Transmission mechanism for a hinge and sunken hinge

Abstract

The utility model belongs to the technical field of storage cabinet accessories, specifically relates to a transmission mechanism for hinge and sunken hinge. Among them, transmission mechanism includes swing mechanism and buffer device, the buffer device includes the transmission arm that sets up horizontally, buffer cylinder and sliding block, the front and back both ends of sliding block are connected transmission arm and buffer cylinder respectively, and are connected with the back side of swing mechanism through transmission arm, to make the buffer device horizontal place in the back side of swing mechanism. The utility model discloses through the horizontal arrangement of buffer cylinder, sliding block and other components, forms the compact horizontal transmission scheme, significantly reduces the overall height of hinge, makes the cabinet body lateral wall more level and beautiful, avoids the problem that traditional convex hinge is easy to collide simultaneously, the design through the connecting mode of optimization transmission arm and swing mechanism, makes the buffer force even transmission along the horizontal direction, not only improves the stability and fluency of door body opening and closing, also strengthens the bearing capacity of structure.

Description

Technical Field

[0001] This utility model belongs to the technical field of locker accessories, specifically relating to a transmission mechanism for hinges and a recessed hinge. Background Technology

[0002] Currently, the common structure of hinges installed between cabinets and doors mainly consists of a base assembly, a hinge cup, and a linkage mechanism. The base assembly, as the part that fixes the hinge to the cabinet, is usually designed to protrude radially inwards towards the inside of the cabinet. This protruding design not only enhances the stability of the base assembly against the cabinet side wall but also provides ample space for the door to rotate. The hinge cup is the part installed on the door, while the linkage mechanism plays a crucial role in connecting the base assembly and the hinge cup, determining the opening and closing method and stability of the door. During the opening and closing process, the linkage mechanism transmits force between the base assembly and the hinge cup, allowing the door to rotate flexibly around the hinge's axis of rotation.

[0003] However, while the protruding design of the base assembly towards the cabinet side wall provides some flexibility and space for door rotation, it can also disrupt the overall lines and smoothness of the cabinet. Especially in furniture pursuing a minimalist style or modern design concept, this protruding base assembly can appear out of place, affecting the overall aesthetic appeal. For high-end or custom-made furniture, users often have higher requirements for detail and appearance; therefore, a protruding base assembly may not meet these stringent aesthetic standards.

[0004] Furthermore, the protruding base assembly may collide with people or objects during daily use. When a person moves around the cabinet, they may accidentally bump into the protruding base assembly, thus interfering with retrieving items. At the same time, because the protruding base assembly needs to bear the weight of the door and the load generated by the hinges, the cabinet sidewalls must have sufficient strength and stability. During the design process, multiple factors such as the choice of cabinet sidewall material, thickness setting, and installation method need to be comprehensively considered to ensure the sturdiness and safety of the protruding base assembly. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems caused by the existing hinges using a vertical stacking design, which results in the base assembly protruding from the side wall of the cabinet, and to provide a transmission mechanism for the hinges.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A transmission mechanism for a hinge includes a swing mechanism and a buffer device. The buffer device includes a horizontally arranged transmission arm, a buffer cylinder, and a slider. The front and rear ends of the slider are respectively connected to the transmission arm and the buffer cylinder. The transmission arm is connected to the rear side of the swing mechanism. When the swing mechanism swings around the connecting fulcrum, it drives the slider to perform horizontal reciprocating motion through the transmission arm and causes the slider to selectively trigger the buffer cylinder.

[0008] This invention, by horizontally arranging components such as the buffer cylinder and slider to form a compact horizontal transmission scheme, significantly reduces the overall height of the hinge, making the cabinet sidewalls flatter and more aesthetically pleasing, while avoiding the collision problems of traditional protruding hinges. This design optimizes the connection between the transmission arm and the swing mechanism, ensuring the buffer force is evenly transmitted horizontally. This not only improves the stability and smoothness of door opening and closing but also enhances the structural load-bearing capacity, making it particularly suitable for heavy-duty doors. Furthermore, the horizontally arranged buffer device results in a more rational force distribution, reducing component wear and extending service life. Its flat structure also simplifies installation and improves adaptability, allowing for wide application in modern minimalist furniture and various customized scenarios, maximizing space utilization while ensuring performance.

[0009] Furthermore, the swing mechanism includes a first swing arm and a second swing arm. One end of each of the first and second swing arms is a fixed end, and the other end is a swing end. The fixed end has a first connecting fulcrum for connecting to the base assembly, and the swing end has a second connecting fulcrum for connecting to the hinge cup. The second swing arm has a third connecting fulcrum. The first and second swing arms form a four-bar linkage through the first and second connecting fulcrums. The two fixed ends are distributed front to back and are nearly flush in height. The buffer device is horizontally placed at the rear of the swing mechanism and connected to the third connecting fulcrum via a transmission arm. In this design, the four-bar linkage has two states: open and closed. When open, the swing end of the first swing arm is located below the swing end of the first swing arm; when closed, the swing end of the first swing arm is located below the swing end of the second swing arm. Compared with the prior art, the transmission mechanism of this invention is installed on a recessed hinge. During assembly, the transmission mechanism needs to be rotated 90 degrees along with the recessed hinge before being fixed to the side panel of the cabinet. Because the two fixed ends are distributed front and back and are almost flush at the same height, with a small height difference, and the buffer device is placed horizontally, vertical space can be saved, allowing the base to be compressed downwards, resulting in a flatter and thinner overall shape, thereby reducing protrusion.

[0010] Furthermore, the first swing arm has a downward and backward bending positioning corner on the side near the swing end. In this solution, the first swing arm has a downward and backward bending positioning corner on the side near the swing end. Through the geometric design of the positioning corner, a larger door opening angle can be achieved within a limited swing space, so that the door opening angle can reach 120°.

[0011] Furthermore, one end of the transmission arm is provided with an open semi-circular hole, through which the transmission arm is connected to the buffer device.

[0012] Furthermore, the front end of the slider is provided with a recess, and a connecting shaft is provided at the recess. One end of the transmission arm is sleeved on the connecting shaft.

[0013] Furthermore, the third connecting fulcrum of the second swing arm is positioned on the side closest to the fixed end. In this design, the third connecting fulcrum is closer to the fixed end, resulting in a shorter lever arm length for the transmission arm. This directly impacts the vertical space requirements, significantly reducing the swing arm's range of motion in the vertical direction and thus lowering the overall hinge height.

[0014] Another objective of this invention is to provide a recessed hinge, comprising a base assembly, a hinge cup, and a transmission mechanism as described above. The base assembly includes a base body, a connecting arm, and an outer cover. The base body has a base receiving portion and a mounting structure. The base body is fixedly connected to the cabinet via the mounting structure. The connecting arm is slidably mounted on the base receiving portion. The transmission mechanism is located on the connecting arm. The connecting arm and the hinge cup are connected via the swing mechanism. The outer cover is located on the base body. Because this invention utilizes the transmission mechanism described above, it possesses all the advantages of the aforementioned solution. Furthermore, the outer cover protects and shields the base assembly, preventing rubbing against the structure of the recessed hinge when a person moves around the cabinet, thus avoiding interference with retrieving items.

[0015] Furthermore, the base receiving portion is formed by a recess in the base body, and the front end of the base receiving portion is open. The connecting arm includes a receiving portion and a swing arm connecting portion. The receiving portion is designed as a U-shaped structure adapted to the base receiving portion, and a hinge arm receiving groove is formed on its inner side. The buffer device is disposed in the hinge arm receiving groove. The swing arm connecting portion is connected to the front end of the receiving portion and is used for swing mechanism connection. In this solution, the base receiving portion is formed by a recess in the base, and its opening is located at the upper end and the front end. In this way, the side wall of the cabinet can be pre-set in the groove adapted to the base receiving portion, which can further reduce the height of the recessed hinge protruding from the base. In this solution, the base receiving portion has its opening located at the upper end and the front end. This design allows the side wall of the cabinet to be pre-set in the groove adapted to the base receiving portion. Placing the base receiving portion in the groove further reduces the height of the recessed hinge protruding from the base. At the same time, the nested structure of the U-shaped hinge arm receiving groove of the connecting arm and the base receiving portion can distribute the weight of the door to the groove of the cabinet side wall, reducing local stress concentration.

[0016] Furthermore, a drive mechanism is included, mounted on the connecting arm. The buffer device also includes a buffer cylinder and a slider. The front and rear ends of the slider are connected to the buffer cylinder and the transmission arm, respectively, and its side abuts against the drive end of the drive mechanism. When subjected to backward pressure, the buffer device moves backward as a whole, triggering the drive mechanism to provide a backward driving force for the buffer device. This solution adds a drive mechanism that works in conjunction with the buffer device. When the buffer device is subjected to backward pressure, the drive mechanism provides it with a backward driving force, achieving automatic buffering and driving during the door closing process, reducing the force required for manual operation by the user. Especially when the door is close to closing, the two work together to automatically complete the closing action, requiring only a gentle push from the user.

[0017] Furthermore, the driving mechanism includes a V-shaped rocker mechanism. The connecting arm is provided with a first positioning groove and a mounting shaft. One end of the V-shaped rocker mechanism is rotatably mounted on the mounting shaft, and the other end is provided with an elastic element and is retractably connected to the first positioning groove. The bottom of the V-shaped rocker mechanism is the driving part. The slider is adapted to the driving part and is provided with a pressure-bearing groove. The driving part abuts against the rear side wall of the slider, and the pressure-bearing groove is located on the front side of its driving part. When the slider moves backward, the driving part slides into the pressure-bearing groove, and the elastic force of the elastic element is applied to the rear side wall of the pressure-bearing groove through the driving part. In this solution, when the recessed hinge switches from the open state to the closed state, the slider first moves backward, the driving part slides into the pressure-bearing groove, the elastic force of the elastic element is released and drives the V-shaped rocker mechanism to swing backward, thereby causing the driving part to move backward and abut against the rear side wall of the pressure-bearing groove. The driving part applies a force to the rear side wall of the pressure-bearing groove, thereby driving the slider to continue to move backward. When the recessed hinge switches from the closed to the open state, the slider moves forward, the pressure groove separates from the drive unit, and the rear side wall of the slider remains in contact with the drive unit. Under the action of friction between the two, the V-shaped rocker mechanism swings forward and compresses the elastic element, completing the switch to the open state. Through the design of this scheme, the synergistic action of the drive mechanism and the slider realizes the automatic drive and buffering function of the recessed hinge during the switching process between the open and closed states, improving the smoothness and stability of operation.

[0018] Furthermore, the slider includes a sliding block and a housing. The sliding block includes a first connecting wall, a second connecting wall, and a third connecting wall. The second connecting wall is disposed opposite to both sides of the front end of the first connecting wall. The second connecting wall is provided with a third hinge hole. The connecting shaft is disposed on the sliding block through the third hinge hole. The third connecting wall is disposed at the rear end of the first connecting wall. One side of the middle part of the first connecting wall is provided with a pressure-bearing groove. The housing is adapted to the shape of the sliding block and covers the sliding block.

[0019] Furthermore, the base assembly also includes a support frame, which is disposed on the lower side of the base body. The outer side of the base body protrudes radially from the support frame to form a connecting recess. The side edge of the outer cover is provided with a fastening part, which fastens onto the connecting recess. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the transmission mechanism in the closed state. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the transmission mechanism in the closed state. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the transmission mechanism in the closed state. Figure 3 ;

[0023] Figure 4 This is a schematic diagram of the transmission mechanism in the closed state. Figure 4 ;

[0024] Figure 5 Assembly of the slider and the swing mechanism in the open state Figure 1 .

[0025] Figure 6 Assembly of the slider and the swing mechanism in the open state Figure 2 .

[0026] Figure 7 This is a schematic diagram of the sunken hinge in the open position.

[0027] Figure 8 This is an exploded view of the sunken hinge in the closed state.

[0028] Figure 9 Schematic diagram of the connecting arm structure Figure 1 .

[0029] Figure 10 Schematic diagram of the connecting arm structure Figure 2 .

[0030] Figure 11 This is an assembly diagram of the buffer device and drive mechanism in the open state.

[0031] Figure 12 This is an exploded view of the base and connecting arm.

[0032] Figure 13 This is a schematic diagram of a recessed hinge in the closed state.

[0033] Figure 14 This is a schematic diagram of a sunken hinge in the closed state.

[0034] Figure 15 This is a schematic diagram of the recessed hinge in the closed state (outer cover not shown).

[0035] Label Explanation:

[0036] 1. Recessed hinge; 11. Hinge cup; 2. Transmission mechanism; 3. Swinging mechanism; 3. First swing arm; 31. First connecting rib; 311. First arm section; 312. Second arm section; 313. Positioning corner; 314. Second swing arm; 32. Second connecting rib; 321. Third arm section; 322. Fourth arm section; 323. Positioning arc surface; 324. Fixed end (31a, 32a); Swing end (31b, 32b); Connecting ear; 325. Buffer device; 4. Slider; 41. Recess; 43. Connecting shaft; 44. Sliding block; 45. First connecting wall; 451. Pressure groove; 451a; Second connecting wall; 452. Third hinge hole; 452a; Third connecting wall; 453. Housing; 46. Transmission arm; 47. Buffer cylinder; 48. Base assembly; 5. Base. Body 50, mounting structure 51, outward flange 511, clearance opening 52, third mounting hole 512, base receiving part 53, connecting arm 6, receiving part 61, swing arm connecting part 62, hinge arm receiving groove 613, drive mounting area 611, buffer mounting area 612, mounting shaft 614, elastic mounting part 616, first positioning groove 615, buffer mounting part 617, guide groove 631, guide hole 632, guide shaft pin 633, connecting rod 641, limiting hole 642, drive mechanism 7, elastic element 71, first drive rod 72, second drive rod 73, V-shaped rocker mechanism 74, support frame 8, first support part 81, second support part 82, first mounting hole 83, second mounting hole 84, outer cover 9. Detailed Implementation

[0037] The specific embodiments of this utility model are described below with reference to the accompanying drawings. In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Example 1:

[0039] See Figure 1-6As shown, this embodiment discloses a transmission mechanism 2 for a sinking hinge, including a swing mechanism 3 and a buffer device 4. The buffer device 4 includes a horizontally arranged transmission arm 47, a buffer cylinder 48, and a slider 41. The front and rear ends of the slider 41 are respectively connected to the transmission arm 47 and the buffer cylinder 48. The transmission arm 47 is connected to the rear side of the swing mechanism. When the swing mechanism 3 swings around the connecting fulcrum, the transmission arm 47 drives the slider 41 to perform horizontal reciprocating motion and causes the slider 41 to selectively trigger the buffer cylinder 48. The swing mechanism 3 includes a first swing arm 31 and a second swing arm 32. One end of each of the first swing arm 31 and the second swing arm 32 is a fixed end (31a, 32a), and the other end is a swing end (31b, 32b). The fixed ends (31a, 32a) have a first connecting fulcrum for connecting to the base assembly 5, and the swing ends (31b, 32b) have a second connecting fulcrum for connecting to the hinge cup 11. The second swing arm 32 has a third connecting fulcrum. The first swing arm 31 and the second swing arm 32 form a four-bar linkage through the first and second connecting fulcrums. The two fixed ends (31a, 32a) are connected by a first connecting fulcrum and a second connecting fulcrum. 32a) The first swing arm 31 is distributed front and back and is nearly level with the first swing arm 31. The side of the first swing arm 31 near the swing end 31b is provided with a positioning corner 314 that bends downward and backward. The four-bar linkage has an open state and a closed state. In the open state, the swing end 32b of the second swing arm 32 is located above the swing end 31b of the first swing arm 31. In the closed state, the swing end 32b of the second swing arm 32 is located below the swing end 31b of the first swing arm 31. The buffer device 4 is horizontally placed on the rear side of the swing mechanism 3. The buffer device 4 is connected to the third connecting fulcrum by a transmission arm 47.

[0040] The front end of the slider 41 is provided with a recess 43, and a connecting shaft 44 is provided at the recess 43. One end of the transmission arm 47 is sleeved on the connecting shaft 44.

[0041] The fixed ends (31a, 32a) and swing ends (31b, 32b) of the first swing arm 31 and the second swing arm 32 are axial. The fixed end 31a and the swing end 31b of the first swing arm 31 are connected by a first connecting rib 311, and the fixed end 32a and the swing end 32b of the second swing arm 32 are connected by a second connecting rib 321. The first connecting rib 311 includes a first arm section 312 connected to the fixed end 31a and a second arm section 313 connected to the swing end 31b. The front end of the first arm section 312 is connected to the upper end of the second arm section 313 and forms a positioning corner 314. The second connecting rib 321 includes a third arm section 322 connected to the fixed end 32a and a fourth arm section 323 connected to the swing end 32b. The rear ends of the third arm section 322 and the fourth arm section 323 are connected. Connecting ears 325 are provided on both sides of the lower end of the third arm section 322. The third connecting fulcrum is a round hole provided on the connecting ear 325.

[0042] The shape of the aforementioned positioning corner 314 is adapted to the swing end 32b of the second swing arm 32, and the sum of the lengths of the fourth arm 323 and the swing end 32b of the second swing arm 32 is equal to the length of the second arm 313.

[0043] The second swing arm 32 is provided with a positioning arc surface 324. The positioning arc surface 324 is located on the side near the swing end 32b and on the side adjacent to the first swing arm 31. When the sinking hinge 1 is in the closed state, the first swing arm 31 is located near the second swing arm 32.

[0044] The length of the third arm 322 is less than the length of the fourth arm 323, making the third connecting fulcrum eccentrically designed.

[0045] The second swing arm 32 has a low-curvature arc design, and the shapes of the first arm 312, the second arm 313 and the fourth arm 323 are adapted to each other.

[0046] The transmission mechanism 2 of this utility model is installed on the recessed hinge 1. During assembly, the transmission mechanism 2 needs to be rotated 90 degrees along with the recessed hinge 1 and then fixed to the side panel of the cabinet. Since the two fixed ends (31a, 32a) are distributed front and back and are almost flush at the same height, the height difference is small, and the buffer device 4 is placed horizontally, which can save vertical space, allowing the base assembly 5 to be compressed downward, resulting in a flatter and thinner overall shape, thereby reducing protrusion. The first swing arm 31 has a downward and backward positioning corner 314 on the side near the swing end 31b. Through the geometric design of the positioning corner 314, a larger door opening angle can be achieved within the limited swing space, so that the door opening angle can reach 120°.

[0047] Example 2:

[0048] See Figure 1-15As shown, another objective of this utility model is to provide a recessed hinge 1, which includes a base assembly 5, a hinge cup 11, and a transmission mechanism 2 as described above. The base assembly 5 includes a base body 50, a connecting arm 6, and an outer cover 9. The base body 50 is provided with a base receiving portion 53 and a mounting structure 51. The base body 50 is fixedly connected to the cabinet through the mounting structure 51. The connecting arm 6 is slidably mounted on the base receiving portion 53. The transmission mechanism 2 is provided on the connecting arm 6. The connecting arm 6 and the hinge cup 11 are connected through the swing mechanism 3. The outer cover 9 is provided on the base body 50.

[0049] The aforementioned base receiving portion 53 is formed by a recess in the base body 50, and the front end of the base receiving portion 53 is open. The connecting arm 6 includes a receiving portion 61 and a swing arm connecting portion 62. The receiving portion 61 is designed as a U-shaped structure that is adapted to the base receiving portion 53, and a hinge arm receiving groove 613 is formed on its inner side. The buffer device 4 is disposed in the hinge arm receiving groove 613. The swing arm connecting portion 62 is connected to the front end of the receiving portion 61 and is used for connecting the swing mechanism 3.

[0050] The aforementioned base assembly also includes a drive mechanism 7, which is mounted on the connecting arm 6. The side of the slider 41 abuts against the drive end of the drive mechanism 7. When subjected to backward pressure, the buffer device 4 moves backward as a whole, triggering the drive mechanism 7, which then provides a driving force for the buffer device 4 to move backward.

[0051] The aforementioned driving mechanism 7 includes an elastic element 71, a first driving rod 72, and a second driving rod 73. The left and right sides of the hinge arm receiving groove 613 are respectively set as a driving mounting area 611 and a buffer mounting area 612. The front part of the driving mounting area 611 is provided with an inclined elastic mounting part 616. The elastic mounting part 616 is provided with a first positioning groove 615. The middle part of the driving mounting area 611 is provided with a mounting shaft 614. One end of the first driving rod 72 and the second driving rod 73 is hinged to form a V-shaped rocker mechanism 74, and the bottom of the linkage mechanism 74 is its driving part. The elastic element 71 is sleeved on the second driving rod 73. The slider 41 is adapted to the driving part and is provided with a pressure-bearing groove 451a. The driving part abuts against the rear side wall of the slider 41, and the pressure-bearing groove 451a is located on the front side of its driving part.

[0052] The aforementioned slider 41 includes a sliding block 45 and a housing 46. The sliding block 45 includes a first connecting wall 451, a second connecting wall 452, and a third connecting wall 453. The second connecting wall 452 is disposed opposite to the front end of the first connecting wall 451. The second connecting wall 452 is provided with a third hinge hole 452a. The connecting shaft 44 is disposed on the sliding block 45 through the third hinge hole 452a. The third connecting wall 453 is disposed at the rear end of the first connecting wall 451. One side of the middle part of the first connecting wall 451 is provided with a pressure-bearing groove 451a. The housing 46 is adapted to the shape of the sliding block 45 and covers the sliding block 45.

[0053] The aforementioned base assembly 5 also includes a support frame 8, which is located on the lower side of the base body 50. The outer side of the base body 50 protrudes radially from the support frame 8 to form a connecting recess. The side edge of the outer cover is provided with a fastening part, which fastens onto the connecting recess, thereby connecting the base body 50 and the outer cover.

[0054] The aforementioned support frame 8 includes two opposing first support portions 81 and a second support portion 82 connected between the two first support portions 81. The first support portion 81 is provided with a first mounting hole 83 and a second mounting hole 84 for connecting with the cabinet. The mounting structure 51 includes an outward flange 511 provided along both sides of the base receiving portion 53. The outward flange 511 abuts against the first support portion 81. The middle part of the base receiving portion 53 is provided with a clearance opening 52 that matches the middle part of the second support portion 82. The outward flange 511 is provided with a third mounting hole 512. The first mounting hole 83 and the third mounting hole 512 are connected by screws. The middle part of the base body 50.

[0055] One end of the aforementioned transmission arm 47 is provided with a third hinge fulcrum, which is connected to the third connecting fulcrum via a connecting shaft 44. The other end is provided with an open semi-circular hole, through which the transmission arm 47 is assembled to the front end of the buffer device 4.

[0056] A linear limiting guide structure is provided between the connecting arm 6 and the base body 50, including a first guide mechanism and a second guide mechanism. The first guide mechanism is located at the front of the connecting arm 6 and the base body 50, and includes a guide groove 631, a guide hole 632, and a guide pin 633. The guide groove 631 is located on the base body 50 along its length, and the guide hole 632 is located on the connecting arm 6. The two are connected by the guide pin 633. The second guide mechanism is located at the rear of the connecting arm 6 and the base body 50, and includes a connecting rod 641 and a limiting hole 642. The limiting hole 642 is located on opposite sides of the base body 50. The connecting arm 6 has through holes on both sides to cooperate with the connecting rod 641. The connecting rod 641 is laterally mounted on the connecting arm 6 through the holes. Furthermore, a buffer mounting part 617 is provided at the rear of the hinge arm receiving groove 613. The buffer mounting part 617 has a second positioning groove, and the rod body of the buffer rod is mounted on the second positioning groove.

[0057] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A transmission mechanism for a hinge, characterized in that, It includes a swing mechanism (3) and a buffer device (4). The buffer device (4) includes a horizontally arranged transmission arm (47), a buffer cylinder (48), and a slider (41). The front and rear ends of the slider (41) are connected to the transmission arm (47) and the buffer cylinder (48) respectively. The transmission arm (47) is connected to the rear side of the swing mechanism. When the swing mechanism (3) swings around the connecting fulcrum, the transmission arm (47) drives the slider (41) to make horizontal reciprocating motion and causes the slider (41) to selectively trigger the buffer cylinder (48).

2. The transmission mechanism according to claim 1, characterized in that, The swing mechanism (3) includes a first swing arm (31) and a second swing arm (32). One end of the first swing arm (31) and the second swing arm (32) is a fixed end (31a, 32a), and the other end is a swing end (31b, 32b). The fixed end (31a, 32a) is provided with a first connecting fulcrum, and the swing end (31b, 32b) is provided with a second connecting fulcrum. The second swing arm (32) is also provided with a third connecting fulcrum for connecting with the transmission arm. The first swing arm (31) and the second swing arm (32) form a four-bar linkage through the first connecting fulcrum and the second connecting fulcrum. The two fixed ends (31a, 32a) are distributed in front and behind and are close to the same height.

3. The transmission mechanism according to claim 2, characterized in that, The first swing arm (31) has a positioning corner (314) that bends downward and backward on the side near the swing end (31b).

4. The transmission mechanism according to claim 1, characterized in that, The front end of the slider (41) is provided with a recess (43), and a connecting shaft (44) is provided at the recess (43). One end of the transmission arm (47) is sleeved on the connecting shaft (44).

5. The transmission mechanism according to claim 1 or 4, characterized in that, One end of the transmission arm (47) is provided with an open semi-circular hole, and the transmission arm (47) is connected to the slider through the open semi-circular hole.

6. The transmission mechanism according to claim 2, characterized in that, The third connection point of the second swing arm is located on the side closer to the fixed end.

7. A recessed hinge, characterized in that, The device includes a base assembly (5), a hinge cup (11), and a transmission mechanism (2) according to any one of claims 1-5. The base assembly (5) includes a base body (50) and a connecting arm (6). The base body (50) is provided with a base receiving portion (53) and a mounting structure (51). The base body (50) is fixedly connected to the cabinet through the mounting structure (51). The connecting arm (6) is slidably mounted on the base receiving portion (53). The transmission mechanism (2) is provided on the connecting arm (6). The connecting arm (6) and the hinge cup (11) are connected through the swing mechanism (3).

8. The recessed hinge according to claim 7, characterized in that, The base receiving part (53) is formed by the recess of the base body (50) and the front end of the base receiving part (53) is open. The connecting arm (6) includes a receiving part (61) and a swing arm connecting part (62). The receiving part (61) is designed as a U-shaped structure that is adapted to the base receiving part (53), and a hinge arm receiving groove (613) is formed on its inner side. The buffer device (4) is located in the hinge arm receiving groove (613). The swing arm connecting part (62) is connected to the front end of the receiving part (61) and is used for the connection of the swing mechanism (3).

9. The recessed hinge according to claim 7, characterized in that, It also includes a drive mechanism (7), which is located on the connecting arm (6). The side of the buffer device abuts against the drive end of the drive mechanism (7). After being subjected to backward pressure, the buffer device (4) moves backward as a whole and triggers the drive mechanism (7), so that the drive mechanism (7) provides the buffer device (4) with a backward driving force.

10. The recessed hinge according to claim 9, characterized in that, The drive mechanism (7) includes a V-shaped rocker mechanism (74). The connecting arm (6) is provided with a first positioning groove (615) and a mounting shaft (614). One end of the V-shaped rocker mechanism (74) is rotatably mounted on the mounting shaft (614), and the other end is provided with an elastic element (71) and is telescopically connected to the first positioning groove (615). The bottom of the V-shaped rocker mechanism (74) is the drive part. The slider (41) is adapted to the drive part and is provided with a pressure-bearing groove (451a). The drive part abuts against the rear side wall of the slider (41), and the pressure-bearing groove (451a) is located on the front side of its drive part. When the slider (41) moves backward, the drive part slides into the pressure-bearing groove (451a), and the elastic force of the elastic element (71) is applied to the rear side wall of the pressure-bearing groove (451a) through the drive part.

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