Hardware hinge with opening and closing bidirectional buffering function

Abstract

The present application relates to the technical field of furniture hardware fittings, and particularly relates to a hardware hinge with opening and closing bidirectional buffering function, which comprises a hinge cup, a hinge arm, an upper connecting arm and a lower connecting arm, the hinge arm is internally provided with a buffer and a movable frame sliding along the extension direction of a piston rod. The movable frame comprises a connecting part and two linkage parts. The upper connecting arm is provided with a closing driving arm and a closing hinge shaft, the closing hinge shaft and the connecting part form a separable pressing fit; the lower connecting arm is provided with an opening driving arm and a guide pin, the two ends of the guide pin are respectively slidably arranged in a connecting groove. The closing hinge shaft and the guide pin respectively drive the movable frame to compress the same buffer at the closing end section and the opening end section of the hinge. The long-strip connecting groove forms an idle stroke, so that the opening driving structure moves relative to the movable frame in the middle stroke, and provides movement avoidance when closing buffering. The present application can reduce the cabinet door closing collision and the limiting impact of the maximum opening position, reduce the cabinet door shaking and the hinge abnormal sound, and has the characteristics of compact structure, balanced stress and stable work.

Description

Technical Field

[0001] This invention relates to the field of furniture hardware accessories technology, specifically to a hardware hinge with a two-way opening and closing buffer function. Background Technology

[0002] Hardware hinges are typically installed between cabinet doors and the cabinet body to support the doors and guide their rotation relative to the cabinet body. Common furniture hardware hinges generally include a hinge cup, a hinge arm, and upper and lower connecting arms that connect the hinge cup and the hinge arm. The upper and lower connecting arms, the hinge cup, and the hinge arm together form a linkage-type opening and closing mechanism, allowing the cabinet door to move between the closed position and the fully open position.

[0003] Cabinet doors have a certain speed and inertia during the closing process. If the cabinet door collides directly with the cabinet body, it will not only generate significant closing noise, but may also impact the door panel, cabinet body, and hinges. To address these issues, some existing hardware hinges incorporate a damper inside the hinge arm. The damper is compressed by the upper arm, lower arm, or additional drive components as the cabinet door approaches the fully closed position, thereby reducing the speed of the door during the final closing phase.

[0004] However, existing hinge buffer mechanisms are typically designed only for the closing stroke of the cabinet door, primarily to prevent the door from impacting the cabinet body when closed, without effectively controlling the movement of the door before it reaches its maximum opening position. In actual use, users usually apply a certain amount of force when opening the cabinet door. The door and hinge linkage gain speed during the opening process and possess inertia to continue moving in the opening direction. Especially when the cabinet door is heavy, the opening speed is fast, or the user applies significant force, the door still retains considerable kinetic energy when reaching its maximum opening angle.

[0005] Without a buffer to prevent opening, the kinetic energy is primarily borne by the mechanical limiting components inside the hinge. When the cabinet door reaches its maximum open position, rigid contact occurs between the connecting arm, hinge pin, limiting protrusion, or other limiting components, resulting in a momentary impact. This momentary impact easily produces a noticeable opening slam sound and subjects the hinge connection points to a significant peak load.

[0006] Meanwhile, because the cabinet door, cabinet body, and hinge components all have a certain degree of elastic deformation, and assembly gaps are unavoidable at each hinge position, the cabinet door may spring back after reaching its maximum opening position, and experience one or more reciprocating wobbling near the maximum opening position. As a result, the mechanical limiting components of the hinge may be subjected to continuous or repeated impacts.

[0007] After prolonged use, the repeated impacts described above can easily cause deformation of the connecting arm, wear of the hinge pin, enlargement of the hinge hole, wear of the limiting part, or loosening of the hinge as a whole. This can lead to problems such as cabinet door sagging, increased opening and closing gaps, changes in the maximum opening angle, and abnormal noises when opening the door. These problems are more pronounced for cabinet doors that are heavier or larger in size, thus necessitating further improvements. Summary of the Invention

[0008] The main objective of this invention is to provide a hardware hinge with a two-way buffer function for opening and closing, so that the cabinet door can obtain a damping effect at both the closing and opening stages, thereby reducing the impact on the cabinet body when the cabinet door is closed and the impact on the mechanical limiting components of the hinge when the cabinet door is opened to the maximum angle.

[0009] To achieve the above objectives, this invention provides a hardware hinge with a bidirectional opening and closing buffer function, comprising a hinge cup, a hinge arm, an upper connecting arm, and a lower connecting arm. The two ends of the upper and lower connecting arms are respectively hinged to the hinge cup and the hinge arm. The hinge cup, hinge arm, upper connecting arm, and lower connecting arm together constitute a linkage-type opening and closing mechanism. The hinge cup is used to install on a cabinet door, and the hinge arm is used to install directly or via a mounting base on the cabinet body. When the cabinet door opens or closes, the hinge cup moves relative to the hinge arm, and the upper and lower connecting arms swing around their respective hinge axes. A buffer and a movable frame are provided inside the hinge arm. The movable frame is slidably arranged along the extension and retraction direction of the buffer piston rod, and the piston rod of the buffer is connected to the movable frame.

[0010] In a preferred embodiment of the invention, the main body of the buffer is fixed relative to the hinge arm, and the movable frame slides reciprocally relative to the hinge arm and the main body of the buffer. When the movable frame moves in the compression direction, it pushes the piston rod to retract into the buffer body, thereby generating a damping force in the buffer.

[0011] The movable frame includes a connecting part and two linkage parts located on both sides of the connecting part. The connecting part connects the two linkage parts and forms a transmission relationship with the closing drive structure and the piston rod. Each of the two linkage parts has an elongated connecting groove, and the two connecting grooves are positioned correspondingly to each other. The connecting groove extends along the sliding direction of the movable frame, and the length of the connecting groove is greater than the diameter of the guide pin, allowing the guide pin to move relative to the movable frame within the connecting groove.

[0012] The upper arm has two closing drive arms and a closing hinge pin connecting the two closing drive arms. The two closing drive arms are positioned to the left and right of the upper arm, and the closing hinge pin is laterally connected between the two closing drive arms.

[0013] The closing hinge and the connecting part of the movable frame form a separable, pressure-resistant fit. When the hinge is not in the final closed position, the closing hinge is separated from the connecting part, or the closing hinge does not apply a force to the connecting part that compresses the buffer of the movable frame.

[0014] When the hinge reaches its final closed position, the closing hinge pin moves with the upper connecting arm to the corresponding force-bearing position of the connecting part and presses against the connecting part. As the upper connecting arm continues to swing in the closing direction, the closing hinge pin pushes the connecting part, causing the movable frame to move in the direction of compressing the buffer.

[0015] The lower connecting arm has two opening drive arms and a guide pin connecting the two opening drive arms. The two opening drive arms are positioned to the left and right of the lower connecting arm, and the guide pin is laterally connected between the two opening drive arms. The two ends of the guide pin are slidably placed in corresponding connecting grooves on the two linkage parts. When the lower connecting arm swings, the guide pin moves along the corresponding motion trajectory with the opening drive arms and can slide relative to the connecting grooves.

[0016] During the initial and middle stages of hinge opening, the guide pin moves relative to the hinge within the empty travel range formed by the connecting groove. The guide pin has not yet pressed against the end wall of the connecting groove used to drive the movable frame, so it will not continuously push the movable frame to compress the buffer.

[0017] As the hinge enters the final opening position, the guide pin moves to the opening drive end wall of the connecting groove. As the lower arm continues to swing in the opening direction, the guide pin presses against the opening drive end wall of the connecting groove and pushes the movable frame to move in the direction of the compression buffer via two linkages.

[0018] Thus, the closing hinge and the guide pin drive the same movable frame at the closing and opening ends of the hinge, respectively, and cause the movable frame to act on the same buffer in the same compression direction.

[0019] This invention does not simply install the opening drive component and the closing drive component simultaneously in a common buffer hinge, but rather forms a staged transmission relationship through a movable frame, a separable closing pressure structure, and an opening pin groove structure with free stroke.

[0020] The closing hinge acts on the movable frame through a separable pressing mechanism, allowing the closing drive structure to engage at the closing end and automatically disengage from the movable frame after the hinge leaves the closing end.

[0021] The guide pin slides into the long strip connecting groove, which allows the opening drive structure and the movable frame to maintain the necessary structural connection while also generating relative displacement during the non-opening buffer phase, thereby creating a delayed triggering and motion avoidance for the opening buffer.

[0022] The elongated connecting groove serves as both a transmission structure for transmitting driving force at the end of the opening section and a clearance structure for switching between the opening and closing driving structures.

[0023] Furthermore, the hinge arm has a receiving cavity, and a sleeve is fixedly installed in the receiving cavity. The sleeve has a mounting hole extending along the extension and retraction direction of the piston rod, and the main body of the buffer is fixedly installed in the mounting hole.

[0024] By fixing and supporting the main body of the buffer with a sleeve, the main body of the buffer and the movable frame can maintain a relatively stable positional relationship, and the extension and retraction direction of the piston rod is consistent with the sliding direction of the movable frame.

[0025] Furthermore, the piston rod of the buffer extends from the mounting hole toward one end of the movable frame, and the connecting part of the movable frame is provided with a pressing boss, the end of the piston rod abutting against the pressing boss.

[0026] When the movable frame is driven by the closing hinge or guide pin, the pressing boss applies pressure to the end of the piston rod, causing the piston rod to retract along its axial direction. The pressing boss is preferably located in the transverse middle of the connection, so that the pressure acting on the piston rod is as close as possible to the piston rod axis.

[0027] The piston rod end and the pressing boss adopt an abutment force transmission structure, which can both enable the movable frame to push the piston rod to retract and allow the piston rod to push the movable frame back to the initial position when the buffer is reset.

[0028] Without changing the basic working principle of the present invention, the piston rod end can also cooperate with the connecting part through a connector, a snap-fit ​​structure or other connecting structure.

[0029] Furthermore, the connecting part and the two linkage parts together form an inverted U-shaped structure with the opening facing the sleeve, and the two linkage parts are located on both sides of the sleeve.

[0030] The inverted U-shaped movable frame spans the outside of the sleeve, which allows the movable frame to simultaneously form the guide section and the connecting groove installation section on both sides of the sleeve without significantly increasing the height and width of the hinge arm.

[0031] Furthermore, guide grooves extending along the extension and retraction direction of the piston rod are provided on both sides of the sleeve, and the two linkage parts are slidably installed in the corresponding guide grooves.

[0032] Two guide grooves guide the movable frame synchronously from the left and right sides, so that the movable frame can slide along the extension and retraction direction of the piston rod when driven by the closing hinge or guide pin.

[0033] Furthermore, the two closing drive arms are arranged symmetrically to the left and right of the upper connecting arm, and the closing hinge shaft is laterally connected between the two closing drive arms and located within the movement area of ​​the connecting part.

[0034] The two closing drive arms support the two ends of the closing hinge shaft respectively, which can reduce the deflection caused by the force on the cantilever of the closing hinge shaft on one side, and make the force of the closing hinge shaft on the connection part more balanced.

[0035] Furthermore, the two opening drive arms are symmetrically arranged relative to the lower connecting arm, and the guide pin is laterally connected between the two opening drive arms. The axis of the guide pin is parallel to the hinge axis of the lower connecting arm and the hinge arm.

[0036] The two ends of the guide pin act on the connecting grooves on both sides of the movable frame, so that the opening driving force is transmitted to the movable frame through the two linkage parts, reducing the possibility of the movable frame twisting and jamming when it is driven by one side.

[0037] Furthermore, the length of the connecting groove is greater than the diameter of the guide pin, so as to create a free stroke between the guide pin and the two end walls of the connecting groove.

[0038] The free travel refers to the range of motion in which the guide pin can move relative to the connecting groove without pressing against the end wall of the connecting groove used to push the movable frame to compress the buffer.

[0039] The length of the idle stroke can be set according to the maximum opening angle of the hinge, the opening buffer start angle, the effective stroke of the buffer, and the movement trajectory of the lower connecting arm.

[0040] Furthermore, the sleeve is provided with a connecting seat, which is positioned and connected to the hinge arm via a first locating pin.

[0041] A positioning platform is provided at the end of the sleeve away from the movable frame. A second positioning pin is fixed on the hinge arm. The second positioning pin is located below the positioning platform and forms a support and limiting cooperation with the positioning platform.

[0042] The first positioning pin works with the connecting seat to position the front or middle part of the sleeve; the second positioning pin works with the positioning platform to support and limit the tail of the sleeve.

[0043] By using the above-mentioned positioning relationships, the possibility of the sleeve moving axially, swinging up and down, or rotating when the buffer is repeatedly compressed can be reduced.

[0044] The buffer is preferably a linear damper with an automatic reset function. When the external compression force on the movable frame is released, the piston rod can extend outward under the action of the internal reset structure of the buffer and push the movable frame to move in the reset direction.

[0045] The buffer can be a hydraulic buffer, a pneumatic buffer, a hybrid oil-air buffer, or other linear buffer devices that can generate damping when the piston rod retracts.

[0046] The beneficial effects of this invention are: 1. This invention utilizes the closing hinge and guide pin to drive the same movable frame at the closing and opening ends respectively, enabling the same buffer to generate closing damping and opening damping respectively. Compared with hinges that only have a closing damping function, this invention can absorb part of the kinetic energy of the cabinet door and hinge moving components before the cabinet door reaches its maximum opening position, reducing the instantaneous impact on the mechanical limiting components.

[0047] 2. This invention achieves bidirectional buffering for both opening and closing using a single buffer, eliminating the need for separate opening and closing buffers within the hinge arm. This reduces the number of buffers and their mounting components, lowers the internal space occupied by the hinge arm, and helps maintain the original compact size of the concealed hardware hinge.

[0048] 3. This invention converts the motions of the upper and lower connecting arms at different stages into linear compression motions in the same direction using a single movable frame. The upper connecting arm forms a closing drive path by closing the drive arm and closing the hinge, while the lower connecting arm forms an opening drive path by opening the drive arm, guide pin, and connecting groove. Both drive paths ultimately act on the same movable frame, which then pushes the same piston rod to retract, thus avoiding the need for additional reversing gears, complex cams, or multi-stage switching mechanisms.

[0049] 4. At the final closing stage, the closing hinge pin contacts the connecting part and transmits the closing driving force; when the hinge leaves the final closing stage, the closing hinge pin releases its pressing relationship with the connecting part. This separable transmission method allows the closing drive structure to engage only within the angle range where closing buffering is required, avoiding continuous dragging of the movable frame by the closing drive structure throughout the entire opening and closing process of the hinge.

[0050] 5. The guide pin and the elongated connecting groove cooperate to form a free stroke, giving the opening drive structure a delayed triggering function. In the initial and middle stages of opening, the guide pin moves relative to the connecting groove without pushing the movable frame to compress the buffer, allowing the cabinet door to pass through the main opening stroke relatively smoothly. Attached Figure Description

[0051] Figure 1 This is one of the schematic diagrams of the overall three-dimensional structure of the hardware hinge of the present invention in the open state.

[0052] Figure 2 This is the second schematic diagram of the overall three-dimensional structure of the hardware hinge of the present invention in the open state.

[0053] Figure 3 This is one of the schematic diagrams of the overall three-dimensional structure of the hardware hinge of the present invention in the closed state.

[0054] Figure 4 This is the second schematic diagram of the overall three-dimensional structure of the hardware hinge of the present invention in the closed state.

[0055] Figure 5 This is an exploded structural diagram of the hardware hinge of the present invention.

[0056] Figure 6 This is one of the exploded structural diagrams of the hardware hinge with hidden hinge arm of the present invention.

[0057] Figure 7 This is the second exploded structural diagram of the hardware hinge with hidden hinge arm of the present invention.

[0058] Figure 8 This is a schematic diagram of the hardware hinge of the present invention with the hinge in the open state after the hinge arm is hidden.

[0059] Figure 9 This is one of the structural schematic diagrams of the hardware hinge of the present invention, showing the hinge in a half-open state after the hinge arm is hidden.

[0060] Figure 10 This is the second schematic diagram of the hardware hinge structure of the present invention, where the hinge is in a half-open state after the hinge arm is hidden.

[0061] Figure 11 This is a schematic diagram of the hardware hinge structure of the present invention with the hinge arm hidden and the hinge in the closed state.

[0062] Figure 12 This is a cross-sectional view of the hardware hinge of the present invention with the hinge arm hidden and the hinge in the closed state.

[0063] Figure 13 This is a schematic diagram of the mating structure of the lower connecting arm, the opening drive arm, and the guide pin of the present invention.

[0064] Explanation of reference numerals in the attached figures 1—Hinge cup; 2—Hinged arm; 21—Accommodating cavity; 3—Upper connecting arm; 31—Drive arm closed; 32—Hinge closed; 4—Lower connecting arm; 41—Open drive arm; 42—Guide pin; 5—Buffer; 51—Main body; 52—Piston rod; 6—Modible frame; 61—Connecting part; 62—Linking part; 63—Connecting groove; 64—Pressure boss; 7—Sleeve; 71—Mounting hole; 72—Guide groove; 73—Connecting seat; 74—Positioning platform; 8—First locating pin; 9—Second positioning pin. Detailed Implementation

[0065] The structural composition, assembly relationship, motion process, force transmission path and technical effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0066] It should be noted that this embodiment is used to illustrate the technical principles of the present invention, and not to limit the scope of protection of the present invention. Without departing from the basic concept of the present invention, the specific shape, size, connection method and relative position of each component can be adaptively adjusted according to the actual product structure.

[0067] The term "opening direction" as used in this manual refers to the movement of hinge cup 1 relative to hinge arm 2 in the direction that moves the cabinet door away from the closed position of the cabinet; the term "closing direction" refers to the movement of hinge cup 1 relative to hinge arm 2 in the direction that moves the cabinet door closer to the closed position of the cabinet.

[0068] The term "opening end segment" refers to the final section of the hinge's movement from the middle open position to the maximum open position; the term "closing end segment" refers to the final section of the hinge's movement from the middle closed position to the fully closed position.

[0069] "Compression buffer" refers to the piston rod 52 being pushed back relative to the buffer body 51 by the movable frame 6, so that the buffer 5 generates a damping force in the opposite direction to the movement of the movable frame 6.

[0070] like Figures 1 to 4 As shown, the hardware hinge in this embodiment includes a hinge cup 1, a hinge arm 2, an upper connecting arm 3, and a lower connecting arm 4. The hinge cup 1 is used to be embedded or fixed on the cabinet door, and the hinge arm 2 is used to be fixed to the cabinet body directly or through a mounting base. One end of the upper connecting arm 3 is hinged to the hinge cup 1, and the other end of the upper connecting arm 3 is hinged to the hinge arm 2.

[0071] One end of the lower connecting arm 4 is hinged to the hinge cup 1, and the other end of the lower connecting arm 4 is hinged to the hinge arm 2. The hinge cup 1, hinge arm 2, upper connecting arm 3, and lower connecting arm 4 together constitute a linkage mechanism.

[0072] When the cabinet door opens or closes relative to the cabinet body, the hinge cup 1 moves relative to the hinge arm 2, and the upper connecting arm 3 and the lower connecting arm 4 swing around their respective hinge axes. Due to the different hinge positions and effective lengths of the upper connecting arm 3 and the lower connecting arm 4, they have different motion trajectories during the hinge opening and closing process. This invention utilizes the aforementioned motion characteristics of the upper connecting arm 3 and the lower connecting arm 4 to form a closing drive path and an opening drive path, respectively.

[0073] The hinge arm 2 has a receiving cavity 21, in which the buffer 5, movable frame 6, and sleeve 7 are installed. All these components are located inside the hinge arm 2, which reduces the impact of the buffer mechanism on the external dimensions and appearance of the hinge.

[0074] like Figures 5 to 7As shown, sleeve 7 is installed within the receiving cavity 21 of hinge arm 2, and sleeve 7 has a mounting hole 71. The mounting hole 71 extends along the extension and retraction direction of piston rod 52 of buffer 5. Buffer 5 includes a main body 51 and a piston rod 52 that can extend and retract relative to the main body 51. Buffer body 51 is fixedly installed within mounting hole 71, and piston rod 52 extends outward from one end of mounting hole 71 toward movable frame 6. Buffer body 51 is fixed relative to sleeve 7 and hinge arm 2. When piston rod 52 retracts into the main body 51 under the push of movable frame 6, buffer 5 generates damping force.

[0075] In this embodiment, the buffer 5 is preferably a linear hydraulic buffer with an automatic reset function. When the piston rod 52 is subjected to pressure, it retracts into the main body 51 and generates damping; when the pressure on the piston rod 52 is released, the piston rod 52 extends outward under the action of the reset structure inside the buffer. When the piston rod 52 extends outward, it can push the movable frame 6 to reset in the opposite direction to the compression direction, thereby preparing for the next opening or closing of the buffer.

[0076] The sleeve 7 serves not only to house and secure the buffer 5 but also to provide a sliding guide for the movable frame 6. The buffer 5 and the movable frame 6 form a relatively independent buffer assembly around the sleeve 7, facilitating pre-assembly before the hinge arm 2 is installed. The sleeve 7 is equipped with a connecting seat 73, which is positioned and connected to the hinge arm 2 via a first locating pin 8. The connecting seat 73 restricts significant axial, lateral, or rotational movement of the sleeve 7 relative to the hinge arm 2. A positioning platform 74 is located at the end of the sleeve 7 furthest from the movable frame 6. A second locating pin 9 is fixed to the hinge arm 2, positioned below the positioning platform 74, and forms a supporting and limiting engagement with it.

[0077] When the piston rod 52 is compressed by the movable frame 6, the buffer body 51 experiences a counterforce, which is transmitted to the sleeve 7. The sleeve 7 then transmits the force to the hinge arm 2 through the connecting seat 73, the first positioning pin 8, the positioning platform 74, and the second positioning pin 9. The first positioning pin 8 mainly positions the connecting seat 73 of the sleeve 7, while the second positioning pin 9 mainly supports and limits the positioning platform 74 at the tail of the sleeve 7. The two positioning positions are spaced apart, forming a larger support span. A larger support span helps improve the sleeve 7's ability to resist swaying and rotation, preventing the sleeve 7 from tilting or loosening after repeatedly bearing the buffer's reaction force. If the sleeve 7 shifts position, the axis of the piston rod 52 may not be aligned with the sliding direction of the movable frame 6, thereby increasing the lateral force on the piston rod 52. The multi-point positioning structure of this embodiment can reduce the above risks.

[0078] like Figure 13As shown, the movable frame 6 includes a connecting part 61 and two linkage parts 62 respectively located on both sides of the connecting part 61. The connecting part 61 laterally connects the two linkage parts 62, making the movable frame 6 a single load-bearing component. The connecting part 61 and the two linkage parts 62 together form an inverted U-shaped structure with the opening facing the sleeve 7. The two linkage parts 62 are located on both sides of the sleeve 7, so that the movable frame 6 straddles the outside of the sleeve 7. This arrangement makes full use of the space on both sides of the sleeve 7, without requiring the movable frame 6 to be completely placed above or below the sleeve 7.

[0079] Guide grooves 72 are provided on both the left and right sides of the sleeve 7, and the two guide grooves 72 extend along the extension and retraction direction of the piston rod 52. Two linkage parts 62 are slidably installed in the corresponding guide grooves 72. When the movable frame 6 moves under the drive of the closing hinge 32 or the guide pin 42, the two linkage parts 62 slide synchronously along the two guide grooves 72. Since the two guide grooves 72 are located on both sides of the sleeve 7, and there is a certain distance between the two guide grooves 72, a double-sided constraint can be formed on the movable frame 6. Compared with a single guide structure only set in the middle of the movable frame 6, the double-sided spaced guide can more effectively limit the left and right swing of the movable frame 6 and the torsion around the axis of the piston rod 52.

[0080] When the movable frame 6 is pushed by the closing hinge 32, the driving force mainly acts on the connecting part 61; when the movable frame 6 is pushed by the guide pin 42, the driving force acts on the connecting grooves 63 on the two linkage parts 62 respectively. Although the two driving forces act at different positions, the movable frame 6 is constrained by the two guide grooves 72, so it can move stably in the same direction.

[0081] The connecting part 61 is provided with a pressing boss 64, which corresponds to the end of the piston rod 52, and the end of the piston rod 52 abuts against the pressing boss 64. The pressing boss 64 is preferably located in the transverse middle of the connecting part 61. When the movable frame 6 moves in the compression direction, the force from the closing hinge 32 or the guide pin 42 is collected through the movable frame 6 to the pressing boss 64, and then acts on the piston rod 52 by the pressing boss 64. The pressing boss 64 is located close to the axis of the piston rod 52, which allows the force transmitted from the movable frame 6 to the piston rod 52 to mainly form axial pressure, reducing the transverse component force on the piston rod 52. The abutting relationship between the piston rod 52 and the pressing boss 64 simplifies assembly. During installation, only the end of the piston rod 52 needs to be aligned with the pressing boss 64; no additional pins or threaded fastening structures are required. When the buffer 5 resets, the piston rod 52 extends outward and connects to the pressing boss 64, thereby pushing the movable frame 6 to reset. The abutment structure can therefore simultaneously meet the requirements of compression force transmission and reset force transmission.

[0082] Close the driver structure like Figure 9 , 10As shown in Figure 11, the upper connecting arm 3 is provided with two closing drive arms 31, which are arranged to the left and right of the upper connecting arm 3. A closing hinge pin 32 is connected between the two closing drive arms 31. The closing hinge pin 32 extends laterally, and its two ends are supported by the two closing drive arms 31 respectively. The closing hinge pin 32 can be installed between the two closing drive arms 31 by an independent pin, or it can be integrated with the closing drive arms 31. The two closing drive arms 31 provide double-sided support for the closing hinge pin 32, which can reduce the unilateral deflection of the closing hinge pin 32 after being subjected to the reaction force of the movable frame 6.

[0083] The closing hinge 32 is located within the movement area corresponding to the connecting part 61 of the movable frame 6. As the upper connecting arm 3 swings, the closing hinge 32 moves along a trajectory centered on the corresponding hinge axis. In the open state and intermediate open / closed state of the hinge, the closing hinge 32 is separated from the connecting part 61, or the closing hinge 32 does not apply a force to the connecting part 61 to compress the buffer 5 of the movable frame 6. When the hinge moves in the closing direction and enters the final closing stage, the closing hinge 32 moves to the contact position corresponding to the connecting part 61 and forms a pressing fit with the connecting part 61.

[0084] The upper connecting arm 3 continues to swing in the closing direction, and the two closing drive arms 31 drive the closing hinge shaft 32 to move. The closing hinge shaft 32 presses against the connecting part 61 and pushes the movable frame 6.

[0085] The movable frame 6 moves along the retraction direction of the piston rod 52 under the constraint of the two guide grooves 72, and the pressing boss 64 pushes the piston rod 52 to retract into the buffer body 51. The damping force generated by the buffer 5 acts in the opposite direction on the upper connecting arm 3 through the piston rod 52, the pressing boss 64, the movable frame 6, the connecting part 61, the closing hinge pin 32, and the closing drive arm 31. This reverse force prevents the upper connecting arm 3 from continuing to move rapidly in the closing direction, thereby reducing the movement speed of the hinge cup 1 and the cabinet door in the final closing stage.

[0086] It should be noted that in this invention, the closing hinge 32 and the connecting part 61 adopt a separable pressing fit, and the closing hinge 32 does not need to be permanently connected to the movable frame 6. When the hinge moves from the closed position to the open direction, the closing hinge 32 moves in the opposite direction with the upper connecting arm 3, and gradually releases the pressure on the connecting part 61. After the closing hinge 32 separates from the connecting part 61, the movable frame 6 is no longer restricted from resetting, and the piston rod 52 of the buffer 5 can extend outward and push the movable frame 6 back to the initial position. Therefore, the closing drive structure can automatically engage at the end of the closing stage and automatically disengage after leaving the end of the closing stage, without the need for additional control components or switching components.

[0087] Open the driver structure: such as Figure 6 , 7As shown in Figure 8, the lower connecting arm 4 is provided with two opening drive arms 41, which are arranged to the left and right of the lower connecting arm 4. A guide pin 42 connects the two opening drive arms 41. The guide pin 42 extends laterally, and its axis is preferably parallel to the hinge axis between the lower connecting arm 4 and the hinge arm 2. Each of the two linkage parts 62 is provided with a long strip-shaped connecting groove 63, which corresponds to each other. The two ends of the guide pin 42 extend into the two connecting grooves 63 respectively. The guide pin 42 is supported from both sides by the two opening drive arms 41, and the two ends of the guide pin 42 respectively cooperate with the connecting grooves 63 on the two linkage parts 62. When the guide pin 42 presses against the end wall of the connecting groove 63, the opening driving force can act on both sides of the movable frame 6 simultaneously or substantially simultaneously. Compared with the guide pin 42 acting only on one side of the movable frame 6, the above-mentioned dual-side driving method can reduce the torsional torque caused by uneven force on the movable frame 6. The connecting groove 63 extends along the sliding direction of the movable frame 6, and its length is greater than the diameter of the guide pin 42. Therefore, the guide pin 42 can move relative to each other between the two end walls of the connecting groove 63. The end wall in the connecting groove 63 that bears the force of the guide pin 42 at the end of the opening can be called the opening drive end wall. The other end wall of the connecting groove 63 is used to limit the maximum relative range of movement of the guide pin 42 within the connecting groove 63.

[0088] During the initial and middle stages of hinge opening, guide pin 42 moves with lower connecting arm 4 and relative to connecting groove 63. At this time, guide pin 42 is not pressing against the opening drive end wall, or has not yet applied a force sufficient to push movable frame 6 to compress buffer 5. The relative movement of guide pin 42 within the aforementioned range constitutes a free stroke. This free stroke allows lower connecting arm 4 to rotate within a certain angle range without immediately driving movable frame 6 to compress buffer 5. Without this free stroke, guide pin 42 might push movable frame 6 as soon as the cabinet door begins to open, causing buffer 5 to continuously generate damping throughout the entire opening stroke, resulting in difficulty in opening the cabinet door.

[0089] The idle stroke delays the opening buffer until the cabinet door is close to its maximum opening position, which ensures the smoothness of the cabinet door's middle stroke and allows for targeted control of the maximum opening impact.

[0090] The connecting groove 63 also provides clearance for the movement of the movable frame 6 during the closing buffer process. When the closing hinge 32 pushes the movable frame 6, the movable frame 6 moves relative to the guide pin 42, and the guide pin 42 can generate relative displacement within the connecting groove 63. If the guide pin 42 and the movable frame 6 are fixedly connected without any idle travel, the movable frame 6 may pull the lower connecting arm 4 in the opposite direction when pushed by the closing hinge 32, or it may be restricted by the position of the lower connecting arm 4 and unable to move smoothly. Therefore, the idle travel formed by the connecting groove 63 is not only used to control the trigger time of opening the buffer, but also to release the rigid constraint of the guide pin 42 on the movable frame 6 during the closing buffer process.

[0091] The driving force transmission path of this invention in the closed buffer state is as follows: The upper connecting arm 3 drives the closing drive arm 31 to move, the closing drive arm 31 drives the closing hinge 32 to move, the closing hinge 32 presses against the connecting part 61 of the movable frame 6, the connecting part 61 drives the entire movable frame 6 to move along the guide groove 72, the pressing boss 64 pushes the piston rod 52 to retract, and the buffer 5 generates damping.

[0092] The reaction force generated by the buffer 5 is transmitted along the opposite path, that is, from the buffer body 51 to the sleeve 7 and the hinge arm 2, and from the piston rod 52 through the pressing boss 64, the movable frame 6, the connecting part 61, the closing hinge 32 and the closing drive arm 31 to the upper connecting arm 3.

[0093] The driving force transmission path of this invention in the open buffer state is as follows: The lower connecting arm 4 drives the two opening drive arms 41 to move, and the two opening drive arms 41 drive the guide pin 42 to move. The two ends of the guide pin 42 press against the opening drive end wall of the two connecting grooves 63 respectively. The two linkage parts 62 jointly drive the movable frame 6 to move, and the pressing boss 64 pushes the piston rod 52 to retract, and the buffer 5 generates damping.

[0094] The reaction force generated by the buffer 5 is transmitted from the piston rod 52 through the pressing boss 64, the movable frame 6, the two linkage parts 62, the two connecting grooves 63, the guide pin 42 and the two opening drive arms 41 to the lower connecting arm 4.

[0095] The two drive paths mentioned above originate from the upper connecting arm 3 and the lower connecting arm 4, respectively, but ultimately act on the same piston rod 52 through the same movable frame 6 and the same pressing boss 64. The closed drive path mainly acts on the connecting part 61 of the movable frame 6, while the open drive path mainly acts on the linkage parts 62 on both sides of the movable frame 6. As a single component, the movable frame 6 gathers and converts the driving forces from the two different positions into a linear force along the axial direction of the piston rod 52. The guide grooves 72 on both sides of the sleeve 7 guide the movable frame 6 in both drive states, so the two different drive paths can share the same set of linear guide structures.

[0096] Detailed working principle: like Figure 3 , 4As shown, when the hinge is fully closed and the cabinet door is also fully closed, the hinge cup 1 is in the closed position relative to the hinge arm 2, and the upper connecting arm 3 and the lower connecting arm 4 are in the posture corresponding to the closed position. The closing hinge pin 32 is located in the pressing position corresponding to the connecting part 61. Under the action of the closing hinge pin 32, the movable frame 6 is in the position of compressing the buffer 5, and the piston rod 52 is in a fully retracted or partially retracted state relative to the buffer body 51. The two ends of the guide pin 42 are still located in the two connecting grooves 63, but there is a free stroke between the guide pin 42 and the connecting groove 63 to allow relative movement between the movable frame 6 and the guide pin 42. Since the closing hinge pin 32 and the connecting part 61 are connected by pressing rather than fixing, after the hinge begins to open, the closing hinge pin 32 can gradually move away from the connecting part 61 along its movement trajectory.

[0097] When the cabinet door needs to be opened, the user applies an opening force to the door, causing the hinge cup 1 to move relative to the hinge arm 2 in the opening direction, and the upper connecting arm 3 and the lower connecting arm 4 to begin swinging. The upper connecting arm 3 drives the closing drive arm 31 and the closing hinge shaft 32 to move in opposite directions, and the pressure exerted by the closing hinge shaft 32 on the connecting part 61 gradually decreases. When the closing hinge shaft 32 releases its pressure on the connecting part 61, the movable frame 6 is no longer compressed by the closing drive structure. The piston rod 52 of the buffer 5 extends outward under the action of the internal reset structure, and the piston rod 52 pushes the movable frame 6 to move in the reset direction through the pressing boss 64. When the movable frame 6 resets, the two linkage parts 62 slide along the guide grooves 72 on both sides of the sleeve 7, and the movable frame 6 maintains a motion state that is basically coaxial with the piston rod 52. During this reset process, the guide pin 42 can move relative to the connecting groove 63, so the guide pin 42 will not hinder the reset of the movable frame 6.

[0098] In the initial stage of the cabinet door opening, the upper connecting arm 3 and the lower connecting arm 4 continue to swing. The closing hinge pin 32 has separated from the connecting part 61 and no longer acts on the movable frame 6. The lower connecting arm 4 drives the opening drive arm 41 and the guide pin 42 to move. Since the guide pin 42 is located in the elongated connecting groove 63, the guide pin 42 first undergoes relative displacement along the connecting groove 63. At this time, the guide pin 42 has not yet reached the opening drive end wall of the connecting groove 63, and the movement of the guide pin 42 will not immediately be converted into the compression movement of the movable frame 6. The buffer 5 does not generate damping caused by the guide pin 42 in the initial stage of opening, and the cabinet door can open smoothly.

[0099] After the cabinet door passes through the initial opening stage, it enters the middle opening stage. The guide pin 42 continues to move with the lower connecting arm 4 and continues to move within the empty stroke formed by the connecting groove 63. During this stage, the closing hinge 32 remains separated from the movable frame 6, and the guide pin 42 has not yet reached the opening drive end wall of the connecting groove 63. Therefore, neither the closing drive structure nor the opening drive structure applies compression to the movable frame 6, and the movable frame 6 remains in the reset position or near the reset position. By keeping the buffer 5 in a non-compressed state during the middle opening stage, the buffer 5 can be prevented from continuously consuming the opening force applied by the user during the main movement stroke of the cabinet door. Thus, the present invention can balance the smoothness of the middle opening stage with the buffering effect of the final opening stage.

[0100] As the cabinet door continues to open and approaches its maximum opening angle, the lower connecting arm 4 moves to the corresponding position, and the guide pin 42 reaches the opening drive end wall of the connecting groove 63. The guide pin 42 changes from a relative sliding state within the connecting groove 63 to a force-transmitting state that presses against the end wall of the connecting groove 63. As the lower connecting arm 4 continues to swing in the opening direction, the two opening drive arms 41 jointly drive the guide pin 42, and the two ends of the guide pin 42 apply force to the opening drive end walls of the two connecting grooves 63 respectively. After being acted upon by the guide pin 42, the two linkage parts 62 drive the connecting part 61 and the entire movable frame 6 to move along the guide groove 72 towards the compression buffer 5. When the movable frame 6 moves, the pressing boss 64 pushes the piston rod 52 to retract into the buffer body 51, and the buffer 5 begins to generate opening damping.

[0101] The opening damping, via the movable frame 6, connecting groove 63, guide pin 42, and opening drive arm 41, acts in the opposite direction on the lower connecting arm 4, slowing down the speed at which the lower connecting arm 4 and hinge cup 1 continue to move towards the maximum opening position. The opening damping is not generated after the cabinet door has already struck the mechanical limit component, but rather before the cabinet door reaches the maximum opening position.

[0102] Therefore, some of the kinetic energy of the cabinet door can be absorbed and dissipated by the buffer 5 before reaching the mechanical limit position.

[0103] As the cabinet door continues to move towards its maximum opening position, piston rod 52 retracts further, and buffer 5 continues to provide damping. Under the action of buffer 5, the speed of the cabinet door gradually decreases as it approaches the maximum opening position, and the mechanical limiting component only needs to bear the remaining kinetic energy after buffering. Compared with a structure without buffering, the peak impact at the mechanical limiting position is reduced, and the rebound tendency of the cabinet door after reaching the maximum opening position is also weakened. After the rebound weakens, the amplitude and frequency of the cabinet door's reciprocating swaying near the maximum opening position are reduced, thereby reducing the possibility of the limiting component being subjected to secondary or multiple impacts. The damping generated at the end of the opening can also improve the user's opening feel, allowing the cabinet door to gradually decelerate as it approaches the maximum opening angle, rather than suddenly stopping.

[0104] When the cabinet door moves from its fully open position to the closing position, the lower connecting arm 4 swings in the opposite direction, and the opening drive arm 41 and guide pin 42 move in the opposite direction accordingly. The guide pin 42 gradually releases its pressure on the opening drive end wall of the connecting groove 63, and the opening drive path changes from a force transmission state to a relative sliding state. After the guide pin 42 releases its drive, the piston rod 52 of the buffer 5 extends outward and pushes the movable frame 6 to move in the reset direction through the pressing boss 64. When the movable frame 6 resets, the guide pin 42 generates relative displacement within the connecting groove 63, and the free stroke provided by the connecting groove 63 allows the movable frame 6 to reset smoothly. Therefore, the opening buffer mechanism will not continuously drag the lower connecting arm 4 when the cabinet door begins to close, nor will it hinder the reset of the buffer 5.

[0105] When closing the initial and middle sections: the cabinet door continues to move in the closing direction, the guide pin 42 moves relative to the empty stroke of the connecting groove 63, and no longer pushes the movable frame 6 to compress the buffer 5.

[0106] During the initial and middle closing stages, the closing hinge 32 has not yet moved to the position of contacting the connecting part 61. At this time, the guide pin 42 is in an idle state, the closing hinge 32 is in a disengaged state, and neither drive structure compresses the buffer 5. The cabinet door can move smoothly during the initial and middle closing stages, avoiding continuous resistance from the bidirectional buffer mechanism throughout the entire closing stroke.

[0107] As the cabinet door approaches the fully closed position, the upper connecting arm 3 drives the two closing drive arms 31 and the closing hinge pin 32 to the corresponding pressing position of the connecting part 61. The closing hinge pin 32 first contacts the connecting part 61. As the upper connecting arm 3 continues to swing in the closing direction, the closing hinge pin 32 applies a force to the connecting part 61. The connecting part 61 drives the entire movable frame 6 to move along the guide grooves 72 on both sides of the sleeve 7, and the pressing boss 64 pushes the piston rod 52 to retract. The buffer 5 begins to generate closing damping, and the closing damping acts in the opposite direction on the upper connecting arm 3 via the closing hinge pin 32 and the closing drive arms 31. The movement speed of the upper connecting arm 3, the hinge cup 1, and the cabinet door in the final closing stage is thus reduced, and the cabinet door can approach the cabinet body more smoothly. During the process of the closing hinge pin 32 pushing the movable frame 6, the movable frame 6 is displaced relative to the guide pin 42, and the guide pin 42 can slide in the connecting groove 63. The free travel of the connecting groove 63 prevents the guide pin 42 from rigidly blocking the closing buffer movement of the movable frame 6, thereby avoiding interference between the opening drive structure and the closing drive structure at the end of the closing phase.

[0108] As the cabinet door continues to close, the closing hinge 32 further pushes the movable frame 6, and the piston rod 52 continues to retract, generating damping. The cabinet door eventually reaches the fully closed position at a lower speed, thereby reducing collisions between the door and the cabinet body and closing noise. At this point, the mechanism returns to the fully closed state and is ready to enter the next opening cycle.

[0109] In a complete opening and closing cycle, buffer 5 first resets when the cabinet door leaves the closed position, and then is compressed by guide pin 42 at the end of the opening phase; subsequently, it resets again when the cabinet door leaves the maximum open position, and is compressed by closing hinge 32 at the end of the closing phase. Thus, the same buffer 5 can complete the opening and closing buffering sequentially in one opening and closing cycle.

[0110] The closing drive structure and the opening drive structure of the present invention do not act on the movable frame 6 simultaneously and continuously, but work alternately in different angle ranges.

[0111] At the end of the closing phase, the closing hinge 32 presses against the connecting part 61, and the guide pin 42 has relative movement space within the connecting groove 63.

[0112] At the end of the opening, the guide pin 42 presses against the opening drive end wall of the connecting groove 63, and the closing hinge 32 is separated from the connecting part 61.

[0113] In the open and closed sections, the closing hinge 32 separates from the connecting part 61, and the guide pin 42 is in the free stroke of the connecting groove 63.

[0114] Therefore, the two drive structures have access intervals, release intervals, and avoidance intervals, respectively.

[0115] The closing drive structure achieves engagement and disengagement through a separable pressing relationship, while the opening drive structure achieves delayed engagement, disengagement, and avoidance through a pin slot free stroke. These two different transmission methods adapt to the different motion trajectories of the upper arm 3 and the lower arm 4, respectively, and work together around the same movable frame 6. If both the opening and closing drive structures are fixedly connected, the different motion trajectories of the two arms can easily create contradictory constraints on the movable frame 6.

[0116] This invention employs a combination of a detachable pressure side and a sliding pin groove side, enabling the two drive structures to reliably transmit force between corresponding buffer zones and release constraints between non-corresponding buffer zones. This combination is a crucial structural basis for allowing the same buffer 5 to alternately perform two buffering functions.

[0117] Among them, the movable frame 6 is driven by different parts when the buffer is closed and when the buffer is opened.

[0118] When the buffer is closed, the closing hinge 32 mainly acts on the connecting part 61; when the buffer is opened, the guide pin 42 mainly acts on the two linkage parts 62 through the two connecting grooves 63.

[0119] To avoid inconsistent movement of the movable frame 6 due to different operating positions, parallel guide grooves 72 are provided on both sides of the sleeve 7, and the two linkage parts 62 move along the corresponding guide grooves 72 respectively. The double-sided guidance ensures that the movable frame 6 has a definite sliding direction in both driving states, reducing movement deviation caused by changes in the force position of the movable frame 6.

[0120] The closing hinge 32 is supported by two closing drive arms 31, and the guide pin 42 is supported by two opening drive arms 41, with both ends of the guide pin 42 engaging with two connecting grooves 63 respectively. This structure forms a relatively balanced force distribution, reducing the torque generated by unilateral drive. The pressure boss 64 is positioned near the center of the connecting part 61, concentrating the driving force transmitted through the movable frame 6 onto the end of the piston rod 52. The combined effect of the double-sided guidance of the movable frame 6, the double-sided support of the drive components, and the central force transmission of the pressure boss 64 reduces the possibility of lateral loads on the piston rod 52. The sleeve 7, through the first positioning pin 8 and the second positioning pin 9, forms positioning and support at different positions with the hinge arm 2, and can withstand the reaction force generated by the long-term repeated compression of the buffer 5. The above-mentioned guiding structure, force-bearing structure, and mounting structure work together to improve the bidirectional buffering performance.

[0121] In actual product design, the time it takes for the closing hinge 32 to begin pressing against the connecting part 61 can be changed by adjusting the shape and extension length of the closing drive arm 31 and the position of the closing hinge 32 relative to the upper connecting arm 3. This allows adjustment of the closing buffer's starting angle and effective stroke. The time it takes for the guide pin 42 to reach the opening drive end wall can be changed by adjusting the length of the opening drive arm 41, the position of the guide pin 42 relative to the lower connecting arm 4, the length of the connecting groove 63, and the position of the opening drive end wall.

[0122] Therefore, the opening buffer start angle, idle stroke length, and effective opening buffer stroke can be adjusted. The connecting groove 63 is preferably a straight groove extending along the sliding direction of the movable frame 6 to make the movement relationship between the guide pin 42 and the movable frame 6 clearer. While meeting the idle stroke and opening drive requirements, the connecting groove 63 can also be configured with a locally inclined section or an arc-shaped transition section according to the actual movement trajectory of the guide pin 42. The movable frame 6, sleeve 7, closing drive arm 31, and opening drive arm 41 can be made of metal or engineering materials that meet strength and wear resistance requirements. The closing hinge 32 and guide pin 42 are preferably pin components with high wear resistance and bending strength. The contact surface between the pressing boss 64 and the piston rod 52 can be set as a plane, an arc surface, or a contact surface adapted to the shape of the end of the piston rod 52. The two connecting grooves 63 are preferably arranged correspondingly on the left and right, and the two guide grooves 72 are preferably arranged parallel to each other to ensure synchronous movement on both sides of the movable frame 6.

[0123] Without changing the basic technical concept of the present invention, the sleeve 7 can also be fixed to the hinge arm 2 by other positioning components, but it should be ensured that the buffer body 51 is stably installed relative to the hinge arm 2 and that the movable frame 6 can slide along the extension and retraction direction of the piston rod 52.

[0124] The core technical concept of this invention is that the closing drive structure on the upper connecting arm 3 and the opening drive structure on the lower connecting arm 4 drive the same movable frame 6 at different stages of hinge movement. The movable frame 6 converts the two different linkage movements into linear motion that compresses the same buffer 5. The closing drive structure achieves phased engagement through a separable pressing method, while the opening drive structure achieves delayed engagement and movement avoidance through the free travel between the guide pin 42 and the long strip connecting groove 63.

[0125] Therefore, this invention has a compact structure and can be manufactured using existing hardware processing, stamping, injection molding, pin assembly, and damper assembly processes. This invention can be applied to cabinets, wardrobes, storage cabinets, office furniture, and other products with rotating doors, and allows for the selection of dampers with appropriate damping parameters based on the door's weight, size, and maximum opening angle. This invention achieves both opening and closing stage buffering without adding a second damper, demonstrating good manufacturing feasibility and industrial application value, and thus can be widely promoted and used.

Claims

1. A hardware hinge with a bidirectional opening and closing buffer function, comprising a hinge cup (1), a hinge arm (2), an upper connecting arm (3), and a lower connecting arm (4), wherein the two ends of the upper connecting arm (3) and the lower connecting arm (4) are respectively hinged to the hinge cup (1) and the hinge arm (2), characterized in that: The hinge arm (2) is provided with a buffer (5) and a movable frame (6) that slides along the extension and retraction direction of the piston rod (52) of the buffer (5), and the piston rod (52) abuts against the movable frame (6); The movable frame (6) includes a connecting part (61) and two linkage parts (62) respectively provided on both sides of the connecting part (61). The two linkage parts (62) are respectively provided with elongated connecting grooves (63). The upper connecting arm (3) is provided with two closing drive arms (31) and a closing hinge (32) connected between the two closing drive arms (31). The closing hinge (32) and the connecting part (61) form a separable pressing fit. The lower connecting arm (4) is provided with two opening drive arms (41) and a guide pin (42) connecting the two opening drive arms (41). The two ends of the guide pin (42) are respectively slidably placed in the corresponding connecting groove (63). The closing hinge (32) and the guide pin (42) respectively drive the movable frame (6) to compress the buffer (5) at the closing end and the opening end of the hinge.

2. The hardware hinge with bidirectional opening and closing buffer function according to claim 1, characterized in that: The hinge arm (2) is provided with a receiving cavity (21), and a sleeve (7) is fixedly installed in the receiving cavity (21). The sleeve (7) is provided with a mounting hole (71) extending along the extension and retraction direction of the piston rod (52). The main body (51) of the buffer (5) is fixedly installed in the mounting hole (71).

3. The hardware hinge with bidirectional opening and closing buffer function according to claim 2, characterized in that: The piston rod (52) of the buffer (5) extends from the mounting hole (71) toward one end of the movable frame (6), and the connecting part (61) is provided with a pressing boss (64), and the end of the piston rod (52) abuts against the pressing boss (64).

4. The hardware hinge with bidirectional opening and closing buffer function according to claim 2, characterized in that: The connecting part (61) and the two linkage parts (62) together form an inverted U-shaped structure with the opening facing the sleeve (7), and the two linkage parts (62) are located on both sides of the sleeve (7).

5. The hardware hinge with bidirectional opening and closing buffer function according to claim 4, characterized in that: The sleeve (7) has guide grooves (72) extending along the extension and retraction direction of the piston rod (52) on both sides, and the two linkage parts (62) are slidably installed in the corresponding guide grooves (72).

6. The hardware hinge with bidirectional opening and closing buffer function according to claim 1, characterized in that: The two closing drive arms (31) are arranged symmetrically to the left and right of the upper connecting arm (3), and the closing hinge (32) is laterally connected between the two closing drive arms (31) and located in the movement area of ​​the connecting part (61).

7. The hardware hinge with bidirectional opening and closing buffer function according to claim 1, characterized in that: The two opening drive arms (41) are arranged symmetrically with respect to the lower connecting arm (4). The guide pin (42) is laterally connected between the two opening drive arms (41), and the axis of the guide pin (42) is parallel to the hinge axis of the lower connecting arm (4) and the hinge arm (2).

8. The hardware hinge with bidirectional opening and closing buffer function according to claim 1, characterized in that: The connecting groove (63) extends along the sliding direction of the movable frame (6), and the length of the connecting groove (63) is greater than the diameter of the guide pin (42) so as to form a free stroke between the guide pin (42) and the two end walls of the connecting groove (63).

9. The hardware hinge with bidirectional opening and closing buffer function according to claim 2, characterized in that: The sleeve (7) is provided with a connecting seat (73), and the connecting seat (73) is positioned and connected to the hinge arm (2) through a first positioning pin (8).

10. The hardware hinge with bidirectional opening and closing buffer function according to claim 9, characterized in that: The sleeve (7) is provided with a positioning platform (74) at one end away from the movable frame (6). A second positioning pin (9) is fixed on the hinge arm (2). The second positioning pin (9) is located below the positioning platform (74) and forms a supporting and limiting cooperation with the positioning platform (74).

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