CN207100999U - A kind of sofa-bed structure - Google Patents

Abstract

The utility model discloses a sofa bed structure, which comprises a cushion body arranged horizontally. An armrest is vertically fixedly installed on the left and right sides of the cushion body respectively. A backrest is arranged on the rear side of the cushion body. The backrest The lower surface is arranged above the upper surface of the cushion body, and also includes a bracket vertically arranged on the rear side of the backrest, the lower end of the bracket is fixedly connected to the rear end of the cushion body, and it is characterized in that the upper end of the bracket passes through The rotating mechanism is rotatably connected with the upper end of the backrest, and the upper end of the backrest can rotate along the rotating mechanism of the backrest to make the backrest rotate to a horizontal state. The sofa bed structure can better realize the conversion between the sofa and the sofa bed structure, and can satisfy people's requirements for the sofa and the bed at the same time after the conversion.

Description

A sofa bed structure

technical field

The utility model relates to the technical field of furniture, in particular to a sofa bed structure.

Background technique

There are usually two large pieces of furniture, sofas and beds, in the home, but these two pieces of furniture take up a lot of space. For small-sized households, setting up sofas and beds will make the originally small space more crowded, and it will give people more space. Life causes great troubles; when there are guests visiting at home, if you need accommodation, when there are not enough beds at home, it is also rude to let guests sleep on the sofa, etc. These situations will cause inconvenience.

A flip-type multifunctional sofa bed disclosed in Chinese patent CN 202604221 U is characterized in that: it includes a lower bed body and an upper bed body, the lower bed body has an accommodating space for receiving the upper bed body, and the upper bed body and the lower bed body The body is reversibly pivoted. When the upper bed body is turned upward relative to the lower bed body, the upper bed body is located above the lower bed body to form a double-layer bed structure. When the upper bed body is turned downward relative to the lower bed body, the upper bed body The body is accommodated in the accommodating space to form a sofa structure.

This kind of flip-type multifunctional sofa bed can realize the combination of sofa and bed, reduce the space occupied by separate beds and sofas, and when necessary, turn the upper bed body relative to the lower bed body to form a double-layer bed structure, which is convenient to use. But there are also following defects: 1. When the upper bed body is turned over with respect to the lower bed body, turning over with the connecting hinge as the turning point will form a circle with the hub as the center and the width of the upper bed body as the radius, which takes up space If it is larger, it will cause greater difficulties in the implementation of the flip change; 2. In order to ensure the strength and safety performance of the upper bed body, the general quality is relatively large, and only two hinges are used as the flip point. If the lower bed body is not fixed, Then the lower bed body will move during the flipping process; 3. After the upper bed body is turned over to the lower bed body to form a bunk bed, a chamber that can accommodate the upper bed body is formed inside the lower bed body, which cannot continue to be used as a sofa. It can only be used as a bed body. When the sofa needs to be used, the upper bed body needs to be turned over into the cavity of the lower bed body. The operation is cumbersome and cannot meet the needs of the sofa and the bed at the same time.

Utility model content

Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the utility model is: how to provide a more simple structure that can realize the conversion between the sofa and the sofa bed, and can also satisfy people's requirements for the sofa and the bed after the conversion. The required sofa bed structure.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions: In this application, the direction is defined as the orientation standard of the sofa itself when the backrest is not rotated.

A sofa bed structure, comprising a cushion body arranged horizontally, an armrest is vertically fixedly installed on the left and right sides of the cushion body, a backrest is arranged on the rear side of the cushion body, and the lower surface of the backrest is arranged on the Above the upper surface of the cushion body, it also includes a bracket vertically arranged on the back side of the backrest, the lower end of the bracket is fixedly connected with the rear end of the cushion body, and it is characterized in that the upper end of the bracket is connected to the The upper end of the backrest is rotatably connected, and the upper end of the backrest can be rotated along the backrest rotating mechanism so that the backrest rotates to the position directly above the cushion body and is in a horizontal state.

In this technical solution, a cushion body, an armrest and a backrest are provided, and a bracket is provided on the back of the backrest, which is the simplest sofa structure. The upper side of the upper end surface can better realize the rotation of the backrest along the backrest rotation mechanism. When the backrest is rotated to a horizontal state along the backrest rotating mechanism, it is supported and fixed to form a bed body above the cushion body. The structure of the sofa bed has the advantages of simple structure, low cost of accessories and better realization of the structural transformation between the sofa and the sofa bed. the needs of the people.

As an optimization, the backrest rotation mechanism includes a rotating shaft arranged at the inner upper end of the backrest along the length direction of the backrest, the end of the rotating shaft is fixedly connected to the backrest, and the upper end of the bracket is positive A rotating shaft sliding hole is arranged on the rotating shaft, and the rotating shaft is rotatably installed in the rotating shaft sliding hole.

Like this, be provided with the rotating shaft that is installed in the backrest and the rotating shaft slide hole that is arranged on the support upper end, the rotating shaft can rotate along the rotating shaft sliding hole, when the backrest does not rotate, can play a supporting role to the backrest upper end, when the backrest rotates to the cushion body When in a parallel state, the backrest rotating mechanism can also support the backrest. At the same time, the simplest structure is used to realize the rotation of the backrest relative to the sofa, which can reduce the cost and facilitate maintenance and installation.

As an optimization, the bracket includes two vertically arranged support rods, the support rods are symmetrically arranged on the back side of the backrest, the lower ends of the support rods are fixedly connected with the rear end of the cushion body, and the upper ends are respectively provided with the Shaft sliding hole.

In this way, the bracket is set as two support rods symmetrically arranged on the back side of the backrest, and the force is uniform, and the structure of the support rods is simple, which can play a good supporting role and reduce the cost at the same time.

As an optimization, it also includes a support mechanism for supporting the backrest in a horizontal state, the upper end of the support mechanism acts on the backrest in the horizontal state, and the lower end is supported on the cushion body or the bracket; The first connecting rod and the second connecting rod between the support rod and the backrest, one end of the first connecting rod is rotatably connected with the supporting rod, and the other end of the first connecting rod is connected with the second connecting rod. One end of the connecting rod is rotatably connected, and the other end of the second connecting rod is rotatably connected with the back of the backrest. When the backrest rotates to a horizontal state, the first connecting rod and the second connecting rod rotate to The same straight line is used to support the backrest in a horizontal state, and further includes a link locking mechanism for locking the first link and the second link on the same line.

In this way, the support mechanism is provided to support the rotated backrest, so that the backrest remains horizontal and has a certain strength, which can meet people's requirements for the bed body. The support mechanism is arranged between the support rod and the backrest, and includes a first link and a second link that are rotatably connected, and the ends of the first link and the second link that are away from each other are respectively rotatably connected to the support rod and the back side of the backrest, when the backrest turns away from the support bar to a horizontal state, the first link and the second link can be rotated relatively to be on the same straight line, and the link locking mechanism is used to lock the first link and the second link The rotation angle of the second link is locked to prevent the relative rotation between the first link and the second link. At this time, the first link and the second link can better support the backrest in a horizontal state. The structure is simple and easy to operate. convenient.

As an optimization, the link locking mechanism includes a cylindrical member, and the cylindrical member is slidably sleeved on the outside of the first link and/or the second link, and also includes a The outer surface of the first connecting rod is an annular block-shaped stop ring, the diameter of the stop ring is larger than the diameter of the cylindrical member, and the stop ring is connected to the first connecting rod and the second connecting rod The distance of the points is less than the length of the cylindrical member.

In this way, the connecting rod locking mechanism is set as a cylindrical member that can slide on the first connecting rod and the second connecting rod. The first connecting rod is located at the lower end of the second connecting rod, so a limit stop is set on the first connecting rod. The ring prevents the cylindrical member from sliding downward under the force of gravity, causing the supporting member to fail. When the first connecting rod and the second connecting rod rotate to be on the same straight line, the cylindrical member is arranged at the joint of the first connecting rod and the second connecting rod to prevent the first connecting rod from rotating relative to the second connecting rod , the structure is simple, and at the same time, the function of locking the rotation angles of the first connecting rod and the second connecting rod can be realized.

As an optimization, a groove is provided on the side of the support rod facing the first connecting rod, and the end of the first connecting rod away from the second connecting rod is rotatably connected to the lower end of the groove, and the The first connecting rod can be rotatably embedded in the groove, and the rear side of the backrest is vertically provided with a slide groove facing the support rod, and the end of the second connecting rod away from the first connecting rod is slidable. fit in the chute, when the first connecting rod and the second connecting rod are on the same straight line, the end of the second connecting rod away from the first connecting rod and the end of the chute The upper end of the chute extends vertically upwards, the width of the chute is larger than the diameter of the cylindrical member, and the second connecting rod and the cylindrical member can be slidably embedded in the inside the chute.

In this way, the support rod is provided with a groove that can accommodate the first connecting rod, and the back of the backrest is provided with a slide groove that can accommodate the cylindrical member and the second connecting rod. When the backrest rotates toward the direction close to the support rod, the second One connecting rod can be embedded in the groove, and the second connecting rod can be embedded in the chute, so that the backrest can be perpendicular to the cushion body, and the backrest angle can be adjusted between 0 degrees and 90 degrees, which can better people Demand for different angles of the backrest.

As an optimization, a sofa bed structure further includes an auxiliary support part, the auxiliary support part includes two telescopic rods symmetrically arranged on both sides of the front end of the cushion body, and the lower ends of the telescopic rods are fixedly installed on the cushion body Above, the telescopic rod can extend upwards in the vertical direction so that the upper end of the telescopic rod is supported on the backrest in a horizontal state to assist in supporting the backrest.

In this way, an auxiliary support component is provided to further ensure the strength that the backrest in a horizontal state can bear. The auxiliary support part is set as a telescopic rod, and the two ends of the telescopic rod are respectively connected with the cushion body and the backrest in a horizontal state to play a supporting role, and when the auxiliary support part is not needed, the telescopic rod can also be contracted to reduce The occupied space is simple and the structure can further increase the strength and stability of the whole device.

As an optimization, it also includes telescopic guardrails arranged along the length direction of the backrest, the telescopic guardrails are symmetrically arranged at the upper and lower ends of the backrest, and the front side of the backrest is respectively provided with guardrail sliding holes facing the telescopic direction of the telescopic guardrails. The telescopic guardrail can slide through the sliding hole of the guardrail.

In this way, a telescopic guardrail is provided, and when the backrest is not rotated, the telescopic guardrail can be shortened inside the backrest; Elastic parts and sliding holes that allow the elastic parts to pass through can be respectively set at the telescopic parts of the telescopic guardrail. When the telescopic guardrail is pulled upwards away from the front side of the backrest, the elastic parts are inserted into the sliding holes to limit the expansion and contraction of the guardrail. .

To sum up, the sofa bed structure can better realize the conversion between sofa and sofa bed structures, and can meet people's requirements for sofa and bed at the same time after conversion.

Description of drawings

Fig. 1 is a structural schematic diagram of the sofa bed structure after the backrest is turned over.

Fig. 2 is a structural schematic diagram of the sofa bed structure before the backrest is turned over.

Fig. 3 is a structural schematic diagram of the support structure in the sofa bed structure.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

During specific implementation: as shown in Fig. 1 ~ Fig. 3, a kind of sofa bed structure comprises a cushion body 1 that is arranged horizontally, and the left and right sides of described cushion body are respectively vertically fixed with an armrest 2, and described cushion body 1 The rear side of the backrest 3 is provided with a backrest 3, and the lower surface of the backrest 3 is arranged above the upper surface of the cushion body 1, and also includes a support vertically arranged on the rear side of the backrest 3, and the lower end of the support is connected to the cushion body. 1. The rear end is fixedly connected. It is characterized in that the upper end of the bracket is rotatably connected with the upper end of the backrest 3 through the backrest rotation mechanism, and the upper end of the backrest 3 can rotate along the backrest rotation mechanism so that the backrest 3 rotates to the cushion body 1 Directly above and in a horizontal state, it also includes a support mechanism for supporting the backrest 3 in a horizontal state. The upper end of the support mechanism supports the backrest 3 in a horizontal state, and the lower end supports the cushion body or the bracket.

Like this, be provided with cushion body, armrest and backrest, backside is provided with bracket, is the simplest sofa structure, the upper end of backrest is connected with the upper end of support by backrest rotation mechanism, and the lower end surface of backrest is positioned at the upper end surface of cushion body side, the backrest can be better realized to rotate along the backrest rotation mechanism. When the backrest is rotated to a horizontal state along the backrest rotation mechanism, a bed body located above the cushion body will be formed. A support mechanism is provided to support the rotated backrest, so that the backrest remains horizontal and has a certain strength, which can satisfy people's expectations for the backrest. Bed requirements. The structure of the sofa bed has the advantages of simple structure, low cost of accessories and better realization of the structural transformation between the sofa and the sofa bed. the needs of the people.

In this specific embodiment, the backrest rotation mechanism includes a rotating shaft arranged at the inner upper end of the backrest 3 along the length direction of the backrest 3, the end of the rotating shaft is fixedly connected to the backrest 3, and the upper end of the bracket is along the The length direction of the backrest 3 is provided with a rotating shaft slide hole facing the rotating shaft, and the rotating shaft is rotatably installed in the rotating shaft sliding hole.

Like this, be provided with the rotating shaft that is installed in the backrest and the rotating shaft slide hole that is arranged on the support upper end, the rotating shaft can rotate along the rotating shaft sliding hole, when the backrest does not rotate, can play a supporting role to the backrest upper end, when the backrest rotates to the cushion body When in a parallel state, the backrest rotating mechanism can also support the backrest. At the same time, the simplest structure is used to realize the rotation of the backrest relative to the sofa, which can reduce the cost and facilitate maintenance and installation. Of course, in actual implementation, the backrest rotation mechanism may be a hinge mechanism arranged at the upper end of the bracket, which also belongs to the implementable range of the device.

In this specific embodiment, the bracket includes two vertically arranged support rods 4, the support rods 4 are symmetrically arranged on the rear side of the backrest 3, and the lower ends of the support rods 4 are fixed to the rear end of the cushion body 1. The upper ends are respectively provided with the sliding holes of the rotating shafts.

In this way, the bracket is set as two support rods symmetrically arranged on the back side of the backrest, and the force is uniform, and the structure of the support rods is simple, which can play a good supporting role and reduce the cost at the same time. Of course, in actual implementation, the bracket can be set to include two or more support rods, all of which belong to the implementable range of the device.

In this specific embodiment, the supporting mechanism includes a first connecting rod 7 and a second connecting rod 8 arranged between the supporting rod 4 and the backrest 3, one end of the first connecting rod 7 is connected to the The support rod 4 is rotatably connected, the other end of the first link 7 is rotatably connected to one end of the second link 8, and the other end of the second link 8 is rotatably connected to the rear side of the backrest 3, when When the backrest 3 is rotated to the horizontal state, the first connecting rod 7 and the second connecting rod 8 are rotated to the same straight line to support the backrest 3 in the horizontal state. A link locking mechanism in which the rod 7 and the second link 8 are locked on the same straight line.

In this way, the support mechanism is arranged between the support rod and the backrest, and includes a first link and a second link that are rotatably connected, and the ends of the first link and the second link that are away from each other are respectively rotatably connected to the The support rod and the back side of the backrest, when the backrest is turned away from the support rod to a horizontal state, the first link and the second link can be relatively rotated to be on the same straight line, and the link locking mechanism is used to lock the first link The rotation angle of the rod and the second connecting rod is locked to prevent the relative rotation of the first connecting rod and the second connecting rod. At this time, the first connecting rod and the second connecting rod can better support the backrest in a horizontal state, and the structure is simple , easy to operate. Of course, during specific implementation, the support mechanism can be set as a connecting rod with one end rotatably connected to the support rod, and the other end of the connecting rod is connected to the rear side of the backrest in a horizontal state to support the backrest, which also belongs to the implementation of this device. scope.

In this specific embodiment, the link locking mechanism includes a cylindrical member 81, and the cylindrical member 81 is slidably sleeved on the first connecting rod 7 and/or the second connecting rod 8. The outer side also includes an annular block-shaped stop ring 71 arranged on the outer surface of the first connecting rod 7, the diameter of the stop ring 71 is larger than the diameter of the cylindrical member 81, and the stop ring 71 reaches the first The distance between the connection point of the link and the second link is less than the length of the cylindrical member 81 .

In this way, the connecting rod locking mechanism is set as a cylindrical member that can slide on the first connecting rod and the second connecting rod. The first connecting rod is located at the lower end of the second connecting rod, so a limit stop is set on the first connecting rod. The ring prevents the cylindrical member from sliding downward under action, causing the supporting member to fail. When the first connecting rod and the second connecting rod rotate to be on the same straight line, the cylindrical member is arranged at the joint of the first connecting rod and the second connecting rod to prevent the first connecting rod from rotating relative to the second connecting rod , the structure is simple, and at the same time, the function of locking the rotation angles of the first connecting rod and the second connecting rod can be realized. Of course, during specific implementation, the link locking mechanism can be set as a rigid metal sheet fixedly connected to the upper and lower surfaces of the end of the second link close to the first link, and the rigid metal sheet is close to the end of the first link. One end is provided with a sliding hole. When the first connecting rod and the second connecting rod rotate to be on the same straight line, the protrusion provided on the first connecting rod cooperates with the sliding hole to prevent the second connecting rod from contacting the first connecting rod. The rotation between the rods also belongs to the implementable range of the device.

In this specific embodiment, the side of the support rod 3 facing the first connecting rod 7 is provided with a groove, and the end of the first connecting rod 7 far away from the second connecting rod 8 is in contact with the groove. The lower end of the backrest 3 is rotatably connected, the first connecting rod 7 can be rotatably embedded in the groove, the rear side of the backrest 3 is vertically provided with a slide groove facing the support rod 4, and the second connecting rod 8 is away from One end of the first connecting rod 7 is slidably fitted in the chute, and when the first connecting rod 7 and the second connecting rod 8 are on the same straight line, the second connecting rod 8 The end away from the first connecting rod 7 abuts against the lower end of the chute, the upper end of the chute extends vertically upwards, the width of the chute is greater than the diameter of the cylindrical member 81, the first The two connecting rods 8 and the cylindrical member 81 can be slidably embedded in the slide groove.

In this way, the support rod is provided with a groove that can accommodate the first connecting rod, and the back of the backrest is provided with a slide groove that can accommodate the cylindrical member and the second connecting rod. When the backrest rotates toward the direction close to the support rod, the second One connecting rod can be embedded in the groove, and the second connecting rod can be embedded in the chute, so that the backrest can be perpendicular to the cushion body, and the backrest angle can be adjusted between 0 degrees and 90 degrees, which can better people Demand for different angles of the backrest. Of course, during specific implementation, a cross bar perpendicular to the support rod can be provided at the top of the support rod, and the end of the cross bar near the backrest is provided with a backrest rotation mechanism, so that the first connecting rod and the second connecting rod can Rotating until fit provides an accommodating space, and the backrest angle can also be adjusted between 0° and 90°, which also belongs to the implementable scope of the device.

In this specific embodiment, a sofa bed structure further includes an auxiliary supporting part, and the auxiliary supporting part includes two telescopic rods 6 symmetrically arranged on both sides of the front end of the cushion body 3 respectively, and the lower ends of the telescopic rods 6 are fixed Installed on the cushion body 1 , the telescopic rod 6 can extend upwards in the vertical direction so that the upper end of the telescopic rod 6 is supported on the backrest 3 in a horizontal state to assist in supporting the backrest 3 .

In this way, an auxiliary support component is provided to further ensure the strength that the backrest in a horizontal state can bear. The auxiliary support part is set as a telescopic rod, and the two ends of the telescopic rod are respectively connected with the cushion body and the backrest in a horizontal state to play a supporting role, and when the auxiliary support part is not needed, the telescopic rod can also be contracted to reduce The occupied space is simple in structure, and the strength and stability of the whole device can be further increased; the telescopic rod can be obtained by using a hydraulic telescopic rod, a pneumatic telescopic cylinder or an electric push rod. Of course, during specific implementation, the axial telescopic mechanism can be set as an escalator, and the upper and lower ends of the escalator are respectively connected and arranged on the cushion body and the backrest, which also belongs to the applicable range of the device.

In this specific embodiment, it also includes telescopic guardrails 5 arranged along the length direction of the backrest 3, the telescopic guardrails 5 are symmetrically arranged at the upper and lower ends of the backrest 3, and the front side of the backrest 3 faces the telescopic guardrails 5. Guardrail sliding holes 51 are respectively provided in the telescopic directions, and the telescopic guardrail 5 can slide through the guardrail sliding holes 51 .

In this way, a telescopic guardrail is provided, and when the backrest is not rotated, the telescopic guardrail can be shortened inside the backrest; Elastic parts and sliding holes that allow the elastic parts to pass through can be respectively set at the telescopic parts of the telescopic guardrail. When the telescopic guardrail is pulled upwards away from the front side of the backrest, the elastic parts are inserted into the sliding holes to limit the expansion and contraction of the guardrail. . Of course, during specific implementation, the telescopic guardrail can be set to be fixedly installed on the upper side guardrail on the front side of the backrest, the lower end of the guardrail is fixedly connected on the front side of the backrest, and the upper end is bent toward the direction close to the backrest, which also belongs to the applicable range of the device.

Claims (8)

1. a kind of sofa-bed structure, including a horizontally disposed cushion body, it is respectively perpendicular at left and right sides of the cushion body solid Dingan County is equipped with a handrail, is provided with a backrest on rear side of the cushion body, the backrest lower surface is arranged at the cushion Above body upper surface, in addition to the support on rear side of the backrest is vertically provided at, the pedestal lower end and the cushion body rear end It is fixedly connected, it is characterised in that the pedestal upper end is rotatablely connected by backrest rotating mechanism and the backrest upper end, described to lean on Back end can rotate along the backrest rotating mechanism to be caused backrest to rotate to cushion body surface and is horizontal.

2. sofa-bed structure as claimed in claim 1, it is characterised in that the backrest rotating mechanism includes growing along the backrest Degree direction is arranged on the rotating shaft of the backrest inner upper end, and the end of the rotating shaft is fixedly connected on the backrest, the branch Rotating shaft described in backrest length direction face described in frame upper end edge is provided with rotating shaft slide opening, and the rotating shaft is rotatably arranged on described In rotating shaft slide opening.

3. sofa-bed structure as claimed in claim 2, it is characterised in that the support includes two vertically arranged supports Bar, the support bar are symmetricly set on rear side of the backrest, and the support bar lower end is fixedly connected with the cushion body rear end, on End is respectively arranged with the rotating shaft slide opening.

4. sofa-bed structure as claimed in claim 3, it is characterised in that also include being used to support the backrest to be horizontal Supporting mechanism, the upper end supporting role of the supporting mechanism on the backrest of horizontality, lower end be supported in cushion body or On support；The supporting mechanism includes the first connecting rod and second connecting rod being arranged between the support bar and the backrest, institute The one end and the support bar for stating first connecting rod are rotatablely connected, one end of the other end of the first connecting rod and the second connecting rod Rotation connection, the other end of the second connecting rod on rear side of the backrest with being rotatablely connected, when the backrest is rotated to horizontality When, the first connecting rod is turned to the backrest of support level state on same straight line with the second connecting rod, in addition to For the connecting-rod locking mechanism being locked in the first connecting rod and the second connecting rod on same straight line.

5. sofa-bed structure as claimed in claim 4, it is characterised in that the connecting-rod locking mechanism includes a tubular structure Part, the Cylinder shape constructional element are slidably socketed in the outside of the first connecting rod or the second connecting rod, in addition to are arranged on institute First connecting rod lateral surface and baffle ring block in a ring are stated, the diameter of the baffle ring is more than the diameter of the Cylinder shape constructional element, described Baffle ring is less than the length of the Cylinder shape constructional element to the distance of first connecting rod and second connecting rod tie point.

6. sofa-bed structure as claimed in claim 5, it is characterised in that the side of first connecting rod described in the support bar face Set fluted, the lower end of the one end of the first connecting rod away from the second connecting rod and the groove is rotatablely connected, and described the One connecting rod, which can rotate, to be embedded into the groove, and support bar described in face is vertically provided with chute on rear side of the backrest, described The one end of second connecting rod away from the first connecting rod slidably coordinates in the chute, when the first connecting rod and described When two connecting rods are located on the same line, the one end of the second connecting rod away from the first connecting rod and the lower end of the chute are supported Connect, the upper end of the chute extends straight up, and the width of the chute is more than the diameter of the Cylinder shape constructional element, and described second connects Bar and the Cylinder shape constructional element are slidably embedded into the chute.

7. sofa-bed structure as claimed in claim 1, it is characterised in that also including Auxiliary support part, the Auxiliary support Part includes two expansion links for being symmetrically arranged at the cushion body front end both sides, and the lower end of the expansion link is fixedly mounted On the cushion body, the expansion link can vertically upwardly extend so that the upper end of the expansion link be supported on it is horizontal To backrest described in Auxiliary support on the backrest of state.

8. sofa-bed structure as claimed in claim 1, it is characterised in that also include stretching along what the backrest length direction was set Contracting guardrail, the Telescopic guardrail are symmetricly set on the backrest upper and lower ends, Telescopic guardrail described in the backrest leading flank face Telescopic direction is respectively arranged with guardrail slide opening, and the Telescopic guardrail slidably passes through the guardrail slide opening.