A toothless hinge for foldable screen electronic devices

Abstract

This utility model relates to a toothless rotating shaft for foldable screen electronic devices, comprising a first substrate and a second substrate, two connecting shafts, and a movable substrate. Each connecting shaft is fitted with a first return spring, the two ends of which act on the movable substrate and the second substrate, respectively. A flipping assembly is provided between the first substrate and the movable substrate. The flipping assembly includes a base block, a lifting slider, a rotating part, and a connecting part. The rotating part includes a rotating cylinder and a mounting plate. The connecting part includes a first connecting rod, a second connecting rod, and a transmission rod. During the folding and rotating process of either side of the foldable screen, the rotating cylinder and connecting shafts rotate, the first connecting rod and rotating cylinder rotate, and the second connecting rod and lifting slider rotate to drive the lifting slider to descend. Simultaneously, the lifting slider drives the other side of the foldable screen to fold and rotate during its descent. This utility model has an ingenious structure and is convenient and practical.

Description

Technical Field

[0001] This utility model relates to the field of foldable screen hinges, and in particular to a toothless hinge for foldable screen electronic devices. Background Technology

[0002] With the rapid development of display technology, foldable screen electronic devices (such as foldable phones and tablets) are increasingly favored by the market because they can combine large screens with portability. One of the core components of these devices is the hinge mechanism that enables the screen to bend. The performance of the hinge directly determines the opening and closing feel of the device, screen crease control, and overall lifespan.

[0003] In existing technologies, most foldable screen hinges employ gear transmission structures to achieve synchronous flipping of the two screens. These structures typically include multiple meshing gears mounted on the hinge, using the gear ratio to ensure synchronized movement of the two screens at a specific angle. However, gear transmission structures have some inherent drawbacks: First, gears inevitably generate operating noise during meshing, affecting the user experience; second, after prolonged use, gears are prone to wear, leading to transmission gaps, which can cause asynchronous screen flipping, a loose opening / closing feel, and in severe cases, even damage to the brittle flexible screen; third, the precision gear structure requires extremely high machining accuracy and assembly processes, increasing manufacturing costs and process complexity, making it quite inconvenient. Summary of the Invention

[0004] The purpose of this invention is to provide a toothless rotating shaft for foldable screen electronic devices. It has an ingenious structure that eliminates the need for gears and achieves synchronous rotation of the foldable screen by setting a flipping component, which is efficient and convenient.

[0005] The technical solution to achieve the purpose of this utility model is as follows: This utility model has a first substrate and a second substrate arranged opposite to each other, two connecting shafts arranged opposite to each other for connecting the first substrate and the second substrate, and a movable substrate arranged between the first substrate and the second substrate. The movable substrate is arranged parallel to the first substrate and the second substrate and is slidably connected to each connecting shaft. A first return spring is sleeved on each connecting shaft. Each first return spring is located between the movable substrate and the second substrate, and the two ends of each first return spring act on the movable substrate and the second substrate respectively. A flipping assembly for synchronous flipping of a folding screen is provided between the first substrate and the movable substrate. The flipping assembly includes a base block that can be fixedly installed on the keel of an electronic device, a lifting slider that is slidably connected to the base block, a rotating part that is rotatably connected to each connecting shaft, and a connecting part for connecting the lifting slider and the rotating part. The rotating parts on each connecting shaft are arranged opposite to each other and rotate... The component includes a rotating cylinder sleeved and rotatably connected to a corresponding connecting shaft, and a mounting plate integrally formed with the rotating cylinder and connectable to a corresponding folding screen. The movable base plate is pressed against the rotating cylinder by the continuous force of each first return spring. The connecting part includes a first connecting rod rotatably connected to the rotating cylinder, a second connecting rod rotatably connected to the lifting slider, and a transmission rod for connecting the first connecting rod and the second connecting rod. The axes of the first connecting rod and the second connecting rod are both parallel to the axis of the connecting shaft. During the folding and rotation process, the folding screen mounted on the mounting plate on either side drives the lifting slider to descend through the rotatable connection between the rotating cylinder and the connecting shaft, the rotatable engagement between the first connecting rod and the rotating cylinder, and the rotatable engagement between the second connecting rod and the lifting slider. During the descent process, the lifting slider drives the folding screen mounted on the mounting plate on the other side to fold and rotate through the rotatable connection between the second connecting rod and the lifting slider, the rotatable engagement between the first connecting rod and the rotating cylinder, and the rotatable engagement between the rotating cylinder and the connecting shaft.

[0006] Furthermore, each rotating drum is provided with a first rotating groove with an opening, and a first rotating shaft is rotatably connected in the first rotating groove. Each first rotating groove is provided with a limiting groove adapted to the transmission rod. The limiting groove is connected to the first rotating groove. When the mounting plate is not rotated, the transmission rod is engaged in the corresponding limiting groove. The lifting slider is provided with a second rotating groove that is oppositely arranged and has an opening. The side of the second rotating groove is provided with a limiting rotating hole. The second connecting rod is rotatably arranged in the second rotating groove. The second connecting rod is rotatably connected to the second rotating groove through the rotatable engagement of one end with the limiting rotating hole. The openings of the first rotating groove and the second rotating groove are both larger than the width of the transmission rod. The lifting slider is connected to the base block for lifting through the rotational connection of the rotating drum and the connecting shaft, the rotational connection of the first connecting rod and the first rotating groove, and the rotational engagement of the second connecting rod and the second rotating groove.

[0007] Furthermore, each limiting slot is provided with a first pressing slope that presses against the transmission rod, and each second rotating slot is provided with a second pressing slope. When the mounting plate is not rotating, each transmission rod presses against the first pressing slope and the second pressing slope.

[0008] Furthermore, the first substrate is provided with two first damping teeth corresponding to each connecting shaft. The first damping teeth include multiple first damping teeth circumferentially distributed along the axis of the connecting shaft and integrally formed with the first substrate. The movable substrate is provided with two second damping teeth corresponding to each first damping tooth. The second damping teeth include multiple second damping teeth circumferentially distributed along the axis of the connecting shaft and integrally formed with the movable substrate. One end of each rotating cylinder is provided with a first damping groove corresponding to each first damping tooth, and the other end of each rotating cylinder is provided with a second damping groove corresponding to each second damping tooth. Each rotating cylinder is positioned after rotation by the continuous force applied to the movable substrate by the first return spring and the insertion and engagement of each first damping tooth and first damping groove or the insertion and engagement of the second damping tooth and second damping groove.

[0009] Furthermore, the aforementioned base block is an oblong protrusion, and the lifting slider is provided with an oblong through groove corresponding to the oblong protrusion. The oblong protrusion is slidably disposed in the oblong through groove, and the lifting slider moves up and down through the cooperation of the oblong protrusion and the oblong through groove.

[0010] Furthermore, a guide rod is provided between the second substrate and the movable substrate to assist in guiding the movement of the movable substrate. The guide rod is located between the connecting shafts that are arranged opposite each other. One end of the guide rod is fixed on the second substrate. The movable substrate is provided with a connecting through hole. The other end of the guide rod passes through the connecting through hole and is slidably connected to the movable substrate. A second return spring is sleeved on the guide rod. The two ends of the second return spring act on the second substrate and the movable substrate respectively.

[0011] Furthermore, each connecting shaft has a limiting end plate at both ends. The limiting end plate at one end of each connecting shaft presses against the end face of the first base plate away from the first damping tooth. The other end of each connecting shaft is secured with a retaining spring. The retaining spring is disposed between the second base plate and the limiting end plate. The limiting end plate at the other end of each connecting shaft presses against the retaining spring. The retaining spring presses against the end face of the second base plate away from the second reset spring.

[0012] Furthermore, the second substrate is provided with an extension plate that is perpendicular to the second substrate. The extension plate is provided with mounting holes and locking members are provided in the mounting holes. The second substrate is fixed to the keel of the electronic device by the connection between the locking members in the mounting holes and the keel of the electronic device.

[0013] This utility model has the following positive effects: (1) By setting up a flipping component, the flipping component completely replaces the gear set in the prior art through the cooperation of the base block, the lifting slider, the rotating part and the connecting part. This greatly saves the internal design space, reduces the design difficulty, and avoids the noise, wear and transmission gap and asynchronous problems caused by the gear transmission. During the folding and rotating process, the folding screen mounted on the mounting plate on either side drives the lifting slider to descend through the rotational connection between the rotating cylinder and the connecting shaft, the rotational cooperation between the first connecting rod and the rotating cylinder, and the rotational cooperation between the second connecting rod and the lifting slider. During the process, the folding screen mounted on the mounting plate on the other side is folded and rotated synchronously. The downward movement of the lifting slider is transmitted to the rotating cylinder on the other side through the connecting part on the other side, thereby forcing the screen on the other side to fold and rotate synchronously. The forced mechanical linkage ensures the absolute synchronization of the flip angle of the two screens. At the same time, the continuous force applied to the moving base plate by the first reset spring keeps the moving base plate pressed against the rotating cylinder, providing the necessary initial clamping force for the cylinder to hover. This greatly improves the stability of each folding screen during rotation. Compared with traditional gear transmission, it greatly reduces the manufacturing difficulty and cost. The structure is ingenious, convenient and practical.

[0014] (2) By setting the first rotating groove, the limiting slot, the second rotating groove and the limiting rotating hole, this utility model provides a clear and reliable installation and rotation fulcrum for the first connecting rod, the second connecting rod and the transmission rod, thereby ensuring the effective connection and limiting of the transmission rod. The setting of the limiting slot can ensure that the transmission rod is locked in the initial position, which helps to maintain the unfolded state of the folding screen. At the same time, the opening of the first rotating groove and the second rotating groove is larger than the width of the transmission rod, providing the necessary floating space for the transmission rod during the movement, ensuring the smooth operation of the lifting slider during the lifting process and avoiding jamming.

[0015] (3) By setting the first pressing slope and the second pressing slope, when the device is in the unfolded state, the transmission rod presses against the first pressing slope and the second pressing slope at the same time, which can effectively eliminate the gap between the connecting parts. This allows each folding screen to provide the user with a firm and non-playing feel at the moment it starts to fold from the unfolded state, thereby improving the texture and quality of opening and closing. At the same time, the pressing relationship of the slope can stably constrain the transmission rod in the initial state, enhancing the overall rigidity and stability of the flipping assembly in the static state.

[0016] (4) This utility model, by setting a first damping tooth and a second damping tooth, and by the insertion and cooperation of the first damping tooth with the first damping groove and the second damping tooth with the second damping groove, and under the continuous pressure of the first return spring, the rotating cylinder will be subjected to periodic damping force during rotation. This allows the rotating shaft to reliably hover at any angle within the opening and closing range. The engagement and disengagement of the damping teeth will produce a soft and clear segmented feel, making the opening and closing process smooth and not loose, providing the user with a smooth segmented feel. At the same time, damping structures are set at both ends and the damping structures are set on both sides of the first substrate and the moving substrate, so that the folding screen can obtain damping force and hovering effect no matter which direction it is folded, making the overall performance more balanced and reliable.

[0017] (5) By setting the base block as a waist-shaped protrusion and setting a waist-shaped through groove on the lifting slider, this utility model can accurately limit the movement trajectory of the lifting slider, ensuring that it only performs linear lifting motion without deflection or jamming, further improving the overall stability of the flipping component, which is efficient and convenient.

[0018] (6) By setting a guide rod on the second substrate, the present invention provides additional guide support for the moving substrate located between the connecting shafts, which can effectively prevent the moving substrate from tilting or getting stuck during the pressure and movement process, and ensure that it always moves smoothly parallel to the first and second substrates. In addition, the second return spring works in conjunction with the first return spring to provide a more uniform and symmetrical clamping force for the moving substrate in the central area, avoiding the problem of uneven load that may be caused by single-point force application, making the pressure of the moving substrate on the rotating cylinder more balanced, thereby improving the stability and consistency of the damping and hovering effect.

[0019] (7) By setting limiting end plates at both ends of the connecting shaft, the entire flipping assembly can be firmly and accurately limited between the first substrate and the second substrate by pressing the limiting end plate at one end and locking the snap ring at the other end, while also ensuring the tightness and compactness of the overall structure.

[0020] (8) By setting an extension plate on the second substrate, the design of the extension plate and the mounting hole provides a robust and reliable connection solution for the overall flip assembly and the keel of the electronic device, ensuring that the flip assembly can withstand the force of frequent opening and closing. At the same time, by using locking parts, such as screws, to connect the second substrate and the keel, the overall stability is further improved, making it efficient and practical. Attached Figure Description

[0021] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein... Figure 1This is a schematic diagram of the overall structure of the toothless rotating shaft for the folding screen in this utility model; Figure 2 This is a schematic diagram of the overall structure of the folding screen using the toothless hinge in this utility model when folded; Figure 3 This is a schematic diagram of the overall structure of the first substrate and the second substrate connected to the connecting shaft in this utility model; Figure 4 This is a schematic diagram of the overall structure of the rotating part in this utility model; Figure 5 This is a schematic diagram of the overall structure of the lifting slider in this utility model; Figure 6 This is a schematic diagram of the overall structure of the first substrate in this utility model; Figure 7 This is a schematic diagram of the overall structure of the second substrate in this utility model; Figure 8 This is a schematic diagram of the overall structure of the connecting part in this utility model; The attached figures are labeled as follows: First base plate 1, first damping tooth 11, second base plate 2, extension plate 21, mounting hole 22, connecting shaft 3, limiting end plate 31, snap ring 32, first return spring 4, moving base plate 5, second damping tooth 51, connecting through hole 52, flipping assembly 6, base block 61, lifting slider 62, waist-shaped through groove 621, limiting rotating hole 622, second rotating groove 623, second pressing inclined surface 624, rotating part 63, rotating cylinder 631, mounting plate 632, first damping groove 633, second damping groove 634, first rotating groove 635, limiting snap groove 636, first pressing inclined surface 637, connecting part 64, first connecting rod 641, second connecting rod 642, transmission rod 643, guide rod 7, second return spring 71. Detailed Implementation

[0022] See Figures 1 to 8This utility model comprises a first substrate 1 and a second substrate 2 arranged opposite to each other, two connecting shafts 3 arranged opposite to each other for connecting the first substrate 1 and the second substrate 2, and a movable substrate 5 disposed between the first substrate 1 and the second substrate 2. The movable substrate 5 is arranged parallel to the first substrate 1 and the second substrate 2 and is slidably connected to each connecting shaft 3. Each connecting shaft 3 is fitted with a first return spring 4, and each first return spring 4 is located between the movable substrate 5 and the second substrate 2. The two ends of each first return spring 4 act on the movable substrate 5 and the second substrate 2 respectively. A flip assembly 6 for synchronous flipping of a folding screen is provided between the first substrate 1 and the movable substrate 5. The flip assembly 6 includes a base block 61 that can be fixedly installed on the keel of an electronic device, a lifting slider 62 that is slidably connected to the base block 61, a rotating part 63 that is rotatably connected to each connecting shaft 3, and a connecting part 64 for connecting the lifting slider 62 and the rotating part 63. The rotating parts 63 on each connecting shaft 3 are arranged opposite to each other. The rotating part 63 includes a rotating cylinder 631 fitted and rotatably connected to the corresponding connecting shaft 3, and An installation plate 632, integrally formed with the rotating cylinder 631 and connectable to a corresponding folding screen, is used. The movable base plate 5 is pressed against the rotating cylinder 631 by the continuous force of each first return spring 4. The connecting part 64 includes a first connecting rod 641 rotatably connected to the rotating cylinder 631, a second connecting rod 642 rotatably connected to the lifting slider 62, and a transmission rod 643 for connecting the first connecting rod 641 and the second connecting rod 642. The axes of the first connecting rod 641 and the second connecting rod 642 are both parallel to the axis of the connecting shaft 3, and either side is mounted on the installation plate 632. During the folding and rotating process, the folding screen on the top is driven to descend by the rotational connection between the rotating cylinder 631 and the connecting shaft 3, the rotational cooperation between the first connecting rod 641 and the rotating cylinder 631, and the rotational cooperation between the second connecting rod 642 and the lifting slider 62. During the descent, the lifting slider 62 drives the folding screen mounted on the mounting plate 632 on the other side to fold and rotate through the rotational connection between the second connecting rod 642 and the lifting slider 62, the rotational cooperation between the first connecting rod 641 and the rotating cylinder 631, and the rotational cooperation between the rotating cylinder 631 and the connecting shaft 3.

[0023] Each rotating drum 631 is provided with a first rotating groove 635 with an opening. A first rotating shaft is rotatably connected in the first rotating groove 635. Each first rotating groove 635 is provided with a limiting groove 636 adapted to the transmission rod 643. The limiting groove 636 communicates with the first rotating groove 635. When the mounting plate 632 is not rotating, the transmission rod 643 is engaged in the corresponding limiting groove 636. The lifting slider 62 is provided with a second rotating groove 623 with an opening and opposite to it. The side of the second rotating groove 623 is provided with a limiting rotating hole 622. The second connecting rod 642 is rotatably disposed in the second rotating groove 623. The second connecting rod 642 is rotatably connected to the second rotating groove 623 through the rotatable engagement of one end with the limiting rotating hole 622. The openings of the first rotating groove 635 and the second rotating groove 623 are both larger than the width of the transmission rod 643. The lifting slider 62 is connected to the base block 61 through the rotatable connection of the rotating cylinder 631 and the connecting shaft 3, the rotatable connection of the first connecting rod 641 and the first rotating groove 635, and the rotatable engagement of the second connecting rod 642 and the second rotating groove 623.

[0024] Each limiting slot 636 is provided with a first pressing slope 637 that presses against the transmission rod 643, and each second rotating slot 623 is provided with a second pressing slope 624. When the mounting plate 632 is not rotated, each transmission rod 643 presses against the first pressing slope 637 and the second pressing slope 624.

[0025] The first base plate 1 is provided with two first damping teeth 11 corresponding to each connecting shaft 3. The first damping teeth 11 include a plurality of first damping teeth 11 circumferentially distributed along the axis of the connecting shaft 3 and integrally formed with the first base plate 1. The movable base plate 5 is provided with two second damping teeth 51 corresponding to each first damping teeth 11. The second damping teeth 51 include a plurality of second damping teeth 51 circumferentially distributed along the axis of the connecting shaft 3 and integrally formed with the movable base plate 5. One end of each rotating cylinder 631 is provided with a first damping groove 633 corresponding to each first damping tooth 11, and the other end of each rotating cylinder 631 is provided with a second damping groove 634 corresponding to each second damping tooth 51. Each rotating cylinder 631 is positioned after rotation by the continuous force applied to the movable base plate 5 by the first return spring 4 and the insertion and engagement of each first damping tooth 11 and the first damping groove 633 or the insertion and engagement of the second damping tooth 51 and the second damping groove 634.

[0026] The base block 61 is an oblong protrusion, and the lifting slider 62 is provided with an oblong through groove 621 corresponding to the oblong protrusion. The oblong protrusion is slidably disposed in the oblong through groove 621, and the lifting slider 62 moves up and down through the cooperation of the oblong protrusion and the oblong through groove 621.

[0027] A guide rod 7 is provided between the second substrate 2 and the movable substrate 5 to assist in guiding the movement of the movable substrate 5. The guide rod 7 is located between the connecting shafts 3 that are arranged opposite each other. One end of the guide rod 7 is fixed on the second substrate 2. The movable substrate 5 is provided with a connecting through hole 52. The other end of the guide rod 7 passes through the connecting through hole 52 and is slidably connected to the movable substrate 5. A second return spring 71 is sleeved on the guide rod 7. The two ends of the second return spring 71 act on the second substrate 2 and the movable substrate 5 respectively.

[0028] Each connecting shaft 3 has a limiting end plate 31 at both ends. The limiting end plate 31 at one end of each connecting shaft 3 presses against the end face of the first base plate 1 away from the first damping tooth 11. The other end of each connecting shaft 3 is engaged with a retaining spring 32. The retaining spring 32 is disposed between the second base plate 2 and the limiting end plate 31. The limiting end plate 31 at the other end of each connecting shaft 3 presses against the retaining spring 32. The retaining spring 32 presses against the end face of the second base plate 2 away from the second reset spring 71.

[0029] The second substrate 2 is provided with an extension plate 21 that is perpendicular to the second substrate 2. The extension plate 21 is provided with a mounting hole 22 and a locking member is provided in the mounting hole 22. The second substrate 2 is fixed to the keel of the electronic device by the connection between the locking member in the mounting hole 22 and the keel of the electronic device.

[0030] The working principle of this utility model is as follows: During use, the second substrate 2 and the first substrate 1 connected to the second substrate 2 via the connecting shaft 3 are fixedly connected to the keel of the electronic device through the mounting holes 22 on the extension plate 21 and the locking components within the mounting holes 22, such as locking bolts or locking screws. After the first substrate 1, the second substrate 2, and the connecting shaft 3 are connected, the tightness and compactness of the overall connection are ensured by the snap ring 32, saving overall design space while ensuring the stability of the overall structure. Then, the folding screen is installed on the mounting plate 632. In the initial state, each folding screen is in a horizontal state and is fixed by the limiting slot 63. The cooperation between the 6 and the transmission rod 643, as well as the pressure of the first pressing inclined surface 637 and the second pressing inclined surface 624 on the transmission rod 643, ensures its stability. At the same time, the openings on the first rotating groove 635 and the second rotating groove 623 are set to be larger than the width of the transmission rod 643, which can prevent the connecting part 64 from getting stuck during transmission. The moving base plate 5 presses the rotating cylinder 631 by the continuous force of each first return spring 4 and the second return spring 71. At the same time, the cooperation of each first damping tooth 11 with the first damping groove 633 and the cooperation of each second damping tooth 51 with the second damping groove 634 further ensures the stability of each folding screen before folding. During the folding and rotation process of the folding screen mounted on the mounting plate 632 on either side, the rotating cylinder 631 and the connecting shaft 3 rotate together, the first connecting rod 641 and the rotating cylinder 631 rotate together, and the second connecting rod 642 and the lifting slider 62 rotate together to drive the lifting slider 62 to descend. During the descent of the lifting slider 62, the second connecting rod and the lifting slider 62 rotate together, the first connecting rod 641 and the rotating cylinder 631 rotate together, and the rotating cylinder 631 and the connecting shaft 3 rotate together to drive the folding screen mounted on the mounting plate 632 on the other side to fold and rotate synchronously. When the screen rotates to the required angle, the first damping teeth 11 engage with the first damping grooves 633. The device uses the engagement of the second damping teeth 51 with the second damping grooves 634 to achieve suspension. It can also be fixed after the folded screens overlap by engaging the first damping teeth 11 with the first damping grooves 633 and the second damping teeth 51 with the second damping grooves 634. This greatly ensures the smoothness of the folding process and solves the problems of noise, wear, transmission gaps, and asynchrony caused by wear in existing gear transmissions. It ensures the synchronicity of the folding of both sides of the screens without causing wear, and greatly improves the service life of the folded screens and the overall electronic device. The structure is ingenious, convenient, and practical.

[0031] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A toothless hinge for a foldable screen electronic device, comprising a first substrate and a second substrate disposed opposite to each other, two connecting shafts disposed opposite to each other for connecting the first substrate and the second substrate, and a movable substrate disposed between the first substrate and the second substrate, wherein the movable substrate is disposed parallel to both the first substrate and the second substrate and is slidably connected to each connecting shaft; characterized in that: Each connecting shaft is fitted with a first return spring, which is located between the moving base plate and the second base plate. The two ends of each first return spring act on the moving base plate and the second base plate, respectively. A flipping assembly for synchronous flipping of the folding screen is provided between the first base plate and the moving base plate. The flipping assembly includes a base block that can be fixedly mounted on the keel of the electronic device, a lifting slider that is slidably connected to the base block, a rotating part that is rotatably connected to each connecting shaft, and a connecting part for connecting the lifting slider and the rotating part. The rotating parts on each connecting shaft are arranged opposite to each other. Each rotating part includes a rotating cylinder fitted and rotatably connected to the corresponding connecting shaft, and a mounting plate integrally formed with the rotating cylinder and connectable to the corresponding folding screen. The moving base plate is connected via each first return spring. The continuous force of the spring presses against the rotating drum. The connecting part includes a first connecting rod rotatably connected to the rotating drum, a second connecting rod rotatably connected to the lifting slider, and a transmission rod for connecting the first and second connecting rods. The axes of the first and second connecting rods are both parallel to the axis of the connecting shaft. During the folding and rotating process, the folding screen mounted on the mounting plate on either side drives the lifting slider to descend through the rotatable connection between the rotating drum and the connecting shaft, the rotatable engagement between the first connecting rod and the rotating drum, and the rotatable engagement between the second connecting rod and the lifting slider. During the descent, the lifting slider drives the folding screen mounted on the mounting plate on the other side to fold and rotate through the rotatable connection between the second connecting rod and the lifting slider, the rotatable engagement between the first connecting rod and the rotating drum, and the rotatable engagement between the rotating drum and the connecting shaft.

2. The toothless hinge for a foldable screen electronic device according to claim 1, characterized in that: Each rotating drum is provided with a first rotating groove with an opening. A first rotating shaft is rotatably connected in the first rotating groove. Each first rotating groove is provided with a limiting groove that matches the transmission rod. The limiting groove communicates with the first rotating groove. When the mounting plate is not rotated, the transmission rod is engaged in the corresponding limiting groove. The lifting slider is provided with a second rotating groove that is oppositely arranged and has an opening. The side of the second rotating groove is provided with a limiting rotating hole. The second connecting rod is rotatably arranged in the second rotating groove. The second connecting rod is rotatably connected to the second rotating groove through the rotatable engagement of one end with the limiting rotating hole. The openings of the first and second rotating grooves are both larger than the width of the transmission rod. The lifting slider is connected to the base block for lifting through the rotational connection between the rotating drum and the connecting shaft, the rotational connection between the first connecting rod and the first rotating groove, and the rotational engagement between the second connecting rod and the second rotating groove.

3. The toothless hinge for a foldable screen electronic device according to claim 2, characterized in that: Each limiting slot is provided with a first pressing slope that presses against the transmission rod, and each second rotating slot is provided with a second pressing slope. When the mounting plate is not rotating, each transmission rod presses against the first pressing slope and the second pressing slope.

4. The toothless hinge for a foldable screen electronic device according to claim 3, characterized in that: The first base plate is provided with two first damping teeth corresponding to each connecting shaft. The first damping teeth include multiple first damping teeth that are circumferentially distributed along the axis of the connecting shaft and integrally formed with the first base plate. The movable base plate is provided with two second damping teeth corresponding to each first damping tooth. The second damping teeth include multiple second damping teeth that are circumferentially distributed along the axis of the connecting shaft and integrally formed with the movable base plate. One end of each rotating cylinder is provided with a first damping groove corresponding to each first damping tooth, and the other end of each rotating cylinder is provided with a second damping groove corresponding to each second damping tooth. Each rotating cylinder is positioned after rotation by the continuous force applied to the movable base plate by the first return spring and the insertion and engagement of each first damping tooth and the first damping groove or the insertion and engagement of the second damping tooth and the second damping groove.

5. The toothless hinge for a foldable screen electronic device according to claim 4, characterized in that: The base block is a waist-shaped protrusion, and the lifting slider is provided with a waist-shaped through groove corresponding to the waist-shaped protrusion. The waist-shaped protrusion is slidably disposed in the waist-shaped through groove, and the lifting slider moves up and down by the cooperation of the waist-shaped protrusion and the waist-shaped through groove.

6. The toothless hinge for a foldable screen electronic device according to claim 5, characterized in that: A guide rod is provided between the second substrate and the movable substrate to assist in guiding the movement of the movable substrate. The guide rod is located between the connecting shafts that are arranged opposite each other. One end of the guide rod is fixed on the second substrate. The movable substrate has a connecting through hole. The other end of the guide rod passes through the connecting through hole and is slidably connected to the movable substrate. A second return spring is sleeved on the guide rod. The two ends of the second return spring act on the second substrate and the movable substrate respectively.

7. The toothless hinge for a foldable screen electronic device according to claim 6, characterized in that: Each connecting shaft has a limiting end plate at both ends. The limiting end plate at one end of each connecting shaft presses against the end face of the first base plate away from the first damping tooth. The other end of each connecting shaft is secured with a retaining spring. The retaining spring is located between the second base plate and the limiting end plate. The limiting end plate at the other end of each connecting shaft presses against the retaining spring. The retaining spring presses against the end face of the second base plate away from the second reset spring.

8. The toothless hinge for a foldable screen electronic device according to claim 7, characterized in that: The second substrate is provided with an extension plate that is perpendicular to the second substrate. The extension plate is provided with a mounting hole and a locking member is provided in the mounting hole. The second substrate is fixed to the keel of the electronic device by the connection between the locking member in the mounting hole and the keel of the electronic device.

Images