A sofa bed board support toughness strip and its use method

Abstract

The present invention relates to the field of home furnishing technology, specifically a sofa bed support toughness bar and a method for using the same, comprising a support bar, a plurality of positioning bars fixedly connected to the upper end surface of the support bar, a plurality of evenly distributed expansion slots formed in the support bar, an elastic hose provided in the expansion slot, one end of the elastic hose fixedly connected to the support bar, a first spring provided in the elastic hose, the first spring fixedly connected to the support bar, and a expansion block fixedly connected to the other end of the elastic hose. The present invention can effectively buffer the pressure exerted on the sofa bed by cooperating with the plurality of elastic hoses and the plurality of first springs in the support bar and a U-shaped plate, thereby reducing the stress on the support bar through buffering, reducing damage and deformation of the support bar due to external forces, preventing deformation or breakage of the sofa bed due to long-term gravity, and improving the service life of the support bar.

Description

Technical Field

[0001] The invention relates to a sofa bed supporting toughness strip, in particular to a sofa bed board supporting toughness strip and a use method thereof, belonging to the technical field of home soft furnishings. Background Art

[0002] With the continuous development of society, people's quality of life is constantly improving, and people's requirements for living environment are also gradually increasing, especially sofa beds, which occupy a relatively large proportion of the home. Sofa beds refer to dual-purpose furniture that can be used as sofas and beds. Modern home furnishings tend to be fashionable and simple, and multifunctional furniture is becoming more and more the choice of the public. Sofa beds are one of their main products. In small-sized rooms, a sofa bed is very necessary to meet the living needs of occasional visitors.

[0003] During the use of sofa beds, most of the time they are used as sofas, and occasionally as beds for rest, to provide residents or visitors with a comfortable resting experience. When using a sofa bed, each person's weight and sitting method are different, which will cause the sofa bed to be subjected to different degrees of pressure. If the support effect of the sofa bed is not good, it will cause the sofa bed to be damaged to varying degrees. Long-term use will cause the sofa bed to deform, resulting in reduced user comfort, or even more serious breakage, causing the sofa bed to be unable to be used normally. Summary of the Invention

[0004] The purpose of the present invention is to provide a sofa bed board support toughness strip and a method for using the same, which can effectively buffer the pressure exerted on the sofa bed by using multiple elastic hoses and multiple first springs in the support strip in conjunction with the U-shaped plate, thereby reducing the stress on the support strip through buffering, reducing the damage and deformation of the support strip due to external forces, preventing the sofa bed from being deformed or broken due to long-term gravity, and improving the service life of the support strip.

[0005] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0006] A sofa bed support toughness bar comprises a support bar, wherein the upper end surface of the support bar is fixedly connected to a plurality of positioning bars, the support bar is provided with a plurality of evenly distributed expansion slots, an elastic hose is provided in the expansion slot, one end of the elastic hose is fixedly connected to the support bar, a first spring is provided in the elastic hose, the first spring is fixedly connected to the support bar, the other end of the elastic hose is fixedly connected to a expansion block, and the lower end surface of the expansion block is fixedly connected to the other end of the first spring;

[0007] The inner walls of the plurality of telescopic slots are each provided with two corresponding limit slots, and the two limit slots are each provided with a limit block, and the plurality of limit blocks are slidably connected to the support bar and fixedly connected to the telescopic block, and the upper end faces of the plurality of telescopic blocks are fixedly connected to a fixed column, and the upper end faces of the plurality of fixed columns are fixedly connected to a U-shaped plate, and the U-shaped plate is slidably connected to the support bar

[0008] Preferably, two lifting blocks are symmetrically fixedly connected to the upper surface of the U-shaped plate, the two lifting blocks are connected to a connecting block toward the corresponding side, a spring bar is fixedly connected between the two connecting blocks, and a locking block is fixedly connected to the side of the two connecting blocks away from the spring bar, and the lifting block is slidably connected to the multiple positioning bars.

[0009] Preferably, two evenly distributed card slots are provided in each of the two lifting blocks, and a plurality of card slots are movably connected with card blocks, and a plurality of card blocks are movably connected to the two lifting blocks. An endurance plate is placed on the spring bar, and both ends of the endurance plate are fixedly connected to the plurality of card blocks.

[0010] Preferably, movable grooves are provided at both ends of the support bar, guide rods are provided in the two movable grooves, second springs are sleeved on the two guide rods, one end of the two second springs is fixedly connected to a moving block, the upper end surfaces of the two moving blocks are fixedly connected to two support rods, the upper ends of the two support rods are fixedly connected to the end surface of the U-shaped plate, and the moving block is slidably connected to the guide rods and to the support bar.

[0011] Preferably, locking grooves are provided in the two lifting blocks, and screw buttons are screwed onto the two locking blocks, and the screw buttons pass through the lifting blocks and the locking blocks.

[0012] Preferably, two movable grooves are provided in the support bar, the two movable grooves are located on both sides of the plurality of telescopic grooves, and the U-shaped plate is slidably connected to the support bar.

[0013] Preferably, a plurality of the positioning bars are provided with convex grooves, and a plurality of the convex grooves are provided with convex blocks, and the convex blocks are fixedly connected to the lifting block and slidably connected to the positioning bars.

[0014] Preferably, both ends of the two support bars are fixedly connected with retaining blocks, and two retaining holes are provided on the two retaining blocks.

[0015] Preferably, the endurance board is made of polycarbonate.

[0016] A method for using a sofa bed board support toughness strip comprises the following steps:

[0017] S1: First, fix the support bar to the main frame of the sofa bed through the retaining holes on the retaining blocks at both ends of the support bar to ensure a stable connection between the support bar and the main body of the sofa bed. Then, insert the locking blocks on one side of the connecting blocks at both ends of the spring bar into the locking grooves in the two lifting blocks. Use the locking buttons to fix the two locking blocks in the two lifting blocks respectively to fix the spring bar to the two lifting blocks. Then, insert the two clamping blocks at both ends of the endurance board into the clamping grooves in the two lifting blocks to connect the endurance board to the lifting blocks.

[0018] S2: After the support bar is completely connected to the main body of the sofa bed, when the endurance board is subjected to pressure, it will bend and deform, squeezing the spring bar at the bottom of the endurance board. Due to its own elasticity, the spring bar will buffer the pressure exerted by the endurance board. At this time, the two lifting blocks will slide downward on the two opposite positioning bars under the action of pressure. During the sliding process, multiple protrusions will assist the lifting blocks in moving on the two opposite positioning bars, preventing the lifting blocks from deviating and shaking, which will affect the vertical movement trajectory of the lifting blocks;

[0019] S3: The lifting block is fixedly connected to the U-shaped plate. When the multiple protrusions assist the lifting block to move downward, the U-shaped plate will also move downward and move into the moving groove in the support bar. During the downward movement of the U-shaped plate, the two support rods on the lower end surface of the U-shaped plate will squeeze the moving block downward, so that the moving block forms an extrusion platform for the second spring. The second spring can help the spring bar to effectively buffer the gravity exerted on the endurance plate. At the same time, the guide rod can guide and limit the moving direction of the moving block to ensure that the second spring will not be deformed or skewed during the compression and buffering process.

[0020] S4: When the second spring buffers the upper pressure, when the U-shaped plate moves downward, it will also squeeze the multiple fixed columns, causing the multiple fixed columns to move downward with the multiple telescopic blocks. During the downward movement of the multiple telescopic blocks, the multiple elastic hoses and the multiple first springs are squeezed, causing the multiple first elastic hoses and the multiple first springs to buffer the remaining pressure, which can greatly reduce the damage to the support bar caused by the upper pressure of the endurance plate;

[0021] S5: After the pressure buffering is completed, the multiple telescopic blocks move upward with the multiple fixed columns in conjunction with the rebound force of the multiple first springs and the multiple elastic hoses, so that the U-shaped plate bounces upward. When the U-shaped plate bounces upward, the second spring will also assist the multiple first springs and the multiple elastic hoses to rebound, so that the U-shaped plate and the spring bars between the two lifting blocks can achieve an amplitude of a certain frequency, thereby realizing the effect of buffering force.

[0022] The present invention has at least the following beneficial effects:

[0023] 1. The multiple elastic hoses and multiple first springs in the support bar cooperate with the U-shaped plate to effectively buffer the pressure on the sofa bed. By buffering, the stress on the support bar is reduced, and the damage and deformation of the support bar caused by external force is reduced. The problem of deformation or breakage of the sofa bed caused by long-term gravity is prevented, the toughness of the support bar is improved, and its service life is increased.

[0024] 2. Under the action of the spring bar and the endurance board, the gravity is buffered, thereby reducing the pressure on the U-shaped plate. In conjunction with the use of the second spring and the first spring, the gravity borne by the endurance board is vibrated at a certain frequency to buffer the gravity on the sofa bed. This can effectively buffer and release the gravity and improve the overall toughness of the support bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 It is an isometric structural diagram of the present invention;

[0027] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0028] Figure 3 is a three-dimensional cross-sectional view of the present invention;

[0029] Figure 4 For the present invention Figure 3 Enlarged view of point B in the middle;

[0030] Figure 5 This is an isometric structural diagram of the present invention. Figure 2 ;

[0031] Figure 6 For the present invention Figure 5 Enlarged view of point C in the middle;

[0032] Figure 7 This is an isometric structural diagram of the present invention. Figure 3 ;

[0033] Figure 8 For the present invention Figure 7 Enlarged view of point D in the middle;

[0034] Figure 9 This is an isometric structural diagram of the present invention. Figure 4 .

[0035] In the figure, 1. support bar; 2. positioning bar; 11. telescopic slot; 12. elastic hose; 13. first spring; 14. telescopic block; 21. limiting slot; 22. limiting block; 23. fixing column; 24. U-shaped plate; 31. lifting block; 32. connecting block; 33. spring bar; 34. locking block; 41. card slot; 42. card block; 43. endurance plate; 51. movable slot; 52. guide rod; 53. second spring; 54. moving block; 55. support rod; 61. locking slot; 62. screw button; 71. moving slot; 81. convex slot; 91. convex block; 101. retaining block; 102. retaining hole. DETAILED DESCRIPTION

[0036] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0037] like Figures 1-9 As shown, the sofa bed board support toughness bar provided in this embodiment includes a support bar 1 that can effectively support the entire sofa bed to prevent collapse. The upper end surface of the support bar 1 is fixedly connected to a plurality of positioning bars 2. A plurality of evenly distributed telescopic grooves 11 are opened in the support bar 1. An elastic hose 12 is provided in the telescopic groove 11. One end of the elastic hose 12 is fixedly connected to the support bar 1. A first spring 13 is provided in the elastic hose 12. The first spring 13 is fixedly connected to the support bar 1. The plurality of elastic hoses 12 and the plurality of first springs 13 can play an effective buffering role. The other end of the elastic hose 12 is fixedly connected to a telescopic block 14. The lower end surface of the telescopic block 14 is fixedly connected to the other end of the first spring 13, which can make good use of the elastic hose 12. The telescopic block 14 buffers and releases gravity, and two corresponding limit grooves 21 are provided on the inner walls of the multiple telescopic slots 11. Limit blocks 22 are provided in the two limit grooves 21. The multiple limit blocks 22 are slidably connected to the support bar 1 and fixedly connected to the telescopic block 14. The limit blocks 22 can limit the telescopic block 14 to prevent the telescopic block 14 from being stuck in the telescopic slot 11 and unable to move when moving up and down, thereby affecting the normal effect. The upper end surfaces of the multiple telescopic blocks 14 are fixedly connected to fixed columns 23, and the upper end surfaces of the multiple fixed columns 23 are fixedly connected to U-shaped plates 24. The U-shaped plates 24 are slidably connected to the support bar 1, and the U-shaped plates 24 can squeeze the multiple fixed columns 23 so that the fixed columns 23 move with the telescopic block 14;

[0038] Further, such as Figure 1 、 Figure 2 、 Figure 4 as well as Figure 8As shown, two movable grooves 71 are provided in the support bar 1. The two movable grooves 71 are located on both sides of the multiple telescopic grooves 11. The U-shaped plate 24 is slidably connected to the support bar 1. The use of the U-shaped plate 24 and the movable grooves 71 allows the U-shaped plate 24 to have sufficient movable space in the support bar 1, so that the U-shaped plate 24 can squeeze the multiple elastic hoses 12 and the multiple springs downward to buffer and release force.

[0039] Further, if Figure 2 、 Figure 4 as well as Figure 8 As shown, two lifting blocks 31 are symmetrically fixedly connected to the upper surface of the U-shaped plate 24, and the two lifting blocks 31 are connected to a connecting block 32 on the corresponding side. A spring bar 33 is fixedly connected between the two connecting blocks 32, and a locking block 34 is fixedly connected to the side away from the spring bar 33 of the two connecting blocks 32. The locking block 34 can realize preliminary connection and fixation between the two ends of the spring bar 33 and the two lifting blocks 31. The lifting block 31 is slidably connected to the multiple positioning bars 2. Locking grooves 61 are provided in the two lifting blocks 31. Screw buttons 62 are screwed on the two locking blocks 34. The screw buttons 62 pass through the lifting block 31 and the locking block 34, and then cooperate with the screw buttons 62 to form a stable type between the locking block 34 and the lifting block 31. The spring bar 33 will not fall off from the two lifting blocks 31 due to the gravity of the spring bar 33, thereby improving the stability of the spring bar 33 during use.

[0040] Furthermore, if Figure 1 and Figure 2 As shown, two evenly distributed card slots 41 are provided in each of the two lifting blocks 31, and card blocks 42 are movably connected in the multiple card slots 41. The multiple card blocks 42 are movably connected to the two lifting blocks 31. An endurance plate 43 is placed on the spring bar 33. Both ends of the endurance plate 43 are fixedly connected to the multiple card blocks 42. Through the multiple card blocks 42, the endurance plate 43 can be quickly connected to the lifting block 31. At the same time, the endurance plate 43 is made of polycarbonate and has good bending and toughness.

[0041] In addition, if Figure 2 and Figure 6 As shown, multiple positioning bars 2 are provided with convex grooves 81, and multiple convex grooves 81 are provided with convex blocks 91. The convex blocks 91 are fixedly connected to the lifting block 31 and are slidably connected to the positioning bar 2. The two convex blocks 91 can assist the lifting block 31 in sliding in the positioning bar 2, preventing the lifting block 31 from escaping from the two relative positioning bars when moving, and can well limit the lifting block 31 to ensure that the lifting block 31 can only move up and down;

[0042] Furthermore, if Figure 2 、 Figure 6 and Figure 8As shown, movable grooves 51 are opened at both ends of the support bar 1, and guide rods 52 are provided in the two movable grooves 51. The guide rods 52 can play a good role in guiding and limiting. Second springs 53 are sleeved on the two guide rods 52, and one end of the two second springs 53 is fixedly connected to a moving block 54. With the use of the second spring 53 and the moving block 54, the moving block 54 can be squeezed by the guide rod 52 to form an extrusion on the second spring 53, or the moving block 54 is limited to move when the spring rebounds. The upper end surfaces of the two moving blocks 54 are fixedly connected to two support rods 55, and the upper ends of the two support rods 55 are fixedly connected to the end surface of the U-shaped plate 24. The moving block 54 is slidably connected to the guide rods 52 and the support bar 1, so that the two support rods 55 can support the U-shaped plate 24 under the action of the second spring 53, or squeeze the moving block 54 through the U-shaped plate 24 to shrink the second spring 53.

[0043] Among them, Figure 1 and Figure 2 As shown, both ends of the two support bars 1 are fixedly connected with retaining blocks 101, and two retaining holes 102 are provided on the two retaining blocks 101. The retaining holes 102 on the retaining blocks 101 can be used to effectively fix the entire support bar 1, ensuring that the support bar 1 and the sofa body can be fully fixed and supported.

[0044] like Figures 1-9 As shown, the method for using the sofa bed support toughness strip provided in this embodiment includes the following steps:

[0045] S1: First, fix the support bar 1 to the main frame of the sofa bed through the retaining holes 102 on the retaining blocks 101 at both ends of the support bar 1 to ensure that the support bar 1 is stably connected to the main body of the sofa bed and the stability of the support bar 1. Then, insert the locking blocks 34 on one side of the connecting blocks 32 at both ends of the spring bar 33 into the locking grooves 61 in the two lifting blocks 31. Use the locking buttons to fix the two locking blocks 34 in the two lifting blocks 31 respectively, so that the spring bar 33 is fixed to the two lifting blocks 31. Then, insert the two clamping blocks 42 at both ends of the endurance plate 43 into the clamping slots 41 in the two lifting blocks 31 to connect the endurance plate 43 to the lifting blocks 31.

[0046] S2: After the support bar 1 is completely connected to the main body of the sofa bed, when the endurance plate 43 is subjected to pressure, it will bend and deform, squeezing the spring bar 33 at the bottom of the endurance plate 43. Due to its own elasticity, the spring bar 33 will buffer the pressure applied by the endurance plate 43. At this time, the two lifting blocks 31 will slide downward on the two opposite positioning bars 2 under the action of pressure. During the sliding process, the multiple protrusions 91 will assist the lifting blocks 31 in moving on the two opposite positioning bars 2, preventing the lifting blocks 31 from deviating and shaking, which will affect the vertical movement trajectory of the lifting blocks 31;

[0047] S3: The lifting block 31 is fixedly connected to the U-shaped plate 24. When the multiple protrusions 91 assist the lifting block 31 to move downward, the U-shaped plate 24 will also move downward and move into the moving groove 71 in the support bar 1. During the downward movement of the U-shaped plate 24, the two support rods 55 on the lower end surface of the U-shaped plate 24 will squeeze the moving block 54 downward, so that the moving block 54 forms an extrusion platform for the second spring 53. The second spring 53 can help the spring bar 33 to effectively buffer the gravity exerted on the endurance plate 43. At the same time, the guide rod 52 can guide and limit the moving direction of the moving block 54 to ensure that the second spring 53 will not be deformed or skewed during the compression and buffering process.

[0048] S4: When the second spring 53 buffers the upper pressure, the U-shaped plate 24 moves downward, which also squeezes the multiple fixed columns 23, causing the multiple fixed columns 23 to move downward with the multiple telescopic blocks 14. During the downward movement of the multiple telescopic blocks 14, the multiple elastic hoses 12 and the multiple first springs 13 are squeezed, causing the multiple first elastic hoses 12 and the multiple first springs 13 to buffer the remaining pressure, which can greatly reduce the damage to the support bar 1 caused by the upper pressure of the endurance plate 43;

[0049] S5: After the pressure buffering is completed, the multiple telescopic blocks 14 move upward with the multiple fixed columns 23 in cooperation with the rebound force of the multiple first springs 13 and the multiple elastic hoses 12, so that the U-shaped plate 24 bounces upward. When the U-shaped plate 24 bounces upward, the second spring 53 will also assist the multiple first springs 13 and the multiple elastic hoses 12 to rebound, so that the U-shaped plate 24 and the spring bar 33 between the two lifting blocks 31 can achieve an amplitude of a certain frequency, thereby realizing the effect of buffering force.

[0050] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0051] It should be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0052] The foregoing description shows and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept described herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A sofa bed support toughness strip, comprising a support strip, characterized in that: The upper end surface of the support bar is fixedly connected to a plurality of positioning bars, a plurality of evenly distributed telescopic slots are opened in the support bar, an elastic hose is provided in the telescopic slot, one end of the elastic hose is fixedly connected to the support bar, a first spring is provided in the elastic hose, the first spring is fixedly connected to the support bar, the other end of the elastic hose is fixedly connected to a telescopic block, and the lower end surface of the telescopic block is fixedly connected to the other end of the first spring; The inner walls of the plurality of telescopic slots are each provided with two corresponding limit slots, and the two limit slots are each provided with a limit block, and the plurality of limit blocks are slidably connected to the support bar and fixedly connected to the telescopic block, and the upper end surfaces of the plurality of telescopic blocks are fixedly connected to a fixed column, and the upper end surfaces of the plurality of fixed columns are fixedly connected to a U-shaped plate, and the U-shaped plate is slidably connected to the support bar. The method for using the sofa bed board support toughness strip includes the following steps: S1: First, fix the support bar to the main frame of the sofa bed through the retaining holes on the retaining blocks at both ends of the support bar to ensure a stable connection between the support bar and the main body of the sofa bed and the stability of the support bar. Then, insert the locking blocks on one side of the connecting blocks at both ends of the spring bar into the locking grooves in the two lifting blocks. Use the locking buttons to fix the two locking blocks in the two lifting blocks respectively to fix the spring bar to the two lifting blocks. Then, insert the two clamping blocks at both ends of the endurance board into the clamping grooves in the two lifting blocks to connect the endurance board to the lifting blocks. S2: After the support bar is completely connected to the main body of the sofa bed, when the endurance board is subjected to pressure, it will bend and deform, squeezing the spring bar at the bottom of the endurance board. Due to its own elasticity, the spring bar will buffer the pressure exerted by the endurance board. At this time, the two lifting blocks will slide downward on the two opposite positioning bars under the action of pressure. During the sliding process, multiple protrusions will assist the lifting blocks in moving on the two opposite positioning bars, preventing the lifting blocks from deviating and shaking, which will affect the vertical movement trajectory of the lifting blocks; S3: The lifting block is fixedly connected to the U-shaped plate. When the multiple protrusions assist the lifting block to move downward, the U-shaped plate will also move downward and move into the moving groove in the support bar. During the downward movement of the U-shaped plate, the two support rods on the lower end surface of the U-shaped plate will squeeze the moving block downward, so that the moving block forms an extrusion platform for the second spring. The second spring can help the spring bar to effectively buffer the gravity exerted on the endurance plate. At the same time, the guide rod can guide and limit the moving direction of the moving block to ensure that the second spring will not be deformed or skewed during the compression and buffering process. S4: When the second spring buffers the upper pressure, when the U-shaped plate moves downward, it will also squeeze the multiple fixed columns, causing the multiple fixed columns to move downward with the multiple telescopic blocks. During the downward movement of the multiple telescopic blocks, the multiple elastic hoses and the multiple first springs are squeezed, causing the multiple first elastic hoses and the multiple first springs to buffer the remaining pressure, which can greatly reduce the damage to the support bar caused by the upper pressure of the endurance plate; S5: After the pressure buffering is completed, the multiple telescopic blocks move upward with the multiple fixed columns in conjunction with the rebound force of the multiple first springs and the multiple elastic hoses, so that the U-shaped plate bounces upward. When the U-shaped plate bounces upward, the second spring will also assist the multiple first springs and the multiple elastic hoses to rebound, so that the U-shaped plate and the spring bars between the two lifting blocks can achieve an amplitude of a certain frequency, thereby realizing the effect of buffering force.

2. The sofa bed support toughness strip according to claim 1, characterized in that: Two lifting blocks are symmetrically fixedly connected to the upper surface of the U-shaped plate, and the two lifting blocks are connected to a connecting block on the corresponding side. A spring bar is fixedly connected between the two connecting blocks, and a locking block is fixedly connected to the side of the two connecting blocks away from the spring bar. The lifting block is slidably connected to the multiple positioning bars.

3. The sofa bed support toughness strip according to claim 2, characterized in that: Two evenly distributed card slots are provided in each of the two lifting blocks, and card blocks are movably connected in multiple card slots. Multiple card blocks are movably connected to the two lifting blocks. An endurance plate is placed on the spring bar, and both ends of the endurance plate are fixedly connected to multiple card blocks.

4. The sofa bed support toughness strip according to claim 3, characterized in that: Movable grooves are provided at both ends of the support bar, and guide rods are provided in the two movable grooves. A second spring is sleeved on the two guide rods, and one end of the two second springs is fixedly connected to a moving block. The upper end surfaces of the two moving blocks are fixedly connected to two support rods, and the upper ends of the two support rods are fixedly connected to the end surface of the U-shaped plate. The moving block is slidably connected to the guide rod and the support bar.

5. The sofa bed support toughness strip according to claim 4, characterized in that: A locking groove is provided in each of the two lifting blocks, and screw buttons are screwed onto the two locking blocks, and the screw buttons pass through the lifting block and the locking block.

6. The sofa bed support toughness strip according to claim 5, characterized in that: Two movable grooves are provided in the support bar, and the two movable grooves are located on both sides of the plurality of telescopic grooves. The U-shaped plate is slidably connected to the support bar.

7. The sofa bed support toughness strip according to claim 6, characterized in that: A plurality of positioning bars are provided with convex grooves, and a plurality of convex grooves are provided with convex blocks. The convex blocks are fixedly connected to the lifting blocks and are slidably connected to the positioning bars.

8. The sofa bed support toughness strip according to claim 7, characterized in that: Both ends of the two support bars are fixedly connected with retaining blocks, and two retaining holes are provided on the two retaining blocks.

9. The sofa bed support toughness strip according to claim 8, characterized in that: The endurance board is made of polycarbonate.

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