WO2003049579A1

WO2003049579A1 - Simplified mechanism sofa bed

Info

Publication number: WO2003049579A1
Application number: PCT/EP2002/013976
Authority: WO
Inventors: Dionisio Baldassarra
Original assignee: Comodo Italia S.R.L.
Priority date: 2001-12-12
Filing date: 2002-12-10
Publication date: 2003-06-19
Also published as: ITMI20012613A1; AU2002358651A1

Abstract

The simplified mechanism sofa bed comprises: a fixed structure that bears multiple frames hinged together, an extraction mechanism for at least the first frame from a housing inside said fixed structure, a flip-back mechanism of at least a second and a third frame in relation to the first frame, and at least one synchronising mechanism between the extraction and flip-back mechanism movements. At least said flip-back mechanism presents all couplings on or under the surface of said bed.

Description

SIMPLIFIED MECHANISM SOFA BED

DESCRIPTION

The present • invention concerns a sofa bed with a simplified conversion mechanism.

It is a well known fact that sofa beds currently in existence comprise a fixed structure that supports multiple frames (generally three or four) that fold away for insertion inside the fixed structure to assume the sofa form, or that are extended in pull-out position to form a bed.

Traditional sofa beds normally comprise at least two separate mechanisms necessary to extract and then to extend the frames from the fixed structure, to form the bed version.

However, sofa beds with this type of system present considerable problems in that the user must perform at least two different actions to open or close the structure to form the sofa or bed.

To resolve this problem various sofa bed action mechanisms have been developed for extraction and extension, including a bar for action synchronisation, so that opening and closing action can be performed with a single operation by the user.

However, even these sofa bed versions present certain problems, mainly because of the fact that especially in the bed version, they have resulted as often being dangerous.

In fact, because of the traditional structure that envisages mechanisms with numerous hinge systems that open and close over the bed surface, when the sofa bed is open in bed version, there is a strong risk that pressure applied by the user can cause the leverage action, provoking injury. This is increased by the fact that the traditional type sofa bed is equipped with an auxiliary frame that supports the sofa seat cushions that can slip on one of the hinged bed frames .

Practically speaking, while the sofa bed is in sofa version, the auxiliary frame is slid outwards, at the same time, rotating the bed frames that are hinged together.

However, at least initially, since the bed frame rotation is reasonably limited, the main effect of the mechanism is that of sliding the auxiliary frame outwards bringing with it the seating cushions of the sofa. It is clear in this case that this frame can hit the user, especially on the legs, with the risk of injury.

Another serious problem linked with traditional type sofa beds is their limited stability; in fact, when the sofa bed is in open position, and the load is concentrated on the frame that is part of the fixed structure, the other frames (those that have been extended) fold in, even if the load is fairly light, and this too presents a danger risk.

Moreover, the traditional type sofa bed structure presents another problem due to the fact that the ratio between the useful length of the structure in bed position and the depth of the structure in sofa position is very small.

For example, in the case of current models on the market, this ratio is generally about of 1960/860 (that is: the bed structure length that can actually be used is 1960 mm and the fixed structure has a depth of 860 mm.) .

This ratio limits the maximum size of the useable bed area in traditional sofa bed structures.

Naturally the direct result is that the maximum bed length is limited by the depth of the fixed support frame. In fact in order to increase the length of the structure in the sofa configuration, it is not possible to increase the depth of the fixed support frame as required because the front facing, the rear panel, the arm rests and all the elements that compose the structure in sofa version are attached to the fixed frame and limit the size; at the same time, appearance and size aspects prevent any increase in the limits that have already been applied for the depth of the fixed sofa frame.

The technical objective that the present invention proposes is therefore to realize a sofa bed with a simplified mechanism that will permit the elimination of the technical problems associated with prior art models.

This technical objective and the aim of the present invention is to realize a sofa bed that is very safe, and that can be opened and closed to bed configuration, or opened and closed to sofa configuration with very limited danger risks for the user even if he is not aware of the structure operation mode.

Another aim of this invention is to create a sofa bed that is very stable and that does not present the danger risk of folding in when a load is concentrated on the frame that forms the fixed structure. Another aim of this invention is that of realizing a sofa bed that can be opened very easily and without any danger risk to persons or objects located behind the sofa because they are not visible before the opening of the sofa bed.

A further aim of this invention is to realize a sofa bed structure with a ratio between the useful length of the structure in bed version, and the depth of the structure in sofa configuration that is very high compared to that of traditional models.

For example, using a structure as embodied in this invention, it is possible to fold up a bed 2000 mm long inside a frame measuring 830 mm, or in a different version, for example, to fold away a bed with a length of 2060 mm in a frame measuring 860 mm in depth.

The technical objective as well as the other aims of the present invention are attained with the embodiment of a simplified mechanism for sofa beds comprising: a fixed structure that supports a multiple number of frames connected to each other, an extraction mechanism for at least a first frame from its housing within the said fixed structure, a flip-back mechanism for at least a second and a third frame in relation to the said first frame and at least one synchronising mechanism between the extraction and flip-back action mechanisms, characterised by the fact that at least said flip-back mechanism presents hinged systems that are all attached on or under the bed surface .

Other characteristics of the present invention will be defined as well in the claims that follow.

Further characteristics and advantages of the present invention will be made clearer with the description of a preferred but not exclusive embodiment of the simplified action sofa bed, of the structure and the opening method of the sofa bed according to the present invention, illustrated in an indicative but by no means limiting manner in the enclosed drawings in which:

- Figure 1 shows a side view of the raising method in a first embodiment of the sofa bed in the bed configuration according to the present invention;

- Figures 2 and 3 show two different opening/closing stages of the sofa shown in figure 1;

- Figure 4 shows the sofa bed illustrated in figure 1 in the sofa configuration;

- Figure 5 shows a detail of figure 4 ;

- Figures 6-10 each show a side view of the raising method in a different embodiment of the sofa bed as described in the present invention;

- Figure 11 shows a structure in bed configuration according to the present invention ;

- Figure 12 shows the structure illustrated in figure 11 during an initial closure stage from bed to sofa (or during the final opening stage from sofa to bed) ;

- Figure 13 shows the structure in figure 11 during a final closure stage from bed to sofa ( or during the initial opening stage from sofa to bed) ; - Figure 14 shows the structure of figure 11 in the sofa configuration; and

- Figure 15 shows an enlarged side view in raising position of the extraction mechanism of the structure shown in figure 11.

The figures 1-10 illustrate a simplified action sofa bed with the identification reference number 1, said action permits the opening and closure of the sofa bed transforming it from sofa to bed configuration or vice-versa with a single movement only and without having to remove the cushions. The sofa bed 1 comprises a fixed structure 2 that bears multiple frames 3, 4, 5, 6, hinged to each other, an extraction mechanism, 7, for at least a first frame 3 from the housing in the fixed structure 2, a flip-back mechanism 8 on at least a second and a third frame, 4 and 5, in reference to the first frame 3, and at least one synchronising mechanism 9 between the extraction 7 and flip-back 8 mechanism movements.

Advantageously the flip-back mechanism 8 presents a hinging system applied completely on or under the surface of the bed.

Moreover, synchronising mechanism 9 preferably has all its hinge systems applied on or under the surface of the bed as well. The sofa bed 1 comprises a pantograph support mechanism 10, connected to one end of the third frame 5 and to the flip-back mechanism 8, designed to support the end of the bed.

All hinges on the support mechanism 10 are mounted on or under the bed surface in a safe manner; support mechanism 10 bears the cushion connections 11 of the back rest of the said sofa, for example through an auxiliary frame 12 attached or bolted at right angles to the support mechanism 10, and in particular to a foot 13.

Moreover, on the support mechanism side the third frame 5 bears one or more permanent seating cushions 14 of the sofa.

Preferably, the sofa bed 1 includes a fourth frame or head 6, hinged to the first frame 3, and also coupled to the extraction mechanism 7 at point 15 located above the bed surface when the sofa bed is in bed configuration.

In particular, the flip-back mechanism 8 includes a first connecting rod 20, with one end that forms an angle and coupled in point 21, to the support mechanism 10, and another end that forms an angle and coupled in point 22, to an intermediate portion of the second frame 4, and in an end portion, connecting rod 20 is coupled in point 23, to an end of a second connecting rod that forms an angle 24.

The second connecting rod 24 has another right-angled end coupled in an intermediate position 25, to the first frame 3, in an end portion 26 at right angles to the synchronising mechanism 9.

The extraction mechanism 7 comprises a third connecting rod 30 with one end coupled in point 31 to the fixed frame 2, to an opposite end coupled in position 15, to the fourth frame or head 6 in a position higher than the bed surface when the sofa bed is in open or bed configuration. Moreover, the extraction mechanism 7 comprises a fourth connecting rod 32 with an end that forms an angle and with an intermediate position 33 coupled to fixed frame 2; an opposite end is coupled in an intermediate position 34 to the synchronising mechanism 9, and in a terminal position 35 to the first frame 3.

The third connecting rod 30 and said fourth connecting rod 32 are also connected by a fifth connecting rod 36 coupled in intermediate positions 37 and 38.

The pantograph support mechanism 101 comprises a sixth connecting rod 40 coupled at one end onto the third frame 5 in an intermediate position (at 21) to the flip-back mechanism 8, at the opposite end 41 to the end of a seventh connecting rod 42 that in turn has another end 43 coupled to a folded back end of the foot 13.

The support mechanism 10 also comprises an eighth connecting rod 44 with an end coupled at a point 96 of a plate 97 welded to the third frame 5, an intermediate portion 45 coupled to the seventh connecting rod 42, and an end 46 coupled to a ninth connecting rod 47 which at the other end 48 is coupled in an intermediate portion of foot 13.

In an initial embodiment the synchronising mechanism 9 comprises a connecting rod 50 folded back with an end, 26 coupled in the right angled end of the second connecting rod 24 and another end coupled in position 34 in the intermediate portion of the fourth connecting rod 32.

In a second embodiment shown in figure 6, the synchronising mechanism 9 comprises a connecting rod 60 with one end 61 coupled on the same axis on which the first connecting rod 20 is coupled to second frame 4, and another end coupled to the end of an eleventh connecting rod 62.

The eleventh connecting rod 62 is coupled in an intermediate position 63 to the first frame 3 and in another end 64 it is coupled to a twelfth connecting rod 65, which in turn is coupled to the fourth connecting rod 32 in point 34.

In a third embodiment shown in figure 7, the synchronising mechanism 9 comprises a thirteenth connecting rod 70 with one end coupled at point 71 to an intermediate portion of said first connecting rod and the opposite end is coupled in point 72 to the fourth connecting rod 32 in its final right-angled portion 73.

In a fourth embodiment, shown in figure 8 the synchronising mechanism 9 comprises a fourteenth connecting rod 80, with one end connected in point 81 to an intermediate portion of the second connecting rod 24, and the opposite end coupled in point 83 to the fourth connecting rod 32 in its final right-angled portion 84.

In a fifth embodiment, shown in figure 9 the synchronising mechanism 9 comprises a fifteenth connecting rod 90 with one end connected in point 91 to an intermediate portion of the second frame 4.

In particular, the articulation 91 is created on an additional piece 92 that is welded to and protrudes from frame 4 in an upward direction. The opposite end of connecting rod 90 is coupled in point 93 to the fourth connecting rod 32 in its final folded back portion 94.

In a sixth embodiment shown in figure 10, the extraction mechanism 7 comprises two connecting rods 101, 102 coupled together at point 103 approximately in the centre.

One end of the sixteenth connecting rod 101 is set to slide and rotate in a guide 104 of the first frame 3, and the other end is coupled directly in position 105 on an auxiliary frame 106 that is connected to slide on fixed structure 2.

One end of the seventeenth connecting rod 102 is directly coupled in point 107 on the first frame 3, while the other end is set to slide and rotate in a guide (not shown) attached to the fixed structure 2, or in another example, attached to the auxiliary frame 106.

Moreover one end of the synchronising connecting rod is coupled in an intermediate position to the second frame 4, and connected at the other end to the sliding rotating end of the sixteenth connecting rod 101.

The extraction device 7 also comprises a first tie rod 108 and a second tie rod 109 coupled on one hand to the fourth frame 6 and on the other to the uprights 110 attached to fixed structure 2.

The connecting rods 108 and 109 act as a guide for frame 6, maintaining it within the measurements of the fixed structure 2 when the sofa bed is open or closed, and they also provide stability when the sofa bed is in bed configuration.

To open the sofa bed converting it from sofa to bed position, the user must pull the vertical back rest cushions towards himself, continuing until all the mobile frames are aligned and the cushions 11, 14 are arranged underneath the bed surface .

On the other hand, to transform the sofa bed from bed to sofa position, the user must push on the end of the third frame 5, to close all the frames and replace them all in the housing inside the fixed structure 2 in a single operation.

The function of the simplified sofa bed mechanism according to the present invention is easy to understand from the descriptions and illustrations, and in particular, the basic function is described as follows:

When the sofa bed is in closed position as shown in figure 4, the user must pull cushions 11 towards himself in the direction shown by the arrow marked F, the flip-back mechanism 8 activates the rotation of the second and third frames 4 and 5, and at the same time, the synchronising mechanism 9 transmits the action to the extraction mechanism 7 that sends out the first frame 3 from the housing in the fixed structure 2 rotating the fourth frame, or head 6 so that all four frames 3, 4, 5, and 6 are aligned, converting the sofa bed from sofa position to bed position, with the cushions 11, 14 in close contact and pressed against each other.

The closing operation is activated in the opposite manner, starting with the bed by pushing the end of the bed in the direction shown by arrow G in figure 1.

The structure according to this invention results as being very stable because hinge 15 is positioned above and very close to hinge 100 between the fourth and the first frames 6 and 3 so that the equilibrium of the momentum can be obtained even for very intense vertical loads applied to the first frame .

Advantageously, during the opening and closing operations, the maximum height reached by the frames is very contained, remaining lower than 115 centimetres.

This results in excellent opening and closing control, even when the user is not very tall, because the position of the hands is low for the whole operation.

The synchronising mechanisms are designed so that the mechanism provokes the exit of the frames from the housing inside the fixed structure rising above the front covering facing with a height no lower than 280 millimetres.

Moreover, thanks to the pantograph system, the cushions do not need to be removed for opening and closing operations because they are positioned automatically under the bed surface .

The pantograph geometry also allows the ends of the horizontal cushions to be positioned under the vertical cushions, improving the appearance and functionality since no empty spaces are created between the horizontal and vertical cushions when people are seated on the sofa. Moreover, this system permits the horizontal cushions to be anchored directly onto the frame without their having to be moved forward in order to flip up the back rest, provoking interference with the user's legs when opening the sofa.

When the sofa is in bed configuration it is very stable because the levers form a structure similar to an isostatic beam, and the stability is ensured because of the vicinity of the hinges 15 and 100.

Figures 11-15 show the sofa bed structure identified comprehensively with the reference number 1A. .

Structure 1A comprises a fixed support 2A that forms a housing space for at least two frames connected to each other in a rotating manner; as in the case illustrated in the enclosed figures, these frames are generally four in number, and are identified with reference numbers 3A, 4A, 5A, 6A.

The frames comprise a first frame or head 3A designed to assume a vertical position when structure 1A is in sofa configuration and a horizontal position when the structure 1A is in bed configuration.

Structure 1A includes an extraction mechanism 7A for the frames 3A-6A from the housing space with the first and second connecting systems 8A and 9A between frames 3A and 4A and the fixed support 2A designed to activate a translation motion on the first frame or head 3A when the structure is converted from sofa to bed configuration, to move the first frame or head away from a rear portion of the structure, and then to activate a rotor translation to line up the first frame or head 3A with the other frames 4A-6A.

In particular, the first connecting systems 8 include the first connecting rods 10A-13A coupled between the fixed support 2A and the first frame or head 3A, or the second frame 4A, that in turn, is coupled to the first frame of head 3A.

On the other hand, the second connecting system 9A includes a second connecting rod coupled on one side to the fixed support 2A and on the other to a plate 18A that protrudes upwards from the first frame or head 3A when in bed configuration .

The first connecting rods 10A-13A are all coupled onto or under the bed surface when structure 1A is in bed configuration, but the second connecting rod has at least one coupling 19A above the bed surface when in bed configuration.

As shown in the enclosed figures, one of the first connecting rods, 10A has an "S" shape and is coupled between the fixed support 2A and the second frame 4A.

Moreover when structure 1A is in bed configuration, an intermediate concave portion of the same "S" shaped connecting rod 10A is coupled to one end of an intermediate connecting rod 11A, the opposite end being coupled to the end of an "L" shaped connecting rod 12A. In turn, this connecting rod 12A has one end coupled to the fixed support 2A.

Moreover, an intermediate angled portion of the "L" shaped connecting rod 12A is coupled to the end of connecting rod 13A also coupled to the first frame or head 3A. Advantageously, the "S" shaped connecting rod is coupled to a synchronising connecting rod 14A connected to a flip- back mechanism 15A, to permit the opening of the structure 1A with a single movement.

Appropriately, the second connecting rod 9A is always slanted towards the rear part of structure 1A, and when structure 1A is in bed configuration, the "L" shaped connecting rod 12A attains a height that is exactly equal to the distance between the lower portion and upper portion of the fixed support 2A, and the "S" shaped connecting rod 10A presents the portion included between a coupling attached to the fixed support 2A and a coupling attached to the intermediate connecting rod 11A, also exactly equal to the distance between the lower and upper portion of fixed support 2A.

Moreover, the end of connecting rod 13A is also always slanted towards the rear part of structure 1A.

The function of the sofa bed structure shown in figures 11-15 according to the present invention becomes very clear from the descriptions and the illustrations, and basically the function can be explained as follows:

When the bed is in sofa configuration (figure 14) the user must pull the cushions 20A towards himself as shown by the arrow F.

The flip-back mechanism 15A rotates the 5A, and 6A and at the same time, the synchronising connecting rod 14A transmits the motion action to the connecting rods 10A-13A of the first connecting systems 8A.

In this manner, the extraction mechanism 7A activates the exit action of the second frame 4A from the housing inside the fixed support 2A and activates the rotation of the first frame or head 3A so that all the four frames 3A-6A are aligned, thus converting the sofa bed from sofa version to bed version, with the cushions 20A, 21A in contact and pressed together.

Advantageously, when the structure is converted from sofa version to bed version, during the initial opening stage, the extraction mechanism 7A activates the first frame or head 3A so that it makes a translation motion only to move it away from the rear panel 23A of structure 1A, then during the second stage, it activates a rotor translation motion that aligns the frame with the other frames 4A-6A without hindering or interfering with the said rear panel 23A.

The extraction mechanism 7A also permits the frames to exit from the housing of the fixed support 2A rising above the front covering strip 24A that is reasonably high. Therefore, advantageously, it is possible to create front cover facings 24A that are extended as far as frames 4A-6A when the structure is in sofa version, so that no empty space is created between strip 24A and the seat cushions 21A.

Advantageously, the extraction mechanism 7A according to the present invention allows a bed with a length of 2000 mm to be folded inside a fixed support with a depth of 830 mm, or in a different version, a bed with a length of 2060 mm can be folded inside a fixed support of 860 mm.

Moreover, during the opening and closing operations, the maximum height reached by the frames is preferably lower than 115 centimetres; this provides excellent control for opening and closing operations of structure 1A even when the user is not very tall. .

The extraction mechanism 7A also permits improved weight distribution during opening and closing, limiting the pressure necessary to open and close the structure, providing improved control for the user.

Thanks to the pantograph end support mechanism 25A the cushions 20A and 21A do not need to be removed when structure 1A is opened, since these are automatically arranged under the bed surface formed by the aligned frames 3A-6A.

Moreover, the pantograph structure of the support mechanism 25A permits the ends of the seat cushions 21A to be lodged under the back rest cushions 20A.

This improves appearance and functionality because no empty spaces are created between the cushions 20A and 21A when people are seated on the sofa.

Advantageously, in bed configuration, the structure is much more stable because the connecting rods 9A and 13A prevent any rotation of the first frame or head 3A, and therefore, there is no danger that the user can be injured because the bed will not close when a load is applied to the area near hinge 26A between the first frame or head 3A and the second frame 4A. The present invention also concerns an opening method for a sofa bed comprising a fixed support 2A that includes a housing space for at least two frames (in the example illustrated, four frames 3A-6A) connected to each other in a rotating mode.

Frames 3A-6A comprise at least a first frame or head 3A,that assumes a vertical position when structure 1A is in sofa configuration, and a horizontal position when structure 1A is in bed configuration.

The method consists of translation of the first frame or head 3A to move it away from the rear portion of the structure 1A when in sofa configuration, and then to rotate and translate the first frame or head 3A at the same time so that it is aligned with the other frames 4A-6A.

Advantageously, this translation motion is oblique, and in particular, causes the first frame or head 3A to be raised and moved away from the rear portion of structure 1A at the same time.

Practically, it has been demonstrated how a sofa bed with a simplified movement according to this invention results as particularly advantageous because it is very safe, since the user runs no risk of injury when the sofa bed is in bed version because the hinges are arranged above the bed surface, or when the sofa bed is being opened because of the auxiliary frame that holds the seat cushions, nor from unexpected or accidental bed closure due to pressure applied on the first frame. Also advantageously, frames 3A-6A can exit from the housing in the fixed support without protruding further than the level established by the rear panel, and without banging against the front covering facing.

Another advantage is the fact that the opening and closing of the structure takes place in a single operation that is also very easily controlled thanks to the limited maximum height that the mechanism is permitted to attain.

The sofa bed, the opening method of a sofa bed as conceived in this invention can be modified and varied in numerous ways, all of which remain within the concept of this invention; moreover, all components can be replaced by other elements that are technically equivalent.

Practically speaking, the materials used, and their measurements could be of any type according to necessity and the state of the art.

Claims

1. Simplified action sofa bed comprising: a fixed structure that bears multiple frames hinged to each other, an extraction mechanism for at least a first frame from the housing in said fixed structure, a flip-back mechanism of at least a second and third frame with respect to the said first frame and at least one synchronising mechanism between the extraction mechanism and flip-back mechanism movements, characterised in that at least said flip-back mechanism presents all couplings on or under the surface of the bed.

2. Sofa bed according to claim 1, characterised in that at least one synchronising mechanism presents all couplings on or under the surface of the bed.

3. Sofa bed according to one or more of the previous claims, characterised in that it includes a support mechanism connected to one end of said third frame designed to form the support for the end of the bed when the sofa bed is in bed configuration.

4. Sofa bed according to one or more of the previous claims, characterised in that said support mechanism presents all couplings on or under the surface of the bed.

5. Sofa bed according to one or more of the previous claims characterised by the fact that said support mechanism has the back rest cushions of the sofa attached to it

6. Sofa bed according to one or more of the previous claims, characterised in that said third frame bears one or more seat cushions of said sofa permanently attached to the support mechanism.

7. Sofa bed according to one or more of the previous claims, characterised in that it includes at least a fourth frame or head hinged to said first frame, and also coupled to said extraction mechanism in a point above the surface of the bed when the sofa bed is in bed configuration.

8. Sofa bed according to one or more of the previous claims, characterised in that said flip-back mechanism includes a first connecting rod with one angled end coupled to said support mechanism, and another angled end and coupled to an intermediate portion of said second frame, and in a final portion coupled to the angled end of a second connecting rod, said second connecting rod having another end that forms a right angle coupled in an intermediate portion of said first frame and in a final portion coupled to said synchronising mechanism.

9. Sofa bed according to one or more of the previous claims, characterised in that said extraction mechanism includes a third connecting rod coupled to an end of said fixed frame, at the opposite end to said fourth frame or head in a position above the surface of the bed when the sofa bed is in open or bed configuration, a fourth connecting rod is coupled at an intermediate position to said fixed frame and an opposite end coupled in an intermediate position to said synchronising mechanism, and in an end position coupled to said first frame, said third connecting rod and said fourth connecting rod being also coupled by a fifth connecting rod in an intermediate position.

10. Sofa bed according to one or more of the previous claims, characterised in that said support mechanism comprises a sixth connecting rod that is coupled at one end to said third frame, and in an intermediate position, coupled to said flip-back mechanism, and at the opposite' end coupled to a seventh connecting rod whose other end is in turn coupled to the angled end of a foot, the support mechanism also comprises an eighth connecting rod and the final end is coupled to said third frame, an intermediate portion is coupled to said seventh connecting rod and a final end coupled to an eighth connecting rod with one end coupled to said third frame, an intermediate portion coupled to said seventh connecting rod and a final end coupled to the end of a ninth connecting rod that is coupled at the other end to an intermediate portion of the foot .

11. Sofa bed according to one or more of the previous claims, characterised in that said synchronising mechanism comprises an angled connecting rod with one end coupled to the right angled end of said second connecting rod, and another end coupled to an intermediate portion of a fourth connecting rod.

12. Sofa bed according to one or more of the previous claims, characterised in that said synchronising mechanism comprises a tenth connecting rod with one end coupled to the same axis on which are coupled said first connecting rod to said second frame, and at the other end coupled to the end of an eleventh connecting rod, this being coupled in an intermediate position to said first frame, and at the other end to a twelfth connecting rod coupled in turn to said fourth connecting rod.

13. Sofa bed according to one or more of the previous claims, characterised in that said synchronising mechanism comprises a thirteenth connecting rod with one end coupled to an intermediate portion of said first connecting rod and the opposite end coupled to said fourth connecting rod at the point of its right angled end.

14. Sofa bed according to one or more of the previous claims, characterised in that said synchronising mechanism comprises a fourteenth connecting rod with one end coupled to said second connecting rod in an intermediate point, and the opposite end coupled to the fourth connecting rod in the position of its right angled end.

15. Sofa bed according to one or more of the previous claims, characterised in that said synchronising mechanism comprises a fifteenth connecting rod with one end coupled to said second frame at an intermediate point, and an opposite end coupled to said fourth connecting rod in its final angled position.

16. Sofa bed according to one or more of the previous claims, characterised in that said extraction mechanism comprises two connecting rods coupled together, a sixteenth connecting rod presenting a sliding rotating end set in a guide of said first frame, and the other end coupled directly onto an auxiliary frame mounted to slide on the fixed structure, a seventeenth connecting rod having one end directly coupled to the first frame and the other end being mounted to slide and rotate in a guide attached to said fixed structure or to said auxiliary frame, moreover, since said second frame is coupled in an intermediate position to one end of the synchronising connecting rod connected at the opposite end to the sliding rotating end of said sixteenth connecting rod, the extraction device also includes a first tie rod and a second tie rod coupled on one hand to said fourth frame and on the other mounted in fixed position to the fixed structure

17. Simplified action sofa bed, characterised in that it comprises a fixed support that forms a housing space for at least two frames connected to each other with a rotating system, said frames comprising at least one first frame or head designed to assume a vertical position when said structure is in sofa configuration, and a horizontal position when said structure is in bed configuration, at least one extraction mechanism of said frames in said housing space having first and second connection means between said frames and said fixed support designed to activate a translation motion first to move said first frame or head away from the rear portion of the sofa bed, and then a rotor translation action to align said first frame or head with the other frames to convert the said structure from sofa version to bed version..

18. Sofa bed according to claim 17, characterised in that said first connection means comprise first connecting rods coupled between said fixed support and said first frame or head, or said second frame, that in turn is coupled to said first frame or head, said second connection means comprising at least one second connecting rod coupled on one hand to said fixed support and on the other to said first frame or head.

19. Sofa bed according to claims 17 or 18, characterised in that said first connecting rods are all coupled on or under said bed surface when the structure is in bed configuration .

20. Sofa bed according to one or more of the claims 17 to

19, characterised in that said second connecting rod has at least one coupling above the said bed surface when said structure is in bed configuration.

21. Sofa bed according to one or more of the claims 17 to

20, characterised in that when the structure is in bed configuration, one connecting rod of said first connecting rods is "S" shaped and coupled to said fixed support and said second frame, an intermediate concave portion of said "S" shaped connecting rod being coupled to the end of an intermediate connecting rod whose opposite end is coupled to the "L" shaped end of a connecting rod, whose other end is coupled to the fixed support, an angled intermediate portion of said "L" shaped connecting rod is coupled to the end of a rod also. coupled to said first frame or head.

22. Sofa bed according to one or more of the claims 17 to

21, characterised in that said "S" shaped connecting rod is coupled to a synchronising connecting rod connected to a flip-back mechanism to permit the opening action of the structure with a single movement .

23. Sofa bed according to one or more of the claims 17 to

22, characterised in that said second connecting rod is always slanted towards the rear part of the said structure .

24. Sofa bed according to one or more of the claims 17 to

23, characterised in that when said structure is in bed configuration, said "L" shaped connecting rod has the same height as the distance between the lower portion and upper portion of the fixed support, and said "S" shaped connecting rod presents the portion included between a coupling to the fixed structure and a coupling to the intermediate connecting rod also the same distance as that between the lower portion and upper portion of the fixed support .

25. Sofa bed according to one or more of the claims 17 to

24, characterised in that said end connection rod of said first connecting rods is always slanted towards the rear part of the said structure.