Hovering buffering hinge assembly

Abstract

The utility model discloses a hovering buffering hinge assembly. The upper hinge is rotatably mounted at the upper end of the lower hinge; the upper spring seat is arranged at the lower end of the upper hinge and can rotate relative to the upper hinge; the lower spring seat is mounted in the middle or at the lower end of the lower hinge; the spring is arranged between the lower spring seat and the upper spring seat; the lower spring seat is fixed in the middle or at the lower end of the lower hinge; a linear damper used for buffering is further connected between the lower spring seat and the upper spring seat. According to the refrigerator, the linear damper is additionally arranged and used for providing damping force for the process that the upper hinge rotates relative to the lower hinge, that is, the linear damper provides damping force in the process that the refrigerator door is closed and falls relative to the refrigerator body, the refrigerator door can descend slowly, and the buffering effect is achieved; and hands are prevented from being pinched due to sudden falling and closing due to self gravity.

Description

Technical fields:

[0001] This utility model relates to the technical field of hinge products, and specifically to a hovering buffer hinge assembly. Background technology:

[0002] Most horizontal refrigerator hinges on the market lack damping, requiring the user to hold the door during descent; otherwise, the door will slam shut quickly, causing a loud slam and damage, and potentially pinching the hand. Furthermore, while some horizontal refrigerator hinges offer damping for easier descent, these typically lack multi-angle stopping capabilities. This means that to stop the refrigerator door from opening, the user must either hold it or open it to its maximum angle, which is time-consuming, laborious, and inconvenient for one-handed operation.

[0003] To address the aforementioned issues, a assisted hinge, a horizontal freezer, and a working method have been proposed (application number 202210880969.7). This assisted hinge includes a hinge head, a connecting rod, a support rod, a support base, a hinge seat, and a spring. The connecting rod connects the hinge head and the support rod at both ends. When the hinge head flips, the rotating end of the connecting rod is limited by the connecting shaft on the hinge head, restricting the lid's flipping ability. When the horizontal freezer is closed, the spring is compressed and, due to the magnetic attraction, cannot push the hinge head and lid. When the lid moves, it causes the hinge head to flip upwards. The hinge head, through the first connecting shaft, drives the connecting rod to flip upwards as well. The connecting rod then drives the support rod upwards. At this point, the spring begins to extend, preventing the support seat from moving downwards, causing the spring to extend upwards. The spring washer also causes the support rod to move upwards, providing opening assistance and facilitating the opening of larger lids. When taking items out of or storing items in the horizontal freezer, the spring's assistance allows the lid to remain suspended.

[0004] However, the aforementioned assisted hinges lack cushioning, causing the lid to fall rapidly under its own weight during descent, resulting in loud closing noises and impact damage. This poses a risk of pinching hands and fails to improve the user experience.

[0005] In view of the above, the inventors propose the following technical solution. Utility Model Content:

[0006] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a hovering buffer hinge assembly.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: the hovering buffer hinge assembly includes a lower hinge, an upper hinge rotatably mounted on the upper end of the lower hinge, an upper spring seat disposed at the lower end of the upper hinge and rotatable relative to the upper hinge, a lower spring seat mounted in the middle or lower end of the lower hinge, and a spring disposed between the lower spring seat and the upper spring seat, wherein the lower spring seat is fixed in the middle or lower end of the lower hinge; a linear damper for buffering is also connected between the lower spring seat and the upper spring seat.

[0008] Furthermore, in the above technical solution, the lower end of the upper spring seat is provided with a first threaded groove, and the first external thread of the upper periphery of the linear damper is helically installed with the first threaded groove to be fixedly assembled with the upper spring seat; the upper end of the lower spring seat is provided with a second threaded groove, and the first external thread of the lower periphery of the linear damper is helically installed with the second threaded groove to be fixedly assembled with the lower spring seat.

[0009] Furthermore, in the above technical solution, the lower end of the lower spring seat is provided with a riveting groove that runs through both sides; both sides of the lower hinge are stamped and flanged to form riveting pieces, which are riveted and fixed in the riveting groove.

[0010] Furthermore, in the above technical solution, a guide rod is also fixed at the lower end of the upper spring seat; the guide rod passes through the guide hole of the lower spring seat from top to bottom and extends out of the lower end of the lower spring seat, and can slide up and down relative to the lower spring seat.

[0011] Furthermore, in the above technical solution, the upper end of the guide rod is provided with a first threaded section; the lower end of the upper spring seat is provided with a threaded hole, and the upper end of the guide rod is helically fixed to the threaded hole of the upper spring seat through the first threaded section.

[0012] Furthermore, in the above technical solution, there are two guide rods, one linear damper located between the two guide rods and distributed in parallel; and one spring sleeved on the outside of the linear damper.

[0013] Furthermore, in the above technical solution, the lower end of the upper spring seat is provided with a first recess, the upper end of the linear damper is embedded in the first groove at the bottom of the first recess, and the upper end of the spring is embedded in the second groove at the opening of the first recess. The lower outer side of the upper spring seat is also provided with several first positioning holes penetrating the second groove, and the upper end of the spring is exposed in the first positioning holes. The upper end of the lower spring seat is provided with a second recess, the lower end of the linear damper is embedded in the third groove at the bottom of the second recess, and the lower end of the spring is embedded in the fourth groove at the opening of the second recess. The upper outer side of the lower spring seat is also provided with several second positioning holes penetrating the fourth groove, and the lower end of the spring is exposed in the second positioning holes.

[0014] Furthermore, in the above technical solution, there is one guide rod, two linear dampers, and the guide rod is located between the two linear dampers and distributed in parallel; there is one spring, which is sleeved on the outside of the guide rod.

[0015] Furthermore, in the above technical solution, the upper end of the lower hinge is rotatably connected to the upper hinge via a rotating shaft, and both sides of the upper end of the lower hinge are provided with arc holes. The sliding shaft passes through the arc holes and connects with the first shaft hole at the lower end of the upper hinge and the second shaft hole of the upper spring seat, so that the upper hinge and the upper spring seat are rotatably connected. After the upper hinge rotates relative to the lower hinge, the sliding shaft slides along the arc holes and pulls the upper spring seat to rotate.

[0016] Furthermore, in the above technical solution, both sides of the upper end of the lower hinge have upwardly extending first pivot plates, and a first clearance opening is formed between the two first pivot plates for the lower end of the upper hinge and the upper spring seat to rotate; both sides of the lower end of the upper hinge have downwardly extending second pivot plates that are rotatably assembled with the first pivot plates; the middle of the lower hinge is provided with a plurality of hoist mounting holes for installation, and the lower end of the lower hinge is provided with a plurality of positioning holes, which extend downward and penetrate the lower end face of the lower hinge; the middle of the upper hinge is provided with a plurality of second mounting holes.

[0017] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0018] 1. This utility model adds a linear damper, which provides damping force to the upper hinge during the rotation of the lower hinge. That is, the linear damper provides damping force during the closing of the refrigerator door and its descent relative to the refrigerator body, enabling the refrigerator door to descend slowly, achieving a buffering effect and preventing hand injuries caused by sudden closure due to its own weight. In addition, important components such as the linear damper, spring, and lower spring seat are all installed within the lower hinge enclosure, making the structure of this utility model more compact and further reducing space requirements, which is beneficial for applications in structures with high space requirements.

[0019] 2. When the refrigerator door is closed, the spring is in a compressed state. When the refrigerator door is opened, the spring is released, generating a thrust. The direction of the force is opposite to the direction of the gravity on the refrigerator door, thus achieving the function of easy opening. Attached image description:

[0020] Figure 1 This is a perspective view of Embodiment 1 of this utility model;

[0021] Figure 2 This is a perspective view of another embodiment of the present invention;

[0022] Figure 3 This is an exploded view of Embodiment 1 of this utility model;

[0023] Figure 4 This is a perspective view of the lower spring seat in Embodiment 1 of this utility model.

[0024] Figure 5 This is a perspective view of the lower spring seat in Embodiment 2 of this utility model.

[0025] Figure 6 This is a perspective view of Embodiment 2 of this utility model;

[0026] Figure 7 This is an exploded perspective view of Embodiment 2 of this utility model;

[0027] Figure 8 This is a perspective view of Embodiment 3 of this utility model;

[0028] Figure 9 This is an exploded perspective view of Embodiment 3 of this utility model;

[0029] Figure 10 This is a perspective view of the lower spring seat in Embodiment 3 of this utility model. Detailed implementation method:

[0030] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0031] Example 1:

[0032] like Figure 1-4 As shown, a hovering buffer hinge assembly includes a lower hinge 1, an upper hinge 2, an upper spring seat 3, a lower spring seat 4, a spring 5, and a linear damper 6.

[0033] This invention can be used on refrigerators, and also on other products with flip-top / door opening and closing mechanisms (such as printers, dishwashers, etc.).

[0034] In this embodiment, the upper hinge 2 is rotatably mounted on the upper end of the lower hinge 1, the upper spring seat 3 is disposed at the lower end of the upper hinge 2 and can rotate relative to the upper hinge 2, and the lower spring seat 4 is mounted in the middle or lower end of the lower hinge 1. In this embodiment, the lower spring seat 4 is fixed in the middle or lower end of the lower hinge 1 and cannot move relative to the lower hinge 1; the spring 5 is disposed between the lower spring seat 4 and the upper spring seat 3, and the linear damper 6 is connected between the lower spring seat 4 and the upper spring seat 3. The spring 5 is sleeved on the outside of the linear damper 6.

[0035] In practical use, the lower hinge 1 is fixed to the refrigerator body, while the upper hinge 2 is fixed to the refrigerator door, making the refrigerator door hinged to the refrigerator body. This invention adds a linear damper 6, which provides damping force during the rotation of the upper hinge 2 relative to the lower hinge 1. Specifically, the linear damper 6 provides damping force during the closing and downward movement of the refrigerator door relative to the refrigerator body, allowing the refrigerator door to descend slowly, achieving a buffering effect and preventing hand injuries from sudden closure due to its own weight. Furthermore, important components such as the linear damper 6, spring 5, and lower spring seat 4 are all housed within the lower hinge enclosure, making the structure of this invention more compact and further reducing space requirements, which is beneficial for applications in structures with high space constraints. Simultaneously, when the refrigerator door is closed, the spring 5 is in a compressed state. When the refrigerator door is opened, the compression of the spring 5 is released, generating a thrust force in the opposite direction to the gravity acting on the refrigerator door, achieving a lighter opening force.

[0036] The upper spring seat 3 has a first threaded groove 301 at its lower end. The first external thread 61 on the outer periphery of the upper end of the linear damper 6 is screwed onto the first threaded groove 301 to fix it to the upper spring seat 3. The lower spring seat 4 has a second threaded groove 401 at its upper end. The second external thread 62 on the outer periphery of the lower end of the linear damper 6 is screwed onto the second threaded groove 401 to fix it to the lower spring seat 4. The linear damper 6 connects the upper spring seat 3 and the lower spring seat 4 together, and its assembly structure is extremely simple.

[0037] The lower spring seat 4 has a riveting groove 40 that runs through both sides at its lower end; both sides of the lower hinge 1 are stamped and flanged to form riveting pieces 10, which are riveted and fixed in the riveting groove 40, thereby fixing the lower spring seat 4 in the lower hinge 1. Its assembly structure is simple and easy to install, which also reduces the difficulty of assembly, reduces the assembly process, and reduces the number of parts in the hovering buffer hinge assembly, thereby reducing the overall cost of the hovering buffer hinge assembly.

[0038] The assembly structure of the lower hinge 1 and the upper hinge 2 is as follows:

[0039] The upper end of the lower hinge 1 is rotatably connected to the upper hinge 2 via a rotating shaft 13. One end of the rotating shaft 13 is provided with a second convex cap 131, and the other end is provided with a second slot 132. A second retaining spring 133 is fitted in the second slot 132. The second convex cap abuts against one side of the lower hinge 1, and the second retaining spring 133 abuts against the other side of the lower hinge 1. Its assembly structure is extremely simple.

[0040] Both sides of the upper end of the lower hinge 1 are provided with arc holes 14. The sliding shaft 15 passes through the arc holes 14 and is connected to the first shaft hole 21 at the lower end of the upper hinge 2 and the second shaft hole 32 of the upper spring seat 3, so that the upper hinge 2 and the upper spring seat 3 are rotatably connected. After the upper hinge 2 rotates relative to the lower hinge 1, the sliding shaft 15 slides along the arc holes 14 and pulls the upper spring seat 3 to rotate, making the rotation of the upper hinge 2 relative to the lower hinge 1 more stable, and limiting the angle of rotation of the upper hinge 2 relative to the lower hinge 1 to avoid excessive rotation.

[0041] The sliding shaft 15 has a third convex cap 151 at one end and a third slot 152 at the other end. A third retaining spring 153 is fitted into the third slot 152. A gasket 154 is also fitted onto the other end of the sliding shaft 15. The third retaining spring 153 abuts against the outer side of the gasket 154, the third convex cap abuts against one side of the lower hinge 1, and the inner side of the gasket 154 abuts against the other side of the lower hinge 1. This effectively prevents the sliding shaft 15 from coming off, and the assembly structure is extremely simple.

[0042] The linear damper 6 and the spring 5 are each one.

[0043] Both sides of the upper end of the lower hinge 1 have upwardly extending first pivot plates 16, and a first clearance opening 160 is formed between the two first pivot plates 16 for the lower end of the upper hinge 2 and the upper spring seat 3 to rotate. The design of the first clearance opening 160 ensures that the lower end of the upper hinge 2 and the upper spring seat 3 will not collide with the lower hinge 1 when rotating, thus ensuring the stability and smoothness of rotation. Both sides of the lower end of the upper hinge 2 have downwardly extending second pivot plates 22 that are rotatably assembled with the first pivot plates 16, which facilitates installation.

[0044] The lower hinge 1 has several hoist mounting holes 17 in the middle for installation. Screws pass through the hoist mounting holes 17 and are fixedly installed to the refrigerator body. The lower end of the lower hinge 1 has several positioning holes 18, which are embedded and positioned with the positioning part on the refrigerator body, so that the lower hinge is stably installed on the refrigerator body. The positioning holes 18 extend downward and penetrate the lower end face of the lower hinge 1. The upper hinge 2 has multiple second mounting holes 23 in the middle. Screws pass through the second mounting holes 23 and are fixedly connected to the refrigerator door. Its assembly structure is simple and stable.

[0045] In practical use, this utility model incorporates a linear damper 6. During the closing and falling process of the refrigerator door, the upper hinge 2 rotates around the rotating shaft 13, causing the upper spring seat 3 and the sliding shaft 15 to move within the arc hole 14 of the lower hinge 1. The upper spring seat 3 compresses the linear damper 6 during rotation, generating a damping force that allows the refrigerator door to fall slowly, reducing impact and creating a comfortable closing effect. The spring 5, fitted around the linear damper 6, is also compressed along with the linear damper 6 during the closing process. When the reaction force generated by the compression of the spring 5 balances the weight of the refrigerator door, the refrigerator door maintains its opening angle, achieving a hovering function. Simultaneously, the spring 5 is compressed when the refrigerator door is closed. When the refrigerator door is opened, the compression of the spring 5 is released, generating a thrust force in the opposite direction to the weight of the refrigerator door, thus achieving a light opening force.

[0046] In summary, this utility model adds a linear damper 6, which provides damping force during the rotation of the upper hinge 2 relative to the lower hinge 1. Specifically, the linear damper 6 provides damping force during the closing of the refrigerator door and its descent relative to the refrigerator body, allowing the refrigerator door to descend slowly and achieve a buffering effect, preventing hand injuries from sudden closure due to its own weight. Furthermore, important components such as the linear damper 6, spring 5, and lower spring seat 4 are all housed within the lower hinge enclosure, making the structure of this utility model more compact and further reducing space requirements, which is beneficial for applications in structures with high space constraints. Simultaneously, when the refrigerator door is closed, the spring 5 is in a compressed state. When the refrigerator door is opened, the compression of the spring 5 is released, generating a thrust force in the opposite direction to the direction of gravity acting on the refrigerator door, thus achieving a lighter opening force.

[0047] Example 2:

[0048] The difference between this second embodiment and the first embodiment described above is that: [the following is a combination of...] Figure 5-7 As shown, in this embodiment, two guide rods 7 are added, the first threaded groove 301 on the upper spring seat 3 and the second threaded groove 401 on the lower spring seat 4 are removed, and the upper and lower ends of the linear damper 6 are no longer designed with external threads, that is, the first external thread 61 and the second external thread 62 at the upper and lower ends of the linear damper 6 are removed.

[0049] The assembly structure of the linear damper 6, spring 5, upper spring seat 3, and lower spring seat 4 is as follows:

[0050] The upper spring seat 3 has a first recess 33 at its lower end. The upper end of the linear damper 6 is embedded in the first groove 331 at the bottom of the first recess 33. The upper end of the spring 5 is embedded in the second groove 332 at the opening of the first recess 33. The lower outer side of the upper spring seat 3 also has several first positioning holes 34 penetrating the second groove 332, with the upper end of the spring 5 exposed in the first positioning holes 34. The assembly structure is stable and easy to install. The lower spring seat 4 has a second recess 43 at its upper end. The lower end of the linear damper 6 is embedded in the third groove 431 at the bottom of the second recess 43. The lower end of the spring 5 is embedded in the fourth groove 432 at the opening of the second recess 43. The upper outer side of the lower spring seat 4 also has several second positioning holes 433 penetrating the fourth groove 432, with the lower end of the spring 5 exposed in the second positioning holes 433. The assembly structure is stable and easy to install.

[0051] Two guide rods 7 fix the lower end of the upper spring seat 3 and are distributed on both sides of the linear damper 6. That is, there are two guide rods 7 and one linear damper 6. The linear damper 6 is located between the two guide rods 7 and is distributed in parallel. There is one spring 5, which is sleeved on the outside of the linear damper 6.

[0052] The guide rod 7 passes through the guide hole 42 of the lower spring seat 4 from top to bottom and extends out of the lower end of the lower spring seat 4, and can slide up and down relative to the lower spring seat 4.

[0053] The upper end of the guide rod 7 is provided with a first threaded section 71; the lower end of the upper spring seat 3 is provided with a threaded hole 31, and the upper end of the guide rod 7 is screwed to the threaded hole 31 of the upper spring seat 3 through the first threaded section 71.

[0054] The guide rod 7 serves as a guide, enabling the upper spring seat 3 to partially move downwards during the rotation relative to the lower hinge 1. At this time, through the assembly relationship between the guide rod 7 and the guide hole 42 of the lower spring seat 4, the partial downward movement of the upper spring seat 3 can be ensured to be smoother and more stable, so as to better compress the spring 5 and the linear damper 6.

[0055] Apart from the above, the other structures of this embodiment two are the same as those of the other structures of embodiment one, and can achieve the same technical effects as embodiment one, which will not be described in detail here.

[0056] Example 3:

[0057] The difference between this embodiment three and the above embodiment two is that: [combination] Figure 8-10As shown, this embodiment also has a guide rod 7, and the number of linear dampers 6 is increased. In this embodiment, there is one guide rod 7 and two linear dampers 6. The guide rod 7 is located between the two linear dampers 6 and is distributed in parallel. There is one spring 5, which is sleeved on the outside of the guide rod 7.

[0058] In this third embodiment, the first sink 33 has no second sink body 332 and no first positioning port 34; the second sink 43 has no fourth sink body 432 and no second positioning port 44.

[0059] This embodiment uses two linear dampers 6, which provides better damping effect. The damping force of the hovering buffer hinge assembly is provided by the spring 5 and the two linear dampers 6. When the required damping value is determined, since there are two linear dampers 6, the stiffness of the spring 5 can be smaller, that is, the outer diameter of the spring 5 can be reduced, which allows the depth of the hovering buffer hinge assembly to be reduced, which is beneficial for applications in refrigerators with high installation space requirements.

[0060] Apart from the above, the other structures of this embodiment three are the same as those of the other structures of embodiment two, and can achieve the same technical effects as embodiment two, which will not be described in detail here.

[0061] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A hovering buffer hinge assembly, comprising a lower hinge (1), an upper hinge (2) rotatably mounted on the upper end of the lower hinge (1), an upper spring seat (3) disposed at the lower end of the upper hinge (2) and rotatable relative to the upper hinge (2), a lower spring seat (4) mounted in the middle or at the lower end of the lower hinge (1), and a spring (5) disposed between the lower spring seat (4) and the upper spring seat (3), characterized in that: The lower spring seat (4) is fixed to the middle or lower end of the lower hinge (1); A linear damper (6) for buffering is also connected between the lower spring seat (4) and the upper spring seat (3).

2. The hovering buffer hinge assembly according to claim 1, characterized in that: The upper spring seat (3) is provided with a first threaded groove (301) at its lower end. The first external thread (61) on the outer periphery of the upper end of the linear damper (6) is screwed onto the first threaded groove (301) to be fixedly assembled with the upper spring seat (3). The lower spring seat (4) is provided with a second threaded groove (401) at its upper end. The second external thread (62) on the outer periphery of the lower end of the linear damper (6) is screwed onto the second threaded groove (401) to be fixedly assembled with the lower spring seat (4).

3. A hovering buffer hinge assembly according to claim 1, characterized in that: The lower spring seat (4) is provided with a riveting groove (40) that runs through both sides; both sides of the lower hinge (1) are stamped and flanged to form riveting pieces (10), which are riveted and fixed in the riveting groove (40).

4. A hovering buffer hinge assembly according to claim 1, characterized in that: The lower end of the upper spring seat (3) is also fixed with a guide rod (7); the guide rod (7) passes through the guide hole (42) of the lower spring seat (4) from top to bottom and extends out of the lower end of the lower spring seat (4), and can slide up and down relative to the lower spring seat (4).

5. A hovering buffer hinge assembly according to claim 4, characterized in that: The guide rod (7) has a first threaded section (71) at its upper end; the upper spring seat (3) has a threaded hole (31) at its lower end, and the upper end of the guide rod (7) is screwed to the threaded hole (31) of the upper spring seat (3) through the first threaded section (71).

6. A hovering buffer hinge assembly according to claim 4, characterized in that: There are two guide rods (7) and one linear damper (6). The linear damper (6) is located between the two guide rods (7) and is distributed in parallel. There is one spring (5), which is sleeved on the outside of the linear damper (6).

7. A hovering buffer hinge assembly according to claim 5, characterized in that: The upper spring seat (3) has a first recess (33) at its lower end. The upper end of the linear damper (6) is embedded in the first groove (331) at the bottom of the first recess (33). The upper end of the spring (5) is embedded in the second groove (332) at the opening of the first recess (33). The lower outer side of the upper spring seat (3) also has several first positioning holes (34) that penetrate the second groove (332). The upper end of the spring (5) is also exposed in the first positioning holes (34). The lower spring seat (4) is provided with a second recess (43) at its upper end. The lower end of the linear damper (6) is embedded in the third groove (431) at the bottom of the second recess (43). The lower end of the spring (5) is embedded in the fourth groove (432) at the opening of the second recess (43). The upper outer side of the lower spring seat (4) is also provided with several second positioning ports (433) that penetrate the fourth groove (432). The lower end of the spring (5) is also exposed in the second positioning ports (433).

8. A hovering buffer hinge assembly according to claim 4, characterized in that: The guide rod (7) is one in number, the linear damper (6) is two in number, the guide rod (7) is located between the two linear dampers (6) and is distributed in parallel; the spring (5) is one in number, which is sleeved on the outside of the guide rod (7).

9. A hovering buffer hinge assembly according to any one of claims 1-8, characterized in that: The upper end of the lower hinge (1) is rotatably connected to the upper hinge (2) via a rotating shaft (13). Both sides of the upper end of the lower hinge (1) are provided with arc holes (14). The sliding shaft (15) passes through the arc holes (14) and is connected to the first shaft hole (21) at the lower end of the upper hinge (2) and the second shaft hole (32) of the upper spring seat (3), so that the upper hinge (2) and the upper spring seat (3) are rotatably connected. After the upper hinge (2) rotates relative to the lower hinge (1), the sliding shaft (15) slides along the arc holes (14) and pulls the upper spring seat (3) to rotate.

10. A hovering buffer hinge assembly according to any one of claims 1-8, characterized in that: The lower hinge (1) has two upwardly extending first pivot plates (16) on both sides of its upper end, and a first clearance opening (160) is formed between the two first pivot plates (16) for the lower end of the upper hinge (2) and the upper spring seat (3) to rotate; the upper hinge (2) has two downwardly extending second pivot plates (22) on both sides of its lower end that are rotatably assembled with the first pivot plates (16); the lower hinge (1) has a plurality of hoist mounting holes (17) in the middle for installation, and the lower end of the lower hinge (1) has a plurality of positioning holes (18) that extend downward and penetrate the lower end face of the lower hinge (1); the upper hinge (2) has a plurality of second mounting holes (23) in the middle.

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