Buffering hinge

Abstract

A buffering hinge comprises a base, a hinge cup, an upper connecting rod and a lower connecting rod, 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 a plurality of hinge shafts respectively, and the upper connecting rod and the lower connecting rod swing relative to the base and the hinge cup to achieve opening and closing of the hinge. The end, hinged to the hinge cup, of the upper connecting rod extends towards the hinge cup and is provided with a driving arm. A linkage plate is installed in the hinge cup in a sliding mode, and a power assisting arm matched with the driving arm is arranged on the linkage plate. A buffer is arranged in the hinge cup; in the hinge closing process, the driving arm swings along with the upper connecting rod around the hinged point of the driving arm and the hinge cup and abuts against the power assisting arm, the linkage plate is pushed to slide in the hinge cup, and the sliding action of the linkage plate compresses the buffer to generate buffering force.

Description

Technical Field

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

[0002] Hinges are key components in furniture cabinets that connect the cabinet body and the door panel. As people's requirements for the quality of home life increase, hydraulic hinges with buffer function have become the mainstream in the market. They can provide damping force when the door panel is closed, preventing the door panel from violently hitting the cabinet body and achieving silent closing.

[0003] However, existing buffer hinges still have the following obvious shortcomings in practical use and structural design: First, in existing technologies, to achieve the buffering function, designers often place the hydraulic damper and its transmission mechanism within the fixed base of the hinge or superimposed on the hinge arm. Because the buffer cylinder has a certain length and diameter, and requires a complex linkage transmission mechanism to transmit the damping force, the hinge base must reserve a large storage space, resulting in a heavy and bulky overall structure. This design not only occupies valuable storage space inside the cabinet, but its cumbersome appearance also clashes with the minimalist, lightweight, and refined design philosophy of modern furniture, severely impacting the overall aesthetics of the furniture.

[0004] Secondly, traditional four-bar linkage hinges rely primarily on rigid limits between the linkage components to stop movement when the door is opened to its maximum angle (i.e., fully open). Due to the motion characteristics of the four-bar mechanism and the assembly clearance between the components, when the door panel is opened to its limit position, it often cannot form a stable rigid support, but rather there is a certain sway angle (commonly known as "play").

[0005] This instability can lead to two serious consequences: First, the user experience is poor. The door panel is prone to shaking or rebounding when fully open, giving people a loose feeling. Secondly, it poses a safety hazard. When a user opens the door quickly, the inertia causes the hinge components to repeatedly strike the limiting part. This frequent impact and vibration will be directly transmitted to the connection between the hinge and the wooden door panel / cabinet. Long-term use can easily produce a "prying" effect, causing the fixing screws to loosen, strip, or even fall out of the board, causing the cabinet door to sag or fall off, which seriously shortens the service life of the furniture. 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 buffer hinge that is simple in structure, can reduce the size of the base and achieve an aesthetically pleasing and concealed appearance, and can also solve the problems of door panel shaking and screw loosening when fully open.

[0007] To achieve the above objectives, the present invention provides a buffer hinge, including a base, a hinge cup, an upper connecting rod, and a lower connecting rod. The two ends of the upper connecting rod and the lower connecting rod are respectively hinged to the base and the hinge cup through a plurality of hinge pins, so that the upper connecting rod and the lower connecting rod swing relative to the base and the hinge cup to realize the opening and closing of the hinge. The upper connecting rod has a drive arm extending towards the hinge cup at the end that is hinged to the hinge cup; The hinge cup is slidably installed with a linkage plate, and the linkage plate is provided with an assist arm that cooperates with the drive arm; A buffer is installed inside the hinge cup; During the hinge closing process, the drive arm swings around the hinge point with the upper connecting rod and presses against the assist arm, pushing the linkage plate to slide within the hinge cup. The sliding action of the linkage plate compresses the buffer to generate a buffering force.

[0008] Furthermore: a positioning baffle extending towards the linkage plate is provided inside the hinge cup, and a guide limiting groove is formed between the positioning baffle and the inner bottom of the hinge cup, and the linkage plate is slidably installed in the guide limiting groove.

[0009] 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 installed in the receiving groove, and the tail of the cylinder abuts against the inner wall of the hinge cup to maintain relative stillness; the piston rod extends into the receiving groove and faces the sliding direction of the linkage plate.

[0010] Furthermore, the linkage plate is also provided with an adjustment groove, which is connected to the receiving groove, and an adjustment block for controlling the buffer function is slidably installed in the adjustment groove. By sliding the adjusting block along the adjusting groove, the adjusting block can be positioned in either the first or second position. When in the first position, the adjusting block is located on the moving path of the piston rod end, and when the linkage plate is slid under force, it is pressed into the piston rod through the adjusting block; When in the second position, the adjusting block is offset from the end of the piston rod, and the piston rod is not compressed when the linkage plate slides.

[0011] Furthermore: the bottom of the adjusting block extends outward with an anti-detachment ring, and the bottom of the adjusting groove is provided with an anti-detachment limiting groove that cooperates with the anti-detachment ring, and the anti-detachment ring is movably accommodated in the anti-detachment limiting groove.

[0012] Furthermore, a top block extends from the adjusting block toward the receiving groove. When the adjusting block is in the first position, the top block is positioned directly opposite the end of the piston rod.

[0013] Furthermore: the upper connecting rod extends towards the hinge cup and is provided with a cam, and the assist arm is located below the cam; when the hinge is opened to a predetermined angle, the cam rotates to the position of pressing the assist arm, so that the assist arm is pressed and a clamping friction force is generated between it and the inner wall of the hinge cup, thereby maintaining the hinge in the open state.

[0014] Furthermore, the assisting arm is an elastic cantilever structure or rib structure. When the cam presses against the assisting arm, the assisting arm undergoes elastic deformation to fit tightly against the inner wall of the hinge cup.

[0015] Furthermore, a return torsion spring is fitted on the hinge shaft connecting the upper connecting rod and the base. One support leg of the return torsion spring abuts against the lower connecting rod, and the other support leg abuts against the elastic adjustment device provided on the base.

[0016] Furthermore: the elastic adjustment device includes an adjustment bolt rotatably mounted on the base and an eccentric cam disk driven by the adjustment bolt, and the other support leg of the reset torsion spring abuts against the cam surface of the eccentric cam disk.

[0017] The beneficial effects of this invention are as follows: 1. This invention innovatively integrates and hides the buffer and main transmission components (linkage plate, adjusting block, etc.) inside the hinge cup. This layout transfers the large functional components to the hinge cup embedded in the door panel, thereby completely freeing up the space of the base. This eliminates the need for a large and bulky base to accommodate the hydraulic cylinder, allowing it to be made thinner and more refined. This not only greatly enhances the overall aesthetics of the furniture hardware, catering to the aesthetic needs of modern minimalism, but also saves space inside the cabinet.

[0018] 2. To address the issue of cabinet damage caused by wobbling when hinges are fully open, this invention features a cleverly designed cam and assist arm mechanism. When the hinge is opened to its maximum angle (a predetermined angle), the cam extending from the upper linkage rotates to a specific position, forcibly pressing the assist arm on the linkage plate. This causes the assist arm to elastically deform and firmly press against the inner wall of the hinge cup. This eliminates the play and wobbling of the four-bar linkage at its extreme positions, providing users with a solid, stable, and premium feel.

[0019] 3. By utilizing friction to absorb the inertial impact of opening the door, the vibration generated by hard impact is prevented from being transmitted to the screw holes, thus effectively avoiding loosening of connecting screws or cracking of boards due to long-term repeated impacts, and significantly extending the service life of the furniture.

[0020] 4. This invention incorporates a sliding adjustment block on the linkage plate as a "clutch switch." Users can easily change the force transmission path and freely choose to activate or deactivate the buffer function by simply moving the adjustment block, without disassembling the hinge.

[0021] 5. This invention integrates a spring adjustment device consisting of an adjusting bolt and an eccentric cam plate on the base. By rotating the adjusting bolt, the eccentric cam plate can be rotated, changing the preload angle of the return torsion spring support foot, thereby achieving precise adjustment of the hinge return force (closing pull). This function allows the same hinge to perfectly adapt to cabinet doors of different weights and sizes, solving the problems of heavy doors not closing tightly and light doors making a loud impact noise when closing, ensuring consistent closing performance in various application scenarios. Attached Figure Description

[0022] Figure 1 This is an assembly rendering of the hinge of the present invention in the open state.

[0023] Figure 2 This is an assembly rendering of the hinge of the present invention in the closed state.

[0024] Figure 3 This is a cross-sectional view of the hinge of the present invention in the closed state.

[0025] Figure 4 This is an exploded view of the structure of the present invention.

[0026] Figure 5 , 6 Figures 7 and 8 show the effect of the cam and the assist arm working together in this invention.

[0027] Figure 8 This is an exploded view of the structure of the present invention with the base and hinge cup concealed.

[0028] Figure 9 This is a schematic diagram of the linkage plate structure in this invention.

[0029] Figure 10 This is a diagram showing the effect of the adjustment block being in a separated state in this invention.

[0030] Explanation of reference numerals in the attached drawings: 1. Base; 2. Hinge cup; 21. Positioning baffle; 22. Guide limiting groove; 3. Upper connecting rod; 31. Drive arm; 32. Cam; 4. Lower connecting rod; 5. Linkage plate; 51. Assist arm; 52. Receiving groove; 53. Adjusting groove; 54. Limiting groove; 55. Top block; 6. Buffer; 61. Cylinder body; 62. Piston rod; 8. Adjusting block; 81. Anti-detachment ring; 9. Return torsion spring; 91. Adjusting bolt; 92. Eccentric cam disc. Detailed Implementation

[0031] The objective of this invention is achieved in the following manner: a buffer hinge includes a base 1, a hinge cup 2, an upper connecting rod 3, and a lower connecting rod 4. 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 several hinge pins, allowing the upper connecting rod 3 and the lower connecting rod 4 to swing relative to the base 1 and the hinge cup 2 to open and close the hinge. A drive arm 31 extends from the end of the upper connecting rod 3 that is hinged to the hinge cup 2 towards the hinge cup 2. A linkage plate 5 is slidably installed inside the hinge cup 2, and an assist arm 51 that cooperates with the drive arm 31 is provided on the linkage plate 5. A buffer 6 is installed inside the hinge cup 2. During the hinge closing process, the drive arm 31 swings with the upper connecting rod 3 around its hinge point with the hinge cup 2 and presses against the assist arm 51, pushing the linkage plate 5 to slide within the hinge cup 2. The sliding action of the linkage plate 5 compresses the buffer 6 to generate a buffering force.

[0032] In this embodiment: when the hinge is closed, the drive arm 31 rotates with the upper connecting rod and cuts downward, making interference contact with the assist arm 51 on the linkage plate 5. Through this contact, the drive arm 31 converts the rotational torque into a horizontal thrust, forcing the linkage plate 5 to make a linear displacement within the hinge cup, thereby compressing the buffer 6.

[0033] The core advantage of this solution lies in its optimal space utilization. Traditional soft-close hinges often place the hydraulic system and complex slider mechanism on the base 1 or attach it to the connecting rod, resulting in a bulky and cumbersome base. This invention, however, integrates the entire soft-close trigger mechanism and hides it on the hinge cup 2 side. Since the hinge cup is embedded inside the cabinet door panel, this design successfully transfers the bulk burden, allowing the exposed base 1 to be designed to be very thin and compact, greatly enhancing the refinement and aesthetics of the furniture hardware.

[0034] In one embodiment: a positioning baffle 21 extending toward the linkage plate 5 is provided inside the hinge cup 2, and a guide limiting groove 22 is formed between the positioning baffle 21 and the inner bottom of the hinge cup 2, and the linkage plate 5 is slidably installed in the guide limiting groove 22.

[0035] In this embodiment: a positioning baffle 21 is formed inside the hinge cup 2 by an integral stamping process. This baffle and the bottom of the hinge cup together form a rectangular channel structure, namely a guide limiting groove 22. The linkage plate 5 is restricted to move within this groove.

[0036] This structure serves to provide forced guidance and prevent bouncing. During the instant of buffering force application, the linkage plate 5 bears a significant thrust; without restraint, it could easily warp vertically or shift laterally. The guide and limit groove 22 ensures that the linkage plate can only slide smoothly along the axial direction, guaranteeing a smooth buffering feel and preventing failure due to component jamming.

[0037] In one embodiment: the linkage plate 5 is provided with a receiving groove 52 in the middle, and the buffer 6 includes a cylinder 61 and a piston rod 62; the cylinder 61 is installed in the receiving groove 52, and the tail of the cylinder 61 abuts against the inner wall of the hinge cup 2 to maintain relative stillness; the piston rod 62 extends into the receiving groove 52 and is oriented toward the sliding direction of the linkage plate 5.

[0038] This embodiment employs a layout where the cylinder is stationary and the piston rod is passively compressed. The middle of the linkage plate 5 is hollowed out to form a receiving groove 52, in which the buffer 6 is placed. Crucially, the tail of the cylinder 61 directly abuts against the fixed inner wall of the hinge cup 2; therefore, the cylinder remains stationary throughout the entire operation. When the linkage plate 5 is driven to slide backward, its front wall actively meets the stationary piston rod 62, pressing it into the cylinder.

[0039] One key point to note is that this embodiment utilizes the internal space of the linkage plate to house the buffer, avoiding excessive stacking height and allowing for a thinner hinge cup. Compared to a cylinder-moving design, the stationary cylinder eliminates the additional pressure on the oil seal caused by high-speed reciprocating motion, reducing the risk of oil leakage.

[0040] In one embodiment: the linkage plate 5 is further provided with an adjustment groove 53, which is connected to the receiving groove 52. An adjustment block 8 for controlling the buffer function is slidably installed in the adjustment groove 53. By moving the adjustment block 8 along the adjustment groove 53, the adjustment block 8 can be in a first position or a second position: when in the first position, the adjustment block 8 is located on the moving path of the piston rod 62 end, and when the linkage plate 5 is slid under force, it presses the piston rod 62 through the adjustment block 8; when in the second position, the adjustment block 8 is offset from the end of the piston rod 62, and the linkage plate 5 does not compress the piston rod 62 when it slides.

[0041] In this embodiment, the adjusting block 8 acts as a "mechanical clutch".

[0042] First position in the on state: The adjusting block slides to the front of the piston rod, filling the gap between the linkage plate and the piston rod, and establishing a bridge for force transmission.

[0043] Second position (disconnected): The adjusting block slides open, creating a cavity in front of the piston rod. When the linkage plate moves, the piston rod extends directly into the cavity and is not subjected to force.

[0044] This embodiment enables selectability of the buffer function. Users can switch between "silent buffer mode" and "normal quick-closing mode" simply by tossing a switch without disassembling the hinge, perfectly adapting to door panels of different weights or different user habits.

[0045] In one embodiment: the bottom of the adjusting block 8 extends outward with an anti-detachment ring 81, and the bottom of the adjusting groove 53 is provided with an anti-detachment limiting groove 54 that cooperates with the anti-detachment ring 81, and the anti-detachment ring 81 is movably accommodated in the anti-detachment limiting groove 54.

[0046] The anti-slip ring 81 and the anti-slip limiting groove 54 form an inverted or interference fit structure, providing a damping feel and limiting function for the sliding of the adjusting block.

[0047] At the same time, it prevents the adjustment block from sliding off its own during the vibration of repeated opening and closing of the door panel, ensuring the stability of the opening / closing state.

[0048] In one embodiment: a top block 55 extends from the adjusting block 8 toward the receiving groove 52. When the adjusting block 8 is in the first position, the top block 55 is positioned opposite the end of the piston rod 62.

[0049] In this embodiment: the top block 55 is a specially designed raised contact point on the adjusting block, used to precisely abut against the piston rod end face. This ensures that the force point is concentrated at the center of the piston rod, avoiding uneven loading that could cause the piston rod to bend or wear.

[0050] In one embodiment: the upper connecting rod 3 extends toward the hinge cup 2 and is provided with a cam 32, and the assist arm 51 is located below the cam 32; when the hinge is opened to a predetermined angle, the cam 32 rotates to the position of pressing the assist arm 51, so that the assist arm 51 is pressed and a clamping friction force is generated between it and the inner wall of the hinge cup 2, thereby maintaining the open state of the hinge.

[0051] This embodiment is the core mechanism of the present invention that solves the problem of "shaking when fully open". When the door panel is opened to the maximum angle, such as 105 degrees, the cam 32 at the end of the upper connecting rod 3 rotates to the lowest point or the maximum radius of its stroke. At this time, the cam 32, like a road roller, presses vertically downwards against the auxiliary arm 51 located below it. This vertical pressure forces the auxiliary arm 51 to press tightly against the metal inner wall of the hinge cup 2.

[0052] The immense static friction generated by the "cam pressing down" locks the four-bar linkage in the fully open position, completely eliminating the looseness and wobbling of traditional hinges when fully open. This friction-holding mechanism replaces the traditional hard metal impact limiter, flexibly absorbing the inertial impact of opening the door. This effectively prevents vibrations caused by repeated impacts from being transmitted to the screw holes, thus solving the problem of connecting screws being easily loosened or stripped by impact forces, and extending the cabinet's lifespan.

[0053] In one embodiment, the assist arm 51 is an elastic cantilever structure or rib structure. When the cam 32 presses against the assist arm 51, the assist arm 51 undergoes elastic deformation to fit tightly against the inner wall of the hinge cup 2. The assist arm 51 is not a rigid iron block, but a rib or cantilever with a certain degree of toughness. When the cam presses down, it can undergo slight bending deformation like a spring. The elastic deformation of the material is used to generate continuous and stable positive pressure, which is then converted into stable frictional force, avoiding jamming or excessive wear due to excessive rigidity.

[0054] In one embodiment: a return torsion spring 9 is fitted onto the hinge shaft connecting the upper link 3 and the base 1. One support leg of the return torsion spring 9 abuts against the lower link 4, and the other support leg abuts against a spring adjustment device mounted on the base 1. The return torsion spring 9 is mounted on the upper link shaft, but cleverly utilizes a long lever arm to act directly on the lower link 4, driving the lower link to reset the entire four-bar linkage. This makes the spring force transmission more direct and the closing torque more uniform.

[0055] In one embodiment, the spring adjustment device includes an adjusting bolt 91 rotatably mounted on a base 1 and an eccentric cam disk 92 driven by the adjusting bolt 91. The other support leg of the return torsion spring 9 abuts against the cam surface of the eccentric cam disk 92. The adjusting bolt 91 and the eccentric cam disk 92 are linked. When the bolt is rotated, the cam disk rotates, and its thickness change pushes the torsion spring leg to move, thereby tightening or loosening the torsion spring. This achieves stepless adjustment of the return force. Installers can adjust the spring preload according to the actual weight of the door panel, solving the problems of heavy doors not closing tightly and light doors closing noisily.

[0056] In summary, the complete operational process of the invented buffer hinge in practical use is as follows: 1. Closure process buffer energy absorption phase: When the user applies force to push the door panel, causing it to move from the open state to the closed state, the four-bar linkage consisting of the base 1, upper link 3, lower link 4 and hinge cup 2 begins to retract and fold.

[0057] The upper connecting rod 3 rotates around its hinge point with the hinge cup 2, causing the integrally formed drive arm 31 to swing downward. As the closing angle increases, for example, into the final 30-degree range, the front end of the drive arm 31 contacts and presses against the assist arm 51 of the linkage plate 5. The drive arm 31 continues to apply a backward thrust, overcoming the return spring and frictional resistance, pushing the linkage plate 5 to slide linearly along the guide limiting groove 22 into the hinge cup 2.

[0058] At this moment, the adjusting block 8, located at the first position of the adjusting groove 53, retracts along with the linkage plate 5. The top block 55 at the front end of the adjusting block 8 collides head-on with the stationary buffer piston rod 62. As the linkage plate continues to retract, the piston rod 62 is forcibly pressed into the cylinder 61. The hydraulic oil in the cylinder is forced to flow through the tiny damping orifice, generating enormous hydraulic resistance. This resistance is transmitted in reverse to the linkage plate, the drive arm, and ultimately the door panel, thereby effectively dissipating the kinetic energy of the door panel and causing the door panel to decrease in speed smoothly in the final stage of closing, achieving a gentle and silent automatic closing.

[0059] 2. Opening process: When the user pulls the door panel to open, the above process proceeds in reverse. The upper linkage 3 rotates in the opposite direction, the drive arm 31 lifts, and the pressure on the linkage plate 5 is released. The linkage plate 5 then resets forward under the action of the return spring inside the buffer.

[0060] When the door panel is opened to the maximum predetermined angle, such as 105 degrees, the upper linkage 3 rotates to its limit position. At this time, the cam 32 specially provided at the front end of the upper linkage 3 rotates to the lowest point and presses the assist arm 51 on the linkage plate vertically downward.

[0061] Under the strong pressure of the cam 32, the elastic assist arm 51 undergoes a slight elastic deformation and fits tightly against the inner bottom wall of the hinge cup 2. At this time, a huge static friction force is generated between the assist arm 51 and the inner wall of the hinge cup, forming a "friction locking" state. This locking force counteracts the rebound inertia that the door panel may generate and eliminates the misalignment of the linkage mechanism. Therefore, the door panel will stop steadily when fully open without shaking or trembling. At the same time, this flexible friction contact replaces the traditional hard metal impact limiter, completely eliminating the impact vibration when the door is fully opened, thereby protecting the tightness of the hinge and cabinet connecting screws and extending the service life of the furniture.

[0062] 3. Intensity adjustment process: If the user finds that the door is difficult to close or makes a loud slamming sound when closing, they can use a screwdriver to rotate the adjusting bolt 91 at the end of the base 1. The adjusting bolt 91 drives the eccentric cam disk 92 to rotate, changing the thickness of the contact between the eccentric cam disk and the return torsion spring, thus altering the support angle of the support foot of the return torsion spring 9, thereby increasing or decreasing the preload of the torsion spring. This adjustment process, by changing the force state of the lower connecting rod 4, ultimately achieves precise control over the closing tension of the entire hinge, and therefore can be widely used.

[0063] 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.

[0064] 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 buffer 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 a plurality of hinge pins, such that the upper connecting rod (3) and the lower connecting rod (4) swing relative to the base (1) and the hinge cup (2) to realize the opening and closing of the hinge, characterized in that: The upper connecting rod (3) has a drive arm (31) extending towards the hinge cup (2) at one end that is hinged to the hinge cup (2). The hinge cup (2) is slidably installed with a linkage plate (5), and the linkage plate (5) is provided with an assist arm (51) that cooperates with the drive arm (31). A buffer (6) is installed inside the hinge cup (2); During the hinge closing process, the drive arm (31) swings with the upper link (3) around its hinge point with the hinge cup (2) and presses against the assist arm (51), pushing the linkage plate (5) to slide within the hinge cup (2). The sliding action of the linkage plate (5) compresses the buffer (6) to generate a buffering force.

2. The buffer hinge according to claim 1, characterized in that: The hinge cup (2) is provided with a positioning baffle (21) extending towards the linkage plate (5). The positioning baffle (21) and the inner bottom of the hinge cup (2) form a guide limiting groove (22). The linkage plate (5) is slidably installed in the guide limiting groove (22).

3. The buffer hinge according to claim 1, characterized in that: The linkage plate (5) is provided with a receiving groove (52) in the middle. The buffer (6) includes a cylinder (61) and a piston rod (62). The cylinder (61) is installed in the receiving groove (52), and the tail of the cylinder (61) abuts against the inner wall of the hinge cup (2) to maintain relative stillness. The piston rod (62) extends into the receiving groove (52) and is oriented toward the sliding direction of the linkage plate (5).

4. The buffer hinge according to claim 3, characterized in that: The linkage plate (5) is also provided with an adjustment groove (53), which is connected to the receiving groove (52). An adjustment block (8) for controlling the buffer function is slidably installed in the adjustment groove (53). By sliding the adjusting block (8) along the adjusting groove (53), the adjusting block (8) can be positioned in either the first or second position: When in the first position, the adjusting block (8) is located on the moving path of the piston rod (62) end, and when the linkage plate (5) is slid under force, it is pressed into the piston rod (62) through the adjusting block (8). When in the second position, the adjusting block (8) is offset from the end of the piston rod (62), and the linkage plate (5) does not compress the piston rod (62) when sliding.

5. The buffer hinge according to claim 4, characterized in that: The bottom of the adjusting block (8) extends outward with an anti-detachment ring (81), and the bottom of the adjusting groove (53) is provided with an anti-detachment limiting groove (54) that cooperates with the anti-detachment ring (81). The anti-detachment ring (81) is movably accommodated in the anti-detachment limiting groove (54).

6. The buffer hinge according to claim 4, characterized in that: The adjusting block (8) has a top block (55) extending toward the receiving groove (52). When the adjusting block (8) is in the first position, the top block (55) is positioned opposite the end of the piston rod (62).

7. The buffer hinge according to claim 1, characterized in that: The upper connecting rod (3) extends toward the hinge cup (2) and is provided with a cam (32). The assist arm (51) is located below the cam (32). When the hinge is opened to a predetermined angle, the cam (32) rotates to press the assist arm (51) so that the assist arm (51) is pressed and generates a clamping friction force between it and the inner wall of the hinge cup (2), thereby maintaining the hinge in the open state.

8. The buffer hinge according to claim 7, characterized in that: The assist arm (51) is an elastic cantilever structure or rib structure. When the cam (32) presses the assist arm (51), the assist arm (51) undergoes elastic deformation to fit tightly against the inner wall of the hinge cup (2).

9. The buffer hinge according to claim 1, characterized in that: A reset torsion spring (9) is fitted on the hinge shaft connecting the upper connecting rod (3) and the base (1). One support leg of the reset torsion spring (9) abuts against the lower connecting rod (4), and the other support leg abuts against the elastic adjustment device set on the base (1).

10. The buffer hinge according to claim 9, characterized in that: The elastic adjustment device includes an adjustment bolt (91) rotatably mounted on a base (1) and an eccentric cam disk (92) driven by the adjustment bolt (91), with the other support foot of the reset torsion spring (9) abutting against the cam surface of the eccentric cam disk (92).

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