A concealed hinge

Abstract

This invention relates to the field of hardware hinge technology, specifically a concealed hinge, comprising a fixed base and a movable base: the fixed base has a horizontally extending fixed groove, within which a fixed slider is slidably mounted; the movable base has a horizontally extending movable groove, within which a movable slider is slidably mounted; a main hinge arm is hinged to the fixed base, with its other end hinged to the movable slider; a secondary hinge arm is hinged to the movable base, with its other end hinged to the fixed slider; the main hinge arm and the secondary hinge arm are hinged at their midpoints by a movable pin; a reset mechanism is provided between the fixed slider and the fixed base, which cooperates with the fixed slider during hinge closure to cause the fixed slider to move along the fixed groove in the direction that closes the hinge, thereby achieving self-resetting closure of the hinge.

Description

Technical Field

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

[0002] Concealed cabinet door hinges are widely used in furniture cabinets, cupboards, and display cabinets. They typically conceal the hinge body between the cabinet door and the cabinet side panel. Through a multi-link structure, they achieve a combination of rotation and displacement during the opening and closing of the cabinet door, thus achieving a better concealment effect in appearance and meeting certain opening and closing angle and installation space requirements.

[0003] Existing concealed cabinet door hinges typically consist of a fixed base and a movable base, which are respectively installed on the cabinet body and the cabinet door. They are hinged together by linkage mechanisms such as the main hinge arm and the secondary hinge arm to achieve the rotation of the cabinet door. To accommodate the movement trajectory during the opening process, some concealed hinges also adopt a sliding groove and slider structure, allowing the linkage to move along the sliding groove during the opening and closing process, thereby achieving a more compact structural arrangement or a larger opening angle.

[0004] However, existing concealed cabinet door hinges still generally have the following shortcomings:

[0005] 1. Many existing concealed cabinet door hinges can only achieve basic opening and closing movements. The closing process mainly relies on the user continuously pushing the door until it is fully closed. When the door is nearing the closed position, the torque of the hinge mechanism is often insufficient to drive the door to complete the final closure, easily resulting in a "half-open" or "partially ajar" state, affecting the reliability and consistency of the door's closure. This is especially true when the cabinet door is heavy, there are installation deviations, or the door seal / magnetic fasteners create resistance, making it more prone to incomplete closure, leading to gaps, abnormal noises, or uneven appearance.

[0006] 2. Concealed hinge structures typically contain multiple hinge points and sliding pairs. Over time, this can lead to increased friction, reduced lubrication, or component wear. Additionally, on-site furniture assembly inevitably results in positional deviations. These factors increase the resistance to movement of the cabinet door as it approaches the closed position. Existing hinges lack an effective end-reset drive structure, leading to unstable closing processes and sometimes requiring repeated adjustments or pushing to close the door completely.

[0007] 3. To improve the closing feel, some solutions employ independent damping components or buffer devices. However, in the absence of a "reset drive," simple damping and buffering often only slows down the process and cannot solve the fundamental problem of "incomplete closure." Furthermore, when the user pushes the door forcefully to ensure closure, it may increase the impact and noise at the closing end, and even cause stress on the fixed base, linkage mechanism, or cabinet door connection points, affecting hinge lifespan and structural stability. Therefore, further improvements are necessary. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a self-resetting concealed cabinet door hinge that has a more compact structure, can provide reliable reset drive during cabinet door closing, and can be combined with buffer damping to improve the closing feel.

[0009] The objective of this invention is achieved through the following means: a concealed hinge, comprising a fixed base and a movable base, wherein a fixed groove is provided extending laterally on the fixed base, and a fixed slider is slidably installed in the fixed groove;

[0010] The movable base is provided with a movable groove extending laterally, and a movable slider is slidably installed in the movable groove.

[0011] A main hinge arm is hinged to the fixed base, and the other end of the main hinge arm is hinged to the movable slider.

[0012] A secondary hinge arm is hinged to the movable base, and the other end of the secondary hinge arm is hinged to the fixed slider.

[0013] The main hinge arm and the secondary hinge arm are hinged at the middle by a movable pin.

[0014] A reset mechanism is provided between the fixed slider and the fixed base. The reset mechanism includes a guide plane provided on the fixed slider and a concave drive groove provided on the guide plane. It also includes an elastic drive member provided on the fixed base. The movable end of the elastic drive member elastically abuts against the guide plane and can slide. When the hinge is closed to a predetermined position, it enters the drive groove to cause the fixed slider to move along the fixed slide groove in the direction that closes the hinge, thereby realizing the self-reset closing of the hinge.

[0015] Furthermore, the elastic drive component includes a drive arm hinged to a fixed base, and a first spring disposed between the drive arm and the fixed base. The first spring pushes the drive arm to swing, and the free end of the drive arm constitutes the movable end.

[0016] Furthermore: the drive arm is hinged to the fixed base by a positioning pin, and the first spring is a torsion spring. The torsion spring applies a preload to the drive arm, causing the free end of the drive arm to swing toward the guide plane and maintain elastic contact with the guide plane.

[0017] Furthermore: a mounting base is installed on the fixed base, the drive arm is hinged in the mounting base by a positioning pin, and the first spring is installed in the mounting base.

[0018] Furthermore, the drive arm is provided with an arc-shaped boss, and the first spring abuts against the arc-shaped boss.

[0019] Furthermore, a buffer damper is provided between the fixed slider and the fixed base.

[0020] Furthermore: the end face of the fixed slider is provided with a mounting hole, and the buffer damper is installed in the mounting hole; the fixed base is provided with a mounting seat, and the mounting seat is integrally formed with a baffle portion that abuts against the buffer damper, so as to generate a damping effect on the buffer damper when the hinge is closed.

[0021] Furthermore: the elastic driving component is a second torsion spring mounted on a fixed base, the fixed support leg of the second torsion spring abuts against the fixed base, and the movable support leg of the second torsion spring constitutes the movable end.

[0022] Furthermore, the main hinge arm is provided with a clearance groove in the middle, and the middle part of the secondary hinge arm is hinged in the clearance groove by a movable pin.

[0023] Furthermore, the movable slider includes rollers respectively installed at the upper and lower ends of the main hinge arm, and the rollers roll or slide within the movable groove.

[0024] The beneficial effects of this invention are: 1. Simple structure, low production cost, and improved market competitiveness.

[0025] 2. This application provides a reset mechanism between the fixed slider and the fixed base. During the hinge closing process, the reset mechanism cooperates with the fixed slider to cause the fixed slider to move along the fixed groove in the direction that closes the hinge. Thus, when the cabinet door is closed to the predetermined position, a stable reset driving torque / thrust is automatically established, which drives the linkage mechanism to continue moving, so that the cabinet door closes in the final stage. This avoids the common problems of "half-closing" and "incomplete closure" in the prior art and improves the reliability and consistency of closure.

[0026] 3. Through the cooperation between the guide plane and its concave drive groove and the drive end, a clear trigger condition is formed when the hinge is closed to the set angle, so that the reset force intervenes at the appropriate stage and continues to act on the movement process of the fixed slider, reducing the instability of closing caused by friction, assembly error or door weight difference, making the closing process smoother and the feel more consistent.

[0027] 4. This application provides a buffer damper between the fixed slider and the fixed base. The buffer damper is installed in the mounting hole on the end face of the fixed slider and abuts against the baffle part integrally formed with the mounting seat on the fixed base. When the cabinet door is close to the closing end, it generates a damping buffer effect, which can effectively reduce closing impact and collision noise, improve closing comfort, and reduce the impact load on the hinge point, sliding pair and mounting part, thereby improving the durability of the hinge and cabinet connection structure. Attached Figure Description

[0028] Figure 1This is a diagram illustrating the effect of assembling the invention with the cabinet door.

[0029] Figure 2 This is a schematic diagram of the structure of the present invention in the closed state.

[0030] Figure 3 This is a schematic diagram of the structure of the present invention in a half-off state.

[0031] Figure 4 This is one of the schematic diagrams of the structure of the present invention in the fully open state.

[0032] Figure 5 This is the second schematic diagram of the structure of the present invention in its fully open state.

[0033] Figure 6 This is one of the effect diagrams of the free end of the drive arm entering the drive slot in this invention.

[0034] Figure 7 This is one of the exploded structural diagrams of the present invention.

[0035] Figure 8 This is the second exploded view of the structure of the present invention.

[0036] Figure 9 This is the third exploded view of the structure of the present invention.

[0037] Figure 10 This is the second illustration showing the effect of the free end of the drive arm entering the drive slot in this invention.

[0038] Explanation of reference numerals in the attached drawings: 1. Fixed base; 10. Cabinet side panel; 11. Fixed slide rail; 2. Movable base; 21. Movable slide rail; 22. Cabinet door; 3. Fixed slider; 31. Guide plane; 32. Drive groove; 33. Second torsion spring; 34. Fixed support foot; 35. Movable support foot; 37. Damper; 38. Mounting hole; 4. Movable slider; 5. Main hinge arm; 51. Clearance groove; 6. Secondary hinge arm; 7. Movable pin; 8. Drive arm; 81. Positioning pin; 82. Mounting base; 83. Arc boss; 9. First spring. Detailed Implementation

[0039] The invention will now be further described in detail with reference to the accompanying drawings. A concealed hinge includes a fixed base 1 and a movable base 2:

[0040] A fixing groove 11 extends laterally on the fixed base 1, and a fixing slider 3 is slidably installed in the fixing groove 11.

[0041] The movable base 2 is provided with a horizontally extending movable groove 21, and a movable slider 4 is slidably installed in the movable groove 21.

[0042] A main hinge arm 5 is hinged to the fixed base 1, and the other end of the main hinge arm 5 is hinged to the movable slider 4.

[0043] A secondary hinge arm 6 is hinged to the movable base 2, and the other end of the secondary hinge arm 6 is hinged to the fixed slider 3.

[0044] The main hinge arm 5 and the secondary hinge arm 6 are hinged at the middle by a movable pin 7.

[0045] A reset mechanism is provided between the fixed slider 3 and the fixed base 1. The reset mechanism cooperates with the fixed slider 3 during the hinge closing process, causing the fixed slider 3 to move along the fixed slide groove 11 in the direction that closes the hinge, so as to realize the self-resetting closing of the hinge.

[0046] In this embodiment: after the hinge is installed, the fixed base 1 is fixed to the cabinet side panel 10, and the movable base 2 is fixed to the cabinet door 22. When the door is opened, the main hinge arm 5 and the secondary hinge arm 6 move in a four-bar / multi-bar linkage mechanism formed by the movable pin 7, causing the cabinet door to open around the hinge spatial trajectory; at the same time, the movable slider 4 moves in the movable slide groove 21 and the fixed slider 3 moves in the fixed slide groove 11 to match the movement trajectory of the door, ensuring a compact structure and concealed effect.

[0047] When the door is closed, the linkage mechanism moves in the opposite direction. The fixed slider 3 and the reset mechanism cooperate in the later stage of the near-closed position. The reset mechanism applies a push / pull force to the fixed slider 3 in the "closing direction", causing the fixed slider to continue moving along the fixed slide groove 11. This drives the secondary hinge arm 6, the main hinge arm 5 and the movable slider 4 to complete the closing of the later stage, and finally achieves automatic reset and closure.

[0048] Compared with traditional technology, in this structure, the reset force is not involved throughout the entire process, but is generated by the reset mechanism and the fixed slider in the later stage of the closing process, which can significantly reduce "false closing / incomplete closing" and improve the reliability of closure.

[0049] Meanwhile, the sliding block guide makes the movement trajectory controllable, enabling stable reset within the hidden space and adapting to different door weights and friction conditions.

[0050] In one embodiment: the reset mechanism is a guide plane 31 provided on the fixed slider 3, and the guide plane 31 is provided with a concave drive groove 32;

[0051] It also includes an elastic drive member disposed on the fixed base 1. The movable end of the elastic drive member elastically abuts against the guide plane 31 and can slide. When the hinge is closed to the predetermined position, it enters the drive groove 32 to cause the fixed slider 3 to move along the fixed groove 11 in the direction that closes the hinge, thereby realizing the self-resetting closure of the hinge.

[0052] Among them, the elastic driving component is a driving arm 8 hinged to the fixed base 1. A first spring 9 is provided between the driving arm 8 and the fixed base 1. The first spring 9 pushes the driving arm 8 to swing. The free end of the driving arm 8 elastically abuts against the guide plane 31 and can slide. When the hinge is closed to the predetermined position, it enters the driving groove 32.

[0053] In this embodiment: the fixed slider 3 moves within the fixed slide groove 11 during the closing process, and the guide plane 31 provided thereon is equivalent to a "cam guide surface".

[0054] Under the action of the first spring 9, the free end of the drive arm 8 is always pressed against the guide plane 31 and slides on the guide plane.

[0055] When the hinge is closed to a predetermined position / set angle, such as 30°, the free end of the drive arm is guided into the drive groove 32. At this time, the drive arm exerts a force on the drive groove wall under the action of the spring force, forming a component force in the closing direction, which pushes the fixed slider 3 to continue sliding in the closing direction, thereby realizing the establishment and output of the "automatic door closing reset force".

[0056] In one embodiment: the drive arm 8 is hinged to the fixed base 1 by a positioning pin 81, and the first spring 9 is a torsion spring. The torsion spring applies a preload to the drive arm 8, causing the free end of the drive arm 8 to swing toward the guide plane 31 and maintain elastic contact with the guide plane 31.

[0057] In this embodiment: the drive arm 8 forms a rotational hinge point through the positioning pin 81, allowing the drive arm to swing around the positioning pin. The first spring 9 is a torsion spring, which applies a continuous preload to the drive arm to ensure that the free end of the drive arm is always pressed against the guide plane 31, thereby achieving stable following and guidance.

[0058] During the closing process, the free end of the drive arm slides along the guide plane and enters the drive groove at the appropriate time; the preload provided by the torsion spring becomes the subsequent reset force.

[0059] In one embodiment: a mounting base 82 is mounted on the fixed base 1, the drive arm 8 is hinged in the mounting base 82 by a positioning pin 81, and the first spring 9 is mounted in the mounting base 82.

[0060] In this embodiment, the mounting base 82 provides a positioning, accommodating, and mounting reference for the drive arm 8 and the torsion spring. The drive arm and torsion spring are located inside the mounting base, reducing exposure, minimizing interference risks, and facilitating a compact arrangement of the concealed hinge. Simultaneously, the structure within the mounting base limits the swing range of the drive arm, ensuring a more stable entry angle of the free end to the guide plane / drive groove.

[0061] In one embodiment: the drive arm 8 is provided with an arc-shaped boss 83, and the first spring 9 abuts against the arc-shaped boss 83.

[0062] In this embodiment, the arc-shaped boss 83 provides a contact / support position for the torsion spring, making the lever arm and line of action of the torsion spring more stable. Simultaneously, during the swinging of the drive arm, the arc-shaped boss allows for smoother contact of the spring under force, reducing localized stress concentration and wear. This results in a more stable clamping force between the free end of the drive arm and the guide plane, improving the consistency of the subsequent reset force output.

[0063] In one embodiment, a buffer damper 37 is provided between the fixed slider 3 and the fixed base 1.

[0064] In this embodiment, the buffer damper 37 is arranged between the fixed slider and the fixed base, so that it participates in energy absorption when the speed is high in the later stage of closing or when it is about to close. When the fixed slider continues to move in the closing direction under the action of the reset mechanism, the damper generates a damping force to suppress the impact at the closing end, thereby realizing "buffered closing".

[0065] While ensuring automatic reset and closure, it reduces closing impact and noise, significantly improving the user experience.

[0066] Reduce impact loads at hinge points and mounting areas to improve hinge lifespan.

[0067] In one embodiment: the end face of the fixed slider 3 is provided with a mounting hole 38, and the buffer damper 37 is installed in the mounting hole 38; the fixed base 1 is provided with a mounting seat 82, and the mounting seat 82 is integrally formed into a baffle portion that abuts against the buffer damper 37, so as to generate a damping effect on the buffer damper 37 when the hinge is closed.

[0068] In this embodiment, the damper 37 is installed in the mounting hole 38 on the end face of the fixed slider and moves together with the fixed slider, resulting in a compact and reliable installation. The mounting seat 82 on the fixed base is integrally formed into a baffle, which abuts against the end of the damper in the closing section. When the fixed slider is pushed by the reset mechanism to continue moving in the closing direction, the damper is pressed against the baffle, generating a damping stroke and achieving end-of-line buffering.

[0069] The damper's "moving with the slider and pressed down by the baffle" layout features natural triggering, a compact structure, and suitability for concealed hinge spaces. The baffle is integrated with the mounting base, resulting in fewer parts, simpler assembly, and higher reliability.

[0070] In one embodiment: the elastic drive element is a second torsion spring 33 mounted on a fixed base 1, the fixed support foot 34 of the second torsion spring 33 abuts against the fixed base 1, and the movable support foot 35 of the second torsion spring 33 constitutes the movable end.

[0071] Unlike the first embodiment, this embodiment does not use a drive arm, but instead uses the movable support foot 35 of the second torsion spring 33 as the "drive end".

[0072] During the closing process, the movable support foot 35 presses against the guide plane 31 and slides along it under the force of the torsion spring. When the door is closed to the predetermined position, the movable support foot enters the drive groove 32, and the torsion spring force acts on the groove wall through the support foot, forming a component force that pushes the fixed slider to move in the closing direction, thereby outputting an automatic reset closing force. The fixed support foot 34 abuts against the fixed base, providing a reaction force for the torsion spring and a stable mounting reference.

[0073] In this embodiment, the drive arm component is eliminated, resulting in a simpler structure, fewer parts, and fewer potential points of failure. Simultaneously, the support feet act directly on the guide plane / drive groove, leading to a shorter force transmission path, more direct response, and suitability for compact space layouts.

[0074] In one embodiment: the main hinge arm 5 is provided with a clearance groove 51 in the middle, and the middle part of the secondary hinge arm 6 is hinged in the clearance groove 51 by a movable pin 7.

[0075] In this embodiment, the clearance slot 51 provides movement space for the middle part of the secondary hinge arm, ensuring that the main hinge arm and the secondary hinge arm do not interfere with each other during opening and closing. The secondary hinge arm is located within the clearance slot and is hinged to the main hinge arm via a movable pin, allowing the linkage mechanism to complete a large range of swings within the concealed space, improving the smoothness and concealment of opening and closing. Simultaneously, the more compact structure facilitates concealed arrangement and large-angle opening.

[0076] In one embodiment, the movable slider 4 includes rollers mounted at both ends of the main hinge arm 5, which roll or slide within the movable groove 21. The movable slider uses rollers at both ends, which roll / slide within the movable groove, replacing the pure sliding friction of a traditional block slider. During the opening / closing process, the rollers move along the groove with the end of the main hinge arm, reducing frictional resistance and the probability of jamming, making the door movement smoother. Simultaneously, when the reset mechanism outputs the final reset force, the rollers reduce resistance, facilitating a more effective conversion of the reset force into a closing action.

[0077] A detailed and complete explanation of the overall working principle is as follows:

[0078] I. Initial Installation:

[0079] This self-resetting concealed cabinet door hinge consists of a fixed base 1 and a movable base 2 forming the installation base: the fixed base 1 is fixed to the side panel of the cabinet, and the movable base 2 is fixed to the cabinet door. The fixed base 1 is provided with a fixed slide groove 11, and the fixed slider 3 slides laterally along the fixed slide groove 11; the movable base 2 is provided with a movable slide groove 21, and the movable slider 4 slides laterally along the movable slide groove 21.

[0080] One end of the main hinge arm 5 is hinged to the fixed base 1, and the other end is hinged to the movable slider 4; one end of the secondary hinge arm 6 is hinged to the movable base 2, and the other end is hinged to the fixed slider 3; the main hinge arm 5 and the secondary hinge arm 6 are hinged at the middle by a movable pin 7. The above-mentioned sliding pair groove / slider and hinge pair pin together constitute the composite motion mechanism of the concealed hinge, so that the cabinet door not only rotates when opening and closing, but also undergoes a certain amount of translation / swing, in order to meet the spatial trajectory requirements of concealed installation.

[0081] The fixed slider 3 is provided with a guide plane 31 and a concave drive groove 32, which cooperate with the reset mechanism to form the basis for triggering and force transmission of "generating an automatic reset closing force in the closing stage".

[0082] II. How the door opens.

[0083] When the cabinet door rotates from the closed state to the open direction, the movable base 2 moves with the door body, causing the secondary hinge arm 6 to rotate around its hinge point at the movable base 2; at the same time, the secondary hinge arm 6 converts part of the motion into the sliding of the fixed slider 3 along the fixed slide groove 11 through the hinge of its other end to the fixed slider 3.

[0084] Meanwhile, one end of the main hinge arm 5 is hinged to the fixed base, and the other end is hinged to the movable slider 4. During the opening of the door, the main hinge arm 5 swings around the hinge point on the side of the fixed base and drives the movable slider 4 to slide along the movable slide groove 21.

[0085] The main hinge arm 5 and the secondary hinge arm 6 are mutually constrained at the movable pin 7, forming a linkage that ensures the cabinet door moves along a predetermined trajectory when opened, avoiding interference with the cabinet edges and achieving a concealed appearance. The clearance groove 51 provides movement space for the middle part of the secondary hinge arm 6, preventing structural interference when the two hinge arms swing at large angles, thereby reducing friction, scratches, and noise, and improving the smoothness and reliability of opening and closing.

[0086] During the opening process, the reset mechanism is in a follow-up ready-to-trigger state: the drive end maintains elastic contact with the guide plane 31 and slides and follows under the action of the elastic element pre-tightening force, but will not generate a driving force output that will automatically close the cabinet door during the opening phase; wherein, the drive end in the first embodiment is the free end of the drive arm, and the drive end in the second embodiment is the second torsion spring movable support foot.

[0087] III. Door closing principle:

[0088] 1. Closing the front section: When the cabinet door rotates from the open state to the closed state, the main hinge arm 5 and the auxiliary hinge arm 6 move in opposite directions under the constraint of the movable pin 7, and the fixed slider 3 and the movable slider 4 slide back along their respective tracks. This stage is mainly about the return of movement and the convergence of the trajectory. The cabinet door still needs a certain amount of external force to push it to overcome factors such as friction, sealing strip resistance, or insufficient door inertia.

[0089] In the initial closing phase, the drive end of the reset mechanism continuously presses against and slides along the guide plane 31 under the preload of the elastic element. The guide plane 31 here is equivalent to a "cam surface / guide slope," ensuring that the drive end always remains in contact and does not lose contact due to assembly errors or wear gaps, thus guaranteeing the reliability of subsequent triggering.

[0090] 2. Close to the set angle and predetermined position: As the door continues to close, the fixed slider 3 moves with the linkage mechanism to a specific position; at this time, the relative position of the drive groove 32 on the guide plane 31 and the drive end is aligned, and the drive end automatically enters the drive groove 32 under the push of the elastic preload.

[0091] 3. Reset section after triggering: After the drive end enters the drive groove 32, the force generated by the elastic element acts on the wall of the drive groove through the drive end. Due to the geometric orientation of the drive groove 32 relative to the fixed slider 3, the force exerted by the drive end on the groove wall will be decomposed into a component force along the direction of the fixed slide groove 11. This component force points in the direction of "closing the hinge", thereby pushing the fixed slider 3 to continue sliding in the closing direction along the fixed slide groove 11.

[0092] The force sliding of the fixed slider 3 will be transmitted to the movable base 2 and the door body through the secondary hinge arm 6. At the same time, the main hinge arm 5 and the movable slider 4 return synchronously under the linkage constraint of the movable pin 7, and finally the "linear reset thrust of the fixed slider" is transformed into the "end closing torque / pulling force" of the cabinet door, pushing the cabinet door to close the rear section.

[0093] Therefore, after being triggered, even if the user no longer applies force, the hinge can automatically close and reset by relying on the reset force output by the reset mechanism, significantly reducing the probability of "half-closed or not fully closed".

[0094] 4. Closed end buffer section: The buffer damper 37, which includes a buffer structure, is installed in the mounting hole 38 on the end face of the fixed slider 3 and abuts against the baffle portion integrally formed with the mounting seat 82 on the fixed base 1.

[0095] When the reset mechanism pushes the fixed slider 3 into the closed end, the damper 37 begins to press against the baffle, and the damper generates a damping stroke to absorb the remaining kinetic energy of the fixed slider and the door body, thereby reducing the end speed of the fixed slider 3. This achieves buffering at the rear end of the door, reduces closing impact, reduces noise, and reduces the impact load on the hinge point, sliding pair and installation part, improving user comfort and structural life.

[0096] Among them, the movable slider 4 adopts a roller structure. During the stage of closing driven by the reset force, the roller rolls / slides in the movable groove 21, which can further reduce the resistance and make the reset force more effectively converted into the door closing action, thereby improving the reliability and consistency of automatic closing.

[0097] IV. Differentiated working principles of the two elastic drive component embodiments.

[0098] First embodiment:

[0099] like Figure 2-10 As shown, the first spring 9 is a torsion spring, which applies a preload to the drive arm 8, causing the drive arm 8 to swing continuously around the positioning pin 81. Its free end is always pressed against the guide plane 31 of the fixed slider 3, and slides along the guide plane with the movement of the fixed slider during the closing process.

[0100] When closed to the predetermined position, the drive groove 32 is aligned with the free end of the drive arm, and the free end enters the drive groove under the preload of the torsion spring.

[0101] The free end of the drive arm applies force to the wall of the drive groove. The torsion spring force forms a thrust component along the closing direction through the drive arm, which pushes the fixed slider to continue closing along the fixed groove, thereby driving the entire linkage mechanism to close the second stage.

[0102] Compared with traditional technology, the mounting base 82 is used to accommodate the drive arm and torsion spring and provide a mounting reference, which can limit the swing angle and stabilize the contact; the arc boss 83 provides a smoother contact surface for the spring, reducing stress concentration and wear, making the reset output more stable and the service life longer.

[0103] Second embodiment:

[0104] like Figure 10 As shown, the fixed support foot 34 of the second torsion spring 33 abuts against the fixed base 1 to form a reaction force reference, and the movable support foot 35 presses against the guide plane 31 and slides along under the action of the torsion spring force.

[0105] When closed to the predetermined position, the movable support foot 35 directly enters the drive slot 32.

[0106] The movable support foot applies force to the drive groove wall, and the torsion spring force is directly converted into a component force that pushes the fixed slider to move in the closing direction through the support foot, thereby driving the linkage mechanism to complete the automatic closing.

[0107] This embodiment eliminates the drive arm component, resulting in a shorter force transmission path, fewer parts, and a more compact structure. It is suitable for concealed hinge designs that have higher requirements for space and simplified assembly. At the same time, the triggering is also achieved by "entering the drive slot", and the reset effect after closing is clear.

[0108] In summary: Based on the above working process, this application establishes a reset force output through structural triggering at the "set angle / predetermined position" when the door is closed. This reliably pushes the fixed slider to move along the closing direction and converts the linear thrust into the door closing torque through the linkage mechanism, thereby achieving automatic reset closing. At the same time, at the closing end, the buffer damper and the baffle part work together to absorb energy and reduce impact, achieving a composite effect of "automatic reset closing + rear buffer noise reduction", which significantly improves the closing accuracy, user feel and durability.

[0109] 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 concealed hinge, characterized in that: It includes a fixed base (1) and a movable base (2). A fixed groove (11) is provided on the fixed base (1) extending laterally, and a fixed slider (3) is slidably installed in the fixed groove (11). The movable base (2) is provided with a movable slide groove (21) extending laterally, and a movable slider (4) is slidably installed in the movable slide groove (21). A main hinge arm (5) is hinged to the fixed base (1), and the other end of the main hinge arm (5) is hinged to the movable slider (4). A secondary hinge arm (6) is hinged to the movable base (2), and the other end of the secondary hinge arm (6) is hinged to the fixed slider (3); The main hinge arm (5) and the secondary hinge arm (6) are hinged at the middle by a movable pin (7); A reset mechanism is provided between the fixed slider (3) and the fixed base (1). The reset mechanism includes a guide plane (31) provided on the fixed slider (3) and an indented drive groove (32) provided on the guide plane (31). It also includes an elastic drive member provided on the fixed base (1). The movable end of the elastic drive member elastically abuts against the guide plane (31) and can slide. When the hinge is closed to a predetermined position, it enters the drive groove (32) to cause the fixed slider (3) to move along the fixed slide groove (11) in the direction that closes the hinge, thereby realizing the self-reset closing of the hinge.

2. The concealed hinge according to claim 1, characterized in that: The elastic drive component includes a drive arm (8) hinged to a fixed base (1) and a first spring (9) disposed between the drive arm (8) and the fixed base (1). The first spring (9) pushes the drive arm (8) to swing, and the free end of the drive arm (8) constitutes the movable end.

3. A concealed hinge according to claim 2, characterized in that: The drive arm (8) is hinged to the fixed base (1) by a positioning pin (81). The first spring (9) is a torsion spring. The torsion spring applies a preload to the drive arm (8), causing the free end of the drive arm (8) to swing toward the guide plane (31) and maintain elastic contact with the guide plane (31).

4. A concealed hinge according to claim 3, characterized in that: The fixed base (1) is equipped with a mounting seat (82), the drive arm (8) is hinged in the mounting seat (82) by a positioning pin (81), and the first spring (9) is installed in the mounting seat (82).

5. A concealed hinge according to claim 4, characterized in that: The drive arm (8) is provided with an arc-shaped boss (83), and the first spring (9) abuts against the arc-shaped boss (83).

6. A concealed hinge according to claim 1, characterized in that: A buffer damper (37) is provided between the fixed slider (3) and the fixed base (1).

7. A concealed hinge according to claim 6, characterized in that: The end face of the fixed slider (3) is provided with a mounting hole (38), and the buffer damper (37) is installed in the mounting hole (38); the fixed base (1) is provided with a mounting seat (82), and the mounting seat (82) is integrally formed with a baffle portion that abuts against the buffer damper (37) so as to generate a damping effect on the buffer damper (37) when the hinge is closed.

8. A concealed hinge according to claim 1, characterized in that: The elastic drive component is a second torsion spring (33) mounted on a fixed base (1). The fixed support foot (34) of the second torsion spring (33) abuts against the fixed base (1), and the movable support foot (35) of the second torsion spring (33) constitutes the movable end.

9. A concealed hinge according to claim 1, characterized in that: The main hinge arm (5) is provided with a clearance groove (51) in the middle, and the middle part of the secondary hinge arm (6) is hinged in the clearance groove (51) by a movable pin (7).

10. A concealed hinge according to claim 1, characterized in that: The movable slider (4) includes rollers installed at the upper and lower ends of the main hinge arm (5), and the rollers roll or slide within the movable groove (21).

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