Multi-articulated self-closing hinge

Abstract

The application discloses a multi-articulation self-closing hinge, and belongs to the hinge field. When the multi-articulation self-closing hinge is in a fully open state, an elastic assembly is locked with a second connecting piece and is in a compressed state. When the multi-articulation self-closing hinge is in a first critical state, the elastic assembly is unlocked with the second connecting piece, the elastic assembly restores deformation and abuts against a door body fixing base and rotates around the door body fixing base, and the elastic assembly drives the multi-articulation self-closing hinge to move towards a closed state. Therefore, when the door body is in the fully open state, the elastic assembly does not exert a closing force on the door body, so that users can conveniently take and place things. When the door body rotates beyond the first critical state, the elastic assembly exerts a closing force on the door body, so that the door body and a cabinet body are finally fully closed.

Description

Technical Field

[0001] This invention relates to hinges, and more particularly to multi-joint self-closing hinges. Background Technology

[0002] To ensure thermal insulation, refrigerators typically have thicker doors. This requires the hinges connecting the door and the refrigerator cabinet to have a larger opening to avoid interference between the door and the cabinet during opening / closing. Especially with the increasing popularity of built-in refrigerators, the refrigerator door also needs to be assembled onto the cabinet door panel, which further increases the thickness of the entire door and necessitates an even larger opening for the hinges.

[0003] Chinese invention patent CN101111655B discloses a multi-joint hinge, in which a first fixing element is fixed to the furniture and a second fixing element is fixed to the door. The two fixing elements are connected to each other by multiple levers. The scissor-like hinges of the levers can meet the requirements of large opening and open thick doors. However, in order to pre-tighten the multi-joint hinge to the closed position, a spring is set. The spring is always in a tensile state during the closing process. This causes the door to close uncontrollably and quickly under the action of the hinge, thus creating a safety hazard.

[0004] Chinese invention patent CN112292500B discloses a speed-reducing hinge for furniture. It uses a speed-reducing device to reduce the speed when the door closes. However, when the door is fully open, it is subject to the spring force and tends to close. It cannot remain open without the application of external force, which would make it convenient for users to take things out. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a multi-joint self-closing hinge that can remain open when fully open, making it convenient for users to take and put things in; and can be pre-tightened to the closed position when closed, preventing the door and cabinet from not being able to close completely.

[0006] One of the objectives of this invention is achieved through the following technical solution:

[0007] A multi-joint self-closing hinge includes a cabinet mounting base, a door mounting base, a first connector, a second connector, a third connector, a fourth connector, and an elastic component.

[0008] The two ends of the first connector are rotatably connected to the cabinet fixing base and the second connector, respectively. The two ends of the second connector are rotatably connected to the first connector and the door fixing base, respectively. The two ends of the third connector are rotatably connected to the cabinet fixing base and the fourth connector, respectively. The two ends of the fourth connector are rotatably connected to the first connector and the door fixing base, respectively. The elastic component is rotatably installed on the second connector.

[0009] When the multi-joint self-closing hinge is in the fully open state, the elastic component is locked to the second connector and the elastic component is in the compressed state;

[0010] When the multi-joint self-closing hinge is in the first critical state, the elastic component unlocks from the second connector, the elastic component recovers its deformation and abuts against the door fixing seat and rotates around the door fixing seat, and the elastic force of the elastic component drives the multi-joint self-closing hinge to move to the closed state.

[0011] Furthermore, the elastic component is provided with a mating surface, the door fixing seat includes a support shaft, and when the multi-joint self-closing hinge is in the first critical state, the mating surface abuts against the support shaft, and the elastic component rotates around the support shaft.

[0012] Furthermore, the elastic component includes a snap fastener, an elastic element, a trigger element, and a connecting shaft. The snap fastener is rotatably mounted on the second connecting element via the connecting shaft. Both ends of the elastic element abut against the snap fastener and the trigger element, respectively. The snap fastener is inserted into the trigger element. When the multi-joint self-closing hinge is in the fully open state, the trigger element is locked to the second connecting element. The mating surface is provided on the trigger element.

[0013] Furthermore, the trigger includes a locking block, and the second connector is provided with a snap-fit ​​hole. When the multi-joint self-closing hinge is in the fully open state, the locking block is located in the snap-fit ​​hole. When the multi-joint self-closing hinge is in the first critical state, the locking block separates from the snap-fit ​​hole.

[0014] Furthermore, the trigger includes a retaining pin, and the second connector is provided with a retaining groove. When the multi-joint self-closing hinge is in the fully open state, the retaining pin is located in the retaining groove. When the multi-joint self-closing hinge is in the first critical state, the retaining pin separates from the retaining groove.

[0015] Furthermore, the trigger member is provided with a insertion groove, and a stop block is provided at the end of the insertion groove. The latching member includes an insertion arm, and a latching protrusion is provided at the end of the insertion arm. The insertion arm is located in the insertion groove. When the multi-joint self-closing hinge is in the fully open state, the insertion arm is inserted into the insertion groove. When the multi-joint self-closing hinge is in the first critical state, the insertion groove moves relative to the insertion arm until the latching protrusion abuts against the stop block.

[0016] Furthermore, the second connector includes two side plates and a connecting plate connecting the two side plates, forming a receiving space between the two side plates, and the elastic component is located within the receiving space.

[0017] Furthermore, the fourth connector is provided with a third hinge hole, a fourth hinge hole and a fifth hinge hole. The fourth connector is rotatably connected to the first connector through the third hinge hole, the fourth connector is rotatably connected to the third connector through the fourth hinge hole, and the fourth connector is rotatably connected to the door body fixing seat through the fifth hinge hole. The fourth hinge hole is located between the third hinge hole and the fifth hinge hole.

[0018] Furthermore, the fourth connector includes a push plate, and the multi-joint self-closing hinge also includes a deceleration assembly. When the multi-joint self-closing hinge is in the second critical state, the push plate abuts against the deceleration assembly.

[0019] Furthermore, the deceleration assembly includes a stop, a damping sleeve, and a damping rod. The damping rod is installed on the damping sleeve, and the top end of the damping rod is connected to the stop. The stop has an abutment surface. When the multi-joint self-closing hinge is in a fully open state and a first critical state, the push plate separates from the abutment surface. When the multi-joint self-closing hinge is in a second critical state, the push plate abuts against the abutment surface.

[0020] Furthermore, the deceleration assembly is installed within the first connector.

[0021] Furthermore, the stop member is provided with a limiting groove, and the first connecting member includes a limiting protrusion located in the limiting groove.

[0022] Furthermore, when the multi-joint self-closing hinge is in the fully open state, the cabinet fixing seat and the door fixing seat form an obtuse angle.

[0023] Furthermore, when the multi-joint self-closing hinge is in a fully closed state, the first connector, the second connector, the third connector, and the fourth connector are housed between the cabinet mounting base and the door mounting base, with the bottom of the cabinet mounting base parallel to the top of the door mounting base.

[0024] Compared with the prior art, the multi-joint self-closing hinge of the present invention has the following advantages:

[0025] (1) When the multi-joint self-closing hinge is in the fully open state, the elastic component is locked with the second connector and the elastic component is in the compressed state; when the multi-joint self-closing hinge is in the first critical state, the elastic component is unlocked with the second connector, the elastic component recovers its deformation and abuts against the door fixing seat and rotates around the door fixing seat, and the elastic force of the elastic component drives the multi-joint self-closing hinge to move to the closed state. Therefore, when the door is in the fully open state, the elastic component does not apply a closing force to the door, which can effectively avoid the impact risk to the user caused by the automatic closing of the door and improve the safety of use. It is also convenient for the user to take and put things; when the door rotates past the first critical state, the elastic component applies a closing force to the door, so that the door and the cabinet are finally completely closed.

[0026] (2) The multi-joint self-closing hinge also includes a deceleration component. When the door body turns through the second critical state, the push plate abuts against the deceleration component, which reduces the closing speed of the door body and improves the safety of the door body closing.

[0027] (3) The multi-joint self-closing hinge structure design allows the hinge to have a larger opening when it is open, making it suitable for different usage scenarios; when closed, the first connector, the second connector, the third connector and the fourth connector are housed between the cabinet fixing seat and the door fixing seat, making the hinge small in size and not taking up space.

[0028] (4) The first connector, the second connector, the third connector and the fourth connector are all double-side plate structures. During the closing or opening process of the multi-joint self-closing hinge, the first connector, the second connector, the third connector and the fourth connector are in different positions and form different gaps. At this time, the double-side plate structure of the connector plays a protective role for other components. Attached Figure Description

[0029] Figure 1 This is a perspective view of the multi-joint self-closing hinge of the present invention in a fully open state;

[0030] Figure 2 for Figure 1 A three-dimensional sectional view of a multi-joint self-closing hinge in its fully open state;

[0031] Figure 3 for Figure 1 A perspective view of the second connector of a multi-joint self-closing hinge;

[0032] Figure 4 for Figure 2 A three-dimensional view of the elastic component of a multi-joint self-closing hinge;

[0033] Figure 5 for Figure 4 An exploded view of the elastic components;

[0034] Figure 6 for Figure 2 A three-dimensional view of a deceleration assembly with a multi-joint self-closing hinge;

[0035] Figure 7 for Figure 1 A three-dimensional diagram of a multi-joint self-closing hinge in its first critical state;

[0036] Figure 8 for Figure 1 A three-dimensional sectional view of a multi-joint self-closing hinge in its second critical state;

[0037] Figure 9 for Figure 1 A three-dimensional view of a multi-joint self-closing hinge in a fully closed state.

[0038] In the diagram: 10. Cabinet mounting base; 11. Receiving slot; 20. Door mounting base; 21. Main body; 22. Support component; 221. Support shaft; 30. First connecting component; 31. Limiting protrusion; 40. Second connecting component; 41. Side plate; 410. Slot; 411. First mounting hole; 412. First hinge hole; 413. Second hinge hole; 42. Connecting plate; 420. Snap-on hole; 43. Receiving space; 50. Third connecting component; 60. Fourth connecting component; 61. Plate; 610. Third hinge hole; 611. Fourth hinge hole; 612. Fifth hinge hole; 6 2. Push plate; 70. Elastic component; 71. Buckle; 710. Mounting part; 7101. Mounting hole; 711. Plug arm; 7110. Buckle protrusion; 712. Mounting post; 72. Elastic component; 73. Trigger; 730. First plug part; 731. Second plug part; 7311. Plug groove; 7312. Stop block; 732. Top; 734. Locking block; 735. Locking shaft; 736. Mating surface; 74. Connecting shaft; 80. Deceleration component; 81. Stop; 810. Abutment surface; 811. Limiting groove; 82. Damping sleeve; 83. Damping rod. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] like Figure 1 as well as Figure 2 As shown, the multi-joint self-closing hinge of the present invention includes a cabinet fixing seat 10, a door fixing seat 20, a first connector 30, a second connector 40, a third connector 50, a fourth connector 60, an elastic component 70, and a deceleration component 80.

[0043] The cabinet mounting base 10 is used to fix the cabinet. In this embodiment, a multi-joint self-closing hinge is applied to the refrigerator, and the cabinet mounting base 10 is fixed to the refrigerator cabinet. The cabinet mounting base 10 is provided with a receiving groove 11 for receiving the first connector 30, the second connector 40, the third connector 50 and the fourth connector 60 when the hinge is closed.

[0044] The door mounting bracket 20 is used to fix the door. In this embodiment, a multi-joint self-closing hinge is applied to the refrigerator, and the door mounting bracket 20 is fixed to the refrigerator door. The door mounting bracket 20 includes a main body 21 and a support member 22 fixed to the main body 21. The bottom of the main body 21 is flat, and the support member 22 is located at the end of the main body 21. The support member 22 has a double-plate design and an overall triangular structure to increase structural strength. The support member 22 is provided with a support shaft 221.

[0045] The first connector 30 features a double-plate design with a U-shaped cross-section. This design increases structural strength while allowing for the internal storage of other components, reducing the hinge's size and protecting these components. The first end of the first connector 30 is rotatably connected to the cabinet mounting base 10. The second end of the first connector 30 is rotatably connected to the second connector 40. The first connector 30 includes a limiting protrusion 31, which restricts the movement distance of the deceleration assembly 80.

[0046] Please continue reading. Figure 3 The second connector 40 includes two side plates 41 and a connecting plate 42. The connecting plate 42 is located between and connects the two side plates 41. The two side plates 41 are parallel to each other, forming a receiving space 43 between them. The receiving space 43 is used to install and receive the elastic component 70. Each side plate 41 is provided with a slot 410, a first mounting hole 411, a first hinge hole 412, and a second hinge hole 413. The slot 410 receives a retaining pin 735, thereby locking the elastic component 70 with the second connector 40. Specifically, the slot 410 is arc-shaped and has an open end, allowing the retaining pin 735 to disengage from the slot 410, thus unlocking the elastic component 70 from the second connector 40. The first hinge hole 412 and the second hinge hole 413 are located at opposite ends of the side plate 41, and the first mounting hole 411 is located between the first hinge hole 412 and the second hinge hole 413, near the first mounting hole 411. The first mounting hole 411 is used to install the elastic component 70, allowing the elastic component 70 to be rotatably mounted on the second connector 40 and located in the receiving space 43. The first hinge hole 412 is rotatably connected to the second end of the first connector 30, and the second hinge hole 413 is rotatably connected to the door fixing seat 20. The connecting plate 42 is provided with a snap-fit ​​hole 420, which is used to snap with the snap-fit ​​block 734, thereby locking the elastic component 70 to the second connector 40.

[0047] Please continue reading. Figure 2 The third connector 50 is a straight-line design. The first end of the third connector 50 is rotatably connected to the cabinet fixing base 10, and the second end of the third connector 50 is connected to the fourth connector 60.

[0048] The fourth connector 60 is a double-plate design. While increasing structural strength, the interior of the fourth connector 60 can accommodate other components, reducing the hinge's volume and protecting these components. The fourth connector 60 includes two plates 61 and a push plate 62. The two plates 61 are parallel to each other, and the push plate 62 connects to the edges of the two plates 61 on both sides. Each plate 61 has a third hinge hole 610, a fourth hinge hole 611, and a fifth hinge hole 612. The third hinge hole 610 and the fifth hinge hole 612 are located at opposite ends of the plate 61, and the fourth hinge hole 611 is located between the third hinge hole 610 and the fifth hinge hole 612. The third hinge hole 610 is hinged to the middle of the first connector 30. The fourth hinge hole 611 is hinged to the end of the third connector 50, and the fifth hinge hole 612 is hinged to the door fixing seat 20.

[0049] Please continue reading. Figures 4 to 5 The elastic component 70 is used to provide a preload force to the hinge when it is closed. The elastic component 70 includes a snap-fit ​​element 71, an elastic element 72, a trigger element 73, and a connecting shaft 74.

[0050] The latching member 71 includes a mounting portion 710, a plug-in arm 711, and a mounting post 712. The mounting portion 710 has a mounting hole 7101 for mounting a connecting shaft 74, allowing the elastic component 70 to be rotatably mounted on the second connector 40 via the connecting shaft 74. The plug-in arm 711 extends from the mounting portion 710 and plugs into a trigger member 73, maintaining a proper fit between the latching member 71 and the trigger member 73. Multiple plug-in arms 711 are used to ensure stable engagement between the latching member 71 and the trigger member 73. Specifically, in this embodiment, two plug-in arms 711 are used, symmetrically arranged relative to the mounting portion 710. Each plug-in arm 711 has a latching protrusion 7110 at its end away from the mounting portion 710, which latches with a stop block 7312 to prevent the plug-in arm 711 from disengaging from the plug-in groove 7311. Mounting post 712 extends from mounting portion 710 and is located between two plug arms 711. Mounting post 712 is used to mount elastic member 72 and guide elastic member 72.

[0051] The elastic element 72 abuts against the latching element 71 and the trigger element 73 at both ends, providing elastic force to the trigger element 73, so that the trigger element 73 provides a pre-tightening force for closing the door fixing seat 20. The elastic element 72 can be any one of a spring, disc spring, spring sheet, or compression spring. Specifically, in this embodiment, the elastic element 72 is preferably a spring, and the elastic element 72 is sleeved on the mounting post 712.

[0052] The trigger 73 includes a first insertion portion 730, a second insertion portion 731, a top 732, a locking block 734, a locking shaft 735, and a mating surface 736. The top 732 connects the first insertion portion 730 and the second insertion portion 731, forming a space between the first insertion portion 730 and the second insertion portion 731 for accommodating the elastic member 72 and the mounting post 712. Both the first insertion portion 730 and the second insertion portion 731 are provided with insertion grooves 7311 and stop blocks 7312 located at the ends of the insertion grooves 7311. The insertion grooves 7311 cooperate with the insertion arms 711, so that when the trigger 73 is unlocked from the second connecting member 40, the trigger 73 slides relative to the locking member 71 under the elastic force of the elastic member 72 to cooperate with the support shaft 221. The stop block 7312 limits the movement distance of the trigger 73. A locking block 734 is disposed at the second insertion part 731, and the locking block 734 is used to engage with the latching hole 420 to lock the elastic component 70 and the second connecting member 40. A locking shaft 735 is disposed at the first insertion part 730, and the locking shaft 735 is used to engage with the locking groove 410 to lock the elastic component 70 and the second connecting member 40. A mating surface 736 is disposed at the top 732. The mating surface 736 is an arc surface. The mating surface 736 can engage with the support shaft 221, allowing the elastic component 70 to rotate around the support shaft 221 and provide pre-tightening force to the door fixing seat 20 to ensure that the door and cabinet are finally closed.

[0053] The connecting shaft 74 is installed in the mounting hole 7101 and cooperates with the first mounting hole 411 of the second connector 40, so that the elastic component 70 is rotatably installed on the second connector 40 through the connecting shaft 74.

[0054] Please continue reading. Figure 6 The deceleration assembly 80 includes a stop 81, a damping sleeve 82, and a damping rod 83.

[0055] The damping sleeve 82 is installed inside the first connecting member 30. A portion of the damping rod 83 is located inside the damping sleeve 82, and the end of the damping rod 83 outside the damping sleeve 82 is connected to the stop member 81. The end of the stop member 81 has an abutment surface 810, which is curved. A limiting groove 811 is provided on the side of the stop member 81, and the limiting groove 811 is arranged along the moving direction of the stop member 81. A limiting protrusion 31 is located in the limiting groove 811, limiting the extreme position of the stop member 81's movement.

[0056] When using a multi-joint self-closing hinge, the cabinet mounting base 10 is fixedly connected to the cabinet, and the door mounting base 20 is fixedly connected to the door. When the hinge is in the fully open state, as shown in the attached... Figure 1-2 As shown, the angle between the door fixing seat 20 and the cabinet fixing seat 10 is obtuse, which meets the large opening requirement of the hinge. At this time, the locking pin 735 and the locking groove 410 of the elastic component 70 are engaged, the locking block 734 and the locking hole 420 are engaged, the elastic component 70 is locked with the second connecting member 40, and the elastic component 72 is in a compressed state. The trigger member 73 does not contact the support shaft 221 of the door fixing seat 20, that is, the elastic component 70 does not apply elastic force (closing preload) to the door fixing seat 20, and the door remains open, making it convenient for the user to take and put things. When it is necessary to close the door, an external force is applied to the door, and the door begins to close. The hinge changes from the fully open state to the first critical state. When the hinge is in the first critical state, as shown in the attached figure... Figure 7 As shown, the latch 734 disengages from the latch hole 420, the latch shaft 735 slides out of the latch groove 410, the elastic component 70 unlocks from the second connecting member 40, the elastic element 72 returns to its original deformation, and the trigger member 73 slides relative to the latch member 71 under the elastic force of the elastic element 72 until the mating surface 736 abuts against the support shaft 221. Under the elastic force of the elastic element 72, the elastic component 70 rotates around the support shaft 221, and at the same time, the elastic force of the elastic element 72 is transmitted to the door fixing seat 20, causing the hinge to move towards a fully closed state. When the hinge moves to the second critical state, as shown in the attached... Figure 8 As shown, the push plate 62 of the fourth connector 60 abuts against the contact surface 810 of the stop 81. The stop 81 moves relative to the damping sleeve 82 and generates a damping force that reacts on the fourth connector 60, reducing the hinge closing speed until the hinge is fully closed. Figure 9As shown. At this time, the first connector 30, the second connector 40, the third connector 50 and the fourth connector 60 are housed between the cabinet fixing seat 10 and the door fixing seat 20, with the bottom of the cabinet fixing seat 10 parallel to the top of the door fixing seat 20.

[0057] In this application, when the multi-joint self-closing hinge is in the fully open state, the elastic component 70 is locked to the second connecting member 40 and the elastic component 70 is in a compressed state. When the multi-joint self-closing hinge is in the first critical state, the elastic component 70 is unlocked from the second connecting member 40, the elastic component 70 recovers its deformation and abuts against the door fixing seat 20 and rotates around the door fixing seat 20. The elastic force of the elastic component 70 drives the multi-joint self-closing hinge to move towards the closed state. Therefore, when the door is in the fully open state, the elastic component 70 does not apply a closing force to the door, making it convenient for the user to take things in and out. When the door rotates past the first critical state, the elastic component 70 applies a closing force to the door, so that the door and cabinet are finally completely closed. When the door rotates past the second critical state, the push plate 62 abuts against the deceleration component 80, reducing the closing speed of the door and improving the safety of the door closing. The four connectors of the multi-joint self-closing hinge allow for a wider opening angle, suitable for various usage scenarios. When closed, the first connector 30, the second connector 40, the third connector 50, and the fourth connector 60 are housed between the cabinet mounting base 10 and the door mounting base 20, resulting in a compact hinge that doesn't occupy much space. The first connector 30, the second connector 40, and the fourth connector 60 are all double-plate structures. During the closing or opening process, the first connector 30, the second connector 40, the third connector 50, and the fourth connector 60 are in different positions and form different gaps. At this time, the double-plate structure of the connectors protects other components.

[0058] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A multi-joint self-closing hinge, comprising a cabinet mounting base and a door mounting base, characterized in that: The multi-joint self-closing hinge further includes a first connector, a second connector, a third connector, a fourth connector, and an elastic component. The two ends of the first connector are rotatably connected to the cabinet fixing base and the second connector, respectively. The two ends of the second connector are rotatably connected to the first connector and the door fixing base, respectively. The two ends of the third connector are rotatably connected to the cabinet fixing base and the fourth connector, respectively. The two ends of the fourth connector are rotatably connected to the first connector and the door fixing base, respectively. The elastic component is rotatably installed on the second connector. When the multi-joint self-closing hinge is in the fully open state, the elastic component is locked to the second connector and the elastic component is in the compressed state; When the multi-joint self-closing hinge is in the first critical state, the elastic component unlocks from the second connecting member, the elastic component recovers its deformation and abuts against the door fixing seat and rotates around the door fixing seat, the elastic force of the elastic component drives the multi-joint self-closing hinge to move to the closed state, the elastic component has a mating surface, the door fixing seat includes a support shaft, when the multi-joint self-closing hinge is in the first critical state, the mating surface abuts against the support shaft, the elastic component rotates around the support shaft, the elastic component includes a latching member, an elastic member, a trigger member and a connecting shaft, the latching member is rotatably installed on the second connecting member through the connecting shaft, the two ends of the elastic member abut against the latching member and the trigger member respectively, the latching member and the trigger member are inserted, when the multi-joint self-closing hinge is in the fully open state, the trigger member is locked to the second connecting member, the mating surface is provided on the trigger member.

2. The multi-joint self-closing hinge according to claim 1, characterized in that: The trigger includes a locking block, and the second connector has a snap-fit ​​hole. When the multi-joint self-closing hinge is in the fully open state, the locking block is located in the snap-fit ​​hole. When the multi-joint self-closing hinge is in the first critical state, the locking block separates from the snap-fit ​​hole.

3. The multi-joint self-closing hinge according to claim 1, characterized in that: The trigger includes a retaining pin, and the second connector is provided with a retaining groove. When the multi-joint self-closing hinge is in the fully open state, the retaining pin is located in the retaining groove. When the multi-joint self-closing hinge is in the first critical state, the retaining pin separates from the retaining groove.

4. The multi-joint self-closing hinge according to claim 1, characterized in that: The trigger member is provided with a plug groove, and a stop block is provided at the end of the plug groove. The fastening member includes a plug arm, and a fastening protrusion is provided at the end of the plug arm. The plug arm is located in the plug groove. When the multi-joint self-closing hinge is in the fully open state, the plug arm is inserted into the plug groove. When the multi-joint self-closing hinge is in the first critical state, the plug groove moves relative to the plug arm until the fastening protrusion abuts against the stop block.

5. The multi-joint self-closing hinge according to claim 1, characterized in that: The second connector includes two side plates and a connecting plate connecting the two side plates, forming a receiving space between the two side plates, and the elastic component is located within the receiving space.

6. The multi-joint self-closing hinge according to claim 1, characterized in that: The fourth connector is provided with a third hinge hole, a fourth hinge hole and a fifth hinge hole. The fourth connector is rotatably connected to the first connector through the third hinge hole, the fourth connector is rotatably connected to the third connector through the fourth hinge hole, and the fourth connector is rotatably connected to the door body fixing seat through the fifth hinge hole. The fourth hinge hole is located between the third hinge hole and the fifth hinge hole.

7. The multi-joint self-closing hinge according to claim 1, characterized in that: The fourth connector includes a push plate, and the multi-joint self-closing hinge also includes a deceleration assembly. When the multi-joint self-closing hinge is in the second critical state, the push plate abuts against the deceleration assembly.

8. The multi-joint self-closing hinge according to claim 7, characterized in that: The deceleration assembly includes a stop, a damping sleeve, and a damping rod. The damping rod is installed on the damping sleeve, and the top end of the damping rod is connected to the stop. The stop has an abutment surface. When the multi-joint self-closing hinge is in a fully open state and a first critical state, the push plate separates from the abutment surface. When the multi-joint self-closing hinge is in a second critical state, the push plate abuts against the abutment surface.

9. The multi-joint self-closing hinge according to claim 8, characterized in that: The deceleration assembly is installed inside the first connector.

10. The multi-joint self-closing hinge according to claim 9, characterized in that: The stop member is provided with a limiting groove, and the first connecting member includes a limiting protrusion, which is located in the limiting groove.

11. The multi-joint self-closing hinge according to claim 1, characterized in that: When the multi-joint self-closing hinge is in the fully open state, the cabinet fixing seat and the door fixing seat form an obtuse angle.

12. The multi-joint self-closing hinge according to claim 1, characterized in that: When the multi-joint self-closing hinge is in a fully closed state, the first connector, the second connector, the third connector, and the fourth connector are housed between the cabinet mounting base and the door mounting base, with the bottom of the cabinet mounting base parallel to the top of the door mounting base.

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