Sofa bed

A sofa bed includes a mattress frame, a back frame, two arm frames and two cross beams, two arm frames are connected by the two cross beams, wherein the mattress frame and the back frame are rotatably pivoted. The inner side of the arm frame is disposed with a linking mechanism. The linking mechanism has a front connecting piece, rear connecting piece and a bridge connecting piece. Two ends of the bridge connecting piece are respectively pivoted to the front connecting piece and the rear connecting piece. The bottom end of the front connecting piece is pivoted to the arm frame. The bottom end of the rear connecting piece is pivoted to the arm frame. The linking mechanism has a front connecting piece, rear connecting piece and a bridge connecting piece.

FIELD OF THE INVENTION

The present invention relates to a new sofa bed.

BACKGROUND OF THE INVENTION

A sofa bed comprises a mattress frame, a back frame and two arm frames, the mattress frame and the back frame are connected to the arm frames by hinge devices. The hinge device comprises a base, a front side connecting piece, a front support plate, a rear side connecting piece, a rear support plate, a bridge connecting piece, a spring and a spring connecting piece; the front support plate and the rear support plate are respectively fixed to the mattress frame and the back frame, the front side connecting piece is disposed between the front support plate and the base, the rear side connecting piece is disposed between the rear support plate and the base, the bridge connecting piece is disposed between the front side connecting piece and the rear side connecting piece. Existing sofa bed has technical problems: firstly, the sofa bed needs large quantity of hinge devices, the structure is complicated, the cost is high, the weight of the sofa bed is also increased. Secondly, the hinge device needs large space, therefore, to increase the container quantity, the hinge devices are packed individually before the sofa bed leaves the factory; consumers need to install the hinge devices to the arms when assembling the sofa bed, and then fix the mattress frame and the back frame respectively to the front support plate and the rear support plate, the assembly is complicated. Thirdly, many bolts are needed to lock between the base and the arm, the front support plate and the mattress frame, the rear support plate and the back frame, the bolt quantity is large, the cost is high, the weight of the sofa bed is increased, the assembly is cumbersome.

SUMMARY OF THE INVENTION

The present invention is provided with a sofa bed with simple structure and convenient installation. The technical proposal of the present invention is that:

A sofa bed, comprising a mattress frame, a back frame, two arm frames and two cross beams, two arm frames are connected by the two cross beams, wherein the mattress frame and the back frame are rotatably pivoted, the inner side of the arm frame is disposed with a linking mechanism, the linking mechanism comprises a front connecting piece, rear connecting piece and a bridge connecting piece, two ends of the bridge connecting piece are respectively pivoted to the front connecting piece and the rear connecting piece, the bottom end of the front connecting piece is pivoted to the arm frame, the bottom end of the rear connecting piece is pivoted to the arm frame.

Compared to the existing known technology, the technical proposal of the present invention has advantages as follows:

1. Before the sofa bed leaves the factory, the arm fames are fixedly connected to the linking mechanism; when assembling, the top end of the front connecting piece is pivoted to the mattress frame, the top end of the rear connecting piece is pivoted to the back frame. The linking mechanism comprises a front connecting piece, rear connecting piece and a bridge connecting piece, the components quantity is fewer, the structure is simple, the cost can be reduced at least 10%, also reduced is the weight.
2. The thickness of the linking mechanism is thin, before the sofa bed leaves the factory, the linking mechanism is fixed to the arm frames, not influencing the integral package. When assembling, the top end of the front connecting piece is pivoted to the mattress frame, the top end of the rear connecting piece is pivoted to the back frame, the assembling steps are fewer, making the assembling conveniently. The screw quantity of the sofa bed is efficiently reduced, further reduced is the cost and the weight. 2.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Referring toFIGS. 1-5, the sofa bed of the present invention comprises a mattress frame10, a back frame20, two arm frames30and two cross beams40. Two arm frames30are connected by the two cross beams40. The mattress frame10and the back frame20are rotatably pivoted by at least one pair of rotating hinges50. The inner side of the arm frame30is disposed with a linking mechanism, the linking mechanism comprises a front connecting piece31, rear connecting piece32and a bridge connecting piece33, two ends of the bridge connecting piece33are respectively pivoted to the front connecting piece31and the rear connecting piece32, the bottom end of the front connecting piece31is pivoted to the arm frame30, the bottom end of the rear connecting piece32is pivoted to the arm frame30. Before the sofa bed leaves the factory, the arm fames30are fixedly connected to the linking mechanism, therefore, the consumer needn't to assemble the arm frames and the linking mechanism; when assembling, the top end of the front connecting piece31is pivoted to the mattress frame10, the top end of the rear connecting piece32is pivoted to the back frame20. The installation steps are fewer, and the assembling is fast. The mattress frame10and the back frame20are pivoted by at least a pair of rotating hinges50. The rotating hinges50pull the mattress frame and the back frame at the same time, thus improving the strength of the sofa bed.

connecting piece31is riveted to the arm frame30. The bottom end of the rear connecting piece32is riveted to the arm frame30. It reduces the utility quantity of the bolts by riveting method, thus reducing the cost and the weight.

The top end of the front connecting piece31is pivoted to the mattress frame10by bolt, the top end of the rear connecting piece32is pivoted to the back frame20by bolt. The linking mechanism is connected to the mattress frame10and the back frame20respectively just by a bolt, making the assembly easy. Or in another case, The top end of the front connecting piece31is pivoted to the mattress frame10by pin, the top end of the rear connecting piece32is pivoted to the back frame20by pin. And the end portion of the pin is disposed with a clamp spring to prevent the pin from dropping out. Preferred, the top end of the front connecting piece31is detachably pivoted to the mattress frame10, the top end of the rear connecting piece32is detachably pivoted to the back frame20.

Preferred, before the sofa bed leaves the factory, the mattress frame10and the back frame20are connected to an integral one by the rotating hinge50. The mattress frame10and the back frame rotate relatively, but they do not separate from each other. Therefore, the rigidity of the mattress frame10and the back frame20is well, and the assembly steps are reduced.

The rotating hinges50of each pair are riveted to form an integral one. Or in another case, the rotating hinges50of each pair are connected by a bolt to form an integral one.

The rotating hinge isshaped. The rotating hinges50of each pair are respectively disposed at the cross beam12at the inner side of the mattress frame10and the cross beam22at the inner side of the back frame20. preferred, the sofa bed comprises four pairs of rotating hinges50, two of them are respectively near to the two arm frames20, while the other two are disposed at the central portion of the cross beam; one end of the rotating hinge50is fixedly connected to the cross beam.