Bidirectional buffering hardware hinge

Abstract

A bidirectional buffering hardware hinge comprises a base, a hinge cup, an upper connecting rod and a lower connecting rod, and the two ends of the upper connecting rod and the two ends of the lower connecting rod are hinged to the base and the hinge cup through corresponding hinge shafts respectively. A first extrusion cambered surface and a second extrusion cambered surface are arranged at the end, close to the end hinged to the hinge cup, of the upper connecting rod in the direction of the hinge cup; a slidable linkage plate is arranged in the hinge cup, and a stress end matched with the first extrusion cambered surface and the second extrusion cambered surface is arranged on the linkage plate; a buffer is arranged between the hinge cup and the linkage plate; when the upper connecting rod swings in the closing direction, the first extrusion arc face abuts against the stress end to push the linkage plate to slide and compress the buffer. When the upper connecting rod swings in the opening direction, the second extrusion arc face abuts against the stress end to push the linkage plate to slide and compress the buffer, and bidirectional buffering is achieved.

Description

Technical Field

[0001] This invention relates to the field of hardware hinge technology, specifically a bidirectional buffer hardware hinge. Background Technology

[0002] Existing furniture hinges typically employ a four-bar linkage to achieve the rotational connection between the door panel and the cabinet. To improve the user experience, reduce noise, and prevent collision damage caused by rapid door closure, the industry has widely incorporated buffer structures into hinges. These include dampers, buffers, or elastic buffer components placed within the hinge cup or hinge arm, which dampen the door panel as it approaches the closing point, thus achieving the effect of "soft closing / silent door closing."

[0003] However, most existing hinges with buffering functions only provide buffering in the closing direction. Their buffers are triggered and generate damping during the door's closing stroke, but often lack effective buffering control in the opening direction. Because cabinet doors are easily affected by factors such as user force, elastic rebound, door inertia, and hinge spring / reset force during opening, the door is prone to excessive opening speed, impact upon opening, or even rebound and swinging back at the end of the opening process. This rebound and impact are particularly pronounced in applications with larger or heavier door panels, easily causing the following problems: (1) If there is a lack of damping when the door panel is opened to the position, the inertial impact at the moment of opening to the position may cause the door panel to bounce back or swing multiple times, which not only affects the feel and noise reduction, but may also cause the door panel to collide with adjacent cabinets, walls or handles, resulting in scratches, bumps or noise.

[0004] (2) The impact force during the opening of the door panel will be transmitted through the hinge to the connection between the hinge and the door panel and the cabinet body, especially the hinge base and hinge cup, which are fixed to the board by screws. Long-term repeated opening impact and rebound prying action will cause the connecting screws to gradually loosen, creating gaps at the connection, which will cause the door panel to sag and shift. In severe cases, the connection between the hinge and the board may even fall off, affecting the normal use and safety of the cabinet door.

[0005] (3) Under the continuous impact and loosening, the hinge parts and buffer components of the hinge mechanism are prone to accelerated wear, resulting in reduced door opening and closing accuracy, shortened service life, and the need for frequent adjustment or tightening of screws, which increases maintenance costs. Therefore, it is necessary to make further improvements. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a two-way buffer hardware hinge that is simple in structure, improves the stability and user experience of the door opening process, and enhances the reliability of the connection between the hinge and the board.

[0007] To achieve the above objectives, the present invention provides a bidirectional buffer hardware hinge, including a base, a hinge cup, an upper connecting rod and a lower connecting rod, wherein the two ends of the upper connecting rod and the lower connecting rod are respectively hinged to the base and the hinge cup through corresponding hinge pins; The upper connecting rod has a first extrusion arc surface and a second extrusion arc surface at the end near which it is hinged to the hinge cup, facing the hinge cup. The hinge cup is provided with a sliding linkage plate, and the linkage plate is provided with a force-receiving end that cooperates with the first extrusion arc surface and the second extrusion arc surface; A buffer is provided between the hinge cup and the linkage plate; When the upper connecting rod swings in the closing direction, the first extrusion arc surface presses against the force-bearing end, pushing the linkage plate to slide and compress the buffer; when the upper connecting rod swings in the opening direction, the second extrusion arc surface presses against the force-bearing end, pushing the linkage plate to slide and compress the buffer.

[0008] Furthermore: the second extrusion arc surface is located at the end of the upper connecting rod away from its hinge point with the hinge cup, and the first extrusion arc surface and the second extrusion arc surface are connected by a concave transition arc surface.

[0009] Furthermore, the end of the second extrusion arc surface is formed with a protruding tip that protrudes toward the force-bearing end.

[0010] Furthermore, the first and second extrusion arc surfaces and the upper connecting rod are integrally stamped from metal sheets.

[0011] Furthermore, the first and second extruded arc surfaces are integrally injection molded from plastic material onto the insert, which is then fitted into the mounting area of ​​the upper connecting rod via a connecting mechanism.

[0012] Furthermore, the connecting mechanism includes an insert plate disposed on the upper connecting rod and a connecting groove disposed on the insert, wherein the insert plate is inserted into the connecting groove to connect the two.

[0013] Furthermore, the inlay is provided with docking holes on both sides. The hinge shaft at the hinge joint between the upper connecting rod and the hinge cup passes through the hinge hole of the upper connecting rod and is inserted into the docking hole, so that the inlay and the upper connecting rod are fixed together.

[0014] Furthermore: the hinge cup is provided with a pressure plate, and a guide limiting groove is formed between the pressure plate and the bottom of the hinge cup, and the linkage plate slides in the guide limiting groove.

[0015] Furthermore: the linkage plate is provided with a receiving groove in the middle, and the buffer includes a cylinder and a piston rod; the cylinder is placed in the receiving groove and its tail abuts against the inner wall of the hinge cup; the piston rod extends into the receiving groove and abuts against the bottom of the receiving groove.

[0016] Furthermore: the linkage plate is provided with several levels of adjustment platforms, the pressure plate is provided with adjustment grooves, adjustment blocks are slidably arranged in the adjustment grooves, and the adjustment blocks are provided with stop platforms that cooperate with the adjustment platforms; the stop platforms cooperate with different adjustment platforms to limit the maximum sliding stroke of the linkage plate.

[0017] The beneficial effects of the present invention are as follows: 1. By setting a first extrusion arc surface and a second extrusion arc surface near the end of the upper connecting rod that is hinged to the hinge cup, and making the two cooperate with the force-bearing end of the sliding linkage plate inside the hinge cup, the upper connecting rod is driven by the first extrusion arc surface to compress the buffer at the end of the closing stroke, and by the second extrusion arc surface to compress the buffer at the end of the opening stroke, so that the hinge generates buffer damping at both the end of the opening and the end of the closing stroke, thereby achieving a bidirectional buffering effect, reducing the impact and rebound when the opening is in place, and reducing the impact and noise at the end of the closing stroke.

[0018] 2. The first extrusion arc surface and the second extrusion arc surface form corresponding drive contours on the same upper connecting rod. In conjunction with the linear sliding of the linkage plate and the compression of the buffer, the direct transmission from the swing of the connecting rod to the pressure of the buffer is realized. The buffer trigger path is short and the number of parts is small, which is conducive to improving the triggering stability and consistency.

[0019] 3. Due to the addition of buffer at the end of the opening, the impact load and rebound phenomenon when the door panel is opened to the full position are suppressed. The repeated prying effect of the impact force on the connection between the hinge and the panel (such as screw connection) is reduced accordingly, thereby reducing the risk of loosening of the connection and improving the overall durability.

[0020] 4. The first and second extruded arc surfaces can be integrally stamped with the upper connecting rod, or they can be injection molded and embedded in the upper connecting rod through inserts, which makes it easy to choose the implementation method according to cost and process. At the same time, by adjusting the table and the stop table to limit the maximum sliding stroke of the linkage plate, the buffer stroke can be adjusted in stages to adapt to different door panel weights and usage requirements. Attached Figure Description

[0021] Figure 1 , 2 This is a schematic diagram of the hinge structure of the present invention in the open state.

[0022] Figure 3 , 4 This is a schematic diagram of the hinge structure of the present invention in a half-closed state.

[0023] Figure 5 , 6 This is a schematic diagram of the hinge structure of the present invention in the closed state.

[0024] Figure 7 This is an exploded view of the structure of the present invention.

[0025] Figure 8 ,9 This is a diagram showing the interaction state of the upper connecting rod and the linkage plate in this invention.

[0026] Figure 10 This is a schematic diagram of the structure of the first embodiment of the upper connecting rod in this invention.

[0027] Figure 11 This is a schematic diagram of the second embodiment of the upper connecting rod in this invention.

[0028] Figure 12 This is an exploded view of the structure of the second embodiment of the upper connecting rod in this invention.

[0029] Explanation of reference numerals in the attached drawings: 1. Base; 10. Transition arc surface; 11. Inlay; 12. Connecting groove; 13. Docking hole; 14. Pressure plate; 15. Adjusting groove; 16. Adjusting block; 17. Stopping platform; 2. Hinge cup; 3. Upper connecting rod; 31. Insert plate; 32. Hinge hole; 4. Lower connecting rod; 5. Hinge shaft; 6. First extrusion arc surface; 7. Second extrusion arc surface; 8. Linkage plate; 81. Force-bearing end; 82. Receiving groove; 83. Adjusting platform; 9. Buffer; 91. Cylinder body; 92. Piston rod. Detailed Implementation

[0030] The purpose of this invention is achieved in the following way: a two-way buffer hardware hinge, including a base 1, a hinge cup 2, an upper connecting rod 3 and a lower connecting rod 4, wherein the two ends of the upper connecting rod 3 and the lower connecting rod 4 are respectively hinged to the base 1 and the hinge cup 2 through multiple hinge pins 5. The upper connecting rod 3 has a first extrusion arc surface 6 and a second extrusion arc surface 7 near the end where it is hinged to the hinge cup 2, facing the hinge cup 2. A linkage plate 8 is slidably provided inside the hinge cup 2, and a force-receiving end 81 is provided on the linkage plate 8 to cooperate with the first extrusion arc surface 6 and the second extrusion arc surface 7; A buffer 9 is provided between the hinge cup 2 and the linkage plate 8; When the first extrusion arc surface 6 is closed, the driving linkage plate 8 slides and compresses the buffer 9 against the pressure end 81 of the first extrusion arc surface 6 during the closing stroke, and when the second extrusion arc surface 7 is opened, the driving linkage plate 8 slides and compresses the buffer 9 against the pressure end 81 of the second extrusion arc surface 7 during the opening stroke.

[0031] In this embodiment, the basic opening and closing of the hinge is achieved by a linkage mechanism consisting of multiple hinge shafts 5 between the upper connecting rod 3, the lower connecting rod 4, the base 1, and the hinge cup 2.

[0032] At the end of the closing stroke: after the upper connecting rod 3 swings to a certain angle relative to the hinge cup 2, the first extrusion arc surface 6 and the force-bearing end 81 of the linkage plate 8 engage in a pressing fit; the pressing force is transmitted along the sliding direction of the linkage plate 8, causing the linkage plate 8 to slide linearly within the hinge cup 2, thereby compressing the buffer 9 set between the linkage plate 8 and the hinge cup 2, producing a damping / buffering effect.

[0033] At the end of the opening stroke: after the upper connecting rod 3 swings in the opposite direction to a certain angle, the second extrusion arc surface 7 and the force-bearing end 81 press against each other, which also drives the linkage plate 8 to slide and compress the buffer 9, forming damping / buffering at the end of the opening stroke. By having two different extrusion arc surfaces on the upper connecting rod 3 cooperate with the same force-bearing end 81, the same buffer 9 is triggered at both the end of the opening and the end of the closing stroke, thus achieving "bidirectional buffering" structurally.

[0034] The opening section generates buffer damping, which helps to suppress the impact and rebound when the cabinet door is fully opened; at the same time, it can reduce the impact of repeated prying on the hinge connection by the impact load, thereby improving the connection reliability and user comfort.

[0035] In one embodiment: the second extrusion arc surface 7 is located at the end of the upper connecting rod 3 away from its hinge point with the hinge cup 2, and the first extrusion arc surface 6 and the second extrusion arc surface 7 are connected by a concave transition arc surface 10.

[0036] In this embodiment: the second extrusion arc surface 7 is arranged at the end of the upper connecting rod 3 away from the hinge point, so that when it swings to the end in the opening direction, it is easier to establish an effective extrusion contact and lever arm relationship with the force-bearing end 81, thereby ensuring the triggering and damping establishment of the final opening stage.

[0037] The first extrusion arc surface 6 and the second extrusion arc surface 7 are connected by a concave transition arc surface 10, which makes the transition from one arc surface to another when the upper connecting rod 3 contacts the force-bearing end 81 during the opening and closing process, avoiding jamming or impact caused by abrupt contact changes. At the same time, the transition arc surface 10 helps to improve contact continuity, enhance the smoothness and consistency of the buffer triggering process, and reduce noise and wear.

[0038] In one embodiment, the end of the second extrusion arc surface 7 forms a protruding tip that faces the force-receiving end 81. This protruding tip effectively creates a more prominent contact profile on the second extrusion arc surface 7, making it easier for the second extrusion arc surface 7 to contact the force-receiving end 81 and generate sufficient extrusion displacement during the final opening phase. This more reliably drives the linkage plate 8 to slide the compression buffer 9. This improves the triggering reliability of the final opening phase and reduces the risk of the opening buffer being difficult to trigger due to manufacturing tolerances or assembly deviations. Therefore, it has advantages such as improving the opening buffer effect through profile optimization without adding extra components, small structural increment, and controllable cost.

[0039] In one embodiment: the first extrusion arc surface 6 and the second extrusion arc surface 7 are integrally stamped from metal sheet with the upper connecting rod 3.

[0040] In this embodiment, the first extrusion arc surface 6 and the second extrusion arc surface 7 serve as the contour portion of the upper connecting rod 3. After being integrally stamped, they directly contact and press with the force-bearing end 81 during opening and closing swings, realizing the mechanical transmission of the connecting rod swing into the sliding of the linkage plate 8. The integrated structure reduces the possibility of relative movement or loosening between the extrusion arc surface and the upper connecting rod, ensuring stable contact contours. The manufacturing process is simple, with fewer assembly steps, and the positional accuracy of the extrusion arc surface is easy to guarantee; the overall rigidity is good, and the dimensional and positional deviations after long-term contact wear are smaller. It can also reduce the risk of loosening, abnormal noise, or failure caused by the separate connection of parts.

[0041] In one embodiment: the first extrusion arc surface 6 and the second extrusion arc surface 7 are integrally injection molded from plastic material onto the insert 11, and the insert 11 is embedded in the mounting area of ​​the upper connecting rod 3 through a connecting mechanism.

[0042] In this embodiment: the first extrusion arc surface 6 and the second extrusion arc surface 7 are integrated into the plastic insert 11, and the insert 11 is then fixed to the mounting area of ​​the upper connecting rod 3. When the upper connecting rod 3 swings, the arc surface on the insert 11 contacts and presses against the force-bearing end 81, driving the linkage plate 8 to slide and compress the buffer 9.

[0043] Among them, the insert 11 serves as a replaceable or customizable contour carrier, allowing for more flexible selection of materials and shapes for the extruded contour. The plastic material contact helps reduce noise and wear caused by hard metal contact; it also facilitates the creation of more complex curved contours through molds, increasing the freedom of trigger curve design. Furthermore, the modular design of the insert allows for a series of configurations and maintenance replacements with different cushioning feel / trigger characteristics.

[0044] In one embodiment, the connecting mechanism includes an insert plate 31 disposed on the upper connecting rod 3 and a connecting groove 12 disposed on the insert 11. The insert plate 31 is inserted into the connecting groove 12 to connect the two. The insert plate 31 and the connecting groove 12 form an insertion fit, so that the insert 11 is positioned and connected within the mounting area of ​​the upper connecting rod 3. This connection method keeps the extrusion arc surface of the insert 11 in a stable position relative to the upper connecting rod 3, thereby ensuring the stability of the contact point, contact angle, and displacement transmission relationship when it comes into contact with the force-bearing end 81.

[0045] In one embodiment: the inlay 11 has docking holes 13 on both sides. The hinge shaft 5 at the hinge joint between the upper connecting rod 3 and the hinge cup 2 passes through the hinge hole 32 of the upper connecting rod 3 and is inserted into the docking hole 13, so that the inlay 11 and the upper connecting rod 3 are fixed together.

[0046] While fulfilling the hinge function between the upper connecting rod 3 and the hinge cup 2, the hinge shaft 5 also passes through the mating hole 13 of the inlay 11, forming an integrated connection path of "hinge + locking".

[0047] In this way, the insert 11 is not only positioned by the plug-in structure, but also further restricted by the hinge 5 to its dislodgement and relative wobble in the assembly direction, ensuring long-term stable operation of the curved surface. Using the existing hinge for additional fixation eliminates the need for extra fasteners, resulting in a simpler structure and stronger resistance to loosening. Simultaneously, it helps improve long-term durability and buffer trigger stability, reducing the risk of abnormal noise and failure caused by insert loosening.

[0048] In one embodiment: the hinge cup 2 is provided with a pressure plate 14, and a guide limiting groove is formed between the pressure plate 14 and the bottom of the hinge cup 2. The linkage plate 8 slides within the guide limiting groove. The pressure plate 14 and the bottom of the hinge cup 2 together form the guide limiting groove, providing guidance and limitation for the sliding of the linkage plate 8. When the extruded arc surface presses against the force-bearing end 81, the linkage plate 8 slides linearly in a predetermined direction under the constraint of the guide limiting groove, reducing sway, jamming, and uneven friction, thereby ensuring the stability of the buffer 9 during the compression process. This improves the controllability and repeatability of the linkage plate's movement and enhances the consistency of buffer triggering. At the same time, it reduces wear caused by off-center loading of the linkage plate, improving the overall lifespan and reliability of the machine.

[0049] In one embodiment: the linkage plate 8 has a receiving groove 82 in the middle, and the buffer 9 includes a cylinder 91 and a piston rod 92; the cylinder 91 is placed in the receiving groove 82 and its tail abuts against the inner wall of the hinge cup 2; the piston rod 92 extends into the receiving groove 82 and abuts against the bottom of the receiving groove 82. In this embodiment: the cylinder 91 is located in the receiving groove 82 of the linkage plate 8, and its tail abuts against the inner wall of the hinge cup 2 to form a relatively "fixed end" support; the piston rod 92 extends into the receiving groove 82 and abuts against the bottom of the groove.

[0050] When the linkage plate 8 slides under the extrusion arc drive, the bottom of the receiving groove 82 pushes the piston rod 92, causing the piston rod 92 to move relative to the cylinder 91, thereby forming the compression stroke of the buffer 9 and producing a damping / buffering effect.

[0051] In one embodiment: the linkage plate 8 is provided with several levels of adjustment platforms 83, the pressure plate 14 is provided with adjustment grooves 15, the adjustment block 16 is slidably arranged in the adjustment groove 15, and the adjustment block 16 is provided with a stop platform 17 that cooperates with the adjustment platform 83; the stop platform 17 cooperates with different adjustment platforms 83 to limit the maximum sliding stroke of the linkage plate 8.

[0052] In this embodiment, the adjusting block 16 can slide within the adjusting groove 15 to change its position, allowing the stop platform 17 to engage with different levels of adjusting platforms 83 on the linkage plate 8. When the linkage plate 8 is driven to its limit position by the compressed arc surface, the stop platform 17 and the corresponding adjusting platform 83 form a mechanical stop, thereby limiting the maximum sliding stroke of the linkage plate 8. By limiting the upper limit of the stroke in stages, the degree of buffering stroke / buffering effect can be adapted, for example, to meet different door weights and different opening and closing feel requirements, improving the product's versatility and adjustability.

[0053] In summary, this bidirectional buffer hinge consists of a base 1, a hinge cup 2, an upper connecting rod 3, a lower connecting rod 4, and multiple hinge shafts 5, forming a linkage hinge mechanism. The door panel opens and closes as the hinge cup 2 rotates relative to the base 1. The hinge cup 2 has a sliding linkage plate 8 inside, which can slide along its internal guide direction, and a buffer 9 is placed between the hinge cup 2 and the linkage plate 8. The upper connecting rod 3 forms a first pressing arc surface 6 and a second pressing arc surface 7 at its end near the hinge cup 2, facing the hinge cup 2. The linkage plate 8 has a force-bearing end 81 that presses against the aforementioned pressing arc surfaces, thereby establishing a motion and force transmission relationship between the swinging of the connecting rod and the sliding of the linkage plate.

[0054] At the end of the closing stroke, as the upper connecting rod 3 swings around its hinge point with the hinge cup 2, the first extrusion arc surface 6 contacts and presses against the force-bearing end 81. This pressure drives the linkage plate 8 to move along the sliding direction within the hinge cup 2, causing the buffer 9 to compress and form a damping buffer, thereby reducing the impact and noise when the door panel is closed. At the end of the opening stroke, when the upper connecting rod 3 swings in the opposite direction, the second extrusion arc surface 7 contacts and presses against the force-bearing end 81, similarly driving the linkage plate 8 to slide and compress the buffer 9, thus forming a damping buffer at the end of the door panel's opening stroke, suppressing the impact and rebound when the door panel is fully open.

[0055] In a further structure, the second extrusion arc surface 7 can be located at the end of the upper connecting rod 3 away from the hinge point. The first extrusion arc surface 6 and the second extrusion arc surface 7 are connected by a concave transition arc surface 10, making the contact transition between the arc surface and the force-bearing end 81 smoother and improving the continuity and stability of bidirectional buffer triggering. The end of the second extrusion arc surface 7 forms a protruding tip that protrudes towards the force-bearing end 81, which can improve the triggering reliability of the final opening stage. The linkage plate 8 can slide in the guide limiting groove formed at the bottom of the pressure plate 14 and the hinge cup 2, thereby ensuring the stability of the linkage plate's movement direction, reducing jamming and improving buffer consistency. The buffer 9 can take the form of a cylinder 91 and a piston rod 92. The cylinder 91 is placed in the receiving groove 82 of the linkage plate 8 and its tail abuts against the inner wall of the hinge cup 2 to form a reaction force support. The piston rod 92 extends into the receiving groove 82 and abuts against the bottom of the groove. When the linkage plate slides, it pushes the piston rod, causing the piston rod to displace relative to the cylinder, thereby realizing the compression and damping output of the buffer. Furthermore, the linkage plate 8 is provided with several adjustment platforms 83, the pressure plate 14 is provided with adjustment grooves 15 and adjustment blocks 16 are slidably arranged, and the adjustment blocks 16 are provided with stop platforms 17 to cooperate with the adjustment platforms 83 to limit the maximum sliding stroke of the linkage plate 8, so as to realize the graded control and adaptation of the upper limit of the buffer stroke.

[0056] Therefore, this hinge utilizes the first and second extrusion arc surfaces on the upper connecting rod 3 to drive the linkage plate 8 to compress the buffer 9 at the end of the closing and opening phases, respectively. Without adding extra complex transmission, the same buffer can be effectively triggered in both opening and closing directions, thereby achieving a bidirectional buffering effect at the end of the opening and closing phases, and improving the stability of the door panel movement and the reliability of use. Therefore, it can be widely promoted and used.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A bidirectional buffer metal hinge, comprising a base (1), a hinge cup (2), an upper connecting rod (3), and a lower connecting rod (4), wherein the two ends of the upper connecting rod (3) and the lower connecting rod (4) are respectively hinged to the base (1) and the hinge cup (2) via corresponding hinge pins (5), characterized in that: The upper connecting rod (3) has a first extrusion arc surface (6) and a second extrusion arc surface (7) near the end where it is hinged to the hinge cup (2) in the direction of the hinge cup (2). The hinge cup (2) is provided with a sliding linkage plate (8), and the linkage plate (8) is provided with a force-receiving end (81) that cooperates with the first extrusion arc surface (6) and the second extrusion arc surface (7). A buffer (9) is provided between the hinge cup (2) and the linkage plate (8); When the upper connecting rod (3) swings in the closing direction, the first extrusion arc surface (6) presses against the force-bearing end (81) to push the linkage plate (8) to slide and compress the buffer (9); when the upper connecting rod (3) swings in the opening direction, the second extrusion arc surface (7) presses against the force-bearing end (81) to push the linkage plate (8) to slide and compress the buffer (9).

2. The bidirectional buffer hinge according to claim 1, characterized in that: The second extrusion arc surface (7) is located at the end of the upper connecting rod (3) away from its hinge point with the hinge cup (2), and the first extrusion arc surface (6) and the second extrusion arc surface (7) are connected by a concave transition arc surface (10).

3. The bidirectional buffer hinge according to claim 1, characterized in that: The end of the second extrusion arc surface (7) is formed with a protruding tip that protrudes toward the force-bearing end (81).

4. The bidirectional buffer hinge according to claim 1, characterized in that: The first extrusion arc surface (6) and the second extrusion arc surface (7) are integrally stamped from metal sheet with the upper connecting rod (3).

5. The bidirectional buffer hinge according to claim 1, characterized in that: The first extrusion arc surface (6) and the second extrusion arc surface (7) are integrally injection molded from plastic material onto the insert (11), and the insert (11) is embedded in the mounting area (33) of the upper connecting rod (3) through a connecting mechanism.

6. The bidirectional buffer hinge according to claim 5, characterized in that: The connecting mechanism includes a plate (31) disposed on the upper connecting rod (3) and a connecting groove (12) disposed on the insert (11), wherein the plate (31) is inserted into the connecting groove (12) to connect the two.

7. The bidirectional buffer hinge according to claim 5 or 6, characterized in that: The inlay (11) has docking holes (13) on both sides. The hinge shaft (5) at the hinge joint between the upper connecting rod (3) and the hinge cup (2) passes through the hinge hole (32) of the upper connecting rod (3) and is inserted into the docking hole (13) so that the inlay (11) and the upper connecting rod (3) are fixed together.

8. The bidirectional buffer hinge according to claim 1, characterized in that: The hinge cup (2) is provided with a pressure plate (14), and a guide limiting groove is formed between the pressure plate (14) and the bottom of the hinge cup (2). The linkage plate (8) is slidably engaged in the guide limiting groove.

9. The bidirectional buffer hinge according to claim 1, characterized in that: The linkage plate (8) is provided with a receiving groove (82) in the middle. The buffer (9) includes a cylinder (91) and a piston rod (92). The cylinder (91) is placed in the receiving groove (82) and its tail abuts against the inner wall of the hinge cup (2). The piston rod (92) extends into the receiving groove (82) and abuts against the bottom of the receiving groove (82).

10. The bidirectional buffer hinge according to claim 8, characterized in that: The linkage plate (8) is provided with several levels of adjustment platforms (83), the pressure plate (14) is provided with adjustment grooves (15), and adjustment blocks (16) are slidably provided in the adjustment grooves (15). The adjustment blocks (16) are provided with stop platforms (17) that cooperate with the adjustment platforms (83). The stop platforms (17) cooperate with different adjustment platforms (83) to limit the maximum sliding stroke of the linkage plate (8).

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