Folding hinge
By incorporating precise designs of components such as the main pivot, limit plate, limit rod, and spring-loaded assembly into the folding hinge, the problem of the difficulty in changing the limit state of traditional hinges is solved, enabling flexible rotation and diversified limit control of the hinge, thus improving ease of use and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN MINGSHI DOOR IND TECH CO LTD
- Filing Date
- 2025-04-24
- Publication Date
- 2026-04-17
AI Technical Summary
Existing folding hinge devices have significant shortcomings in terms of canceling and restoring the limit function. Once a traditional hinge is installed, the limit state is difficult to change, and ordinary users cannot easily disassemble or modify it to cancel the limit.
A folding hinge was designed, which uses a main pivot, a limiting plate, a limiting rod, a spring-loaded assembly, and a limit release assembly. The limit function can be selectively canceled and restored through clearance fit and sliding structure. The hinge includes the precise fit of components such as the first hinge, the second hinge, the limiting circular plate, the spring-loaded module, the L-shaped buckle, the spring spring, and the control switch.
It achieves precise limit positioning of the hinge at 90-degree and 180-degree angles, and the limit can be easily canceled or restored through the operation control switch, meeting the diverse needs of different usage scenarios, improving ease of use and flexibility, and extending the service life of the hinge.
Smart Images
Figure CN224134451U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hinge technology, and in particular to a folding hinge. Background Technology
[0002] In the current field of mechanical connection components, folding hinges are widely used as key elements for enabling flexible opening and closing of objects. While existing folding hinges can provide 90-degree and 180-degree angle limiting functions to meet the fixed requirements of unfolded and folded states in specific scenarios, the drawback of the inability to eliminate these limiting functions becomes increasingly apparent in some applications. When users only need the hinge to open and close freely without limiting constraints, traditional hinges are insufficient. Against this technological backdrop, this patent, with its unique and ingenious mechanical design, innovatively achieves the selective elimination of the limiting function, expanding new possibilities for the application of folding hinges.
[0003] Existing folding hinge devices have significant shortcomings in terms of canceling and restoring the limiting function. Typically, traditional hinges with limiting structures are fixed designs, and once installed, their limiting state is difficult to change. To cancel the limiting function, additional tools are often required to disassemble or modify the hinge structure, making the operation extremely cumbersome and almost impossible for ordinary users to perform themselves. Therefore, we propose a folding hinge to solve the aforementioned problems. Utility Model Content
[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.
[0005] Therefore, the purpose of this utility model is to provide a folding hinge that can solve the significant shortcomings of existing folding hinge devices in terms of canceling and restoring the limiting function. Typically, traditional hinges with limiting structures are mostly fixed designs, and once installed, their limiting state is difficult to change. To cancel the limiting function, additional tools are often needed to disassemble or modify the hinge structure, making the operation extremely cumbersome, a problem that is almost impossible for ordinary users to complete themselves.
[0006] To solve the above-mentioned technical problems, this utility model provides a folding hinge, which adopts the following technical solution: it includes a first hinge, a second hinge, a main rotating shaft, a limiting circular plate, and a spring-loaded limiting release component. The first hinge and the second hinge are respectively provided with shaft mounting holes adapted to the installation of the main rotating shaft. The two main rotating shafts are axially movable in the shaft mounting holes on the corresponding sides in a clearance fit manner, thereby establishing an axial connection relationship between the first hinge and the second hinge that can rotate relative to each other. The left and right edges of the first hinge are bent upwards by a cold bending integral bending process to form a limiting plate integral with the first hinge. The width of the first hinge is smaller than that of the second hinge and is nested in the internal space of the second hinge. Through the specific limiting release component, the limiting function can be canceled, and when limiting is required, it can be restored to the normal limiting state.
[0007] Optionally, the second hinge has a circular limiting plate integrally formed at both ends, which is coaxial with the shaft mounting hole; the circular limiting plate has a first limiting slot for angle limiting at the top, left and bottom, with the first limiting slot at the top being the shallowest, which is designed to limit the hinge with a small force when it is closed, so that it can be opened without pressing the control switch.
[0008] Optionally, the limiting plate is provided with a first limiting groove and a second limiting groove; the first limiting groove is located directly in front of the second limiting groove, both of which are straight groove structures, and the length and width of the grooves are consistent; the second limiting groove is arranged at an angle of 45° backwards relative to the horizontal direction, and the setting of the second limiting groove on the limiting plates on the left and right sides of the first hinge is strictly mirror symmetrical.
[0009] Optionally, a first limiting rod is movably installed inside the first limiting groove via a sliding fit; a second limiting rod is also movably installed inside the second limiting groove via a sliding fit; a spring-loaded control block is installed through the first and second limiting rods, and bidirectional displacement constraint is achieved through axial limiting; a control switch is integrally formed at the rear of the spring-loaded control block.
[0010] Optionally, a plurality of locking protrusions are arranged in a regular array on the front of the first hinge plane; a return spring is connected between the first limiting rod and the locking protrusions, and the two ends of the return spring are respectively firmly fixed to the first limiting rod and the locking protrusions; the return spring applies a stable force to the first limiting rod through its own elastic deformation, so that the first limiting rod can reciprocate within the first limiting groove; when the second hinge rotates to 90 degrees, 180 degrees or a specific angle of complete closure, under the action of the return spring, the first limiting rod can slide into the corresponding first limiting slot on the circular limiting plate, thereby realizing the limiting function of the hinge.
[0011] Optionally, the rebound limit release assembly includes a rebound module, an L-shaped buckle, a rebound spring, a control switch, and a force transmission rod. The rebound module has two symmetrically distributed L-shaped buckles axially connected and mounted inside via pins. The corners of the L-shaped buckles are rotatably connected to the inside of the rebound module via pins. A rebound spring is installed directly behind each buckle via a fastening connection. A sloping gap with a specific gradient is provided between the two buckles. A switch groove is provided directly above the rebound module, and the control switch is slidably mounted within the switch groove. The tail of the control switch extends into the rebound module and can directly apply force to the rebound spring through the sloping gap.
[0012] Optionally, the left and right ends of the spring-loaded module are provided with clearance holes of the same size and shape; a limiting circular plate is axially connected to the outer side of the second hinge through the main rotating shaft, and the limiting circular plate is coaxial with the rotation axis of the first hinge and the second hinge; the size of the limiting circular plate is the same as that of the circular limiting plate, and a second limiting slot is provided on the limiting circular plate, and the second limiting slot does not completely penetrate the limiting circular plate, and a C-shaped groove is provided inside the limiting circular plate.
[0013] Optionally, a force transmission rod is movably installed inside the C-shaped slot via a sliding fit, with the head of the force transmission rod confined inside the C-shaped slot; the tail of the force transmission rod is connected to the inside of the rebound module, and the tail of the force transmission rod is provided with an adapter slot that precisely matches the shape of the buckle head; a return spring is installed directly below the tail of the force transmission rod via a limiting structure; the left and right ends are mirror-symmetrical about the rebound module, the limiting circular plate, and the force transmission rod.
[0014] Optionally, the main rotating shaft and the shaft mounting hole adopt a clearance fit. The outer diameter of the main rotating shaft is designed to be precisely smaller than the inner diameter of the shaft mounting hole according to the standard tolerance zone, so as to ensure the flexibility of the hinge rotation. The outer diameter of the first limiting rod is designed to be consistent with the groove width of the first limiting slide, the groove width of the first limiting slot opened on the circular limiting plate, and the groove width of the second limiting slot opened on the limiting circular plate, and the tolerance is controlled within a very small range, so as to achieve precise sliding and limiting fit of the first limiting rod in each corresponding structure.
[0015] In summary, this utility model has at least one of the following beneficial effects: 1. By installing a series of components, including a main pivot, a limiting plate, a circular limiting plate, a limiting rod, a spring-loaded assembly, and a limiting release assembly, in the folding hinge structure, a complete and multifunctional hinge system is constructed. This achieves the effect that the hinge can rotate flexibly, be precisely limited at specific angles of 90 degrees and 180 degrees, and conveniently cancel the limiting by operating a control switch. This meets the diverse needs for hinge opening and closing states and angle fixation in different usage scenarios, greatly improving the convenience and flexibility of hinge use.
[0016] 2. By precisely designing the dimensional fit of each component, such as the clearance fit between the main rotating shaft and the shaft mounting hole, and the high-precision dimensional matching between the first limit rod and the first limit slide groove, as well as each limit slot, the coordinated operation of all moving parts of the hinge is ensured. This achieves smooth and flexible hinge rotation, as well as precise sliding and positioning of the limit rod within each limit structure, guaranteeing the reliability and stability of the hinge's limit function, extending the hinge's service life, and improving the overall product performance. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model in a 90-degree open and closed state with no limit.
[0020] Figure 3 This is a schematic diagram of the left front structure of the present invention in its overall closed and limited state.
[0021] Figure 4 This is a schematic diagram of the overall opening and closing 180-degree limit state of this utility model;
[0022] Figure 5 This is a cross-sectional view of the springback limit release component and related parts of this utility model in both working and non-working states.
[0023] Figure 6 This is an enlarged schematic diagram of the axis of a partial component of this utility model and the first and second hinges;
[0024] Figure 7 For the present utility model Figure 5Enlarged diagram of points A and B in the middle;
[0025] Figure 8 This is a schematic diagram of the left rear structure of the present invention in its overall closed and limited state.
[0026] Explanation of reference numerals in the attached drawings: 1. First hinge; 2. Second hinge; 3. Main shaft; 4. Limiting circular plate; 5. Springback limit release assembly; 6. Shaft mounting hole; 7. Limiting plate; 8. Circular limiting plate; 9. First limiting slot; 10. First limiting slide groove; 11. Second limiting slide groove; 12. First limiting rod; 13. Second limiting rod; 14. Springback control block; 15. Control switch; 16. Locking protrusion; 17. Return spring; 18. Springback module; 19. L-shaped buckle; 20. Springback spring; 21. Control switch; 22. Force transmission rod; 23. Pin; 24. Inclined gap; 25. Switch slide groove; 26. Clearance hole; 27. Second limiting slot; 28. C-shaped groove; 29. Return spring; 30. Adaptor slot. Detailed Implementation
[0027] The following is in conjunction with the appendix Figure 1-8 The present invention will be described in further detail below.
[0028] Example 1, refer to Figure 1-8 In this embodiment, the present invention addresses the significant shortcomings of existing folding hinge devices in terms of canceling and restoring the limiting function. Typically, traditional hinges with limiting structures are fixed designs, and once installed, their limiting state is difficult to change. Canceling the limiting function often requires additional tools to disassemble or modify the hinge structure, a very cumbersome process that is almost impossible for ordinary users to complete themselves. This invention discloses a folding hinge...
[0029] The system includes a first hinge 1, a second hinge 2, a main pivot 3, a limiting circular plate 4, and a spring-loaded limiting release component 5. The first hinge 1 and the second hinge 2 each have shaft mounting holes 6 adapted to accommodate the installation of the main pivot 3. The two main pivots 3 are axially mounted in the corresponding shaft mounting holes 6 with a clearance fit, thus establishing a rotatable axial connection between the first hinge 1 and the second hinge 2. The left and right edges of the first hinge 1 are bent upwards using a cold-bending integrated bending process to form a limiting plate 7 integrated with the first hinge 1. The width of the first hinge 1 is smaller than that of the second hinge 2, and it is nested within the internal space of the second hinge 2. A specific limiting release component can cancel the limiting function; when limiting is required... It can also restore the normal limiting state. By installing two main rotating shafts 3 that are axially movable in the corresponding shaft mounting holes 6 of the first hinge 1 and the second hinge 2 with a clearance fit, an axial connection relationship that allows the two to rotate relative to each other is established, so that the hinges can rotate flexibly and achieve a smooth opening and closing effect. By using a cold bending integrated bending process to form limiting plates 7 on the left and right edges of the first hinge 1, and the width of the first hinge 1 is smaller than that of the second hinge 2 and they are nested in it, the stability and compactness of the hinge structure are enhanced. By setting a specific spring-loaded limiting release component 5, the limiting function can be flexibly canceled and the limiting function can be restored when needed, so as to meet the limiting needs of diverse use scenarios.
[0030] The second hinge 2 has circular limiting plates 8 integrally formed at both ends, coaxial with the shaft mounting holes 6. First limiting slots 9 for angle limiting are formed at the top, left, and bottom of the circular limiting plates 8. The top first limiting slot 9 is the shallowest, designed to limit the hinge with minimal force when closed, allowing it to open without pressing the control switch 15. By integrally forming circular limiting plates 8 coaxial with the shaft mounting holes 6 at both ends of the second hinge 2, and forming first limiting slots 9 at the top, left, and bottom of the circular limiting plates 8, the purpose of providing precise angle limiting for the folding hinge is achieved. The shallowest first limiting slot 9 at the top enables the hinge to be opened with minimal force when closed, eliminating the need to press the control switch 15 and optimizing the user experience. The limiting slots at other locations provide reliable limiting at specific angles of 90 degrees and 180 degrees, meeting the needs of hinge angle fixation in different usage scenarios.
[0031] The limiting plate 7 has a first limiting groove 10 and a second limiting groove 11. The first limiting groove 10 is located directly in front of the second limiting groove 11. Both are straight groove structures, and the length and width of the grooves are consistent. The second limiting groove 11 is arranged at a precise backward tilt of 45° relative to the horizontal direction. The second limiting groove 11 is set on the limiting plates 7 on both sides of the first hinge 1 in a strictly mirror-symmetrical manner. By opening the first limiting groove 10 and the second limiting groove 11 on the limiting plate 7, and placing the first limiting groove 10 directly in front of the second limiting groove 11, adopting a straight groove structure and maintaining consistent groove dimensions, and arranging the second limiting groove 11 at a precise backward tilt of 45°, and making it mirror-symmetrical on the limiting plates 7 on both sides of the first hinge 1, the purpose of providing a precise movement track for the first limiting rod 12 and the second limiting rod 13 is achieved. This technology enables precise control of the hinge rotation angle during hinge rotation through the cooperation of two limit rods and the slide groove, enhancing the stability and reliability of hinge positioning and achieving accurate positioning of the hinge in different angle positioning scenarios.
[0032] A first limiting rod 12 is movably installed inside the first limiting slide groove 10 via a sliding fit; a second limiting rod 13 is also movably installed inside the second limiting slide groove 11 via a sliding fit; a spring-loaded control block 14 is installed through the first limiting rod 12 and the second limiting rod 13, achieving bidirectional displacement constraint through axial limiting; a control switch 15 is integrally formed behind the spring-loaded control block 14. By movably installing the first limiting rod 12 and the second limiting rod 13 via a sliding fit in the first limiting slide groove 10 and the second limiting slide groove 11 respectively, and by installing the spring-loaded control block 14 through the two rods to achieve bidirectional displacement constraint through axial limiting, and by integrally forming the control switch 15 behind the spring-loaded control block 14, the hinge's limiting and resetting functions can be precisely controlled. This allows the user to easily and quickly reset the hinge by simply pressing the control switch 15 when it is in the limiting state, improving the flexibility and convenience of hinge use.
[0033] Several locking protrusions 16 are arranged in a regular array on the front of the first hinge 1. A return spring 17 is connected between the first limiting rod 12 and the locking protrusions 16, and the two ends of the return spring 17 are firmly fixed to the first limiting rod 12 and the locking protrusions 16 respectively. The return spring 17 applies a stable force to the first limiting rod 12 through its own elastic deformation, so that the first limiting rod 12 can reciprocate within the first limiting groove 10. When the second hinge 2 rotates to 90 degrees, 180 degrees or a specific angle of complete closure, the first limiting rod 12 can slide into the corresponding first limiting groove 9 on the circular limiting plate 8 under the action of the return spring 17, realizing the limiting function of the hinge. By arranging several locking protrusions 16 in a regular array on the front of the first hinge 1 and connecting the first limiting rod 12 and the locking protrusions 16 with the return spring 17 firmly fixed at both ends, the purpose of providing a stable force to the first limiting rod 12 is achieved. By utilizing the elastic deformation of the return spring 17, the first limiting rod 12 reciprocates within the first limiting groove 10. When the second hinge 2 rotates to a specific angle of 90 degrees, 180 degrees, or is fully closed, the first limiting rod 12 is precisely pushed into the corresponding first limiting slot 9 on the circular limiting plate 8, thereby achieving a reliable limiting function for the hinge at different angles and meeting diverse usage needs.
[0034] The springback limit release assembly 5 includes a springback module 18, L-shaped buckles 19, a springback spring 20, a control switch 21, and a force transmission rod 22. The springback module 18 has two symmetrically distributed L-shaped buckles 19 axially connected to it via pins 23. The corners of the L-shaped buckles 19 are rotatably connected to the inside of the springback module 18 via pins 23. A springback spring 20 is fastened to the rear of each buckle. A sloped gap 24 is provided between the two buckles. A switch groove 25 is provided above the springback module 18. The control switch 21 is slidably installed in the switch groove 25, and its tail extends into the springback module 18. The spring-loaded spring 20 can be directly subjected to force through the angled gap 24. A spring-loaded limit release assembly 5, comprising a spring-loaded module 18, L-shaped buckles 19, a spring-loaded spring 20, a control switch 21, and a force transmission rod 22, is used. Within the spring-loaded module 18, symmetrically distributed L-shaped buckles 19 are axially connected by pins 23, with their corners rotatably connected to the module. The spring-loaded spring 20 is securely installed directly behind the buckles. An angled gap 24 with a specific slope is provided between the two buckles. A switch groove 25 is provided directly above the spring-loaded module 18, and the control switch 21 is slidably installed within it, allowing its tail to act on the spring-loaded spring 20 through the angled gap 24. This achieves flexible control of the hinge's limit release and restoration. The user can operate the control switch 21, utilizing the elasticity of the spring-loaded spring 20 and the rotation of the L-shaped buckles 19 to precisely transmit force, thereby conveniently canceling or restoring the hinge's limit function, improving the flexibility and ease of use of the hinge.
[0035] Both ends of the spring-loaded module 18 have clearance holes 26 of the same size and shape. The outer side of the second hinge 2 is axially connected to and installed with a limiting circular plate 4 via the main rotating shaft 3. The limiting circular plate 4 is coaxial with the rotation axis of the first hinge 1 and the second hinge 2. The size of the limiting circular plate 4 is the same as that of the circular limiting plate 8. The limiting circular plate 4 has a second limiting slot 27, which does not completely penetrate the limiting circular plate 4. The limiting circular plate 4 has a C-shaped slot 28 inside. By opening clearance holes 26 of the same size and shape at both ends of the spring-loaded module 18, space is provided for the movement of related components, avoiding interference and ensuring the smooth operation of the device as a whole, thereby improving the stability and reliability of the device. By axially connecting and installing a limiting circular plate 4 coaxial with the rotation axis of the first and second hinges on the outside of the second hinge 2 via the main rotating shaft 3, and by providing a second limiting slot 27 that is not completely through and an internal C-shaped slot 28, the limiting circular plate 4 is sized to match the circular limiting plate 8 and has an internal C-shaped slot 28. This achieves the purpose of assisting in the hinge limiting and limiting release functions, and enables precise control of the movement of the first limiting rod 12 by cooperating with the circular limiting plate 8 component, thereby flexibly switching the hinge limiting state.
[0036] A force transmission rod 22 is movably installed inside the C-shaped slot 28 via a sliding fit. The head of the force transmission rod 22 is confined inside the C-shaped slot 28. The tail of the force transmission rod 22 is connected to the inside of the spring-loaded module 18, and the tail of the force transmission rod 22 is provided with an adapter groove 30 that precisely matches the shape of the buckle head. A return spring 29 is installed directly below the tail of the force transmission rod 22 via a limiting structure. The left and right ends are mirror-symmetrical with respect to the spring-loaded module 18, the limiting circular plate 4, and the force transmission rod 22. By movably installing the force transmission rod 22 in the C-shaped slot 28 via a sliding fit and confining its head inside the C-shaped slot 28, while the tail of the force transmission rod 22 is connected to the inside of the spring-loaded module 18 and provided with an adapter groove 30 that precisely matches the buckle head, and the return spring 29 is installed directly below the tail of the force transmission rod 22 via a limiting structure, and the left and right ends are mirror-symmetrical, the purpose of accurately transmitting force and flexibly switching between hinge limit and limit release is achieved. When the control switch 21 is operated, the force transmission rod 22 slides in the C-shaped slot 28 and works in conjunction with the buckle and return spring 29 to accurately transmit the force of the return spring 20, drive the limit plate 4 to rotate, thereby changing the position of the limit slot, realizing the cancellation or restoration of the hinge limit function, and ensuring the stable and reliable operation of the device.
[0037] The main shaft 3 and the shaft mounting hole 6 are fitted with a clearance fit. The outer diameter of the main shaft 3 is designed to be precisely smaller than the inner diameter of the shaft mounting hole 6 according to the standard tolerance zone to ensure the flexibility of the hinge rotation. The outer diameter of the first limiting rod 12 is designed to be consistent with the groove width of the first limiting slide 10, the groove width of the first limiting slot 9 opened on the circular limiting plate 8, and the groove width of the second limiting slot 27 opened on the limiting circular plate 4, with the tolerance controlled within a very small range. This allows the first limiting rod 12 to slide and limit the fit precisely within its corresponding structure. By using a clearance fit between the main shaft 3 and the shaft mounting hole 6, and with the outer diameter of the main shaft 3 designed to be smaller than the inner diameter of the shaft mounting hole 6 according to the standard tolerance zone, the flexibility of the hinge rotation is ensured, enabling the hinge to rotate smoothly and seamlessly, meeting the needs of frequent opening and closing. By designing the outer diameter of the first limiting rod 12 to be consistent with the groove width of the first limiting slide groove 10, the groove width of the first limiting slot 9 on the circular limiting plate 8, and the groove width of the second limiting slot 27 on the limiting circular plate 4, and strictly controlling the tolerance within a very small range, the purpose of achieving precise sliding and limiting cooperation of the first limiting rod 12 in each corresponding structure is realized. This enables the hinge to be accurately limited and released at different angles, thereby improving the positioning accuracy and stability of the hinge.
[0038] Limit function cancellation process: When the limit function cancellation operation of the folding hinge needs to be performed, the user applies a backward force to the control switch 21, pushing the control switch 21 to slide along a predetermined trajectory within the switch slide groove 25. During the sliding process, the tail of the control switch 21 contacts the return spring 20 and applies pressure to it. After being compressed, the return spring 20, through the inclined gap 24 between the two L-shaped latches 19, uses the lever principle to drive the two symmetrically distributed latches to rotate around the pin 23. As the latches rotate, their tails disengage from the force transmission rod 22 and no longer apply pressure to the force transmission rod 22. At this time, the force transmission rod 22, which was originally constrained by the latch pressure, moves forward along the C-shaped slot 28 under the elastic restoring force of the return spring 29. The forward movement of the force transmission rod 22 drives the connected limit plate 4 to rotate around the main rotating shaft 3. After rotation, the positions of the second limiting slot 27 on the limiting circular plate 4 and the first limiting slot 9 on the circular limiting plate 8 change, and they are no longer in a corresponding engagement state. Since the first limiting rod 12 moves between the first limiting slide 10, the first limiting slot 9 of the circular limiting plate 8, and the second limiting slot 27 of the limiting circular plate 4, when the rotation of the limiting circular plate 4 causes its second limiting slot 27 to be in a different position from the first limiting slot 9 of the circular limiting plate 8, the first limiting rod 12 cannot slide into the originally corresponding first limiting slot 9 and second limiting slot 27 under the action of the return spring 17, thus successfully canceling the folding hinge limiting function.
[0039] Limit Function Restoration Process: When it is necessary to restore the limit function of the folding hinge, it can be achieved in two equivalent ways. First, apply a backward force directly to the force transmission rods 22 on both sides. Under this external force, the force transmission rods 22 overcome the elastic force of the return spring 29 and move backward along the C-shaped groove 28. The backward movement of the force transmission rods 22 causes the connected limit circular plate 4 to rotate in the opposite direction around the main rotating shaft 3, so that the second limit slot 27 on the limit circular plate 4 and the first limit slot 9 on the circular limit plate 8 are repositioned in their corresponding engagement positions. Second, apply a counterclockwise rotational external force directly to the limit circular plates 4 at both ends; under this external force, the limit circular plates 4 rotate counterclockwise around the main rotating shaft 3, causing the connected force transmission rods 22 to overcome the elastic force of the return spring 29 and move backward along the C-shaped groove 28. Regardless of the method used, the second limiting slot 27 on the limiting circular plate 4 and the first limiting slot 9 on the circular limiting plate 8 can ultimately be restored to their corresponding engagement state. When the second hinge 2 rotates to 90 degrees, 180 degrees, or a specific angle of complete closure, the first limiting rod 12, under the action of the return spring 17, can smoothly slide into the corresponding first limiting slot 9 on the circular limiting plate 8 and the corresponding second limiting slot 27 on the limiting circular plate 4, thereby restoring the limiting function of the folding hinge. After completing the above operations to make the limiting slots of the limiting circular plate 4 and the circular limiting plate 8 correspondingly engage, the force transmission rod 22, during its backward movement, will have its tail end fitted with a matching slot 30 that precisely matches the shape of the buckle head, re-engage with the L-shaped buckle 19. This restoration of engagement relationship allows the entire spring-loaded limiting release assembly 5 to return to a stable working state, laying the foundation for subsequent possible cancellation and restoration operations of the limiting function, ensuring the reliability and stability of the folding hinge limiting system.
[0040] The specific working principle is as follows: By installing a series of components such as the main rotating shaft 3, limiting plate 7, circular limiting plate 8, limiting rod, spring-loaded assembly, and limiting release assembly in the folding hinge structure, a complete and multifunctional hinge system is constructed. This allows the hinge to rotate flexibly, be precisely limited at specific angles of 90 degrees and 180 degrees, and easily cancel the limiting by operating the control switch 21. This meets the diverse needs for hinge opening and closing states and angle fixation in different usage scenarios, greatly improving the convenience and flexibility of hinge use. Through precise design of the dimensional fit of each component, such as the clearance fit between the main rotating shaft 3 and the shaft mounting hole 6, and the high-precision dimensional matching between the first limiting rod 12 and the first limiting slide groove 10, as well as each limiting slot, the coordinated operation of all moving parts of the hinge is ensured. This achieves smooth and flexible hinge rotation, and precise sliding and positioning of the limiting rod within each limiting structure, ensuring the reliability and stability of the hinge's limiting function, extending the hinge's service life, and improving the overall product performance.
[0041] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.
Claims
1. A folding hinge, comprising a first hinge (1), a second hinge (2), a main pivot (3), a limiting circular plate (4), and a spring-back limiting release assembly (5), characterized in that: The first hinge (1) and the second hinge (2) are respectively provided with shaft mounting holes (6) adapted to the installation of the main rotating shaft (3). The two main rotating shafts (3) are axially installed in the corresponding shaft mounting holes (6) on both sides in a clearance fit manner, thereby constructing an axial connection relationship between the first hinge (1) and the second hinge (2) that can rotate relative to each other. The left and right edges of the first hinge (1) are bent upward by a cold bending integral bending process to form a limiting plate (7) integral with the first hinge (1). The width of the first hinge (1) is smaller than that of the second hinge (2) and is nested in the internal space of the second hinge (2). The limiting function can be canceled by a specific limiting release component. When the limiting is required, the normal limiting state can be restored.
2. A folding hinge as claimed in claim 1, wherein: The second hinge (2) has a circular limiting plate (8) integrally formed at both ends, which is coaxial with the shaft mounting hole (6); the circular limiting plate (8) is provided with a first limiting slot (9) for angle limiting at the top, left and bottom, with the first limiting slot (9) at the top being the shallowest, which is intended to limit the hinge with a small force when it is closed, so that it can be opened without pressing the control switch (15).
3. A folding hinge as claimed in claim 2, wherein: The limiting plate (7) is provided with a first limiting groove (10) and a second limiting groove (11); the first limiting groove (10) is located directly in front of the second limiting groove (11). Both of them are straight groove structures, and the length and width of the grooves are consistent. The second limiting groove (11) is arranged at an angle of 45° backward relative to the horizontal direction, and the setting of the second limiting groove (11) on the limiting plate (7) on the left and right sides of the first hinge (1) is strictly mirror symmetrical.
4. A folding hinge according to claim 3, wherein: The first limiting groove (10) is movably installed with a first limiting rod (12) by sliding fit; the second limiting groove (11) is also movably installed with a second limiting rod (13) by sliding fit; a spring-loaded control block (14) is installed through the first limiting rod (12) and the second limiting rod (13), and bidirectional displacement constraint is achieved by axial limiting; a control switch (15) is integrally formed at the rear of the spring-loaded control block (14).
5. A folding hinge according to claim 4 wherein: The first hinge (1) has several locking protrusions (16) arranged in a regular array on its front side. A return spring (17) is connected between the first limiting rod (12) and the locking protrusions (16). The two ends of the return spring (17) are firmly fixed to the first limiting rod (12) and the locking protrusions (16) respectively. The return spring (17) applies a stable force to the first limiting rod (12) through its own elastic deformation, so that the first limiting rod (12) can reciprocate within the first limiting groove (10). When the second hinge (2) rotates to 90 degrees, 180 degrees or a specific angle of complete closure, the first limiting rod (12) can slide into the corresponding first limiting slot (9) on the circular limiting plate (8) under the action of the return spring (17), thereby realizing the limiting function of the hinge.
6. The folding hinge of claim 1, wherein: The rebound limit release assembly (5) includes a rebound module (18), an L-shaped buckle (19), a rebound spring (20), a control switch (21), and a force transmission rod (22). The rebound module (18) is axially connected to the L-shaped buckles (19) which are symmetrically distributed on the left and right sides through a pin (23). The corners of the L-shaped buckles (19) are rotatably connected to the inside of the rebound module (18) through the pin (23). The rebound spring (20) is installed behind the buckle by a fastening connection. A slant gap (24) with a specific slope is provided between the two buckles. A switch groove (25) is provided on the top of the rebound module (18). The control switch (21) is installed in the switch groove (25) in a sliding fit. The tail of the control switch (21) extends into the inside of the rebound module (18) and can directly apply force to the rebound spring (20) through the slant gap (24).
7. A folding hinge as claimed in claim 6, wherein: The spring-loaded module (18) has clearance holes (26) of the same size and shape at both ends; the second hinge (2) is axially connected to a limiting circular plate (4) via the main rotating shaft (3) on the outside, and the limiting circular plate (4) is coaxial with the rotation axis of the first hinge (1) and the second hinge (2); the size of the limiting circular plate (4) is the same as that of the circular limiting plate (8), and the limiting circular plate (4) has a second limiting slot (27) on it, and the second limiting slot (27) does not completely penetrate the limiting circular plate (4), and the limiting circular plate (4) has a C-shaped slot (28) inside it.
8. A folding hinge according to claim 7, wherein: A force transmission rod (22) is movably installed inside the C-shaped slot (28) by sliding fit. The head of the force transmission rod (22) is limited to the inside of the C-shaped slot (28). The tail of the force transmission rod (22) is connected to the inside of the spring module (18), and the tail of the force transmission rod (22) is provided with a matching slot (30) that is precisely adapted to the shape of the buckle head. A return spring (29) is installed directly below the tail of the force transmission rod (22) by a limiting structure. The structures of the left and right ends with respect to the spring module (18), the limiting circular plate (4), and the force transmission rod (22) are mirror symmetrical.
9. The folding hinge of claim 4, wherein: The main rotating shaft (3) and the shaft mounting hole (6) are fitted with a clearance fit. The outer diameter of the main rotating shaft (3) is designed to be precisely smaller than the inner diameter of the shaft mounting hole (6) according to the standard tolerance zone, so as to ensure the flexibility of the hinge rotation. The outer diameter of the first limiting rod (12) is designed to be consistent with the groove width of the first limiting slide (10), the groove width of the first limiting slot (9) opened on the circular limiting plate (8), and the groove width of the second limiting slot (27) opened on the limiting circular plate (4), and the tolerance is controlled within a very small range, so as to achieve precise sliding and limiting fit of the first limiting rod (12) in each corresponding structure.