Foldable sofa bed

Abstract

The utility model discloses a foldable sofa bed. The foldable sofa bed comprises: a sofa seat; the stretching mechanism is assembled on the sofa seat, and the stretching mechanism can move forwards or backwards relative to the sofa seat, so that the sofa bed is switched between a bed state and a seat state; the locking mechanism is arranged on the stretching mechanism and can move along with the stretching mechanism; and when the sofa bed is switched from the seat state to the sofa state, the locking mechanism can lock the stretching mechanism. According to the sofa bed, the locking mechanism moves along with the stretching mechanism, so that the locking mechanism can lock the stretching mechanism when the sofa bed is switched from a seat state to a sofa state, the sofa bed is locked in a bed state, and the influence of the outside on the sofa bed is reduced; the safety and the stability of the sofa bed are effectively improved, so that the use experience of a user is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of furniture, in particular to a foldable sofa bed. BACKGROUND

[0002] With the acceleration of social development and the continuous increase of population, the limitedness of living space is more obvious. Most families will purchase a sofa bed, which can be used as a sofa seat during the day and converted into a bed at night. This not only saves expenses, but also reduces space occupation and increases space utilization. There are various sofa beds on the market now, and the switching methods are also various, such as folding type, turnover type and stretching type.

[0003] However, when the sofa bed is switched to the bed state, it is easy to be disturbed by external factors during use, such as slight vibration, accidental touch or pet activity, which may cause the state to change spontaneously. Such sudden changes not only may break the user's original life rhythm, but more importantly, they hide serious safety hazards. For example, if the sofa bed state changes during sleep at night, the user may fall in sleep, causing physical injury. These potential risks seriously threaten the user's personal safety and greatly reduce the user's use experience, making the user feel uneasy and inconvenient. CONTENT OF THE INVENTION

[0004] In order to overcome at least one of the defects of the prior art described above, the present application provides a foldable sofa bed which can lock the sofa bed in the bed state and improve the safety and stability of the sofa bed.

[0005] According to the foldable sofa bed of the present application, the sofa bed comprises a sofa seat, an extension mechanism assembled on the sofa seat and capable of moving forward or backward relative to the sofa seat to switch the sofa bed between the bed state and the seat state, and a locking mechanism arranged on the extension mechanism and capable of moving with the extension mechanism. The locking mechanism can lock the extension mechanism when the sofa bed is switched from the seat state to the bed state.

[0006] In the foldable sofa bed, the locking mechanism moves with the extension mechanism to lock the extension mechanism when the sofa bed is switched from the seat state to the bed state, so as to lock the sofa bed in the bed state, reduce the influence of the external environment on the sofa bed, effectively improve the safety and stability of the sofa bed, and thus optimize the use experience of the user.

[0007] According to some embodiments of the present application, the stretching mechanism comprises a first mounting frame for assembling a first seat cushion, a second mounting frame for assembling a second seat cushion, a third mounting frame for connecting the sofa seat, and a linkage assembly; the third mounting frame is pivotally connected to the linkage assembly; one end of the linkage assembly is hingedly connected to the first mounting frame, the other end of the linkage assembly is hingedly connected to the second mounting frame, and when the first mounting frame moves forward or backward, the second mounting frame can be driven to lift or drop by the linkage assembly, so that the second seat cushion is flush with or accommodated under the first seat cushion; the locking mechanism is arranged on the first mounting frame and can move with the first mounting frame, and when the second seat cushion is flush with the first seat cushion, the locking mechanism can drive the first mounting frame and the linkage assembly to lock each other.

[0008] According to some embodiments of the present application, the linkage assembly comprises a first connecting rod and a second connecting rod arranged in a crank shape; one end of the first connecting rod is hingedly connected to the front end of the first mounting frame, the other end of the first connecting rod is hingedly connected to the front end of the second mounting frame; one end of the second connecting rod is hingedly connected to the rear end of the first mounting frame, the other end of the second connecting rod is hingedly connected to the rear end of the second mounting frame; the front end of the third mounting frame is hingedly connected to the first connecting rod, and the rear end of the third mounting frame is hingedly connected to the second connecting rod.

[0009] According to some embodiments of the present application, further comprising a first elastic member arranged between the first connecting rod and the second connecting rod.

[0010] According to some embodiments of the present application, the locking mechanism comprises a lock catch and a lock post, the lock catch is pivotally connected to the first mounting frame, and the lock post is arranged on the first connecting rod; when the sofa bed is in the bed state, the lock catch is clamped with the lock post.

[0011] According to some embodiments of the present application, further comprising a second elastic member arranged between the lock catch and the first mounting frame, for driving the lock catch to keep closed or open state.

[0012] According to some embodiments of the present application, further comprising a first guide edge arranged at the front end of the lock catch, for abutting against the lock post when the first mounting frame moves forward, and the abutting of the first guide edge and the lock post will drive the lock catch to rotate, so that the lock post is clamped with the lock catch.

[0013] According to some embodiments of the present application, the second connecting rod is provided with the reset post, and the rear end of the lock catch is provided with a second guide edge; when the first mounting frame moves backward, the reset post can abut against the second guide edge, and the abutting of the reset post and the second guide edge will drive the lock catch to rotate downward.

[0014] According to some embodiments of the present application, a pulling part is arranged on the lock catch, and is used for opening the lock catch.

[0015] According to some embodiments of the present application, a limiting slot is arranged on one end of the first mounting frame, and a limiting column is arranged in the limiting slot and fixedly connected with the first mounting frame.

[0016] In summary, the foldable sofa bed provided by the present application has the following technical effects:

[0017] The locking mechanism moves along with the stretching mechanism, so that the locking mechanism can lock the stretching mechanism when the sofa bed is switched from the seat state to the sofa state, and the sofa bed is locked in the bed state, thereby reducing the influence of the outside world on the sofa bed, effectively improving the safety and stability of the sofa bed, and optimizing the use experience of the user. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic view of a foldable sofa bed according to an embodiment of the present application;

[0019] Figure 2 FIG. 3 is a structural schematic view of a foldable sofa bed in a bed state according to an embodiment of the present application;

[0020] Figure 3 FIG. 5 is a structural schematic view of a foldable sofa bed in a seat state according to an embodiment of the present application;

[0021] Figure 4 FIG. 7 is a structural schematic view of a stretching mechanism according to an embodiment of the present application;

[0022] Figure 5 FIG. 9 is a structural schematic view of a stretching mechanism switched from a seat state to a bed state according to an embodiment of the present application;

[0023] Figure 6 FIG. 11 is a structural schematic view of a stretching mechanism in a bed state according to an embodiment of the present application;

[0024] Figure 7 FIG. 13 is a structural schematic view of a stretching mechanism switched from a bed state to a seat state according to an embodiment of the present application;

[0025] Figure 8 FIG. 15 is a structural schematic view of a stretching mechanism in a seat state according to an embodiment of the present application.

[0026] In the drawings, the reference signs have the following meanings:

[0027] 1, sofa seat; 11, first cushion; 12, second cushion; 2, extension mechanism; 21, first mounting frame; 22, second mounting frame; 23, third mounting frame; 24, linkage assembly; 241, first connecting rod; 2411, first branch arm; 2412, second branch arm; 242, second connecting rod; 2421, third branch arm; 2422, fourth branch arm; 243, first elastic member; 3, locking mechanism; 31, lock catch; 311, first guide edge; 312, second guide edge; 313, pull part; 314, limiting groove; 315, limiting column; 32, lock column; 33, reset column; 34, second elastic member. DETAILED DESCRIPTION

[0028] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present application.

[0029] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application.

[0031] Reference is made to Figure 1 , Figure 2 and Figure 3The application discloses a foldable sofa bed. The foldable sofa bed comprises a sofa seat 1, an extension mechanism 2 and a locking mechanism 3. In some embodiments, the extension mechanism 2 is assembled on the sofa seat 1, and the extension mechanism 2 can move forward or backward relative to the sofa seat 1 to switch the sofa bed between a bed state and a seat state. The locking mechanism 3 is arranged on the extension mechanism 2 and can move with the extension mechanism 2. When the sofa bed is switched from the seat state to the bed state, the locking mechanism 3 can lock the extension mechanism 2 to lock the sofa bed in the bed state or the seat state. Preferably, the locking mechanism 3 moves with the extension mechanism 2, so that the locking mechanism 3 can lock the extension mechanism 2 when the sofa bed is switched from the seat state to the bed state, the sofa bed is locked in the bed state, the influence of the external environment on the sofa bed is reduced, the safety and stability of the sofa bed are effectively improved, and the use experience of the user is optimized.

[0032] Referring to Figure 1 , Figure 2 and Figure 3In some embodiments, the stretching mechanism 2 comprises a first mounting frame 21 for assembling the first seat cushion 11, a second mounting frame 22 for assembling the second seat cushion 12, a third mounting frame 23 for connecting the sofa base 1, and a linkage assembly 24, the third mounting frame 23 is pivoted to the linkage assembly 24; one end of the linkage assembly 24 is hinged to the first mounting frame 21, the other end of the linkage assembly 24 is hinged to the second mounting frame 22, and when the first mounting frame 21 moves forward or backward, the second mounting frame 22 can be lifted or lowered by the linkage assembly 24 to make the second seat cushion 12 flush with the first seat cushion 11 or accommodated below the first seat cushion 11; the locking mechanism 3 is arranged on the first mounting frame 21 and can move with the first mounting frame 21, and when the second seat cushion 12 is flush with the first seat cushion 11, the locking mechanism 3 can lock the first mounting frame 21 and the linkage assembly 24. Optionally, when the first mounting frame 21 moves forward, the second mounting frame 22 can be rotated upward around the hinge point of the linkage assembly 24 and the third mounting frame 23 by the linkage assembly 24 to lift the second seat cushion 12 to a position flush with the first seat cushion 11; optionally, when the first mounting frame 21 moves backward, the second mounting frame 22 can be rotated downward around the hinge point of the linkage assembly 24 and the third mounting frame 23 by the linkage assembly 24 to accommodate the second seat cushion 12 below the first seat cushion 11, wherein when the second seat cushion 12 is flush with the first seat cushion 11, the sofa bed is in a bed state, and when the second seat cushion 12 is accommodated below the first seat cushion 11, the sofa is in a seat state; optionally, when the sofa bed switches from the seat state to the bed state, the locking mechanism 3 can move with the first mounting frame 21, and when the second seat cushion 12 is flush with the first seat cushion 11, the locking mechanism 3 can lock the first mounting frame 21 and the linkage assembly 24 to lock the linkage assembly 24, thereby limiting the movement of the linkage assembly 24 and locking the sofa bed in the bed state.

[0033] Further, to improve the stability of the sofa bed during state switching, the number of stretching mechanisms 2 can be one or more than two, referring to Figure 4 In the present embodiment, the number of stretching mechanisms 2 is two, and the two stretching mechanisms 2 are arranged on both sides of the internal space of the sofa base 1, and when the sofa bed is in the seat state, the first seat cushion 11 and the second seat cushion 12 are accommodated in the internal space of the sofa base 1, further, a connecting rod is arranged between the two stretching mechanisms 2 to ensure that the two stretching mechanisms 2 move synchronously.

[0034] Referring to Figure 5 , Figure 6 , Figure 7 and Figure 8In some embodiments, the linkage assembly 24 comprises a first linkage 241 and a second linkage 242 arranged in a crank configuration; one end of the first linkage 241 is hinged to the front end of the first mounting bracket 21, and the other end of the first linkage 241 is hinged to the front end of the second mounting bracket 22; one end of the second linkage 242 is hinged to the rear end of the first mounting bracket 21, and the other end of the second linkage 242 is hinged to the rear end of the second mounting bracket 22; the front end of the third mounting bracket 23 is hinged to the first linkage 241, and the rear end of the third mounting bracket 23 is hinged to the second linkage 242. Optionally, the first linkage 241 arranged in a crank configuration comprises a first arm 2411 and a second arm 2412, which are fixedly connected or integrally formed, and there is an included angle between the first arm 2411 and the second arm 2412; optionally, one end of the first arm 2411 is hinged to the front end of the first mounting bracket 21 at a hinge point A, the first arm 2411 is hinged to the front end of the third mounting bracket 23 at a hinge point B, one end of the second arm 2412 is hinged to the front end of the second mounting bracket 22 at a hinge point C, and the end of the second arm 2412 away from the second mounting bracket 22 is fixedly connected to the first arm 2411 at a connection point D, wherein the connection point D is located between the hinge point A and the hinge point B, or the connection point D is located on the side of the hinge point B away from the hinge point A; optionally, one end of the first arm 2411 is hinged to the front end of the first mounting bracket 21 at a hinge point A, the second arm 2412 is hinged to the front end of the third mounting bracket 23 at a hinge point B, one end of the second arm 2412 is hinged to the front end of the second mounting bracket 22 at a hinge point C, and the end of the first arm 2411 away from the first mounting bracket 21 is fixedly connected to the second arm 2412 at a connection point D, wherein the connection point D is located between the hinge point C and the hinge point B, or the connection point D is located on the side of the hinge point B away from the hinge point C.

[0035] Referring to Figure 5 and Figure 8The first connecting rod 241 is arranged in an "L" shape, one end of a first branch 2411 is hinged to the front end of the first mounting frame 21 at a hinge point A, the end of the first branch 2411 away from the first mounting frame 21 is hinged to the front end of the third mounting frame 23 at a hinge point B, one end of a second branch 2412 is hinged to the front end of the second mounting frame 22 at a hinge point C, the end of the second branch 2412 away from the second mounting frame 22 is fixedly connected to the first branch 2411 at a connection point D, and the connection point D coincides with the hinge point B. Correspondingly, the second connecting rod 242 arranged in a curved shape includes a third branch 2421 and a fourth branch 2422, the third branch 2421 and the fourth branch 2422 are fixedly connected or integrally formed, and there is an included angle between the third branch 2421 and the fourth branch 2422; optionally, one end of the third branch 2421 is hinged to the rear end of the first mounting frame 21 at a hinge point E, the third branch 2421 is hinged to the rear end of the third mounting frame 23 at a hinge point F, one end of the fourth branch 2422 is hinged to the rear end of the second mounting frame 22 at a hinge point G, and the end of the fourth branch 2422 away from the second mounting frame 22 is fixedly connected to the third branch 2421 at a connection point H, wherein the connection point H is located between the hinge point E and the hinge point F, or the connection point H is located on the side of the hinge point F away from the hinge point E; optionally, one end of the third branch 2421 is hinged to the rear end of the first mounting frame 21 at a hinge point E, the fourth branch 2422 is hinged to the rear end of the third mounting frame 23 at a hinge point F, one end of the fourth branch 2422 is hinged to the rear end of the second mounting frame 22 at a hinge point G, and the end of the third branch 2421 away from the first mounting frame 21 is fixedly connected to the fourth branch 2422 at a connection point H, wherein the connection point H is located between the hinge point G and the hinge point F, or the connection point H is located on the side of the hinge point F away from the hinge point G; see Figure 5 and Figure 8, the second connecting rod 242 is arranged in an "L" shape, one end of a third branch 2421 is hinged to the rear end of the first mounting frame 21 at a hinge point E, the end of the third branch 2421 away from the first mounting frame 21 is hinged to the rear end of the third mounting frame 23 at a hinge point F, one end of a fourth branch 2422 is hinged to the rear end of the second mounting frame 22 at a hinge point G, and the end of the fourth branch 2422 away from the second mounting frame 22 is fixedly connected to the first branch 2411 at a connection point H, which coincides with the hinge point F. Specifically, when the first mounting frame 21 moves forward, the first branch 2411 drives the second branch 2412 to rotate upward around the hinge point B, and the third branch 2421 drives the fourth branch 2422 to rotate upward around the hinge point F, so that the second mounting frame 22 is lifted upward, and the second seat cushion 12 is lifted to a position flush with the first seat cushion 11; when the first mounting frame 21 moves backward, the first branch 2411 drives the second branch 2412 to rotate downward around the hinge point B, and the third branch 2421 drives the fourth branch 2422 to rotate downward around the hinge point F, so that the second mounting frame 22 is lowered, and the second seat cushion 12 is accommodated below the first seat cushion 11.

[0036] In some embodiments, the front end of the first seat cushion 11 is provided with a support for abutting the ground. Optionally, when the sofa is in a seat state, the first seat cushion 11 and the second seat cushion 12 are stacked in the sofa seat 1 in the height direction and are supported and fixed by the sofa seat 1, when the first seat cushion 11 moves forward so that the sofa is in a bed state, the support provided at the front end of the first seat cushion 11 abuts the ground to support the front end of the first seat cushion 11, and drive the first seat cushion 11 and the second seat cushion 12 to be flush at the same height; optionally, the support can be a columnar structure; optionally, the end of the support close to the ground can be provided with a roller, so that the support abuts the ground through the roller to facilitate the support to move forward with the first seat cushion 11.

[0037] Referring to Figure 5 , Figure 6 , Figure 7 and Figure 8In some embodiments, a first elastic member 243 is further included and arranged between the first link 241 and the second link 242. Preferably, the first elastic member 243 is arranged between the first link 241 and the second link 242 so that the first elastic member 243 is deformed during the movement of the first link 241 and the second link 242 to provide a pulling force to the first link 241 and the second link 242, thereby providing a pulling force to assist in lifting the first seat cushion 11 when the sofa is in the bed state, and providing a buffering effect to the gravity of the first seat cushion 11 when the sofa is in the seat state. Optionally, the first elastic member 243 is arranged between the first supporting arm 2411 and the third supporting arm 2421. When the first mounting frame 21 moves forward, the first supporting arm 2411 rotates forward around the hinge point B, the third supporting arm 2421 rotates forward around the hinge point F, and the distance between the first supporting arm 2411 and the third supporting arm 2421 increases during the rotation, thereby driving the first elastic member 243 to elastically deform. In this way, the pulling force of the first elastic member 243 acting on the first supporting arm 2411 has a component to drive the first supporting arm 2411 to move backward, so that the pulling force of the first elastic member 243 at this time forms a pulling force to assist in lifting the first seat cushion 11. Correspondingly, when the first mounting frame 21 moves backward, the first supporting arm 2411 rotates backward around the hinge point B, the third supporting arm 2421 rotates backward around the hinge point F, and the distance between the first supporting arm 2411 and the third supporting arm 2421 increases during the rotation, thereby driving the first elastic member 243 to elastically deform. In this way, the pulling force of the first elastic member 243 acting on the third supporting arm 2421 has a component to drive the third supporting arm 2421 to move forward, so that the pulling force of the first elastic member 243 at this time provides a buffering effect to the gravity of the first seat cushion 11.

[0038] Referring to Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, the locking mechanism 3 includes a lock catch 31 and a lock post 32. The lock catch 31 is rotationally connected to the first mounting frame 21, and the lock post 32 is arranged on the first link 241. When the sofa bed is in the bed state, the lock catch 31 is clamped with the lock post 32. Optionally, the lock post 32 is fixedly connected to the first supporting arm 2411 of the first link 241. When the sofa bed is switched to the bed state, the lock catch 31 moves with the first mounting frame 21 and is connected with the lock post 32 to lock the first mounting frame 21 and the first link 241 with each other, thereby locking the stretching mechanism 2 to lock the sofa bed in the bed state.

[0039] Referring to Figure 5 , Figure 6、 Figure 7 and Figure 8 In some embodiments, a second elastic member 34 is arranged between the lock catch 31 and the first mounting frame 21 to drive the lock catch 31 to remain in the closed or open state. Optionally, the second elastic member 34 is fixedly connected between the lock catch 31 and the first mounting frame 21, and is pre-arranged to have a certain deformation amount, so that the second elastic member 34 continuously provides a pulling force to the lock catch 31. Further, there is a critical point such that the inertial force of the lock catch 31 and the pulling force of the second elastic member 34 acting on the lock catch 31 are in balance. When the lock catch 31 rotates downward and passes the critical point, the pulling force of the second elastic member 34 acting on the lock catch 31 has a component to drive the lock catch 31 to continue to rotate downward, so as to keep the lock catch 31 closed. In this way, reliable clamping of the lock catch 31 and the lock post 32 can be ensured, and the stability of the sofa bed in the bed state can be provided. Correspondingly, when the lock catch 31 rotates upward and passes the critical point, the pulling force of the second elastic member 34 acting on the lock catch 31 has a component to drive the lock catch 31 to continue to rotate upward, so as to keep the lock catch 31 open, prevent the lock catch 31 from being closed again during the process of switching the sofa bed from the bed state to the seat state, and improve the smoothness of state switching.

[0040] Referring to Figure 5 、 Figure 6 、 Figure 7 and Figure 8 In some embodiments, a first guide edge 311 is arranged at the front end of the lock catch 31 to abut against the lock post 32 when the first mounting frame 21 moves forward, and the abutment of the first guide edge 311 and the lock post 32 drives the lock catch 31 to rotate, so that the lock post 32 is clamped with the lock catch 31. Preferably, when the sofa bed is switched to the bed state, the first guide edge 311 abuts against the lock post 32, and the abutment of the first guide edge 311 and the lock post 32 drives the lock catch 31 to rotate, so that the lock post 32 can enter the lock catch 31, and then the lock post 32 is clamped with the lock catch 31 under the action of the pulling force of the second elastic member 34, thereby realizing automatic locking of the stretching mechanism 2.

[0041] Referring to Figure 5 、 Figure 6 、 Figure 7 and Figure 8In some embodiments, the second connecting rod 242 is provided with the reset column 33, and the rear end of the lock catch 31 is provided with a second guide edge 312. The reset column 33 can abut against the second guide edge 312 when the first mounting frame 21 moves backward, and the abutment between the reset column 33 and the second guide edge 312 drives the lock catch 31 to rotate downward. Preferably, when the sofa bed is switched to the seat state, the second guide edge 312 abuts against the reset column 33 to drive the lock catch 31 to rotate downward, so that the lock catch 31 is switched from the open state to the closed state, that is, the lock catch 31 is reset. Thus, when the first mounting frame 21 moves forward, the first guide edge 311 of the lock catch 31 can abut against the lock column 32 again, and the lock catch 31 is driven to rotate so that the lock column 32 is clamped with the lock catch 31.

[0042] Referring to Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, a pulling part 313 is further included, which is arranged on the lock catch 31 and used to open the lock catch 31. Optionally, the pulling part 313 and the lock catch 31 are two independent components, and the pulling part 313 is fixedly connected to the lock catch 31. Optionally, the pulling part 313 and the lock catch 31 are integrally formed, and the pulling part 313 protrudes outward from the outer surface of the lock catch 31 to facilitate the user to pull. Preferably, when the sofa bed needs to be switched, the user pulls the pulling part 313 to drive the lock catch 31 to rotate upward, so as to open the lock catch 31 and separate the lock catch 31 from the lock column 32.

[0043] Referring to Figure 1- Figure 8 , ​ , ​ and ​In some embodiments, the lock 31 is provided with a limiting slot 314 near one end of the first mounting frame 21, and a limiting post 315 is arranged in the limiting slot 314 and fixedly connected with the first mounting frame 21. Preferably, the limiting post 315 abuts against the end of the limiting slot 314 to limit the rotation range of the lock 31. In this embodiment, when the lock 31 rotates downward and passes the critical point, the pulling force of the second elastic member 34 acting on the lock 31 has a component to drive the lock 31 to continue rotating downward. At this time, the limiting post 315 abuts against the lower end of the limiting slot 314 to limit the downward rotation range of the lock 31, so as to ensure that the first guiding edge 311 of the lock 31 can abut against the lock post 32 again when the first mounting frame 21 moves forward. Correspondingly, when the lock 31 rotates upward and passes the critical point, the pulling force of the second elastic member 34 acting on the lock 31 has a component to drive the lock 31 to continue rotating upward. The limiting post 315 abuts against the upper end of the limiting slot 314 to limit the upward rotation range of the lock 31, so as to ensure that the second guiding edge 312 of the lock 31 can abut against the reset post 33 again when the first mounting frame 21 moves backward.

[0044] Referring to ​In some embodiments, when the sofa bed is switched from the bed state to the seat state, the pulling part 313 is pulled first to drive the lock catch 31 to rotate upward, and under the pulling force of the second elastic member 34 acting on the lock catch 31, the lock catch 31 remains open, so that the lock catch 31 is separated from the lock post 32, and then the first seat cushion 11 is pushed to move backward, and the first mounting frame 21 moves backward, the first supporting arm 2411 drives the second supporting arm 2412 to rotate downward around the hinge point B, the third supporting arm 2421 drives the fourth supporting arm 2422 to rotate downward around the hinge point F, so that the second mounting frame 22 is lowered to accommodate the second seat cushion 12 under the first seat cushion 11, and the second guide edge 312 abuts against the reset post 33 to drive the lock catch 31 to rotate downward, so that the lock catch 31 is switched from the open state to the closed state, that is, the lock catch 31 is reset, so that when the first mounting frame 21 moves forward, the first guide edge 311 of the lock catch 31 can abut against the lock post 32 again; when the sofa bed is switched from the seat state to the bed state, the first seat cushion 11 is pulled to move forward, and the first mounting frame 21 moves forward, the first supporting arm 2411 drives the second supporting arm 2412 to rotate upward around the hinge point B, the third supporting arm 2421 drives the fourth supporting arm 2422 to rotate upward around the hinge point F, so that the second mounting frame 22 is lifted upward to lift the second seat cushion 12 to a position flush with the first seat cushion 11, and the first guide edge 311 abuts against the lock post 32 to drive the lock catch 31 to rotate, so that the lock post 32 can enter the lock catch 31, and then under the pulling force of the second elastic member 34, the lock post 32 is clamped with the lock catch 31, so as to automatically lock the stretching mechanism 2 to lock the sofa bed in the bed state, reduce the influence of the outside on the sofa bed, effectively improve the safety and stability of the sofa bed, and thus optimize the user's experience.

[0045] The technical means disclosed in the application scheme is not limited to the technical means disclosed in the above embodiments, but also includes technical solutions composed of any combination of the above technical features. It should be noted that for those skilled in the art, without departing from the principles of the present application, some improvements and refinements can also be made, which are also considered within the protection scope of the present application.

Claims

1. A foldable sofa bed, characterized in that, The utility model relates to a sofa bed, which comprises: a sofa seat (1); an extension mechanism (2) mounted on the sofa seat (1) and capable of moving forward or backward relative to the sofa seat (1) to switch the sofa bed between a bed state and a seat state; a locking mechanism (3) provided on the extension mechanism (2) and capable of moving with the extension mechanism (2); the locking mechanism (3) is capable of locking the extension mechanism (2) when the sofa bed is switched from the seat state to the bed state.

2. The foldable sofa-bed according to claim 1, characterized in that: The extension mechanism (2) comprises a first mounting frame (21) for mounting a first seat cushion (11), a second mounting frame (22) for mounting a second seat cushion (12), a third mounting frame (23) for connecting the sofa seat (1), and a linkage assembly (24); the third mounting frame (23) is pivotally connected to the linkage assembly (24); one end of the linkage assembly (24) is hingedly connected to the first mounting frame (21), and the other end of the linkage assembly (24) is hingedly connected to the second mounting frame (22), and when the first mounting frame (21) moves forward or backward, the second mounting frame (22) can be driven to lift or drop by the linkage assembly (24) to make the second seat cushion (12) flush with or accommodated under the first seat cushion (11); the locking mechanism (3) is provided on the first mounting frame (21) and capable of moving with the first mounting frame (21), and when the second seat cushion (12) is flush with the first seat cushion (11), the locking mechanism (3) can drive the first mounting frame (21) and the linkage assembly (24) to lock each other.

3. The foldable sofa-bed according to claim 2, characterized in that: The linkage assembly (24) comprises a first connecting rod (241) and a second connecting rod (242) arranged in a crank shape; one end of the first connecting rod (241) is hingedly connected to the front end of the first mounting frame (21), and the other end of the first connecting rod (241) is hingedly connected to the front end of the second mounting frame (22); one end of the second connecting rod (242) is hingedly connected to the rear end of the first mounting frame (21), and the other end of the second connecting rod (242) is hingedly connected to the rear end of the second mounting frame (22); the front end of the third mounting frame (23) is hingedly connected to the first connecting rod (241), and the rear end of the third mounting frame (23) is hingedly connected to the second connecting rod (242).

4. The foldable sofa-bed according to claim 3, characterized in that: Further comprising a first elastic member (243) provided between the first connecting rod (241) and the second connecting rod (242).

5. The foldable sofa-bed according to claim 3, characterized in that: The locking mechanism (3) comprises a lock catch (31) and a lock post (32), the lock catch (31) is rotationally connected to the first mounting frame (21), and the lock post (32) is provided on the first connecting rod (241); when the sofa bed is in the bed state, the lock catch (31) is clamped with the lock post (32).

6. The foldable sofa-bed according to claim 5, characterized in that: The second elastic member (34) is arranged between the lock catch (31) and the first mounting frame (21) and is used to drive the lock catch (31) to keep closed or open.

7. The foldable sofa-bed according to claim 6, characterized in that: The first guide edge (311) is arranged at the front end of the lock catch (31) and is used to abut against the lock post (32) when the first mounting frame (21) moves forward, and the abutment of the first guide edge (311) and the lock post (32) drives the lock catch (31) to rotate, so that the lock post (32) is clamped with the lock catch (31).

8. The foldable sofa-bed according to claim 6, characterized in that: The second connecting rod (242) is provided with the reset post (33), and the rear end of the lock catch (31) is provided with a second guide edge (312); The reset post (33) can abut against the second guide edge (312) when the first mounting frame (21) moves backward, and the abutment of the reset post (33) and the second guide edge (312) drives the lock catch (31) to rotate downward.

9. The foldable sofa-bed according to claim 5, characterized in that: The pull part (313) is arranged on the lock catch (31) and is used to open the lock catch (31).

10. The foldable sofa-bed according to claim 5, characterized in that: The lock catch (31) is provided with a limiting groove (314) at one end close to the first mounting frame (21), the limiting groove (314) is provided with a limiting post (315), and the limiting post (315) is fixedly connected with the first mounting frame (21).

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