A labor-saving sofa bed storage structure

Abstract

The application discloses a labor-saving sofa bed storage structure, and relates to the technical field of furniture manufacturing. The labor-saving sofa bed storage structure comprises a storage box, mounting grooves are formed in the two sides of the storage box, support assemblies are arranged in each mounting groove, the support assembly comprises a fixing seat, a short rod, a moving seat, a sliding block and a long rod, the bottom of the sliding block is fixedly connected with the moving seat, one end of the long rod is rotationally connected with the moving seat, the other end of the long rod is fixedly provided with a supporting wheel, the other end of the short rod is rotationally connected with the middle part of the long rod, and the supporting wheel can be driven to change from an inclined state to a supporting state or from the supporting state to a storage state when the sliding block moves along the sliding groove. The labor-saving sofa bed storage structure has the advantages that the support assembly which can be automatically unfolded along with the storage box is arranged, the front end of the storage box is supported in the pulled-out state, and the problem that the storage box is prone to drooping and has poor bearing stability after being pulled out in the prior sofa bed storage structure is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of furniture manufacturing technology, and in particular to a push-pull effortless sofa bed storage structure. Background Technology

[0002] Sofa beds, as furniture that combines sitting and sleeping functions, usually have storage structures under their bed frame or cushions for storing bedding, clothing, or other daily necessities. Most existing sofa beds use pull-out storage boxes, which are located inside the main body of the sofa bed and connected to the main body via slide rails or guides, allowing the storage boxes to be pulled out or pushed back relative to the main body of the sofa bed in the front-back direction.

[0003] During use, the user pulls the storage box outward along the slide rail or roller support structure, thereby exposing the storage space for easy access to items. After use, the storage box is pushed back into the sofa bed in the opposite direction. When the storage box is in the retracted state, its overall weight is mainly supported by the main body of the sofa bed. When the storage box is pulled out, the front end of the storage box gradually moves away from the support range of the main body of the sofa bed, and its weight and the weight of the contents inside are mainly supported by the slide rail or bottom support structure.

[0004] The existing sofa bed storage structure still has certain shortcomings in actual use. When the storage box is pulled out to a large position, especially when heavy items are placed inside, the front of the storage box is prone to sagging due to the lack of effective support. After long-term use, this can easily lead to wear, deformation, or even damage to the slide rails. Some existing technologies improve the sagging problem by setting fixed support feet or flip-up support components, but such structures usually require manual operation by the user or occupy a large space when folded up, which is not conducive to the smooth pushing back of the storage box. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a push-pull, labor-saving sofa bed storage structure, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A push-pull effortless sofa bed storage structure includes a bed frame and a storage box disposed inside the bed frame. The bed frame has several fixed plates inside, and slide rails are provided between the oppositely arranged fixed plates. The storage box is slidably connected to the fixed plates through the slide rails. The storage box has mounting slots on both sides, and a support component is disposed in each mounting slot. The support component includes a fixed base, a short rod, a movable base, and a long rod. The fixed base is fixedly disposed in the mounting slot, and one end of the short rod is rotatably connected to the fixed base. The storage box has sliding grooves on both sides, and the sliding grooves are connected to the mounting grooves through a through groove. A slider is slidably arranged in the through groove. The bottom of the slider is fixedly connected to a movable base. One end of the long rod is rotatably connected to the movable base, and the other end is fixedly equipped with a support wheel. The other end of the short rod is rotatably connected to the middle of the long rod, so that when the slider moves along the sliding groove, it can drive the long rod to rotate, thereby driving the support wheel to change from an inclined state to a supporting state or from a supporting state to a storage state.

[0007] Furthermore, a guide rail is provided in the slide groove, a lower rack is slidably mounted on the guide rail, a roller is provided between the guide rail and the lower rack, an upper gear is fixedly mounted on the side of the fixing plate, a second gear is rotatably mounted in the slide groove, the second gear meshes with the lower rack and cooperates with the upper gear, and the slider passes through the through groove and connects with the lower rack, so that the storage box drives the slider to move synchronously through the gear and rack transmission during the pushing and pulling process.

[0008] Furthermore, a locking assembly is provided between the slider and the storage box. The locking assembly includes a connecting block, and a slot is formed inside the connecting block. A left locking block and a right locking block are slidably disposed in the slot. Both the left and right locking blocks are provided with side racks. A gear is rotatably disposed inside the connecting block. The gear meshes with the side racks on the left and right locking blocks respectively, so that the left and right locking blocks can move synchronously. A spring is provided between the left and right locking blocks and the inner wall of the slot so that the left and right locking blocks automatically reset after the external force is released. A slot is provided on the opposite surface of the left and right locking blocks, and a bevel is provided at the end of the opposite surface of the left and right locking blocks.

[0009] Furthermore, a docking block is provided at one end of the slider near the connecting block, and a bevel is provided at the outer edge of the docking block near the connecting block. A slot is provided at one end of the docking block near the connecting block, and a T-shaped block is inserted into the slot. A spring is provided between the T-shaped block and the slider.

[0010] Furthermore, a rectangular groove is provided on the side of the storage box, and a drive rod is slidably disposed in the rectangular groove. A spring is provided between the drive rod and the rectangular groove. A linkage rod is connected to the side of the left locking block. The linkage rod passes through the right locking block and extends into the rectangular groove. Both the drive rod and the linkage rod have matching inclined surfaces at their ends to release the locking state when the drive rod slides.

[0011] Furthermore, a receiving groove is provided on the side of the fixing plate, a trapezoidal block is slidably disposed in the receiving groove, and a spring is provided between the trapezoidal block and the receiving groove.

[0012] Furthermore, the drive rod is provided with a one-way rotating rod, and the fixed plate is provided with a clearance groove for the one-way rotating rod to rotate. The one-way rotating rod only interacts with the trapezoidal block during the process of the storage box being pushed back. The end of the one-way rotating rod away from the drive rod is provided with a first inclined surface, and the end of the trapezoidal block near the one-way rotating rod is provided with a second inclined surface that cooperates with the first inclined surface. The first inclined surface and the second inclined surface are respectively provided with mutually attractive magnetic poles.

[0013] Furthermore, the support component, locking component, and one-way triggering component cooperate with each other to automatically form a support and lock the storage box during the pulling-out process, and automatically unlock and complete the storage during the pushing-back process. The entire process does not require electric, hydraulic, or pneumatic drive.

[0014] Compared with existing technologies, the advantages of this invention are: 1. This invention provides a support component that automatically unfolds as the storage box is pushed or pulled, providing support to the front end of the storage box when it is pulled out. This effectively avoids the problems of the storage box sagging and poor load-bearing stability that exist in existing sofa bed storage structures.

[0015] 2: This invention utilizes a gear-rack mechanism and a linkage flipping structure to convert the linear motion of pushing and pulling the storage box into the flipping motion of the support wheel, thereby realizing the automatic unfolding and retraction of the support wheel. It does not require electric, hydraulic or pneumatic drive, has a simple structure, saves effort in pushing and pulling, and has reliable operation.

[0016] 3: By setting up a locking component and a one-way triggering component, the present invention enables the support wheel to be stably locked after unfolding, and automatically unlocks only during the pushback of the storage box, thereby improving the stability in the supported state and the reliability of the support component recycling process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a push-pull effort-saving sofa bed storage structure proposed in this invention; Figure 2 for Figure 1 Internal structure diagram; Figure 3 for Figure 2 A schematic diagram of the structure in which the fixing plate and the storage box are used together; Figure 4 for Figure 2 A bottom view; Figure 5 for Figure 4 A cross-sectional view along the AA direction; Figure 6 for Figure 5 A structural diagram of the side of the storage box; Figure 7 for Figure 6 Schematic diagram of the medium-length rod; Figure 8 for Figure 3 Schematic diagram of the middle fixing plate; Figure 9 for Figure 1 The front view; Figure 10 for Figure 9 Cross-sectional view along the BB direction; Figure 11 for Figure 10 Enlarged structural diagram at point C; Figure 12 for Figure 10 Schematic diagram of the drive rod structure; Figure 13 for Figure 11 Enlarged structural diagram at point D; Figure 14 for Figure 11 A magnified structural diagram at point E in the middle.

[0018] In the diagram: 1. Bed frame; 11. Fixed plate; 12. Slide rail; 2. Storage box; 20. Slide groove; 21. Mounting groove; 22. Through groove; 23. Fixed seat; 24. Short rod; 25. Moving seat; 26. Long rod; 27. Support wheel; 3. Slider; 31. Connecting block; 32. Slot; 33. T-block; 34. Spring 1; 4. Connecting block; 41. Cavity; 42. Left locking block; 43. Right locking block; 44. Locking groove; 45. Side rack; 46. Gear 1; 47. Spring 2; 48. Linkage rod; 5. Lower rack; 51. Roller; 52. Guide rail; 53. Gear 2; 54. Upper gear; 55. Clearance groove; 6. Rectangular groove; 61. Drive rod; 62. One-way rotating rod; 63. Spring 3; 64. Receiving groove; 65. Trapezoidal block; 66. Spring 4. Detailed Implementation

[0019] Reference Figures 1-14 A push-pull effortless sofa bed storage structure includes a bed body 1 and a storage box 2 set inside the bed body 1. Several fixed plates 11 are set inside the bed body 1, and slide rails 12 are set between the opposite fixed plates 11. The storage box 2 is slidably connected to the fixed plates 11 through the slide rails 12, so that the storage box 2 can move back and forth relative to the bed body 1. In order to form a switchable support structure for different usage states of storage box 2, such as Figure 5 or Figure 6As shown, a support assembly consisting of a fixed base 23, a short rod 24, a long rod 26, and a support wheel 27 is provided on both sides of the storage box 2. The support assembly is located at the front end of the storage box 2 along the push-pull direction. When the storage box 2 is pulled outward, the support wheel 27 first contacts the ground, providing support for the front end of the storage box 2 to prevent the front end from sagging or wobbling in the pulled-out state. At the same time, by utilizing the large push-pull displacement of the front end of the storage box 2, the support wheel 27 can be rotated with a small transmission stroke, improving the operating efficiency and reliability of the support assembly. Mounting slots 21 are provided on both sides of the storage box 2, and a support assembly is provided in each mounting slot 21. The support assembly includes a fixed base 23, a short rod 24, a movable base 25, and a long rod 26. The fixed base 23... 3. Fixedly installed in the mounting groove 21, one end of the short rod 24 is rotatably connected to the fixed seat 23, one end of the long rod 26 is rotatably connected to the movable seat 25, and the other end is fixedly provided with a support wheel 27. The other end of the short rod 24 is rotatably connected to the middle of the long rod 26. Through the rotatable connection structure between the short rod 24 and the long rod 26, the long rod 26 can change its angle relative to the fixed seat 23, thereby driving the support wheel 27 to be in an inclined state or a supported state under different working conditions. When the slider 3 slides in the slide groove 20, the movable seat 25 fixedly connected to its bottom moves synchronously. The movable seat 25 generates displacement constraint through the rotatably connected long rod 26. Therefore, the linear motion of the movable seat 25 is converted into the rotational motion of the long rod 26 around the fixed seat 23. In order to utilize the push-pull stroke of storage box 2 to drive support wheels 27 to automatically unfold or retract, such as Figure 6 As shown, the linear motion is converted into the rotational motion of the support wheel 27 by the linkage between the slider 3 and the movable seat 25. The storage box 2 has a sliding groove 20 on both sides. The sliding groove 20 and the mounting groove 21 are connected by a through groove 22. The slider 3 is slidably arranged in the through groove 22. The bottom of the slider 3 is fixedly connected to the movable seat 25. When the slider 3 moves along the sliding groove 20, it can drive the long rod 26 to rotate through the movable seat 25, thereby driving the support wheel 27 to change from the inclined state to the supporting state, or from the supporting state to the storage state. In actual operation, when the storage box 2 moves in a push-pull motion relative to the bed frame 1, the storage box 2 does not directly drive the support wheel 27. Instead, it first drives the slider 3 to move through a gear-rack mechanism, and then the slider 3 drives the moving seat 25. The moving seat 25 drives the long rod 26 to rotate around the short rod 24, ultimately achieving a change in the posture of the support wheel 27. The long rod 26 can produce a large angle change with a small stroke of the slider 3, thereby amplifying the rotation range of the support wheel 27. Specifically, when the slider 3 moves outward along the slide groove 20, the moving seat 25 is forced to move synchronously, and one end of the long rod 26 is pulled. Under the constraint of the short rod 24, the long rod 26 rotates around the fixed seat 23, and the support wheel 27 gradually turns from an inclined state to an approximately vertical state and contacts the ground. The setting of the short rod 24 is equivalent to building an angle amplifier, so that the limited stroke of the slider 3 can complete the posture switch of the support wheel 27 from storage to support.

[0020] To ensure that the movement of the support components is synchronized with the push-pull stroke of storage box 2, such as Figures 6 to 8 As shown, a guide rail 52 is provided in the slide groove 20, and a lower rack 5 is slidably arranged on the guide rail 52. A roller 51 is arranged between the guide rail 52 and the lower rack 5. The roller 51 is used to reduce the frictional resistance when the lower rack 5 slides in the guide rail 52 and improve the smoothness of transmission. An upper gear 54 is fixedly arranged on the side of the fixing plate 11. A second gear 53 is rotatably arranged in the slide groove 20. The second gear 53 meshes with the lower rack 5 and cooperates with the upper gear 54. The slider 3 passes through the through groove 22 and connects with the lower rack 5. During the pushing and pulling process of the storage box 2, the linear motion of the storage box 2 is converted into the synchronous linear movement of the slider 3 through the gear and rack transmission mechanism composed of the upper gear 54, the second gear 53 and the lower rack 5, so as to ensure that the action of the slider 3 is consistent with the pushing and pulling stroke of the storage box 2.

[0021] In order to stably lock the working state of the support wheel 27 after it is deployed, such as Figures 10 to 14 As shown, an automatically resetting locking assembly is provided between the slider 3 and the storage box 2. The locking assembly includes a connecting block 4, which has a cavity 41 inside. A left locking block 42 and a right locking block 43 are slidably disposed in the cavity 41. Both the left locking block 42 and the right locking block 43 are provided with side racks 45. A gear 46 is rotatably disposed in the connecting block 4. The gear 46 engages with the side racks 45 on the left locking block 42 and the right locking block 43 respectively. The rack 45 engages, enabling the left locking block 42 and the right locking block 43 to move synchronously. Springs 47 are respectively provided between the left locking block 42 and the inner wall of the groove cavity 41, so that the left locking block 42 and the right locking block 43 tend to return to the center of the groove cavity 41 after the external force is released. The left locking block 42 and the right locking block 43 are provided with locking grooves 44 on their opposite surfaces, and the opposite ends of the left locking block 42 and the right locking block 43 are provided with bevels to form a guiding effect during the docking process.

[0022] To improve the smoothness of the engagement process, such as Figure 14 As shown, a docking block 31 with elastic buffer function is provided at the end of the slider 3 to realize automatic guidance and locking. The docking block 31 is provided at the end of the slider 3 near the connecting block 4. The docking block 31 is provided with a bevel near the outer edge of the connecting block 4. A slot 32 is opened at the end of the docking block 31 near the connecting block 4. A T-shaped block 33 is inserted into the slot 32. A spring 34 is provided between the T-shaped block 33 and the slider 3, so that the T-shaped block 33 can generate elastic displacement when subjected to force, thereby realizing buffering during docking and automatic displacement after unlocking.

[0023] In order to automatically disengage the locking state when the support wheel 27 needs to be retracted, such as Figures 11 to 13 As shown, a rectangular groove 6 is provided on the side of the storage box 2. A drive rod 61 is slidably arranged in the rectangular groove 6. A spring 63 is provided between the drive rod 61 and the rectangular groove 6. A linkage rod 48 is connected to the side of the left locking block 42. The linkage rod 48 extends through the right locking block 43 into the rectangular groove 6. Both the drive rod 61 and the linkage rod 48 have matching inclined surfaces at their ends. When the drive rod 61 slides in the rectangular groove 6, it pushes the linkage rod 48 to move through the inclined surfaces, thereby causing the left locking block 42 and the right locking block 43 to move outward against the elastic force of the spring 47, thus releasing the locking state.

[0024] To ensure that the unlocking action is triggered only during the pushing back of the storage box 2, and does not cause interference during the pulling out process, such as Figure 11 or Figure 12 As shown, a one-way triggering assembly is provided between the fixed plate 11 and the drive rod 61. The one-way triggering assembly includes a receiving groove 64 provided on the side of the fixed plate 11. A trapezoidal block 65 is slidably disposed in the receiving groove 64. A spring 66 is provided between the trapezoidal block 65 and the receiving groove 64 to keep the trapezoidal block 65 in its initial position when no external force is applied. A one-way rotating rod 62 is provided on the drive rod 61. A clearance groove 55 is provided on the fixed plate 11 for the one-way rotating rod 62 to rotate. A first inclined surface is provided at the end of the one-way rotating rod 62 away from the drive rod 61. A second inclined surface that cooperates with the first inclined surface is provided at the end of the trapezoidal block 65 close to the one-way rotating rod 62. Magnetic poles that attract each other are respectively provided on the first inclined surface and the second inclined surface. When the storage box 2 is pulled outward, the drive rod 61 moves synchronously with the storage box 2, and the one-way rotating rod 62 rotates in the relief groove 55. Since the relief groove 55 provides clearance space for the one-way rotating rod 62, the one-way rotating rod 62 forms an idle stroke during the pulling process and does not make effective contact with the trapezoidal block 65, thereby not triggering the displacement of the drive rod 61, and the locking component remains in the locked state. When the storage box 2 is pushed back, the one-way rotating rod 62 gradually approaches the trapezoidal block 65 under the guidance of the clearance groove 55. Under the mutual attraction of the magnetic poles on the first and second inclined surfaces, the inclined surfaces of the one-way rotating rod 62 and the trapezoidal block 65 form a stable fit before significant mechanical compression occurs. On this basis, as the storage box 2 continues to push inward, the one-way rotating rod 62, through the cooperation of the inclined surfaces, pushes the trapezoidal block 65 to overcome the elastic force of the spring 66 and move it in the receiving groove 64, thereby driving the drive rod 61 to slide in the rectangular groove 6, triggering the linkage rod 48 to act, and realizing the automatic unlocking of the locking component. After the unlocking action is completed, as the external force is released, the trapezoidal block 65 automatically resets under the action of the spring 66, the one-way rotating rod 62 returns to the initial position with the drive rod 61, and the one-way triggering component returns to the ready-to-trigger state, preparing for the next push-pull cycle. Since the magnetic pole only provides attraction during the approach phase of the inclined plane and does not undertake the main force transmission function, the initial alignment between the one-way rotating rod 62 and the trapezoidal block 65 is improved without increasing the structural complexity, avoiding insufficient contact or misalignment caused by assembly tolerances, wear or slight offset, and improving the stability and reliability of the triggering action.

[0025] To achieve automatic support, locking, and retraction of the storage box 2 without the need for electric, hydraulic, or pneumatic drives, the aforementioned structural design integrates the support components, locking components, and one-way triggering components. This allows the storage box 2 to automatically form support and lock during the pulling-out process, and automatically unlock and retract the support wheels 27 to the storage state during the pushing-back process. The entire pushing-pull and support switching process is achieved through mechanical linkage, eliminating the need for electric, hydraulic, or pneumatic drives. This not only ensures structural reliability but also effectively reduces usage resistance, improving the comfort and safety of the sofa bed storage structure.

[0026] The movement state of the storage box 2 in this invention is as follows: Initial pull-out stage: When the user pulls the storage box 2 outward, the storage box 2 moves linearly relative to the fixed plate 11. Since the upper gear 54 is fixedly installed on the side of the fixed plate 11, the upper gear 54 meshes with the gear 53 installed in the slide groove 20. Therefore, the upper gear 54 is relatively displaced relative to the gear 53. The gear 53 rotates around its own axis in the slide groove 20. The lower rack 5, which is meshed with the gear 53, slides linearly along the guide rail 52. The lower rack 5 is fixedly connected to the slider 3 through the through groove 22. Therefore, the linear movement of the lower rack 5 synchronously drives the slider 3 to slide in the slide groove 20.

[0027] The support wheel 27 flips to form the support stage: When the slider 3 slides in the groove 20, the movable seat 25 fixedly connected to its bottom moves synchronously. The movable seat 25 generates displacement constraint through the long rod 26 rotatably connected. Since the middle part of the long rod 26 is rotatably connected to the short rod 24, and the other end of the short rod 24 is rotatably connected to the fixed seat 23 fixed in the mounting groove 21, the linear motion of the movable seat 25 is converted into the rotational motion of the long rod 26 around the fixed seat 23. As the slider 3 continues to move outward, the long rod 26 gradually flips from the inclined state to the vertical state, and the support wheel 27 fixedly connected at its end moves down and contacts the ground, thereby supporting the front end of the storage box 2.

[0028] During the engagement phase: As the slider 3 slides toward the connecting block 4, the docking block 31 at one end of the slider 3 gradually enters the groove 41 inside the connecting block 4. The inclined edge on the outer side of the docking block 31 contacts the inclined edges of the left locking block 42 and the right locking block 43, causing the left locking block 42 and the right locking block 43 to move to both sides against the elastic force of the second spring 47. When the docking block 31 moves to the position of the slot 44, the second spring 47 releases its elastic force, and the left locking block 42 and the right locking block 43 return to their original positions. The slot 44 engages with the docking block 31. At this time, the slider 3 and the connecting block 4 form a relatively fixed connection, and the support wheel 27 is locked in the support state to prevent the storage box 2 from shaking when carrying heavy objects.

[0029] Initial push-back stage: When the user pushes the storage box 2 inward, the storage box 2 drives the drive rod 61 to move towards the fixed plate 11. The one-way rotating rod 62 on the drive rod 61 rotates in the clearance groove 55 and gradually approaches the receiving groove 64 on the side of the fixed plate 11.

[0030] Unlocking trigger stage: When the storage box 2 continues to be pushed inward, the one-way rotating rod 62 contacts the trapezoidal block 65 in the receiving groove 64. The inclined surfaces of the two interact with each other, causing the trapezoidal block 65 to move under the force of the spring 66. The displacement of the trapezoidal block 65 pushes the drive rod 61 to slide in the rectangular groove 6 towards the linkage rod 48. The inclined surfaces at the ends of the drive rod 61 and the linkage rod 48 cooperate with each other, causing the linkage rod 48 to drive the left locking block 42 to move. Under the meshing action of the gear 46 and the rack 45 on the upper side of the left locking block 42 and the right locking block 43, the left locking block 42 and the right locking block 43 move to both sides synchronously, thereby causing the slot 44 to disengage from the docking block 31 and completing the unlocking.

[0031] Automatic storage stage of support wheel 27: After the locking component is released, the slider 3 loses its locking constraint on the connecting block 4. Under the reverse transmission action of the gear and rack mechanism, the slider 3 moves inward with the storage box 2. The slider 3 drives the moving seat 25 to move in the opposite direction, so that the long rod 26 rotates in the opposite direction around the fixed seat 23. The support wheel 27 gradually returns from the vertical support state to the tilted storage state and re-enters the mounting groove 21. Automatic support and automatic recycling can be completed without electric, hydraulic or pneumatic drive.

[0032] 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 illustrative of the principles of 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 claimed invention.

Claims

1. A push-pull effortless sofa bed storage structure, comprising a bed frame (1) and a storage box (2) disposed inside the bed frame (1), wherein the bed frame (1) is provided with a plurality of fixed plates (11), and slide rails (12) are provided between the oppositely disposed fixed plates (11), and the storage box (2) is slidably connected to the fixed plates (11) via the slide rails (12), characterized in that: The storage box (2) has mounting slots (21) on both sides. Each mounting slot (21) is equipped with a support component. The support component includes a fixed seat (23), a short rod (24), a movable seat (25), and a long rod (26). The fixed seat (23) is fixedly installed in the mounting slot (21), and one end of the short rod (24) is rotatably connected to the fixed seat (23). The storage box (2) has sliding grooves (20) on both sides. The sliding grooves (20) and the mounting grooves (21) are connected by a through groove (22). A slider (3) is slidably arranged in the through groove (22). The bottom of the slider (3) is fixedly connected to a moving seat (25). One end of the long rod (26) is rotatably connected to the moving seat (25), and the other end is fixedly provided with a support wheel (27). The other end of the short rod (24) is rotatably connected to the middle of the long rod (26). When the slider (3) moves along the sliding groove (20), it can drive the long rod (26) to rotate, thereby driving the support wheel (27) to change from an inclined state to a supporting state or from a supporting state to a storage state.

2. The push-pull effort-saving sofa bed storage structure according to claim 1, characterized in that, A guide rail (52) is provided in the slide groove (20), and a lower rack (5) is slidably provided on the guide rail (52). A roller (51) is provided between the guide rail (52) and the lower rack (5). An upper gear (54) is fixedly provided on the side of the fixing plate (11). A second gear (53) is rotatably provided in the slide groove (20). The second gear (53) meshes with the lower rack (5) and cooperates with the upper gear (54). The slider (3) passes through the through groove (22) and connects with the lower rack (5) so that the storage box (2) drives the slider (3) to move synchronously during the push-pull process through the gear and rack transmission.

3. The push-pull effort-saving sofa bed storage structure according to claim 1, characterized in that, A locking assembly is provided between the slider (3) and the storage box (2). The locking assembly includes a connecting block (4). A cavity (41) is provided inside the connecting block (4). A left locking block (42) and a right locking block (43) are slidably arranged in the cavity (41). A side rack (45) is provided on both the left locking block (42) and the right locking block (43). A gear (46) is rotatably arranged inside the connecting block (4). The gear (46) engages with the left locking block (42) and the right locking block (43) respectively. The side rack (45) on the left and right blocks (43) are engaged, so that the left and right blocks (42) can move synchronously. The left and right blocks (43) are respectively provided with springs (47) between the left and right blocks (42) and the inner wall of the cavity (41) so that the left and right blocks (42) can automatically reset after the external force is released. The left and right blocks (43) are provided with slots (44) on the opposite surfaces of the left and right blocks (42) and the opposite ends of the left and right blocks (43) are provided with bevels.

4. The push-pull effort-saving sofa bed storage structure according to claim 3, characterized in that, The slider (3) is provided with a docking block (31) at one end near the connecting block (4). The docking block (31) is provided with a beveled edge near the outer edge of the connecting block (4). The docking block (31) is provided with a slot (32) at one end near the connecting block (4). A T-shaped block (33) is inserted into the slot (32). A spring (34) is provided between the T-shaped block (33) and the slider (3).

5. The push-pull effort-saving sofa bed storage structure according to claim 3, characterized in that, The storage box (2) has a rectangular groove (6) on its side. A drive rod (61) is slidably arranged in the rectangular groove (6). A spring (63) is arranged between the drive rod (61) and the rectangular groove (6). A linkage rod (48) is connected to the side of the left locking block (42). The linkage rod (48) extends through the right locking block (43) into the rectangular groove (6). The ends of the drive rod (61) and the linkage rod (48) are provided with matching inclined surfaces to release the locking state when the drive rod (61) slides.

6. The push-pull effort-saving sofa bed storage structure according to claim 5, characterized in that, The fixed plate (11) has a receiving groove (64) on its side, and a trapezoidal block (65) is slidably arranged in the receiving groove (64). A spring (66) is arranged between the trapezoidal block (65) and the receiving groove (64).

7. The push-pull effort-saving sofa bed storage structure according to claim 6, characterized in that, The drive rod (61) is provided with a one-way rotating rod (62), and the fixed plate (11) is provided with a relief groove (55) for the one-way rotating rod (62) to rotate. The one-way rotating rod (62) only interacts with the trapezoidal block (65) during the process of pushing the storage box (2) back. The end of the one-way rotating rod (62) away from the drive rod (61) is provided with a first inclined surface, and the end of the trapezoidal block (65) close to the one-way rotating rod (62) is provided with a second inclined surface that cooperates with the first inclined surface. The first inclined surface and the second inclined surface are respectively provided with mutually attractive magnetic poles.

8. A push-pull, labor-saving sofa bed storage structure according to any one of claims 1 to 7, characterized in that, The support component, locking component and one-way trigger component work together to enable the storage box (2) to automatically form support and lock during the pulling process, and automatically unlock and complete storage during the pushing process. The whole process does not require electric, hydraulic or pneumatic drive.

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