Sofa bed and its open-close mechanism

Abstract

Divan bed comprising an almost parallelepiped frame structure, a plurality of movable frames, each constrained and movable according to roto-translative motions from a closing to an opening position, wherein said frames in the closing position are sequentially folded one over the other, and in the opening position, are consecutively aligned, and a mechanism able to move said frames characterized in that the mechanism comprises at least one lever, hinged in the node between the frame ( 2 ), a headrest, and the adjacent frame ( 3 ). In this way, undesired closure of the divan bed cannot occur.

1 ) Mechanism for sofa bed and similar products, comprising a number of articulated quadrilaterals and synchronization tools, with at least one lever having an end hinged to the joint ( 2 ′) between the frame ( 2 ), the headrest, and the adjacent frame ( 3 ); and characterized by the fact that said mechanism comprises a quadrilateral ( 16 ), a quadrilateral ( 12 ) and a quadrilateral ( 17 ).  
   
   
       2 ) Mechanism according to claims  1 , characterized by the fact that a first retain elastic mean is interposed between the lever ( 6 ) and the lever ( 1 ), while between the lever ( 1 ) and the fixed structure ( 7 ) is interposed a second retain elastic mean.  
   
   
       3 ) Mechanism according to  claim 2 , characterized by the fact that said elastic means can also be positioned on the elements bound to elements ( 6 ), ( 2 ) and ( 7 ).  
   
   
       4 ) Mechanism according to  claim 1 , characterized by the fact that said quadrilateral ( 12 ) determines the position of the headrest ( 2 ) in the bed configuration, being the headrest in vertical position in the sofa configuration.  
   
   
       5 ) Mechanism according to  claim 1 , characterized by the fact that the lifting can be obtained by means of two simple quadrilaterals; said quadrilaterals have one end hinged at the fixed structure ( 7 ), the other end at the frame ( 2 ) and are joined each other by means of a lever, which makes synchronous their motion.  
   
   
       6 ) Mechanism according to  claim 1 , characterized by the fact that said quadrilateral ( 16 ) moves synchronically the rest of the mechanism.  
   
   
       7 ) Mechanism according to  claim 6 , characterized by the fact that said quadrilateral ( 16 ) comprises a 5-hole lever ( 6 ), hinged to the levers ( 8 ) and ( 9 ), having roto-translative motion.  
   
   
       8 ) Mechanism according to  claim 6 , characterized by the fact that said quadrilateral ( 16 ) comprises a 4-hole lever ( 6 ), directly hinged to the fixed structure ( 7 ), with rotatory motion around a point fixed with resect to the fixed structure ( 7 )-  
   
   
       9 ) Mechanism according to  claim 1 , characterized by the fact that said mechanism performs a particular path, which raises the mechanism to a height above the ground that makes the mechanism manageable.  
   
   
       10 ) Mechanism according to  claim 1 , characterized by the fact that said quadrilateral ( 17 ) moves the sliding system of the seat cushions ( 21 ).  
   
   
       11 ) Mechanism according to the  claim 10 , characterized by the fact that said quadrilateral ( 17 ) moves the seat cushion ( 21 ) by means of only two additional elements ( 4 ) and ( 5 ).  
   
   
       12 ) Mechanism according to  claim 11 , characterized by the fact that said lever ( 4 ) has at least three holes, one of them hinges a frame, upon which the seat cushions ( 21 ) are placed.  
   
   
       13 ) Sofa bed comprising an almost parallelepiped frame structure; a number of movable frames, bound together, that move according to roto-translating motions from the close to open position, wherein in the closing position said frames are sequentially folded up, while in the open position, are consecutively aligned, characterized in that it uses a mechanism according to  claim 1.