Connecting mechanism of elastic support unit and sofa bed frame thereof

Abstract

The utility model provides a kind of connecting mechanism of elastic support unit and its sofa bed frame.The connecting mechanism of this elastic support unit further includes connecting portion, the connecting portion inner end is connected with outer frame body, the connecting portion outer end protrudes outer frame body, and the connecting portion where protruding outer frame body has two transversely arranged connecting sections: connecting section one and connecting section two, the locating spring and bearing spring two are connected at connecting section two, and the connecting spring and bearing spring one are connected at connecting section one.The sofa bed frame includes elastic support unit one and elastic support unit two, the elastic support unit one inner end is connected with the elastic support unit two inner end and the both upper and lower flush, the elastic support unit two can overturn under the action of external force and make the support unit two after overturning and support unit one keep face contact.The connecting mechanism of this elastic support unit is high in stability, and the sofa bed frame occupies less space after being stored.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, specifically to a connection mechanism for an elastic support unit and its sofa bed frame. Background Technology

[0002] The sofa bed frame is the core supporting structure of a sofa bed, essentially its "skeleton." It determines the sofa bed's load-bearing capacity, durability, smoothness of opening and closing, and how it transforms from a "sofa" into a "bed."

[0003] To minimize space occupation during logistics, warehousing, and storage, sofa bed frames can adopt a folding structure. However, existing folding sofa bed frames simply hinge two identical elastic support units in a modular way. This not only makes it difficult to flip the frame at the hinge, but also results in a large height dimension of the folded sofa bed frame, occupying too much vertical space.

[0004] Chinese patent publication number CN202060348U provides a foldable movable bed frame, in which the steel mesh frame includes a steel mesh upper frame and a pressure-bearing frame. The pressure-bearing frame is evenly distributed on the wooden frame, and its lower end is fixed to the wooden frame by a hinge connection, and its upper end is fixed to the steel mesh upper frame by a hinge connection. The lower end of the support rod is fixed to the wooden frame by a hinge connection, and the positioning sleeve is fixed to the steel mesh upper frame. A limiting pin is provided at the upper end of the support rod, and the limiting pin is clearance-fitted with the inner hole of the positioning sleeve.

[0005] Because the steel mesh frame is changed from the existing fixed structure to a folding structure, when in use, the limiting pin of the support rod is inserted into the inner hole of the limiting sleeve to keep the pressure-bearing frame in a vertical state. During transportation, the limiting pin of the support rod is pulled out from the inner hole of the limiting sleeve to keep the pressure-bearing frame in a horizontal state.

[0006] It can be seen that, in the above patent, the two elastic support units still overlap when folded, which still results in the problem of occupying too much height space. Utility Model Content

[0007] The first objective of this invention is to address the aforementioned problems in existing technologies by providing a connection mechanism for a highly stable elastic support unit.

[0008] The second objective of this invention is to provide a sofa bed frame with a connecting mechanism having the aforementioned elastic support unit.

[0009] To achieve the first objective mentioned above, this utility model can be implemented through the following technical solutions:

[0010] A connecting mechanism for an elastic support unit, characterized in that,

[0011] The support unit 1 includes a bearing spring 1, a connecting plate, and a connecting spring. The bearing spring 1 is a helical spring. Several bearing springs 1 arranged laterally adjacent to each other form a bearing unit 1, and several bearing units 1 arranged longitudinally adjacent to each other form a bearing area 1. The connecting spring is helical and its outer diameter is smaller than that of the bearing spring 1. Several bearing springs 1 on the bearing unit 1 are evenly distributed along the length direction of the connecting spring. The connecting plate is arranged parallel to the bearing unit 1, and both the bearing spring 1 and the connecting spring are connected to the connecting plate.

[0012] In the connection mechanism of the elastic support unit described above, the upper part of the connecting plate has several protruding hooks along its length direction, the connecting spring is fastened to each hook, and the lower part of the partial bearing spring is fastened to the hook.

[0013] In the connection mechanism of the above-mentioned elastic support unit, there is a connecting spring between each two adjacent bearing units, and each bearing spring on the bearing unit is fastened to the connecting spring.

[0014] In the connection mechanism of the elastic support unit described above, both the upper and lower parts of the bearing area one have connecting springs.

[0015] In the above-mentioned connection mechanism of the elastic support unit, the elastic support unit one further includes a positioning frame one and a connecting frame one. The positioning frame one is U-shaped, and the inner end of the connecting frame one is connected to the bottom of the U-shape of the positioning frame one. The bearing spring one located at the outer end of the elastic support unit one is connected to the connecting frame one through the connecting spring.

[0016] In the connection mechanism of the above-mentioned elastic support unit, there are several connecting frames, which are evenly distributed along the width direction of the positioning frame. Each side of the connecting frame is connected to a corresponding bearing spring.

[0017] In the connection mechanism of the above-mentioned elastic support unit, the second elastic support unit includes an outer frame, a second load-bearing spring, and a positioning spring. There are two outer frames, which are arranged parallel to each other vertically. The second load-bearing spring is a serpentine spring, and its two ends are respectively connected to the corresponding outer frame. Several horizontally adjacent second load-bearing springs form a second load-bearing unit, and several vertically adjacent second load-bearing units form a second load-bearing area. The positioning spring is helical and connected to the outer frame. Several second load-bearing springs on the second load-bearing unit are evenly distributed along the length direction of the positioning spring and are connected to the positioning spring.

[0018] In the connection mechanism of the above-mentioned elastic support unit, the second elastic support unit further includes a second positioning frame and a second connecting frame. The second positioning frame is attached to the outer frame and its outer end extends out of the outer frame. The two ends of the second connecting frame are respectively connected to the second positioning frame and the outer frame.

[0019] In the connection mechanism of the above-mentioned elastic support unit, there are several connecting frames, and the several connecting frames are evenly distributed along the width direction of the positioning frame.

[0020] The connecting mechanism of the above-mentioned elastic support unit also includes a connecting part. The inner end of the connecting part is connected to the outer frame, and the outer end of the connecting part extends out of the outer frame. The connecting part extending out of the outer frame has two horizontally arranged connecting sections: connecting section one and connecting section two. The positioning spring and bearing spring two are connected at connecting section two, and the connecting spring and bearing spring one are connected at connecting section one.

[0021] In the connection mechanism of the aforementioned elastic support unit, both the outer sides of the first connection segment and the second connection segment are covered with a flexible covering layer.

[0022] In the connection mechanism of the above-mentioned elastic support unit, the covering layer is a rubber material covering the outside of the first connection section and the second connection section.

[0023] In the connection mechanism of the elastic support unit described above, the connection part includes several sections of "bow"-shaped rods, which are arranged symmetrically adjacent to each other in parallel. The transverse segments on several transversely adjacent rods form the connection part described above.

[0024] In the connection mechanism of the above-mentioned elastic support unit, the rods located in the outer frame have horizontal segments on several adjacent rods forming a positioning segment, and the positioning segment, the bearing spring and the positioning spring are connected together.

[0025] The connection mechanism of the above-mentioned elastic support unit also includes a flexible tension limiting mechanism located inside the second elastic support unit. The flexible tension mechanism includes a pull rope one and a pull rope two. The inner end of the pull rope one is connected to the lower part of the elastic support unit, the outer end of the pull rope one is located at the outer end of the second support unit and is connected to the lower part of the second support unit, the inner end of the pull rope two is connected to the upper part of the inner end of the second elastic support unit, and the outer end of the pull rope two is connected to the lower part of the outer end of the second elastic support unit.

[0026] In the connection mechanism of the above-mentioned elastic support unit, the adjacent pull rope one and pull rope two form a tension unit. The number of tension units is several, and the several tension units are evenly distributed along the width direction of the elastic support unit.

[0027] In the connection mechanism of the above-mentioned elastic support unit, when projected along the direction perpendicular to the upper part of the elastic support unit two, the pull rope one and the pull rope two are arranged adjacent to each other and the included angle between them is 20-40 degrees.

[0028] In the connection mechanism of the above-mentioned elastic support unit, both ends of the pull rope are connected to the hinge rod, one of which is hinged to the elastic support unit and the other is hinged to the elastic support unit.

[0029] In the connection mechanism of the aforementioned elastic support unit, one of the hinge rods is movably connected to two adjacent load-bearing springs, and the other hinge rod is movably connected to the outer frame.

[0030] In the connection mechanism of the elastic support unit described above, both ends of the second pull rope are connected to the second hinge rod, and the two second hinge rods are respectively hinged at both ends of the support unit.

[0031] In the connection mechanism of the aforementioned elastic support unit, both hinge rods are movably connected to the outer frame.

[0032] To achieve the second objective mentioned above, this utility model can be implemented through the following technical solutions:

[0033] A sofa bed frame, characterized in that it includes an elastic support unit one and an elastic support unit two, wherein the inner end of the elastic support unit one is connected to the inner end of the elastic support unit two and the two are flush with each other, and the elastic support unit two can be flipped under the action of external force and the flipped support unit two maintains surface contact with the support unit one.

[0034] Compared to existing technologies, in this sofa bed frame, the first load-bearing spring of the elastic support unit is a helical spring, while the second load-bearing spring of the elastic support unit is a serpentine spring. Therefore, when subjected to external force, the second elastic support unit can achieve stable oscillation relative to the first elastic support unit. Since the serpentine spring in the second elastic support unit can conform as closely as possible to the outer frame, its height dimension is relatively small in the folded state, thereby minimizing the space occupied when folded.

[0035] In addition, the connection between the first elastic support unit and the second elastic support unit is kept as far away from each other as possible. Therefore, while ensuring a stable connection between the first elastic support unit and the second elastic support unit, the second elastic support unit can be folded smoothly when subjected to external force, making it easy to carry out storage operations. Attached Figure Description

[0036] Figure 1 This is a 3D structural diagram of the sofa bed frame.

[0037] Figure 2 This is a top view of the sofa bed frame.

[0038] Figure 3 yes Figure 2 A schematic diagram of the local structure at point A.

[0039] Figure 4 yes Figure 2 A schematic diagram of the local structure at point B.

[0040] Figure 5 yes Figure 2 A schematic diagram of the local structure at point C.

[0041] Figure 6 yes Figure 2 A schematic diagram of the local structure at point D.

[0042] Figure 7 This is a three-dimensional structural diagram of the complete structure of the elastic support unit two.

[0043] Figure 8 This is a structural diagram of the rod.

[0044] Figure 9 This is a side view of the sofa bed frame.

[0045] Figure 10 This is a schematic diagram of the main structure of this sofa bed frame.

[0046] Figure 11 This is a structural diagram of the sofa bed frame in its folded-out state.

[0047] Figure 12 This is a structural diagram illustrating the process of folding up a sofa bed frame.

[0048] Figure 13 This is a structural diagram of a sofa bed frame in use.

[0049] In the picture:

[0050] 1. Elastic support unit one; 11. Bearing spring one; 13. Connecting spring; 14. Connecting plate; 141. Hook; 15. Positioning frame one; 16. Connecting frame one; 2. Elastic support unit two; 21. Outer frame; 22. Bearing spring two; 23. Positioning spring; 24. Positioning frame two; 25. Connecting frame two; 26. Connecting part; 261. Connecting section one; 262. Connecting section two; 263. Rod; 2631. Positioning section; 3. Covering layer; 4. Pull rope one; 5. Pull rope two; 6. Hinge rod one; 7. Hinge rod two. Detailed Implementation

[0051] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0052] like Figure 1-10As shown,

[0053] The connecting mechanism of this elastic support unit includes elastic support unit one and elastic support unit two.

[0054] The elastic support unit 1 includes a load-bearing spring 11, a connecting plate 14, and a connecting spring 13. The load-bearing spring 11 is a helical spring. Several load-bearing springs 11 arranged laterally adjacently form a load-bearing unit 1, and several load-bearing units 1 arranged longitudinally adjacently form a load-bearing area 1. The connecting spring 13 is helical and its outer diameter is smaller than that of the load-bearing spring 11. Several load-bearing springs 11 on the load-bearing unit 1 are evenly distributed along the length of the connecting spring 13. The connecting plate 14 is arranged parallel to the load-bearing unit 1, and both the load-bearing spring 11 and the connecting spring 13 are connected to the connecting plate 14.

[0055] The connecting plate 14 serves as a reinforcement, ensuring that the lower part of the entire support unit has sufficient strength.

[0056] Several horizontally distributed load-bearing springs 11 are positioned by connecting springs 13.

[0057] Several longitudinally distributed load-bearing units are positioned and connected by connecting springs 13.

[0058] It can be seen that multiple load-bearing springs 11 are stably connected together by multiple connecting springs 13.

[0059] The upper part of the connecting plate 14 has several protruding hooks 141 along its length direction. The connecting spring 13 is fastened to each hook 141, and the lower part of the partial bearing spring 11 is fastened to the hook 141.

[0060] The hook 141 can stably connect the connecting plate 14, the connecting spring 13, and the bearing spring 11 together.

[0061] Each of the two adjacent bearing units has a connecting spring 11, and each bearing spring 11 on the bearing unit is fastened to the connecting spring 13.

[0062] This structure allows each load-bearing spring 11 to be positioned and connected.

[0063] Both the upper and lower parts of the bearing area 1 have connecting springs 13.

[0064] This structure allows several load-bearing springs to be connected more stably, ultimately forming a structurally stable elastic support unit 1.

[0065] The elastic support unit 1 further includes a positioning frame 15 and a connecting frame 16. The positioning frame 15 is U-shaped, and the inner end of the connecting frame 16 is connected to the bottom of the U-shape of the positioning frame 15. The load-bearing spring 11 located at the outer end of the elastic support unit is connected to the connecting frame 16 through the connecting spring 13.

[0066] Since the sofa bed frame also needs to be covered with an outer layer of fabric, the positioning frame 15, due to the protrusion of the load-bearing spring 11 at the very end, can prevent the side of the load-bearing spring 11 from contacting the outer layer.

[0067] The connecting frame 16 enables the positioning frame 15 to be stably connected to the bearing spring 11 at the far end.

[0068] The number of connecting frames 16 is several, and the connecting frames 16 are evenly distributed along the width direction of the positioning frame 15. Each side of the connecting frame 16 is connected to a corresponding bearing spring 11.

[0069] Setting up multiple connecting frames 16 can further improve the connection stability of the positioning frame 15.

[0070] The second elastic support unit includes an outer frame 21, a second load-bearing spring 22, and a positioning spring 23. There are two outer frames 21, which are arranged vertically and parallel to each other. The second load-bearing spring 22 is a serpentine spring, and its two ends are respectively connected to the corresponding outer frame 21. Several horizontally adjacent second load-bearing springs 22 form a second load-bearing unit, and several vertically adjacent second load-bearing units 22 form a second load-bearing area. The positioning spring 23 is spiral and is connected to the outer frame 21. Several second load-bearing springs 22 on the second load-bearing unit are evenly distributed along the length direction of the positioning spring 23 and are connected to the positioning spring 23.

[0071] The upper and lower ends of the second load-bearing spring 22 are respectively connected to the corresponding outer frame 21. Under the action of the positioning spring 23, the connection stability between the outer frame and the second load-bearing spring 22 can be effectively improved.

[0072] The elastic support unit 2 further includes a positioning frame 24 and a connecting frame 25. The positioning frame 24 is attached to the outer frame 21 and the outer end of the positioning frame 25 extends out of the outer frame 21. The two ends of the connecting frame 25 are respectively connected to the positioning frame 24 and the outer frame 21.

[0073] Since the outer side of the elastic support unit 2 needs to be covered with a fabric outer layer, the positioning frame 24 can keep the load-bearing spring 22 as far away from the outer layer as possible.

[0074] Under the action of the connecting frame 25, the positioning frame 24 can be stably connected to the elastic support unit 2.

[0075] The number of connecting frames 25 is several, and the connecting frames 25 are evenly distributed along the width direction of the positioning frame 24.

[0076] Multiple connecting frames 25 can ensure a stable connection between the positioning frame 24 and the outer frame 21.

[0077] It also includes a connecting part 26, the inner end of which is connected to the outer frame 21, and the outer end of which extends out of the outer frame 21. The connecting part 26 extending out of the outer frame 21 has two horizontally arranged connecting sections: connecting section one 261 and connecting section two 262. The positioning spring 23 and the bearing spring two 22 are connected at connecting section two 262, and the connecting spring 13 and the bearing spring one 11 are connected at connecting section one 261.

[0078] The connecting part has two functions:

[0079] Firstly, try to maintain an appropriate distance between the inner end of the elastic support unit 1 and the inner end of the elastic support unit 2.

[0080] Secondly, the first connecting segment 261 on the connecting part is used to stably connect with the first elastic support unit, and the second connecting segment 262 is used to stably connect with the second elastic support unit, so as to ensure that the connection points of the first elastic support unit and the second elastic support unit are independent of each other and ensure their connection stability.

[0081] Both the first connecting segment 261 and the second connecting segment 262 are covered with a flexible covering layer 3.

[0082] The covering layer 3 is a rubber material covering the outside of connecting section one and connecting section two.

[0083] During the process of bearing spring 11 being subjected to force, the covering layer 3 can appropriately eliminate the frictional noise at the connection of bearing spring 11.

[0084] The connecting part includes several "bow"-shaped rods 263, which are arranged symmetrically and parallel to each other. The transverse segments on several transversely adjacent rods 263 form the connecting part described above.

[0085] Multiple rods 263 can improve the connection stability between the entire connecting part and the outer frame 21.

[0086] The rod 263 located inside the outer frame 21 has horizontal segments on several adjacent rods forming a positioning segment 2631, and the positioning segment 2631, the bearing spring 22, and the positioning spring 23 are connected together.

[0087] The positioning segment 2631 on the rod 263 provides sufficient space for the load-bearing spring 22 and the positioning spring 23 to connect, ultimately ensuring the stability of their connection.

[0088] It also includes a flexible tension limiting mechanism located within the second elastic support unit. The flexible tension mechanism includes a pull rope 4 and a pull rope 5. The inner end of the pull rope 4 is connected to the lower part of the first elastic support unit 1, and the outer end of the pull rope 4 is located at the outer end of the second support unit 2 and is connected to the lower part of the first support unit 1. The inner end of the pull rope 5 is connected to the upper part of the inner end of the second elastic support unit 2, and the outer end of the pull rope 5 is connected to the lower part of the outer end of the second elastic support unit 2.

[0089] The flexible tension limiting mechanism serves to reinforce the elastic support unit 2.

[0090] Since the load-bearing spring 11 in the elastic support unit 1 is a helical spring, it can stably bear the gravity acting on the upper part of the elastic support unit 1.

[0091] However, the load-bearing spring 22 in the elastic support unit 2 is a serpentine spring. Although it can be compressed after being subjected to force, the load-bearing spring 22 may deflect to the left or right.

[0092] Conversely, this flexible tension limiting mechanism is used to restrict the left and right swing direction of the bearing spring 22, ultimately ensuring that the entire elastic support unit 2 can stably buffer when its upper part is subjected to gravity.

[0093] The adjacent pull rope 4 and pull rope 5 form a tension unit. There are several tension units, which are evenly distributed along the width direction of the elastic support unit 2.

[0094] Multiple rope units can effectively improve stability and ensure that all parts of the elastic support unit 2 can be stably stressed.

[0095] Projecting along a direction perpendicular to the upper part of the elastic support unit 2, the pull rope 4 and pull rope 5 are arranged adjacently with an included angle of 20 degrees. Depending on the actual situation, an included angle of 30 degrees is also feasible.

[0096] This structure ensures that all parts of the entire elastic support unit 2 are fixed in place.

[0097] Both ends of the pull rope 4 are connected to hinge rods 6. One hinge rod 6 is hinged to the elastic support unit 1, and the other hinge rod is hinged to the elastic support unit 2.

[0098] The pull rope 4 is a high-strength nylon braided belt. The hinge rod 6 enables the two ends of the pull rope 4 to be quickly and stably connected at the corresponding connection positions.

[0099] Two hinge rods 6 on the same pull rope 4, one of which is movably connected to two adjacent load-bearing springs 11, and the other hinge rod 6 is movably connected to the outer frame 21.

[0100] Both ends of the second rope 5 are connected to the second hinge rod 7, and the two hinge rods 7 are respectively hinged at both ends of the support unit.

[0101] Both hinge rods 7 are movably connected to the outer frame 21.

[0102] The second pull rope 5 is a high-strength nylon braided belt. The hinge rod 7 enables the two ends of the second pull rope 5 to be quickly and stably connected at the corresponding connection positions.

[0103] This sofa bed frame includes an elastic support unit 1 and an elastic support unit 2. The inner end of the elastic support unit 1 is connected to the inner end of the elastic support unit 2 and the two are flush. The elastic support unit 2 can be flipped under the action of external force and the flipped support unit 2 and support unit 1 are in surface contact.

[0104] This sofa bed frame has two states:

[0105] Elastic support unit 1 and elastic support unit 2 are aligned with each other, at which point the entire sofa bed frame is in the unfolded usage state.

[0106] An external force is applied to cause the elastic support unit 2 to flip relative to the elastic support unit 1. After flipping, the elastic support unit 2 is attached to the upper part of the elastic support unit 1. At this time, the entire sofa bed frame is in a folded storage state.

[0107] The above-described technical solution of this utility model addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The parts not covered in this application's technical solution are the same as or can be implemented using existing technologies, and will not be described in detail here.

[0108] The technical solutions in the above embodiments have clearly and completely described the content of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A connecting mechanism for an elastic support unit, characterized in that, Includes elastic support unit one and elastic support unit two; The elastic support unit 1 includes a bearing spring 1, a connecting plate and a connecting spring. The bearing spring 1 is a helical spring. Several bearing springs 1 arranged laterally adjacent to each other form a bearing unit 1. Several bearing units 1 arranged longitudinally adjacent to each other form a bearing area 1. The connecting spring is helical and its outer diameter is smaller than that of the bearing spring 1. Several bearing springs 1 on the bearing unit 1 are evenly distributed along the length direction of the connecting spring. The connecting plate is arranged parallel to the bearing unit 1 and both the bearing spring 1 and the connecting spring are connected to the connecting plate. The second elastic support unit includes an outer frame, a second load-bearing spring, and a positioning spring. There are two outer frames arranged parallel to each other vertically. The second load-bearing spring is a serpentine spring, and its two ends are respectively connected to the corresponding outer frame. Several horizontally adjacent second load-bearing springs form a second load-bearing unit, and several vertically adjacent second load-bearing units form a second load-bearing area. The positioning spring is spiral and connected to the outer frame. Several second load-bearing springs on the second load-bearing unit are evenly distributed along the length of the positioning spring and are connected to the positioning spring. It also includes a connecting part, the inner end of which is connected to the outer frame, and the outer end of which extends out of the outer frame. The connecting part extending out of the outer frame has two horizontally arranged connecting sections: connecting section one and connecting section two. The positioning spring and bearing spring two are connected at connecting section two, and the connecting spring and bearing spring one are connected at connecting section one.

2. The connecting mechanism of the elastic support unit according to claim 1, characterized in that, Both connecting segment one and connecting segment two are covered with a flexible covering layer on their outer sides.

3. The connecting mechanism of the elastic support unit according to claim 1, characterized in that, The covering layer is a rubber material covering the outside of connecting section one and connecting section two.

4. The connecting mechanism of the elastic support unit according to claim 1, characterized in that, The connecting part includes several sections of "bow"-shaped rods, which are arranged symmetrically adjacent to each other in parallel. The transverse segments on several transversely adjacent rods form the aforementioned connecting part.

5. The connecting mechanism of the elastic support unit according to claim 1, characterized in that, The rods located within the outer frame have horizontal segments on several adjacent rods forming a positioning segment, and the positioning segment, the bearing spring, and the positioning spring are connected together.

6. The connecting mechanism of the elastic support unit according to claim 1, characterized in that, The upper part of the connecting plate has several protruding hooks along its length, and the connecting spring is fastened to each hook. The lower part of the partial load-bearing spring is fastened to the hook.

7. The connecting mechanism of the elastic support unit according to claim 1, characterized in that, Each of the two adjacent load-bearing units has a connecting spring, and each load-bearing spring on the load-bearing unit is fastened to the connecting spring.

8. The connecting mechanism of the elastic support unit according to claim 1, characterized in that, Both the upper and lower parts of the bearing area one are equipped with connecting springs.

9. The connecting mechanism of the elastic support unit according to claim 1, characterized in that, The elastic support unit 1 further includes a positioning frame 1 and a connecting frame 1. The positioning frame 1 is U-shaped, and the inner end of the connecting frame 1 is connected to the bottom of the U-shape of the positioning frame 1. The bearing spring 1 located at the outer end of the elastic support unit 1 is connected to the connecting frame 1 through a connecting spring.

10. A sofa bed frame employing any one of claims 1-9, characterized in that, It includes an elastic support unit one and an elastic support unit two. The inner ends of the elastic support unit one and the elastic support unit two are connected and are flush with each other. The elastic support unit two can be flipped under the action of external force and the flipped support unit two and support unit one are in surface contact.

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