Sofa-Bed with Innovative Elements for Assembly and Position Adjustment

Abstract

Sofabed with innovative position adjustment mechanism and a fast assembly process, comprising padding elements, a base structure ( 1 ) a plurality of mutually hinged frames ( 2 ) supported by said base structure and supporting said padding elements, and a kinematic mechanism ( 3 ) to change the frames positions; moreover, the base structure comprises two identical elements, named “small legs” ( 4 ), a spacer ( 5 ), and is characterised by a “hinge” plate ( 6 ) consisting of two flat surfaces, fixed on the small leg ( 4 ), which consists of two flat surfaces with an almost rectangular hole ( 7 ); said hole is tapered on one side ( 8 ) to lodge the spacer ( 5 ). This assembly procedure removes the clearance in the coupling between the hinge ( 6 ) and the spacer ( 5 ) and obtains a perfect perpendicularity between the spacer and the “small leg” ( 4 ). According to a subsequent aim the base structure assembly is realised by only two bolts.

1 ) Sofa bed provided with an innovative position adjustment mechanism and a fast assembly process, comprising padding elements, a base structure ( 1 ) a mutually hinged number of frames ( 2 ), supported by said base structure and supporting said padding elements; and a kinematic mechanism ( 3 ) to change the frames positions; moreover, the base structure comprises two identical elements, named “small legs” ( 4 ), a spacer ( 5 ), and is characterised by a “hinge” plate ( 6 ), fixed on the small leg ( 4 ), which consists of two flat surfaces with an almost rectangular hole ( 7 ); said hole is tapered on one side ( 8 ) to lodge the spacer ( 5 ). 
   
   
       2 ) Sofa bed according to  claim 1 , wherein said spacer ( 5 ) is forced in the tapering ( 8 ) of the holes ( 7 ) by only one bolt. 
   
   
       3 ) Sofa bed according to  claim 1  or  2 , wherein said “hinge” plate has a pin ( 12 ), which allows the articulation of frame ( 10 ) around a hole ( 11 ) and the frame stop; said pin has an end ( 12 ′) engaged in the hole ( 11 ) of the frame ( 10 ), that works as a rotation axis, and a portion ( 12 ″) that works as a block element of the frame ( 10 ). 
   
   
       4 ) Sofa bed according to  claim 3 , wherein said pin ( 12 ) is forced by a return spring: loosing the spring tension, the pin is inserted in both holes of the two “hinge” plates ( 6 ); without using any tool and overcoming the spring preload, the frame ( 10 ) can be disengaged and fixed to another hole, obtaining a different inclination of the sofa back. 
   
   
       5 ) Sofa bed according to one of the claim from  1  to  4 , wherein, on the free end of the “small leg” ( 4 ), there is a roller ( 13 ) s which has a cross section complementary to the profile of a cam ( 14 ); being the mechanism in the sofa configuration, the two sections are each other engaged; said roller ( 13 ) is characterised by a central groove ( 13 ′), few millimetres wide, in which the cam is lodged. 
   
   
       6 ) Sofa bed according to one of the previous claims, wherein a front leg ( 15 ) can rotate around an axis up to a certain interval. 
   
   
       7 ) Sofa bed according to  claim 6 , wherein the desired position of said front leg ( 15 ) is realized by a further plate ( 16 ), fixed by a single bolt and having two block elements: the first one ( 18 ) realized on the leg, the second one realized on the cam. 
   
   
       8 ) Sofa bed according to  claim 7 , wherein said block elements can be realized by pins, either inserted in complementary holes or working on the external profile of the leg ( 15 ) or the cam ( 14 ). 
   
   
       9 ) Sofa bed according to  claim 7  or  8 , wherein said fixing plate ( 16 ) has a portion ( 20 ) at 90 degrees to the fixed one on the front leg ( 15 ), having a number of holes, to be used to fix the panels of different sofa models. 
   
   
       10 ) Sofa bed according to one of the previous claims, wherein it needs only 6 bolts for the whole assembly procedure. In fact, each structure side has 3 bolts: the first one to fix the spacer ( 5 ) to the “small leg” ( 4 ), the second to fix the cam ( 14 ) to the frame and the third one to fix the back leg ( 21 ) to the seat frame ( 2 ).