one of the plurality of fixing members form a detachable connection relationship.

A flexible and portable sofa bed comprises a cushion assembly and a support frame; the cushion assembly is provided with a front cushion, a center cushion and a back cushion along the longitudinal direction, one ends of the front cushion and the center cushion are foldable connected, and the back cushion can be independently turned relative to the center cushion; the center cushion is connected with the support frame in a sliding way, and the back cushion is connected with the support frame in a rotating way. The movable connection of the cushion assembly and the support frame enables the sofa bed to change its working state.

The invention discloses a sofa seat frame, a sofa base assembly, a sofa and a sofa production and assembly process, the sofa seat frame comprises two cross beams arranged at intervals and two longitudinal beams connecting the two cross beams, wherein a plurality of supporting elastic pieces are arranged between the two cross beams; and each longitudinal beam comprises a first supporting plate for supporting a seat cushion and a first side plate arranged at one side of the lower part of the first supporting plate and used for being detachably connected with sofa fabric on the seat cushion. In the sofa seat frame provided by the invention, when the seat cushion is placed on the supporting elastic pieces, the first supporting plates can give a certain supporting force to the seat cushion, so as to improve the sitting comfort of users.

An electromechanical stretching apparatus of a convertible sofa consisting of a mechanical stretching apparatus and an electric actuator, the mechanical stretching apparatus provided with an electrically-driven connecting rod, where the electric actuator consists of a motor, a motor connecting tube, a motor movable slider, and a motor head fixing part, the motor adopted is a motor with a guide rail, the motor movable slider is installed on the guide rail of the motor, the motor head is rotationally connected through a second rotor shaft to the motor head fixing part fastened on the electrically-driven connecting rod, the motor connecting tube is connected to the motor movable slider through a first rotor shaft and the motor connecting tube is fastened on the mechanical stretching apparatus. The motor connecting tube is fastened on a linkage part of the mechanical stretching apparatus. The first and second rotor shaft are both a bolt.