Cabinet door connecting device and storage cabinet

Abstract

The invention belongs to the technical field of storage cabinets, and particularly relates to a cabinet door connecting device and a storage cabinet, the cabinet door connecting device is composed of a base unit, a hinge cup and a transmission rod system, and the transmission rod system comprises a swing arm mechanism and a horizontally rear buffer device. The swing arm mechanism is of a four-connecting-rod structure and is composed of a first swing arm and a second swing arm, the fixed ends of the two swing arms are arranged in a front-back flush mode and connected with the base unit, the swing ends of the two swing arms are connected with the hinge cup, and the second swing arm is in a low-curvature arc shape and is provided with a third connecting fulcrum to be connected with a transmission arm of the buffering device. The swing end of the first swing arm is provided with a positioning corner which is bent downwards and backwards, the shape of the positioning corner is matched with that of the swing end of the second swing arm, a large opening angle of 120 degrees is achieved, and mechanical limiting is provided. By utilizing the design of the parallel and level fixed ends and the horizontal buffer device, the occupied vertical space is obviously reduced, the structure is flatter, and the side wall protrusion of the cabinet body is reduced. The cabinet door connecting device of the scheme is applied to the storage cabinet.

Description

Technical Field

[0001] The present invention belongs to the technical field of storage cabinets, and particularly relates to a cabinet door connection device and a storage cabinet. Background Art

[0002] The common cabinet door connection devices in modern furniture mainly consist of three parts: a base unit fixed to the side plate of the cabinet body, a hinge cup installed on the door panel, and a transmission rod system connecting the two. As the fixed end of the hinge, the design feature of the base unit is to extend and protrude towards the interior of the cabinet body. This special structure not only improves the installation firmness of the hinge on the side plate but also reserves enough movement range for the rotation of the door panel. The hinge cup is responsible for connecting with the door panel, and the transmission rod system undertakes the important function of coordinating the movement between the base unit and the hinge cup, which is directly related to the smooth opening and closing and service durability of the door panel. When the door panel is opened or closed, the transmission rod system transmits power between the base unit and the hinge cup to ensure that the door panel can rotate smoothly along the hinge axis.

[0003] However, although this inwardly protruding base design optimizes the rotation performance of the door panel, it may affect the integrity of the cabinet appearance. In furniture designs that emphasize minimalist aesthetics or modern styles, the protruding base structure often breaks the flatness of the cabinet surface and reduces the visual quality of the product. For high-end customized furniture that pays attention to technological details, this obvious structural protrusion often fails to meet the refined requirements of customers for the product appearance.

[0004] From a practical perspective, the protruding base structure also has other potential problems. When users move near the cabinet body, they are prone to accidentally contact the protruding base, which not only affects the convenience of daily operations but also may pose safety hazards. At the same time, since the base needs to bear the weight of the door panel and various forces generated by the operation of the hinge, it is required that the side plate of the cabinet body must have a considerable load-bearing capacity. Therefore, during the design process, it is necessary to carefully evaluate elements such as the material properties, structural dimensions, and fixing methods of the side plate to ensure the reliability and stability of the protruding base in actual use. Summary of the Invention

[0005] The purpose of the present invention is to overcome a series of problems caused by the base unit of the existing cabinet door connection device protruding from the side wall of the cabinet body, and to provide a cabinet door connection device.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] Cabinet door connection device, including a base unit, a hinge cup and a transmission rod system. The base unit is connected to the hinge cup through the transmission rod system. The transmission rod system includes a swing arm mechanism and a buffer device. The swing arm mechanism includes a first swing arm and a second swing arm. One end of the first swing arm and the second swing arm is a fixed end, and the other end is a swing end. The fixed end is provided with a first connection fulcrum connected to the base unit, and the swing end is provided with a second connection fulcrum connected to the hinge cup. A third connection fulcrum is also provided on the second swing arm. The first swing arm and the second swing arm form a four-bar linkage mechanism through the first connection fulcrum and the second connection fulcrum. The two fixed ends are distributed front and back and are close to being flush in height. The overall shape of the second swing arm is designed as a low-curvature circular arc. One side of the first swing arm close to the swing end is provided with a positioning corner that bends downward and backward. The shape of the positioning corner is adapted to the swing end of the second swing arm. The buffer device is horizontally placed at the rear of the swing arm mechanism and is connected to the third connection fulcrum through a transmission arm.

[0008] The cabinet door connection device of the present invention 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, and the swing end of the second swing arm is located within the positioning corner. 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 rod system of the present invention is installed on the cabinet door connection device. During assembly, the transmission rod system needs to be rotated 90 degrees as a whole with the cabinet door connection device and then fixed to the side plate of the storage cabinet. Since the two fixed ends are distributed front and back and are close to being flush in height, the height difference is small, and the buffer device is horizontally placed, which can save vertical space, enable the base to be compressed downward, and make the overall shape flat and thin, thereby reducing protrusion. In addition, one side of the first swing arm close to the swing end is provided with a positioning corner that bends downward and backward. 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°. The geometric adaptation design of the positioning corner and the swing end of the second swing arm enables the door to reach a hard mechanical limit when fully opened. It should be noted that in practical applications, the two fixed ends (31a, 32a) are distributed front and back and the height difference does not exceed 2 mm.

[0009] Furthermore, 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, and are connected to the rear side of the swing mechanism through the transmission arm. In this solution, components such as the buffer cylinder and the slider are horizontally arranged to form a compact horizontal transmission solution, significantly reducing the overall height of the hinge, making the side wall of the cabinet more flat and beautiful, and at the same time avoiding the problem of easy collision of traditional protruding hinges. This design optimizes the connection method between the transmission arm and the swing mechanism, enabling the buffer force to be evenly transmitted in the horizontal direction, not only improving the stability and smoothness of the door opening and closing, but also enhancing the load-bearing capacity of the structure, especially suitable for heavy doors. In addition, the horizontally arranged buffer device makes the force distribution more reasonable, reduces component wear, and extends the service life. Its flattened structure also simplifies the installation process, improves the adaptability, and can be widely used in modern minimalist furniture and various customized scenarios, maximizing the space utilization while ensuring performance.

[0010] Furthermore, the base unit includes a base body, a connecting arm, and an outer cover. The base body is provided with a base accommodating portion and an installation structure. The base body is fixedly connected to the cabinet through the installation structure. The connecting arm is slidably assembled on the base accommodating portion. The transmission rod system is arranged on the connecting arm. The connecting arm is connected to the hinge cup through the swing arm mechanism. The outer cover is arranged on the base body.

[0011] Furthermore, the base accommodating portion is formed by the depression of the base body, and the front end of the base accommodating portion is open. The connecting arm includes a accommodating portion and a swing arm connecting portion. The accommodating portion is designed as a U-shaped structure adapted to the base accommodating portion, and a hinge arm accommodating groove is formed inside it. The buffer device is arranged in the hinge arm accommodating groove. The swing arm connecting portion is connected to the front end of the accommodating portion and is used for connecting the swing arm mechanism. In this solution, the base accommodating portion is formed by the depression of the base, and its opening is located at the upper end and the front end. In this way, a groove adapted to the base accommodating portion can be preset on the side wall of the cabinet, which can further reduce the height of the cabinet door connecting device protruding from the base. In this solution, the opening of the base accommodating portion is located at the upper end and the front end. This design enables the side wall of the cabinet to preset a groove adapted to the base accommodating portion. Placing the base accommodating portion in the groove further reduces the height of the cabinet door connecting device protruding from the base. At the same time, the nested structure of the U-shaped hinge arm accommodating groove of the connecting arm and the base accommodating portion can disperse the door weight to the groove on the side wall of the cabinet, reducing local stress concentration.

[0012] Further, it further includes a driving mechanism, the driving mechanism is arranged on the connecting arm, the buffer device further includes 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, and its side is abutted against the driving part of the driving mechanism. After receiving the backward pressure, the whole buffer device moves backward and triggers the driving mechanism, so that the driving mechanism provides a backward driving force for the buffer device. This solution adds a driving mechanism to cooperate with the buffer device. When the buffer device receives backward pressure, the driving mechanism provides a backward driving force for it, realizing automatic buffering and driving during the closing process of the door body, and reducing the force of manual operation by the user. Especially when the door body is close to closing, the two cooperate to automatically complete the closing action, and the user only needs to gently push the door body.

[0013] Further, 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 assembled on the mounting shaft, and the other end is provided with an elastic member and is telescopically connected to the first positioning groove. The bottom of the V-shaped rocker mechanism is the driving part. The slider is provided with a pressure-bearing groove adapted to the driving part. The driving part abuts against the rear part of the side wall of the slider, and the pressure-bearing groove is located in front 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 member is applied to the rear side wall of the pressure-bearing groove through the driving part. In this solution, when the cabinet door connecting device 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 member is released and drives the V-shaped rocker mechanism to swing backward, so that the driving part moves backward and abuts against the rear side wall of the pressure-bearing groove, and 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 cabinet door connecting device switches from the closed state to the open state, the slider moves forward, the pressure-bearing groove is separated from the driving part, and at the same time, the rear part of the side wall of the slider remains in contact with the driving part. Under the action of the friction force between the two, the V-shaped rocker mechanism swings forward and compresses the elastic member to complete the switching of the open state. Through the design of this solution, the cooperation between the driving mechanism and the slider realizes the automatic driving and buffering functions of the cabinet door connecting device during the switching process between the open and closed states, improving the fluency and stability of the operation.

[0014] Further, the driving mechanism includes an elastic member, a first driving rod, and a second driving rod. One of the left and right sides of the hinge arm receiving cavity is a driving installation area, and the other side is a buffer installation area. The front part of the driving installation area is provided with an inclined elastic installation part, and the elastic installation part is provided with a first positioning groove. The middle part of the driving installation area is provided with a mounting shaft. One end of the first driving rod and the second driving rod are hinged to form the above-mentioned V-shaped rocker mechanism, and both ends of the V-shaped rocker mechanism are respectively assembled on the mounting shaft and the first positioning groove. The bottom of the V-shaped rocker mechanism is its driving part, and the elastic member is sleeved on the second driving rod; the slider is provided with a pressure-bearing groove adapted to the driving part, the driving part abuts against the rear side wall of the slider, and the pressure-bearing groove is located on the front side of the driving part. When the slider moves backward, the driving part slides into the pressure-bearing groove, and the elastic force of the elastic member is applied to the rear side wall of the pressure-bearing groove through the driving part to drive it to move backward.

[0015] Further, a concave position is provided at the front end of the slider, and a connecting shaft is provided at the concave position. One end of the transmission arm is sleeved on the connecting shaft.

[0016] Further, the base unit further includes a support frame, the support frame is provided on the lower side of the base body, the outer side of the base body radially protrudes from the support frame to form a connecting concave position, and the side edge of the outer cover is provided with a buckling part, and the buckling part is buckled on the connecting concave position.

[0017] Further, one end of the transmission arm is provided with an open semi-circular hole, and the transmission arm is connected to the buffer device through the open semi-circular hole.

[0018] Further, the third connection fulcrum of the second swing arm is arranged on the side close to the fixed end. In this solution, the third connection fulcrum is close to the fixed end, and the force arm length of the transmission arm is shorter, which directly affects the space requirement in the vertical direction, significantly reduces the movement range of the swing arm in the vertical direction, and thus reduces the overall height of the hinge. At the same time, since the third connection fulcrum is closer to the fixed end, a greater angular acceleration is obtained at the initial stage of the door opening. When approaching the 120° fully open position, the angular velocity naturally decays due to the change of the torque ratio, and the positioning corner is cooperated to achieve smooth mechanical limit.

[0019] Further, a linear limit guiding structure is provided between the connecting arm and the base body. In this solution, the linear limit guiding structure ensures the sliding accuracy and avoids the mechanism jamming caused by lateral deviation. Further, the linear limit guiding structure includes a first guiding mechanism and a second guiding mechanism.

[0020] Further, a buffer installation part is provided at the rear part of the hinge arm receiving groove, and a second positioning groove is provided on the buffer installation part. The rod body of the buffer rod is assembled on the second positioning groove.

[0021] Further, the fixed ends and the swinging ends of the first swing arm and the second swing arm are shaft-shaped. The fixed end and the swinging end of the first swing arm are connected by a first connecting rib, and the fixed end and the swinging end of the second swing arm are connected by a second connecting rib. The first connecting rib includes a first arm section connected to the fixed end and a second arm section connected to the swinging end. The front end of the first arm section is connected to the upper end of the second arm section and forms a positioning corner. The second connecting rib includes a third arm section connected to the fixed end and a fourth arm section connected to the swinging end. The rear end of the third arm section is connected to the fourth arm section. Connecting ears are provided on both sides of the lower end of the third arm section. The third connecting fulcrum is a round hole provided on the connecting ear.

[0022] Further, the shape of the positioning corner is adapted to the swinging end of the second swing arm, and the sum of the lengths of the fourth arm section and the swinging end of the second swing arm is equal to the length of the second arm section. In this solution, the geometric adaptation design of the positioning corner and the swinging end of the second swing arm enables the door body to reach a hard mechanical limit when it is fully opened.

[0023] Further, the second swing arm is provided with a positioning arc surface. The positioning arc surface is provided on the side close to the swinging end and on the side adjacent to the first swing arm. When the cabinet door connecting device is in the closed state, the first swing arm is located close to the second swing arm.

[0024] Further, the shapes of the first arm section, the second arm section and the fourth arm section are adapted to each other.

[0025] Further, the length of the third arm section is less than the length of the fourth arm section, so that the third connecting fulcrum is an eccentric design. In practical applications, this eccentric design needs to be optimized in coordination with the geometric parameters of the positioning corner. Generally, when the length ratio of the third arm section to the fourth arm section is 3:4, both the structural strength can be ensured and the optimal dynamic performance balance can be achieved.

[0026] Another object of the present invention is to provide a storage cabinet, including a cabinet body, a door body and the cabinet door connecting device of the above solution. The cabinet body and the door body are connected by the cabinet door connecting device. Description of the Drawings

[0027] Figure 1 Schematic structure of the drive rod system in the closed state Figure 1 ;

[0028] Figure 2 Schematic structure of the drive rod system in the closed state Figure 2 ;

[0029] Figure 3 Schematic structure of the drive rod system in the closed state Figure 3 ;

[0030] Figure 4Structural schematic of the transmission rod system in the closed state Figure 4 ;

[0031] Figure 5 Assembly of the slider and swing arm mechanism in the open state Figure 1 。

[0032] Figure 6 Assembly of the slider and swing arm mechanism in the open state Figure 2 。

[0033] Figure 7 Structural schematic diagram of the cabinet door connection device in the open state.

[0034] Figure 8 Structural exploded view of the cabinet door connection device in the closed state.

[0035] Figure 9 Structural schematic of the connecting arm Figure 1 。

[0036] Figure 10 Structural schematic of the connecting arm Figure 2 。

[0037] Figure 11 Assembly drawing of the buffer device and the drive mechanism in the open state;

[0038] Figure 12 Structural exploded view of the base and the connecting arm;

[0039] Figure 13 Schematic diagram of the cabinet door connection device in the closed state;

[0040] Figure 14 Structural schematic diagram of the cabinet door connection device in the closed state;

[0041] Figure 15 Structural schematic diagram of the cabinet door connection device in the closed state (outer cover not shown);

[0042] Figure 16 Structural schematic diagram of the storage cabinet in the open state.

[0043] Figure 17 Structural schematic diagram of the first swing rod;

[0044] Figure 18 Schematic diagram of the cabinet door connection device in the open state;

[0045] Figure 19 Structural schematic of the second swing rod Figure 1 ;

[0046] Figure 20 Structural schematic of the second swing rod Figure 2 ;

[0047] Figure 21 Structural decomposition of the slider Figure 1 ;

[0048] Figure 22 Structural decomposition of the slider Figure 1 。

[0049] Label description:

[0050] Cabinet door connection device 1, hinge cup 11, transmission rod system 2, swing arm mechanism 3, first swing arm 31, first connecting rib 311, first section arm 312, second section arm 313, positioning corner 314, second swing arm 32, second connecting rib 321, third section arm 322, fourth section arm 323, positioning arc surface 324, fixed end (31a, 32a), swing end (31b, 32b), connecting ear 325, buffer device 4, slider 41, concave position 43, connecting shaft 44, sliding block 45, first connecting wall 451, pressure-bearing groove 451a, second connecting wall 452, hinge shaft hole 452a, third connecting wall 453, fourth connecting wall 454, housing 46, transmission arm 47, buffer cylinder 48, base unit 5, base body 50, mounting structure 51, outward flange 511, clearance opening 52, third mounting hole 512, base accommodating part 53, connecting arm 6, accommodating part 61, swing arm connecting part 62, hinge arm accommodating 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, guiding groove 631, guiding hole 632, guiding shaft nail 633, connecting rod 641, limiting hole 642, drive mechanism 7, elastic member 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, cabinet body 101, cabinet door 102. Detailed implementation manners

[0051] The following describes the detailed implementation manners of the present invention with reference to the accompanying drawings. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0052] As shown in FIGS. 1-22, the present invention discloses a cabinet door connecting device 1, which includes a base unit 5, a hinge cup 11 and a transmission rod system. The base unit 5 is connected to the hinge cup 11 through the transmission rod system. The transmission rod system includes a swing arm mechanism 3 and a buffer device 4. The swing arm 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 connection fulcrum connected to the base unit 5, and the swing end [31b, 32b] is provided with a second connection fulcrum connected to the hinge cup 11. The second swing arm 32 is further provided with a third connection fulcrum. The first swing arm 31 and the second swing arm 32 form a four-bar linkage through the first connection fulcrum and the second connection fulcrum. The two fixed ends [31a, 32a] are distributed front and back and are close to being flush in height. The overall shape of the second swing arm 32 is designed as a low-curvature circular arc. On one side of the first swing arm 31 near the swing end 31b, there is a positioning corner 314 that bends downward and backward, and the shape of the positioning corner 314 is adapted to the swing end 32b of the second swing arm 32. The buffer device 4 is horizontally arranged at the rear side of the swing arm mechanism 3, and the buffer device 4 is connected to the third connection fulcrum through a transmission arm 47 provided.

[0053] The above 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.

[0054] The above base unit 5 includes a base body 50, a connecting arm 6 and an outer cover 9. The base body 50 is provided with a base accommodating portion 53 and an installation structure 51. The base body 50 is fixedly connected to the cabinet through the installation structure 51. The connecting arm 6 is slidably assembled on the base accommodating portion 53. The transmission rod system 2 is arranged on the connecting arm 6. The connecting arm 6 is connected to the hinge cup 11 through the swing arm mechanism 3. The outer cover 9 is arranged on the base body 50.

[0055] The above base accommodating portion 53 is formed by the depression of the base body 50, and the front end of the base accommodating portion 53 is open. The connecting arm 6 includes a accommodating portion 61 and a swing arm connecting portion 62. The accommodating portion 61 is designed as a U-shaped structure adapted to the base accommodating portion 53, and a hinge arm accommodating groove 613 is formed inside it. The buffer device 4 is arranged in the hinge arm accommodating groove 613. The swing arm connecting portion 62 is connected to the front end of the accommodating portion 61 and is used for connecting the swing arm mechanism 3.

[0056] The above-mentioned base unit 5 further includes a driving mechanism 7, the driving mechanism 7 is arranged on the connecting arm 6, the buffer device 4 further includes a buffer cylinder 48 and a slider 41, the front and rear ends of the slider 41 are respectively connected to a transmission arm 47 and the buffer cylinder 48, and the side portion thereof abuts against the driving portion of the driving mechanism 7. After receiving a backward pressure, the buffer device 4 moves backward as a whole and triggers the driving mechanism 7, so that the driving mechanism 7 provides a driving force for the backward movement of the buffer device 4.

[0057] The above-mentioned buffer cylinder 48 is a hydraulic buffer cylinder.

[0058] The above-mentioned driving mechanism 7 includes an elastic member 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 installation area 611 and a buffer installation area 612. An inclined elastic installation portion 616 is provided at the front of the driving installation area 611. A first positioning groove 615 is provided on the elastic installation portion 616. A mounting shaft 614 is provided in the middle of the driving installation area 611. One ends of the first driving rod 72 and the second driving rod 73 are hinged to form a V-shaped rocker mechanism 74, and the bottom of the link mechanism 74 is its driving portion. The elastic member 71 is sleeved on the second driving rod 73; the slider 41 is provided with a pressure-bearing groove 451a adapted to the driving portion, the driving portion abuts against the rear side wall of the slider 41, and the pressure-bearing groove 451a is located on the front side of the driving portion.

[0059] A concave position 43 is provided at the front end of the above-mentioned slider 41, and a connecting shaft 44 is provided at the concave position 43. One end of the transmission arm 47 is sleeved on the connecting shaft 44.

[0060] See Figures 21-22 As shown, the above-mentioned slider includes a reinforcing block 45 and a housing 46. The pressure-bearing groove 451a, the concave position 43 and the sliding plane are arranged on the housing 46. The reinforcing block is embedded in the housing 46. The housing 46 is provided with an embedding groove in cooperation with the reinforcing block. The housing 46 is made of plastic material. In this solution, the housing 46 is made of plastic material and is provided with an embedding groove in cooperation with the reinforcing block, so that the two are closely combined. The plastic material has a low friction coefficient. During the sliding process of the slider, it can reduce the frictional resistance between the slider and the connecting arm 6 and the driving mechanism 7, reduce noise and energy loss, make the movement of the slider smoother, and improve the transmission efficiency. That is, while ensuring the overall strength of the slider 41, a plastic-metal friction pair is formed between the slider 41 and the metal slideway of the connecting arm 6 to reduce the friction coefficient and noise; a metal-plastic friction pair is formed between the metal driving portion of the driving mechanism 7 and the plastic contact surface of the slider 41 to further reduce noise.

[0061] The above-mentioned reinforcing block is a precision metal casting. In this solution, the reinforcing block is made of precision metal casting, which has high strength and can withstand large acting forces and stresses, ensuring the structural stability of the slider during reciprocating motion, and is not prone to deformation or damage, thereby improving the reliability and service life of the entire hinge transmission component.

[0062] The above-mentioned reinforcing block includes a third connecting wall 453. At the rear end of the outer shell 46, a third installation groove 463 is provided in cooperation with the third connecting wall 453. The third connecting wall 453 is fitted into the third installation groove 463 and serves as the buffer connection end. In this solution, the slider is reliably connected to the buffer through the high-strength and high-stability reinforcing block 45. This connection method greatly enhances the overall structural stability of the slider 41, enabling it to maintain the integrity and stability of the structure when subjected to complex external forces, such as the reciprocating impact force during hinge transmission and the reaction force of the buffer 48, effectively preventing structural deformation or damage caused by local stress concentration.

[0063] The above-mentioned reinforcing block includes a first connecting wall 451, a second connecting wall 452, and a fourth connecting wall 454. The lower ends of the second connecting wall 452 and the fourth connecting wall are respectively connected to one side of the front end of the first connecting wall 451, and corresponding hinge shaft holes are provided. The lower end of the third connecting wall 453 is connected to the rear end of the first connecting wall 451. The outer shell 46 is provided with a first installation groove 461, a second installation groove 462, and a fourth installation groove 464 in cooperation with the first connecting wall 451, the second connecting wall 452, and the fourth connecting wall. The second installation groove 462 is located on one side of the concave position 43.

[0064] The above-mentioned base unit 5 further includes a support frame 8. The support frame 8 is provided on the lower side of the base body 50. The outer side of the base body 50 protrudes radially beyond the support frame 8 to form a connecting concave position. The side edge of the outer cover is provided with a fastening portion, and the fastening portion is fastened to the connecting concave position to connect the base body 50 and the outer cover.

[0065] The above-mentioned support frame 8 includes two relatively arranged 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 installation hole 83 and a second installation hole 84 for connecting to the cabinet body. The installation structure 51 includes an outward-turned edge 511 provided along the two side edges of the base accommodation portion 53. The outward-turned edge 511 abuts against the first support portion 81. A clearance opening 52 is provided in the middle of the base accommodation portion 53 in cooperation with the middle of the second support portion 82. A third installation hole 512 is provided on the outward-turned edge 511, and the first installation hole 83 and the third installation hole 512 are connected in series by screws in the middle of the base body 50.

[0066] One end of the above-mentioned transmission arm 47 is provided with a third hinge fulcrum, which is connected to the third connection fulcrum by a connecting shaft 44. The other end is provided with an open semi-circular hole, and the transmission arm 47 is assembled at the front end of the buffer device 4 through the open semi-circular hole.

[0067] A linear limit guiding structure is provided between the above-mentioned connecting arm 6 and the base body 50, including a first guiding mechanism and a second guiding mechanism. The first guiding mechanism is arranged at the front part of the connecting arm 6 and the base body 50, and includes a guiding groove 631, a guiding hole 632 and a guiding shaft nail 633. The guiding groove 631 is arranged on the base body 50 along the length direction, the guiding hole 632 is arranged on the connecting arm 6, and the two are connected by the guiding shaft nail 633. The second guiding mechanism is arranged at the rear side of the connecting arm 6 and the base body 50, and includes a connecting rod 641 and a limiting hole 642. The limiting holes 642 are arranged on the opposite sides of the base body 50, and through holes are arranged on both sides of the connecting arm 6 to cooperate with the connecting rod 641, and the connecting rod 641 is horizontally assembled on the connecting arm 6 through the holes.

[0068] A buffer installation part 617 is arranged at the rear part of the above-mentioned hinge arm accommodating groove 613, and a second positioning groove is arranged on the buffer installation part 617, and the rod body of the buffer rod is assembled on the second positioning groove.

[0069] The fixed ends (31a, 32a) and the swinging ends (31b, 32b) of the above-mentioned first swing arm 31 and second swing arm 32 are in a shaft shape. The fixed end 31a and the swinging end 31b of the first swing arm 31 are connected by a first connecting rib 311, and the fixed end 32a and the swinging end 32b of the second swing arm 32 are connected by a second connecting rib 321. The first connecting rib 311 includes a first section arm 312 connected to the fixed end 31a and a second section arm 313 connected to the swinging end 31b. The front end of the first section arm 312 is connected to the upper end of the second section arm 313 to form a positioning corner 314. The second connecting rib 321 includes a third section arm 322 connected to the fixed end 32a and a fourth section arm 323 connected to the swinging end 32b. The third section arm 322 is connected to the rear end of the fourth section arm 323. Connecting ears 325 are arranged on both sides of the lower end of the third section arm 322, and the third connection fulcrum is a circular hole arranged on the connecting ears 325.

[0070] The shapes of the above-mentioned first section arm 312, second section arm 313 and fourth section arm 323 are adapted to each other. The shape of the above-mentioned positioning corner 314 is adapted to the swinging end 32b of the second swing arm 32, and the sum of the lengths of the fourth section arm 323 and the swinging end 32b of the second swing arm 32 is equal to the length of the second section arm 313. The length of the third section arm 322 is less than the length of the fourth section arm 323, so that the third connection fulcrum is eccentrically designed.

[0071] The second swing arm 32 is provided with a positioning arc surface 324, which is arranged on the side close to the swing end 32b and on the side adjacent to the first swing arm 31. When the cabinet door connecting device 1 is in the closed state, the first swing arm 31 is located close to the second swing arm 32.

[0072] See Figure 19 As shown, the included angle between the fixed end 32a and the swing end 32b of the second swing arm 32 is 5°, so that its overall shape is a low-curvature circular arc.

[0073] See Figures 17-18 As shown, the above-mentioned positioning corner (314) is 100 - 120°, preferably 115°, and there is an included angle of 175° between the accommodating part 61 and the upper end of the swing rod connecting part 62.

[0074] See Figure 20 As shown, the connecting ear is offset and arranged on the side of the second swing rod close to the middle of the connecting arm.

[0075] The transmission rod system 2 of the present invention is installed on the cabinet door connecting device 1. During assembly, the transmission rod system 2 needs to be rotated 90 degrees together with the cabinet door connecting device 1 and then fixed to the side plate of the storage cabinet. Since the two fixed ends [31a, 32a] are distributed front and back and the heights are close to being flush, the height difference is small, and the buffer device 4 is placed horizontally, which can save vertical space, enable the base unit 5 to be compressed downward, and the overall shape is flattened and thin, thereby reducing protrusion. A positioning corner 314 that is downward and backward is provided on the side of the first swing arm 31 close to the swing end 31b. Through the geometric design of the positioning corner 314, a larger door opening angle can be achieved within a limited swing space, and the door opening angle can reach 120°.

[0076] See Figure 16 As shown, the present invention also discloses a storage cabinet, including a cabinet body, a door body, and the cabinet door connecting device of the above solution, and the cabinet body and the door body are connected through the cabinet door connecting device.

[0077] According to the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A cabinet door connection device (1), characterized in that, Comprising a base unit (5), a hinge cup (11) and a transmission rod system, the base unit (5) is connected to the hinge cup (11) through the transmission rod system, and is characterized in that: the transmission rod system includes a swing arm mechanism (3) and a buffer device (4), the swing arm 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 connection fulcrum connected to the base unit (5), the swing end (31b, 32b) is provided with a second connection fulcrum connected to the hinge cup (11), and the second swing arm (32) is further provided with a third connection fulcrum. The first swing arm (31) and the second swing arm (32) form a four-bar linkage through the first connection fulcrum and the second connection fulcrum. The two fixed ends (31a, 32a) are distributed front and back and are close to being flush in height. The overall shape of the second swing arm (32) is designed as a low-curvature circular arc. One side of the first swing arm (31) near the swing end (31b) is provided with a positioning corner (314) bent downward and backward, and the shape of the positioning corner (314) is adapted to the swing end (32b) of the second swing arm (32). The buffer device (4) is horizontally arranged at the rear side of the swing arm mechanism (3) and is connected to the third connection fulcrum (3).

2. The cabinet door connection device according to claim 1, characterized in that: 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), and are connected to the rear side of the swing mechanism through the transmission arm (47).

3. The cabinet door connection device according to claim 1, wherein: The base unit (5) includes a base body (50) and a connecting arm (6). The base body (50) is provided with a base accommodating 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 assembled on the base accommodating portion (53). The transmission rod system (2) is arranged on the connecting arm (6). The connecting arm (6) is connected to the hinge cup (11) through the swing arm mechanism (3). The outer cover (9) is arranged on the base body (50).

4. The cabinet door connection device according to claim 3, characterized in that, The base accommodating portion (53) is formed by the base body (50) being recessed, and the front end of the base accommodating portion (53) is open. The connecting arm (6) includes a accommodating portion (61) and a swing arm connecting portion (62). The accommodating portion (61) is designed as a U-shaped structure adapted to the base accommodating portion (53), and a hinge arm accommodating groove (613) is formed inside. The buffer device (4) is arranged in the hinge arm accommodating groove (613). The swing arm connecting portion (62) is connected to the front end of the accommodating portion (61) and is used for connecting the swing arm mechanism (3).

5. The cabinet door connecting device according to claim 3, characterized in that, It further includes a driving mechanism (7), the driving mechanism (7) is arranged on the connecting arm (6), the buffer device (4) includes a 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), and its side is abutted against the driving part of the driving mechanism (7). After receiving a backward pressure, the buffer device (4) moves backward as a whole and triggers the driving mechanism (7), so that the driving mechanism (7) provides a driving force for the backward movement of the buffer device (4).

6. The cabinet door connection device according to claim 5, characterized in that, The driving mechanism (7) includes a V-shaped rocker mechanism (74). A first positioning groove (615) and a mounting shaft (614) are arranged on the connecting arm. One end of the V-shaped rocker mechanism (74) is rotatably assembled on the mounting shaft (614), and the other end is provided with an elastic member (71) and is telescopically connected to the first positioning groove (615). The bottom of the V-shaped rocker mechanism (74) is the driving part. The slider (41) is provided with a pressure-bearing groove (451a) adapted to the driving part. The driving part abuts against the rear part of the side wall of the slider (41), and the pressure-bearing groove (451a) is located on the front side of its driving part. When the slider (41) moves backward, the driving part slides into the pressure-bearing groove (451a), and the elastic force of the elastic member (71) is applied to the rear side wall of the pressure-bearing groove (451a) through the driving part.

7. The cabinet door connection device according to claim 5, characterized in that, A recess (43) is provided at the front end of the slider (41), a connecting shaft (44) is provided at the recess (43), one end of the transmission arm (47) is provided with an open semi-circular hole, and the transmission arm (47) is connected to the connecting shaft (44) through the open semi-circular hole.

8. The cabinet door connection device according to claim 2 and the outer cover (9), characterized in that, The base unit (5) further includes a support frame (8), the support frame (8) is arranged on the lower side of the base body (50), and the outer side of the base body (50) protrudes radially outwards from the support frame (8) to form a connecting recess. A fastening portion is provided on the side edge of the outer cover (9), and the fastening portion is fastened to the connecting recess.

9. The cabinet door connecting device according to claim 1, characterized in that, The third connection fulcrum of the second swing arm is arranged on the side close to the fixed end thereof.

10. A storage cabinet, characterized in that, It includes a cabinet body, a door body and the cabinet door connecting device (1) according to any one of claims 1-9, and the cabinet body and the door body are connected through the cabinet door connecting device (1).

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