A quick stow integrated sofa bed and method of use

Abstract

The application relates to the technical field of sofa beds, in particular to a quick storage integrated sofa bed and a use method, which comprise a backrest support and a leg support, and the backrest support is composed of two guide rails and a connecting rod. The quick storage integrated sofa bed and the use method can form a sofa by combining the leg support, a round beam plate and the backrest support after pulling out the round beam with the length of the sofa, and can form a bed by combining the leg support, the round beam plate and the backrest support after pulling out the round beam with the length of the bed, so that the sofa and the bed can be quickly switched, the round beam plate can be rolled up when being stored in the bottom cylinder, and the horizontal plate is automatically formed after being released, compared with the bed body which is pulled and folded, the switching process of the sofa and the bed is more labor-saving, easy and fast, compared with the frame type pulling structure of the common sofa bed, the good use effect is ensured, and the invalid space occupation of the storage part can be reduced.

Description

Technical Field

[0001] This invention relates to the field of sofa bed technology, specifically to a quick-folding integrated sofa bed and its usage method. Background Technology

[0002] A sofa bed is a piece of furniture that can be used as both a sofa and a bed. Typically, a sofa bed can be placed in the living room or study, serving as seating; when needed, it can be unfolded and covered with bedding to become a bed. Currently, the most common sofa beds on the market are two-fold or three-fold, and can be divided into folding types where the backrest is flattened and pull-out types that extend and retract via sliding rails.

[0003] An existing patent (publication number: CN105996555A) discloses a folding sofa bed, including a sofa seat with an internal storage slot and a folding bed that can be folded inside the sofa seat. A cushion is hinged to the sofa seat to cover it. Two hinged rods connect the two sides of one end of the folding bed to the interior of the sofa seat via two hinged rods, with their ends hinged to the sofa seat and the folding bed respectively, forming a quadrilateral structure. The cushion includes a first flap that is hinged to one side of the sofa seat, rotated 90 degrees, and then rests against the sofa seat at its bottom for fixation; and a second flap that is hinged to the other end of the first flap, rotated, and then rests against a nearby end of the folding bed. This type of sofa bed mainly relies on the flipping, folding, or pulling of the frame and panels to switch between sofa and bed modes. The frame and panel structure takes up a lot of space when folded, is not convenient to operate, and is difficult to move.

[0004] In view of this, we propose a quick-folding integrated sofa bed and its usage method. Summary of the Invention

[0005] The purpose of this invention is to provide a quick-folding integrated sofa bed and its usage method, to solve the problems mentioned in the background art, which mainly rely on the flipping, folding, or pulling of the frame and panels to achieve the conversion between a sofa and a bed. These problems include the large space occupied by the frame and panel structure during storage, inconvenient operation, and difficulty in transportation. To achieve the above objective, this invention provides the following technical solution: a quick-folding integrated sofa bed, including a backrest support and leg supports, wherein the backrest support consists of two guide rails and a connecting rod, and the connecting rod is fixedly connected between the two guide rails.

[0006] A retractor is provided between the leg support and the backrest support.

[0007] Preferably, the retractor includes a back tube and a bottom tube movably mounted on the backrest support, and slides are fixedly mounted at both ends of the back tube and the bottom tube, and the back tube and the bottom tube are engaged along two guide rails via the slides.

[0008] The bottom cylinder is provided with several circular beams, and two adjacent circular beams are rotatably connected by a hinge. The hinge is designed with an "8" shape. The circular beams are provided with annular grooves, and the two ends of the hinge are respectively rotatably connected to the annular grooves on two adjacent circular beams.

[0009] A caliper is fixedly installed on the upper side of the hinge end, and the upward rotation of the two hinges in a single annular groove is restricted by the caliper.

[0010] The circular beam closest to the leg support is hinged to the leg support.

[0011] A shaft is provided inside the bottom cylinder, and a disc is fixedly installed at both ends of the shaft. A winding rod is fixedly connected between the two discs. An opening is provided on the surface of the bottom cylinder, and the round beam closest to the backrest support passes through the opening and is hinged to the winding rod.

[0012] The bottom cylinder has shaft holes at both ends and on the corresponding slide. The shaft is rotatably connected in the two shaft holes, and a torsion spring is movably sleeved at the end of the shaft. The two ends of the torsion spring are respectively connected to the disc and the bottom cylinder, and the torsion spring pushes the winding rod to rewind the round beam along the surface of the shaft.

[0013] The bottom cylinder is equipped with a self-locking device that cooperates with the circular beam.

[0014] The back support is located on the upper side of the bottom support, and a self-folding mattress adapted to the round beam is installed on the back support and the leg support.

[0015] Preferably, the self-locking device includes a circular shell fixedly mounted on the bottom cylinder, and the upper side of the circular shell has an open structure. A toothed disc is rotatably connected inside the circular shell. The end of the circular beam is provided with a slot corresponding to the toothed disc, and the circular beam is engaged in the toothed surface of the toothed disc through the slot.

[0016] The gear disc has a toothed hole along the axial direction. A pin is inserted into the circular shell along the axial direction and passes through the toothed hole. A one-way bearing is installed on the surface of the pin, and a gear one that matches the toothed hole is provided on the outer ring of the one-way bearing. A gear two is rotatably connected to the surface of the pin and adjacent to the gear one.

[0017] Preferably, the self-folding mattress includes a second shaft rotatably connected inside the backrest, and a cotton pad is provided on the second shaft. The surface of the backrest has an opening, and the movable end of the cotton pad passes through the opening and is engaged with the leg support.

[0018] The end of the second shaft is movably sleeved with a second torsion spring, and the two ends of the second torsion spring are respectively connected to the second shaft and the back cylinder. The second torsion spring pushes the second shaft to roll up the cotton pad.

[0019] Preferably, a cushion is fixedly provided on the surface of the back tube.

[0020] Preferably, handles are fixedly provided on the surfaces of both the back tube and the bottom tube.

[0021] Preferably, the movable end of the cotton pad has two through holes, and the top of the leg support is fixedly provided with two curved hooks, and the cotton pad is snapped into place along the curved hooks through the through holes.

[0022] A method for using a quick-folding, integrated sofa bed includes the following steps:

[0023] S1. Pulling the leg support moves it in opposite directions relative to the backrest support. The leg support pulls the round beam outward along the bottom tube, causing the round beam, which is wound inside the bottom tube by the hinge, to be pulled out. Due to the restriction of the clamps between two adjacent round beams and the hinges, the two round beams cannot be turned downwards by the hinges. That is, the round beam pulled out of the bottom tube is locked in a flat state by the clamps and hinges by gravity, forming a horizontal board. After pulling out the round beam that matches the length of the sofa, the leg support, the round beam board, and the backrest support are combined to form a sofa. After pulling out the round beam that matches the length of the bed, the leg support, the round beam board, and the backrest support are combined to form a bed.

[0024] S2. When the round beam moves, the slot at its end synchronously pushes the gear plate to rotate. During the process of the leg support pulling out the round beam, the gear plate and gear one are engaged, and the one-way bearing does not affect the rotation of gear one and gear plate at this time, so that the round beam is pulled out normally. However, the one-way bearing locks the rotation of gear one and gear plate. When it is necessary to rewind the round beam, the pin shaft is pushed to move, so that gear one is disengaged from the tooth hole. Gear two is connected in parallel with gear plate along the tooth hole. At this time, gear plate can rotate freely in both directions and release the lock on the round beam. Torsion spring one pushes the winding rod to rewind the round beam along the surface of shaft one.

[0025] S3. During the process of pulling out the round beam from the leg support, the cotton pad is pulled out synchronously along the back tube and laid on the surface of the round beam. This allows the cotton pad to adapt to the area of ​​the round beam in real time, and the cotton pad can also be recycled synchronously when the round beam is rolled up.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] In this invention, the round beam is pulled outward along the base tube by the leg support, causing the round beam, which is rolled up inside the base tube by the hinge, to be pulled out. Due to the restriction of the clamps between two adjacent round beams and the hinges, the two round beams cannot be turned downwards by the hinges. That is, the round beam pulled out of the base tube is locked in a flat state by the clamps and hinges by gravity, forming a horizontal panel. After pulling out the round beam that matches the length of the sofa, the leg support, the round beam panel, and the backrest support are combined to form a sofa. After pulling out the round beam that matches the length of the bed, the leg support, the round beam panel, and the backrest support are combined to form a bed. This achieves a quick switch between sofa and bed. Moreover, the panel formed by the round beam can be rolled up when it is put back into the base tube, and automatically forms a horizontal panel after release. Compared with dragging and folding the bed, the process of switching between sofa and bed is more effortless, easy, and quick. Compared with the frame-type pull-out structure of common sofa beds, it ensures a good user experience while reducing the ineffective space occupied by the storage part.

[0028] In this invention, the toothed disc is synchronously driven to rotate through the slot at the end of the round beam. During the process of the leg support pulling out the round beam, the toothed disc engages with gear one, and the one-way bearing does not affect the rotation of gear one and the toothed disc at this time, allowing the round beam to be pulled out normally. However, the one-way bearing locks the rotation of gear one and the toothed disc. When it is necessary to rewind the round beam, the pin is pushed to displace, causing gear one to disengage from the tooth hole. Gear two is connected in parallel with the toothed disc along the tooth hole. At this time, the toothed disc can rotate freely in both directions and release the lock on the round beam. Torsion spring one pushes the winding rod to rewind the round beam along the surface of shaft one. By switching the state of the toothed disc, the movement of the round beam is controlled. On the one hand, this avoids the round beam being rewinded by torsion spring one, and on the other hand, it ensures the stability of use in sofa and bed states.

[0029] In this invention, during the process of pulling out the round beam via the leg support, the leg support simultaneously pulls out the cotton pad along the back tube, laying the cotton pad on the surface of the round beam. This allows the cotton pad to adapt in real time to the area formed by the round beam, and the cotton pad can also be synchronously recycled when the round beam is rolled up. Compared with common sofa beds, this device does not require manual replacement of the soft pad after switching states, making it more automated. When not in use, the cotton pad and round beam can be rolled up separately in the back tube and bottom tube, respectively, avoiding dust and pollution caused by external placement.

[0030] In this invention, since the cotton pad and the round beam are matched in real time when pulled outwards and stored separately after recycling, and the back tube and the bottom tube are snapped onto the back support, the user can disassemble and separate the bottom tube and the back tube as needed when not in use or when moving the sofa bed. On the one hand, the modular structure facilitates placement, and on the other hand, the separate small modules can easily pass through narrow places. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 2 This is a bottom view of the three-dimensional structure of the present invention;

[0033] Figure 3 This is a side view of the present invention in its sofa state;

[0034] Figure 4 This is an exploded view of the present invention;

[0035] Figure 5 This is a schematic diagram of the backrest support structure in this invention;

[0036] Figure 6 This is a three-dimensional sectional view of the back tube in this invention;

[0037] Figure 7 This is a three-dimensional structural diagram of the circular beam and bottom cylinder in this invention;

[0038] Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle;

[0039] Figure 9 This is a schematic diagram of the circular beam and hinge in the present invention;

[0040] Figure 10 This is an exploded view of the bottom cylinder, shaft 1, and circular beam in this invention;

[0041] Figure 11 This is a side sectional view of the bottom cylinder in this invention;

[0042] Figure 12 This is an exploded view of the gear disc, gear one, gear two, and pin shaft in this invention.

[0043] In the diagram: 1. Backrest support; 11. Guide rail; 12. Connecting rod; 2. Leg support; 3. Retractor; 31. Back tube; 32. Base tube; 33. Slide; 34. Round beam; 35. Hinge; 36. Ring groove; 37. Caliper; 38. Shaft one; 39. Disc; 310. Winding rod; 311. Through port one; 312. Shaft hole; 313. Torsion spring one; 314. Self-locking device; 3141. Round shell; 3142. Gear disc; 3143. Slot; 3144. Gear hole; 3145. Pin; 3146. One-way bearing; 3147. Gear one; 3148. Gear two; 315. Self-folding mattress; 3151. Shaft two; 3152. Cotton pad; 3153. Through port two; 3154. Torsion spring two. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figures 1 to 12 The present invention provides a technical solution: a quick-folding integrated sofa bed, including a backrest support 1 and a leg support 2. The backrest support 1 consists of two guide rails 11 and a connecting rod 12, and the connecting rod 12 is fixedly connected between the two guide rails 11.

[0046] A retractor 3 is provided between the leg support 2 and the backrest support 1.

[0047] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, the retractor 3 includes a back tube 31 and a bottom tube 32 movably mounted on the backrest support 1. Slides 33 are fixedly mounted on both the left and right ends of the back tube 31 and the left and right ends of the bottom tube 32. The back tube 31 and the bottom tube 32 are engaged along two guide rails 11 via the slides 33. The back tube 31 and the bottom tube 32 are engaged on the backrest support, so the user can disassemble and separate the bottom tube 32 from the back tube 31 as needed when not in use or when moving the sofa bed.

[0048] The bottom cylinder 32 is provided with several circular beams 34, and two adjacent circular beams 34 are rotatably connected by hinges 35. The hinges 35 are set with an "8" shaped structure. The circular beams 34 are provided with annular grooves 36, and the two ends of the hinges 35 are respectively rotatably connected to the annular grooves 36 on two adjacent circular beams 34.

[0049] A clamp 37 is fixedly installed on the upper side of the end of the hinge 35. The upward rotation of the two hinges 35 in a single annular groove 36 is restricted by the clamp 37. Since the two adjacent round beams 34 and the hinges 35 are restricted by the clamp 37, the two round beams 34 cannot rotate downward through the hinges 35. That is, the round beams 34 that are pulled out of the bottom cylinder 32 are locked in a flat state by the clamp 37 and the hinges 35 due to gravity, and form a horizontal plate surface.

[0050] The round beam 34 closest to the leg support 2 is hinged to the leg support 2;

[0051] A shaft 38 is provided inside the bottom cylinder 32, and a disc 39 is fixedly installed at both ends of the shaft. A winding rod 310 is fixedly connected between the two discs 39. A through-hole 311 is opened on the surface of the bottom cylinder 32. The round beam 34 closest to the backrest bracket 1 passes through the through-hole 311 and is hinged to the winding rod 310.

[0052] Shaft holes 312 are provided at both ends of the bottom cylinder 32 and on the corresponding slide 33. Shaft rod 38 is rotatably connected in the two shaft holes 312, and torsion spring 313 is movably sleeved at the end of shaft rod 38. The two ends of torsion spring 313 are respectively connected to disc 39 and bottom cylinder 32. Torsion spring 313 pushes the winding rod 310 to wind the round beam 34 along the surface of shaft rod 38. Due to the restriction of caliper 37 between the two adjacent round beams 34 and the hinge 35, the two round beams 34 cannot be rotated down through the hinge 35. That is, the round beam 34 pulled out of the bottom cylinder 32 is locked in a flat state by the caliper 37 and the hinge 35 under gravity, forming a horizontal plate surface.

[0053] A self-locking device 314 that cooperates with the circular beam 34 is provided on the bottom cylinder 32;

[0054] The back support 31 is located on the upper side of the bottom support 32, and the back support 31 and the leg support 2 are equipped with a self-folding mattress 315 that is compatible with the round beam 34.

[0055] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, the self-locking device 314 includes a circular shell 3141 fixedly mounted on the bottom cylinder 32, and the upper side of the circular shell 3141 is an open structure. A gear disk 3142 is rotatably connected inside the circular shell 3141. The end of the circular beam 34 is provided with a slot 3143 corresponding to the gear disk 3142, and the circular beam 34 is engaged in the tooth surface of the gear disk 3142 through the slot 3143. When the circular beam 34 moves, the slot 3143 at its end synchronously pushes the gear disk 3142 to rotate.

[0056] The gear disc 3142 has a toothed hole 3144 along the axial direction. A pin 3145 is rotatably inserted into the cylindrical shell 3141 along the axial direction, and the pin 3145 passes through the toothed hole 3144. A one-way bearing 3146 is mounted on the surface of the pin 3145, and a gear 3147 that matches the toothed hole 3144 is provided on the outer ring of the one-way bearing 3146. During the process of the leg bracket 2 pulling out the cylindrical beam 34, the gear disc 3142 and the gear 3147 engage, and the one-way bearing 3146 does not affect the gear 3147 at this time. The rotation of gear 7 and gear disk 3142 allows the round beam 34 to be pulled out normally. However, the one-way bearing 3146 locks the rotation of gear 1 3147 and gear disk 3142. Gear 2 3148 is rotatably connected to the surface of pin 3145 and adjacent to gear 1 3147, pushing pin 3145 to move and causing gear 1 3147 to disengage from the tooth hole 3144. Gear 2 3148 is connected in parallel with gear disk 3142 along tooth hole 3144. At this time, gear disk 3142 can rotate freely in both directions and release the lock on round beam 34.

[0057] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, the self-folding mattress 315 includes a shaft 3151 rotatably connected inside the backrest 31, and a cotton pad 3152 is provided on the shaft 3151. The backrest 31 has an opening 3153 on its surface. The movable end of the cotton pad 3152 passes through the opening 3153 and is engaged with the leg support 2. When the leg support 2 pulls out the round beam 34, it pulls out the cotton pad 3152 along the backrest 31, and lays the cotton pad 3152 on the surface of the round beam 34.

[0058] A torsion spring 3154 is movably sleeved at the end of shaft 3151, and the two ends of the torsion spring 3154 are respectively connected to shaft 3151 and back cylinder 31. The torsion spring 3154 pushes shaft 3151 to roll up cotton pad 3152.

[0059] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, a cushion is fixedly provided on the surface of the backrest 31, which improves the comfort of the user when leaning against the backrest 31.

[0060] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, handles are fixedly provided on the surfaces of the back tube 31 and the bottom tube 32, so that users can lift and lower the back tube 31 and the bottom tube 32 along the guide rail 11 for disassembly and assembly.

[0061] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, the movable end of the cotton pad 3152 has two through holes, and the top of the leg support 2 is fixedly provided with two hooks. The cotton pad 3152 is engaged with the hooks through the through holes. The cotton pad 3152 can be separated from the leg support 2 by removing the through holes at the end of the cotton pad 3152 from the hooks, which makes it convenient to assemble and disassemble the cotton pad 3152 and the plate composed of the round beam 34.

[0062] A method for using a quick-folding, integrated sofa bed includes the following steps:

[0063] S1. Pulling the leg support 2 causes it to move away from the backrest support 1. The leg support 2 pulls the round beam 34 outward along the bottom cylinder 32, so that the round beam 34, which is wound in the bottom cylinder 32 by the hinge 35, is pulled out. Because the two adjacent round beams 34 and the hinge 35 are restricted by the clamp 37, the two round beams 34 cannot rotate downward by the hinge 35. That is, the round beam 34 pulled out of the bottom cylinder 32 is locked in a flat state by the clamp 37 and the hinge 35 by gravity, and forms a horizontal board. After pulling out the round beam 34 that is the length of the sofa, the leg support 2, the board of the round beam 34 and the backrest support 1 are combined to form a sofa. After pulling out the round beam 34 that is the length of the bed, the leg support 2, the board of the round beam 34 and the backrest support 1 are combined to form a bed.

[0064] S2. When the round beam 34 moves, the slot 3143 at its end synchronously pushes the gear disk 3142 to rotate. During the process of the leg bracket 2 pulling out the round beam 34, the gear disk 3142 engages with the gear 1 3147, and the one-way bearing 3146 does not affect the rotation of the gear 1 3147 and the gear disk 3142 at this time, so that the round beam 34 can be pulled out normally. However, the one-way bearing 3146 locks the rotation of the gear 1 3147 and the gear disk 3142. When it is necessary to rewind the round beam 34, the pin 3145 is pushed to move, so that the gear 1 3147 disengages from the tooth hole 3144, and the gear 2 3148 is connected in parallel with the gear disk 3142 along the tooth hole 3144. At this time, the gear disk 3142 can rotate freely in both directions and release the lock on the round beam 34. The torsion spring 1 313 pushes the winding rod 310 to rewind the round beam 34 along the surface of the shaft 1 38.

[0065] S3. During the process of pulling out the round beam 34 from the leg support 2, the cotton pad 3152 is pulled out along the back tube 31 and laid on the plate surface of the round beam 34. This allows the cotton pad 3152 to adapt to the area of ​​the plate surface formed by the round beam 34 in real time, and the cotton pad 3152 can also be synchronously recycled when the round beam 34 is rolled up.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-folding integrated sofa bed, comprising a backrest support (1) and a leg support (2), characterized in that: The backrest bracket (1) consists of two guide rails (11) and a connecting rod (12), with the connecting rod (12) fixedly connected between the two guide rails (11); A retractor (3) is provided between the leg support (2) and the backrest support (1); The retractor (3) includes a back tube (31) and a bottom tube (32) movably mounted on the backrest bracket (1), and slides (33) are fixedly mounted on both the left and right ends of the back tube (31) and the left and right ends of the bottom tube (32). The back tube (31) and the bottom tube (32) are connected by slides (33) along two guide rails (11). The bottom cylinder (32) is provided with a number of circular beams (34), and two adjacent circular beams (34) are rotatably connected by hinges (35). The hinges (35) are set in a figure-eight shape. The circular beams (34) are provided with annular grooves (36). The two ends of the hinges (35) are respectively rotatably connected in the annular grooves (36) on two adjacent circular beams (34). A caliper (37) is fixedly provided on the upper side of the end of the hinge (35), and the upward rotation of the two hinges (35) in a single annular groove (36) is restricted by the caliper (37); The circular beam (34) closest to the leg support (2) is hinged to the leg support (2); The bottom cylinder (32) is provided with a shaft (38), and a disc (39) is fixedly installed at both ends of the shaft. A winding rod (310) is fixedly connected between the two discs (39). The surface of the bottom cylinder (32) is provided with a through opening (311). The round beam (34) closest to the backrest bracket (1) passes through the through opening (311) and is hinged to the winding rod (310). The bottom cylinder (32) has shaft holes (312) at both ends and on the corresponding slide (33). The shaft (38) is rotatably connected in the two shaft holes (312), and the end of the shaft (38) is movably sleeved with a torsion spring (313). The two ends of the torsion spring (313) are respectively connected to the disc (39) and the bottom cylinder (32), and the torsion spring (313) pushes the winding rod (310) to wind the round beam (34) along the surface of the shaft (38). The bottom cylinder (32) is provided with a self-locking device (314) that cooperates with the circular beam (34); The back tube (31) is located on the upper side of the bottom tube (32), and the back tube (31) and the leg support (2) are provided with self-folding mattresses (315) that are compatible with the round beam (34); The self-locking device (314) includes a circular shell (3141) fixedly mounted on the bottom cylinder (32), and the upper side of the circular shell (3141) is an open structure. A toothed disc (3142) is rotatably connected inside the circular shell (3141). The end of the circular beam (34) is provided with a slot (3143) corresponding to the toothed disc (3142), and the circular beam (34) is engaged in the tooth surface of the toothed disc (3142) through the slot (3143). The gear disk (3142) has a toothed hole (3144) along the axial direction. A pin (3145) is rotatably inserted into the circular shell (3141) along the axial direction, and the pin (3145) passes through the toothed hole (3144). A one-way bearing (3146) is installed on the surface of the pin (3145), and a gear one (3147) adapted to the toothed hole (3144) is provided on the outer ring of the one-way bearing (3146). A gear two (3148) is rotatably connected to the surface of the pin (3145) and adjacent to the gear one (3147). The self-folding mattress (315) includes a second shaft (3151) rotatably connected inside the back tube (31), and a cotton pad (3152) is provided on the second shaft (3151). The back tube (31) has a second opening (3153) on its surface, and the movable end of the cotton pad (3152) passes through the second opening (3153) and is snapped onto the leg support (2). The end of the shaft two (3151) is movably sleeved with a torsion spring two (3154), and the two ends of the torsion spring two (3154) are respectively connected to the shaft two (3151) and the back cylinder (31). The torsion spring two (3154) pushes the shaft two (3151) to roll up the cotton pad (3152). The movable end of the cotton pad (3152) has two through holes, and the top of the leg support (2) is fixedly provided with two curved hooks. The cotton pad (3152) is snapped into place along the curved hooks through the through holes.

2. The quick-folding integrated sofa bed according to claim 1, characterized in that: A cushion is fixedly provided on the surface of the back tube (31).

3. The quick-folding integrated sofa bed according to claim 2, characterized in that: Handles are fixedly provided on the surfaces of the back tube (31) and the bottom tube (32).

4. The method of using the quick-folding integrated sofa bed according to claim 1 includes the following steps: S1. Pull the leg support (2) to move back and forth based on the backrest support (1). The leg support (2) pulls the round beam (34) outward along the bottom tube (32), so that the round beam (34) rolled in the bottom tube (32) by the hinge (35) is pulled out. Since the two adjacent round beams (34) and the hinge (35) are restricted by the caliper (37), the two round beams (34) cannot be turned down by the hinge (35). That is, the round beam (34) pulled out of the bottom tube (32) is locked in a flat state by the caliper (37) and the hinge (35) by gravity, and forms a horizontal board. After pulling out the round beam (34) that matches the length of the sofa, the leg support (2), the round beam (34) board and the backrest support (1) are combined to form a sofa. After pulling out the round beam (34) that matches the length of the bed, the leg support (2), the round beam (34) board and the backrest support (1) are combined to form a bed. S2. When the circular beam (34) moves, the slot (3143) at its end synchronously pushes the gear plate (3142) to rotate. During the process of the leg bracket (2) pulling out the circular beam (34), the gear plate (3142) engages with gear one (3147), and the one-way bearing (3146) does not affect the rotation of gear one (3147) and gear plate (3142) at this time, so that the circular beam (34) can be pulled out normally. However, the one-way bearing (3146) locks gear one (3147) and gear plate (3142). When the rotation of the gear disk (3142) requires the winding of the round beam (34), the push pin (3145) is displaced, causing gear one (3147) to disengage from the tooth hole (3144), and gear two (3148) to be connected in parallel with the gear disk (3142) along the tooth hole (3144). At this time, the gear disk (3142) can rotate freely in both directions and release the lock on the round beam (34). Torsion spring one (313) pushes the winding rod (310) to wind the round beam (34) along the surface of shaft one (38). S3. During the process of the leg support (2) pulling out the round beam (34), the cotton pad (3152) is pulled out along the back tube (31) and laid on the surface of the round beam (34). This allows the cotton pad (3152) to adapt to the area of ​​the surface formed by the round beam (34) in real time. When the round beam (34) is rolled up, the cotton pad (3152) can also be recycled synchronously.

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