Hidden hinge structure

Abstract

The invention discloses a hidden hinge structure which comprises a fixed seat arranged on a side plate of a cabinet body, a movable seat arranged on a door plate and a hinge arm, the side plate of the cabinet body and the door plate respectively form a first mounting groove and a second mounting groove, and the fixed seat and the movable seat are respectively arranged in the first mounting groove and the second mounting groove. The fixed seat is sunken outwards from the inner wall to form a movable groove; the hinged arm comprises an arm body, a first bent arm and a second bent arm. On one hand, based on the layout of the fixed seat and the movable seat on the side plate and the door plate of the cabinet body, the two ends of the hinge arm are bent to be connected with the fixed seat and the movable seat respectively, so that hinge hiding is achieved, and the use attractiveness is effectively improved; on the other hand, when the door plate is opened, the door plate and the hinge arm are ensured to be flush with or staggered from the inner wall of the side plate of the cabinet body through the limiting of the limiting part, so that the opening of the cabinet body is prevented from being shielded, the maximum utilization rate of the opening space of the cabinet body is realized, and the user experience is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of hinges, and in particular relates to a hidden hinge structure. Background Art

[0002] A hinge is a mechanical device used to connect two solid bodies and allow them to rotate relative to each other.

[0003] At present, there are various types of hinges on the market, which are widely used in furniture and electrical appliances. A Chinese patent with a publication number of CN110952853B discloses a large-angle opening and closing self-locking hinge, including a door panel fixing seat fixed on a door body and a cabinet fixing seat fixed on a cabinet body, and also includes a rocker arm, an axle spring seat connecting rod, a bushing spring seat connecting rod, a force arm and a self-locking spring assembly, wherein the cabinet fixing seat is hinged to one end of the rocker arm through a first hinge shaft, the other end of the rocker arm is hinged to one end of the axle spring seat connecting rod through a second hinge shaft, the other end of the axle spring seat connecting rod is hinged to one end of the door panel fixing seat through a third hinge shaft, and the other end of the door panel fixing seat is hinged to one end of the bushing spring seat connecting rod through a fourth hinge shaft.

[0004] However, in actual use, the prior art is prone to the following defects:

[0005] 1. Due to the structural limitations of existing hinges, in addition to the obstruction of the cabinet opening space by the hinges, when the door panel is opened, for example, when the door panel is opened 90° or more, the side connected to the hinge will inevitably shift inward, and the door panel will inevitably block the cabinet opening space, thereby reducing the width of the cabinet opening that can accommodate items, affecting the user experience;

[0006] 2. When opening or closing, the hinge always protrudes from the door panel or cabinet surface and cannot be hidden in the cabinet or door, affecting the aesthetics. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an improved hidden hinge structure.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0009] A hidden hinge structure, which includes a fixed seat arranged on a cabinet side panel, a movable seat arranged on a door panel, and an articulated arm. The cabinet side panel and the door panel are respectively recessed outward from the inner wall to form a first mounting groove and a second mounting groove. The fixed seat and the movable seat are respectively built into the first mounting groove and the second mounting groove, and the fixed seat is recessed outward from the inner wall to form a movable groove, wherein a limiting portion is formed in the movable groove; the articulated arm includes an arm body, a first bent arm and a second bent arm respectively bent outward from both ends of the arm body, wherein the first bent arm is connected in the movable groove by pivot rotation and cooperates with the limiting portion, and the second bent arm is fixedly connected to the movable seat, as the door panel closes, the first bent arm rotates around the pivot center line and disengages from the limiting portion; as the door panel opens, the first bent arm rotates around the pivot center line and abuts against the limiting portion, and the door panel and the arm body are flush with the inner wall of the cabinet side panel and / or offset outward.

[0010] According to a specific implementation and preferred aspect of the present invention, the inner wall surfaces of the fixed seat and the movable seat are respectively arranged flush with the inner walls of the cabinet side panels and the door panels, thereby achieving the flatness of the cabinet side panels and the door panels, preventing foreign objects from getting stuck in the hinges, and improving the aesthetics.

[0011] According to another specific implementation and preferred aspect of the present invention, a first notch connected to the first mounting groove is formed on one side of the cabinet side panel close to the door panel, a second notch connected to the second mounting groove is formed on one side of the door panel close to the cabinet side panel, and both ends of the arm body pass through the first notch and the second notch respectively. This facilitates the installation and layout of the articulated arm, avoids interference with the door panel or the cabinet side panel during the opening and closing of the door panel, and facilitates the hiding of the articulated arm when the door panel is closed.

[0012] Preferably, the depths of the first notch and the second notch are both greater than or equal to the thickness of the arm body.

[0013] According to another specific implementation and preferred aspect of the present invention, the limiting part is formed at the bottom of the movable groove and is arranged close to the pivot; a rotating module capable of rotating around the center line of the pivot is fixedly provided at one end of the first bending arm away from the arm body, wherein a protrusion is formed on the rotating module, and as the door panel is opened or closed, the rotating module rotates around the center line of the pivot and drives the protrusion to contact or disengage from the limiting part; the opening and closing angle of the door panel and the angle of rotation of the protrusion around the center line of the pivot are equal, both of which are 0° to 96°. Here, based on the door panel and the protrusion rotating at the same angle, the opening and closing of the door panel is precisely controlled; at the same time, the structure is simple and easy to implement.

[0014] Preferably, the rotating module includes a first mold body and a second mold body, wherein the first mold body is sleeved on the pivot, the second mold body and the protrusion are respectively integrally formed on the side wall of the first mold body, and the first bending arm is fixedly connected to the second mold body from the corresponding end. In some specific embodiments, two connecting shafts arranged side by side and parallel to the pivot are inserted on the second mold body, and the first bending arm is synchronously connected to the two connecting shafts to achieve fixation, which is convenient for disassembly and assembly, and has high connection strength, thereby enhancing the stability of the connection structure.

[0015] Further preferably, the rotating module also includes a third mold body integrally formed on the side wall of the first mold body; the hinge also includes an elastic member installed on the fixed seat, the elastic member abuts against the third mold body and forms a force to drive the door panel to move to a closed state or forms a resistance to hinder the opening and closing of the door panel.

[0016] Specifically, the elastic member adopts a torsion spring having a first torsion arm and a second torsion arm, wherein the first torsion arm abuts against the fixed seat; a first contact surface and a second contact surface arranged to intersect are formed on the third mold body, defining a boundary angle θ, when the door panel opens from a closed state at an angle less than or equal to θ, the second torsion arm abuts against the first contact surface and drives the door panel to maintain a trend of moving toward a closed state; when the door panel opens from a closed state at an angle greater than θ, the second torsion arm moves and abuts against the second contact surface and forms a resistance that prevents the door panel from rotating around the center line of the pivot. Here, through the cooperation of the torsion spring and the first contact surface and the second contact surface, when the opening angle of the door panel is less than or equal to θ, the elastic force of the second torsion arm contacts the first contact surface and pushes the first mold body to rotate around the pivot, thereby driving the door panel to move to a closed state to achieve automatic closing; at the same time, when the opening angle of the door panel is greater than θ, the first mold body drives the third mold body to rotate to switch to the second contact surface and contact the second torsion arm to form a resistance that hinders the door panel from rotating around the center line of the pivot, so that the door panel can be maintained at any opening angle without external force after being opened, thereby facilitating user use.

[0017] Preferably, 15°≤θ≤30°; and / or, the first contact surface is a plane, and when the door panel opens from a closed state at an angle less than or equal to θ, as the door panel closes, the second torsion arm gradually becomes parallel to and fits or remains intersecting with the first contact surface; and / or, the second contact surface is an arc-shaped surface arched toward the second torsion arm, and when the door panel opens from a closed state at an angle greater than θ, as the door panel opens, the second torsion arm remains tangent to the second contact surface and forms an elastic force along the radial direction of the pivot.

[0018] In addition, the hinge further comprises a damper mounted on the fixed seat, wherein the telescopic end of the damper extends into the movable groove, and as the door panel closes, the arm body gradually contacts the telescopic end of the damper, and the damper simultaneously forms a damping to slow down the closing movement trend of the door panel; and / or, when the door panel is closed, the arm body is hidden in the movable groove. Here, as the door panel closes, the damper achieves a buffering effect on the arm body, so that the door panel can be closed slowly. Conversely, when the door panel is opened from the closed state, the damper provides auxiliary thrust, thereby effectively improving the opening and closing texture of the door panel and improving the user experience.

[0019] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] The structural limitations of the hinges in the prior art are that, in addition to the obstruction of the cabinet opening space by the hinges, when the door panel is opened, for example, when the door panel is opened 90° or more, the side edge of the door panel connected to the hinge will inevitably deviate inward, and the door panel will inevitably obstruct the cabinet opening space, thereby reducing the width of the cabinet opening through which items can pass, affecting the user experience; when opening or closing, the hinge always protrudes from the door panel or the cabinet surface and cannot be hidden in the cabinet or the cabinet door, affecting the aesthetics; the present application designs the structure of the hidden hinge structure as a whole, cleverly solving the existing In order to overcome the technical deficiencies and defects, after adopting the hinge, the fixed seat and the movable seat are respectively embedded in the installation grooves on the cabinet side panel and the door panel, and the first bent arm bent outward at both ends of the arm body is rotatably connected to the movable groove formed on the fixed seat and cooperates with the limiting part, and the second bent arm is fixed on the movable seat. In this way, the hinge can be hidden, and as the door panel opens and closes, the first bent arm is separated from the limiting part to realize the opening and closing of the door panel, or the first bent arm is against the limiting part to ensure that the door panel and the arm body are flush with the inner wall of the cabinet side panel or / and positioned outward to avoid blocking the cabinet opening. Therefore, compared with the prior art, the present invention, on the one hand, realizes hiding of the hinges based on the layout of the fixed seat and the movable seat on the cabinet side panel and the door panel, and bending the two ends of the articulated arm to form a connection with the fixed seat and the movable seat respectively, thereby effectively improving the aesthetics of use; on the other hand, when the door panel is opened, the limiting part is used to ensure that the door panel and the articulated arm are flush with or misaligned with the inner wall of the cabinet side panel, thereby avoiding obstruction of the cabinet opening, that is, realizing the maximum utilization rate of the cabinet opening space, greatly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the hidden hinge structure of the present invention (closed state);

[0022] Figure 2 It is a front view schematic diagram of the hidden hinge structure of the present invention (closed state);

[0023] Figure 3 for Figure 2 A top view schematic diagram of

[0024] Figure 4 It is a front view schematic diagram of the hidden hinge structure of the present invention (open state);

[0025] Figure 5 for Figure 4 A top view schematic diagram of

[0026] Figure 6 for Figure 2 A half-section diagram of the first position;

[0027] Figure 7 for Figure 2 A half-section schematic diagram of the second position;

[0028] Figure 8 for Figure 4 A half-section diagram of

[0029] Fig. 9 It is a schematic diagram of the structural decomposition of the hidden hinge structure of the present invention;

[0030] Fig.10 for Fig. 9 A magnified schematic diagram of the three-dimensional structure of the rotating module from another perspective;

[0031] Wherein: B1, cabinet side panel; B2, door panel; c1, first installation slot; c2, second installation slot; k1, first notch; k2, second notch;

[0032] 1. Fixed seat; c3. Movable slot; a. Limiting part;

[0033] 2. Movable seat;

[0034] 3, articulated arm; 30, arm body; 31, first bending arm; s, pivot; m, rotation module; m1, first mold body; m2, second mold body; m20, connecting shaft; m3, third mold body; m31, first contact surface; m32, second contact surface; b, raised portion; 32, second bending arm;

[0035] 4. elastic member; 41. first torsion arm; 42. second torsion arm;

[0036] 5. Damper. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0038] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as limiting the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0043] like Figures 1 to 10 As shown, the hidden hinge structure involved in this embodiment includes a fixed seat 1 arranged on the cabinet side panel B1, a movable seat 2 arranged on the door panel B2, and a hinge arm 3.

[0044] In some specific embodiments, the cabinet side panel B1 and the door panel B2 are respectively recessed outward from the inner wall to form a first installation groove c1 and a second installation groove c2, and the fixed seat 1 and the movable seat 2 are respectively built into the first installation groove c1 and the second installation groove c2, wherein the inner wall surfaces of the fixed seat 1 and the movable seat 2 are respectively flush with the inner walls of the cabinet side panel B1 and the door panel B2. Here, the surface of the cabinet side panel and the door panel is made flat, foreign objects are prevented from getting stuck in the hinge, and the aesthetics is improved.

[0045] At the same time, the inner wall surfaces of the fixed seat 1 and the movable seat 2 can be provided with decorative panels of the same material as the cabinet side panel B1 and the door panel B2 to further achieve concealment and aesthetic effects; a first notch k1 connected to the first installation groove c1 is formed on one side of the cabinet side panel B1 close to the door panel B2, and a second notch k2 connected to the second installation groove c2 is formed on one side of the door panel B2 close to the cabinet side panel B1.

[0046] In this example, the fixing seat 1 is recessed outward from the inner wall to form a movable groove c3 , wherein a limiting portion a is formed in the movable groove c3 , and a side of the movable groove c3 close to the movable seat 2 is open.

[0047] In this example, the articulated arm 3 includes an arm body 30, a first bending arm 31 and a second bending arm 32 bent outward from both ends of the arm body 30, wherein the first bending arm 30 is rotatably connected in the movable groove c3 through a pivot s and cooperates with the limiting portion a, and the second bending arm 32 is fixedly connected to the movable seat 2. As the door panel B2 closes, the first bending arm 31 rotates around the center line of the pivot s and disengages from the limiting portion a; as the door panel B2 opens, the first bending arm 31 rotates around the center line of the pivot s and abuts against the limiting portion a, and the door panel B2 and the arm body 30 are flush with the inner wall of the cabinet side panel B1 and / or offset outward. It needs to be explained here that the layout of the fixed seat 1 and the movable seat 2 on the cabinet side panel B1 and the door panel B2 of the present application is adopted. In the normal closed state, the door panel B2 and the cabinet side panel B1 are in a vertical state, and the door panel B2 is opposite to the inner wall of the cabinet side panel B1 from the side close to the cabinet side panel B1, and the door panel B2 is flush with the side of the cabinet side panel B1 close to the door panel B2 or displaced outward from the outer wall (the so-called dislocation refers to the door panel B2 protruding outward relative to the cabinet side panel B1 in the direction of its own thickness), thereby improving the flatness between the door panel and the cabinet side panel in the closed state; in the open state, based on the rotation restriction of the first bending arm 31 by the limit part a, the door panel B2 and the arm body 30 are flush with the inner wall of the cabinet side panel B1 and / or displaced outward, thereby avoiding the space of the cabinet opening.

[0048] In some specific embodiments, both ends of the arm body 30 pass through the first notch k1 and the second notch k2 respectively, wherein the depths of the first notch k1 and the second notch k2 are both greater than or equal to the thickness of the arm body 30. Here, the installation and layout of the articulated arm are facilitated, and interference with the door panel or the cabinet side panel is avoided during the opening and closing of the door panel, and the articulated arm is also facilitated to be hidden when the door panel is closed.

[0049] The limiting portion a is formed at the bottom of the movable groove c3 and is arranged near the pivot s. In this embodiment, the limiting portion a is a mold bar extending along the axial direction of the pivot s; a rotating module m capable of rotating around the center line of the pivot s is fixedly provided at one end of the first bending arm 31 away from the arm body 30, wherein a protrusion b is formed on the rotating module m. As the door panel B2 is opened or closed, the rotating module m rotates around the center line of the pivot s and drives the protrusion b to contact or disengage from the limiting portion a; the opening and closing angle of the door panel B2 is equal to the angle of rotation of the protrusion b around the center line of the pivot, both of which are 0° to 96°. In other words, when the door panel B2 switches between the closed state and the open state, the angle between the door panel B2 and the cabinet side panel B1 changes between 90° and 186°. Here, based on the same angle rotation of the door panel and the protrusion, the opening and closing of the door panel is precisely controlled; at the same time, the structure is simple and easy to implement.

[0050] In some specific embodiments, the rotating module m includes a first mold body m1 and a second mold body m2, wherein the first mold body m1 is sleeved on the pivot s, the second mold body m2 and the protrusion b are respectively integrally formed on the side wall of the first mold body m1, and the first bending arm 31 is fixedly connected to the second mold body m2 from the corresponding end. Two connecting shafts m20 arranged side by side and parallel to the pivot s are inserted on the second mold body m2, and the first bending arm 31 is synchronously connected with the two connecting shafts m20 to achieve fixation, which is convenient for disassembly and assembly, and has high connection strength, thereby enhancing the stability of the connection structure. The second bending arm 32 is fixedly connected to the movable seat 2 by bolts.

[0051] Furthermore, the rotating module m also includes a third mold body m3 integrally formed on the side wall of the first mold body m1; the hinge of this embodiment also includes an elastic member 4 installed on the fixed seat 1, the elastic member 4 abuts against the third mold body m3 and forms a force to drive the door panel B2 to move to a closed state or forms a resistance to hinder the opening and closing of the door panel B2.

[0052] Specifically, the elastic member 4 adopts a torsion spring having a first torsion arm 41 and a second torsion arm 42, wherein the first torsion arm 41 abuts against the fixed seat 1; a first contact surface m31 and a second contact surface m32 are formed on the third mold body m3, which are arranged to intersect with each other, and a dividing angle θ is defined. When the door panel B2 opens from a closed state at an angle less than or equal to θ, the second torsion arm 42 abuts against the first contact surface m31 and drives the door panel B2 to maintain a trend of moving toward a closed state; when the door panel B2 opens from a closed state at an angle greater than θ, the second torsion arm 42 moves and abuts against the second contact surface m32 and forms a resistance that prevents the door panel B2 from rotating around the center line of the pivot s. Here, through the cooperation of the torsion spring and the first and second contact surfaces, when the door panel opening angle is less than or equal to θ, the elastic force of the second torsion arm contacts the first contact surface and pushes the first mold body to rotate around the pivot, thereby driving the door panel to move to a closed state to achieve automatic closing; at the same time, when the door panel opening angle is greater than θ, the first mold body drives the third mold body to rotate to switch to the second contact surface and contact the second torsion arm to form a resistance that hinders the door panel from rotating around the center line of the pivot, so that the door panel can be maintained at any opening angle without external force after opening, so as to facilitate user use. In order to improve the stability of the hinge structure, two third modules m3 are provided and located at both ends of the second module m2, and two torsion springs are provided accordingly.

[0053] For further convenience of implementation, 15°≤θ≤30°, in this embodiment, θ=20°; the first contact surface m31 is a plane, when the door panel B2 opens from the closed state at an angle less than or equal to θ, as the door panel B2 closes, the second torsion arm 42 gradually becomes parallel to the first contact surface m31 and fits or keeps intersecting, in this embodiment, the second torsion arm 42 keeps intersecting with the first contact surface m31, that is, the intersection of the first contact surface m31 and the second contact surface m32 is used to form a conflict with the second torsion arm 42; the second contact surface m32 is an arcuate surface arched toward the second torsion arm 42, and when the door panel B2 opens from the closed state at an angle greater than θ, as the door panel B2 opens, the second torsion arm 42 keeps tangent to the second contact surface m32 and forms an elastic force along the radial direction of the pivot s. The second contact surface m32 adopts an arcuate surface design to avoid the self-locking problem of the second torsion arm 42 in the movement on the second contact surface m32, and ensure the normal opening and closing of the door panel.

[0054] In addition, the hinge of this embodiment also includes a damper 5 installed on the fixed seat 1, wherein the damper 5 is a commercially available product, the telescopic end of the damper 5 extends into the movable groove c3, and as the door panel B2 closes, the arm body 30 gradually contacts the telescopic end of the damper 5, and the damper 5 simultaneously forms a damping to slow down the closing movement trend of the door panel B2; when the door panel B2 is closed, the arm body 30 is hidden in the movable groove c3. Here, as the door panel closes, the damper achieves a buffering effect on the arm body, so that the door panel can be closed slowly. Conversely, when the door panel is opened from the closed state, the damper provides auxiliary thrust, thereby effectively improving the opening and closing texture of the door panel and improving the user experience.

[0055] In summary, after adopting the hinge, the fixed seat and the movable seat are respectively embedded in the installation grooves on the cabinet side panel and the door panel, and the first bent arm bent outward at both ends of the arm body is rotatably connected to the movable groove formed on the fixed seat and cooperates with the limiting part, and the second bent arm is fixed on the movable seat. In this way, the hinge is hidden, and as the door panel opens and closes, the first bent arm is separated from the limiting part to realize the opening and closing of the door panel, or the first bent arm is against the limiting part to ensure that the door panel and the arm body are flush with the inner wall of the cabinet side panel and / or positioned outward to avoid blocking the cabinet opening. Therefore, compared with the prior art, the present invention, on the one hand, realizes hiding of hinges through the layout of fixed seats and movable seats on the cabinet side panels and door panels, and by bending the two ends of the articulated arm to form connections with the fixed seats and movable seats respectively, thereby effectively improving the aesthetics of use; on the other hand, when the door panel is opened, the limiting part is used to ensure that the door panel and the articulated arm are flush with or misaligned with the inner wall of the cabinet side panel, thereby avoiding obstruction of the cabinet opening, that is, achieving the maximum utilization rate of the cabinet opening space and greatly improving the user experience; thirdly, after the hinge is installed, whether the door panel is in the open or closed state, the surface of the cabinet side panel and the door panel can be flat, preventing foreign objects from being stuck in the hinge, and improving the aesthetics at the same time; fourthly, it is convenient for the installation and layout of the articulated arm, avoiding interference with the door panel or the cabinet side panel during opening and closing of the door panel, and at the same time facilitating the hiding of the articulated arm when the door panel is closed; fifthly, based on the door panel and the raised portion rotating at the same angle, The opening and closing of the door panel can be precisely controlled; at the same time, the structure is simple and easy to implement; on the sixth aspect, through the cooperation between the torsion spring and the first contact surface and the second contact surface, when the opening angle of the door panel is less than or equal to θ, the elastic force of the second torsion arm contacts the first contact surface and pushes the first mold body to rotate around the pivot, thereby driving the door panel to move to the closed state to achieve automatic closing; at the same time, when the opening angle of the door panel is greater than θ, the first mold body drives the third mold body to rotate to switch to the second contact surface and contact the second torsion arm to form a resistance that hinders the door panel from rotating around the center line of the pivot, so that the door panel can be maintained at any opening angle without external force after opening, thereby facilitating user use; on the seventh aspect, as the door panel closes, the damper achieves a buffering effect on the arm body, so that the door panel can be slowly closed. On the contrary, when the door panel is opened from the closed state, the damper provides auxiliary thrust, thereby effectively improving the opening and closing texture of the door panel and improving the user experience.

[0056] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hidden hinge structure, comprising a fixed seat arranged on the side panel of the cabinet, a movable seat arranged on the door panel, and a hinge arm, characterized in that: The cabinet side panels and door panels are respectively recessed outward from the inner wall to form a first mounting groove and a second mounting groove, the fixed seat and the movable seat are respectively built in the first mounting groove and the second mounting groove, and the fixed seat is recessed outward from the inner wall to form a movable groove, wherein a limiting portion is formed in the movable groove; The hinged arm includes an arm body, a first bending arm and a second bending arm bent outward from both ends of the arm body, wherein the first bending arm is connected to the movable groove by a pivot rotation and cooperates with the limiting portion, and the second bending arm is fixedly connected to the movable seat. As the door panel closes, the first bending arm rotates around the pivot center line and disengages from the limiting portion; as the door panel opens, the first bending arm rotates around the pivot center line and abuts against the limiting portion, and the door panel and the arm body are flush with the inner wall of the cabinet side panel and / or offset outward.

2. The hidden hinge structure according to claim 1, characterized in that: The inner wall surfaces of the fixed seat and the movable seat are respectively arranged flush with the inner walls of the cabinet side panels and the door panels.

3. The hidden hinge structure according to claim 1, characterized in that: A first notch connected to the first mounting groove is formed on one side of the cabinet side panel close to the door panel, a second notch connected to the second mounting groove is formed on one side of the door panel close to the cabinet side panel, and both ends of the arm body pass through the first notch and the second notch respectively.

4. The hidden hinge structure according to claim 3, characterized in that: The depths of the first notch and the second notch are both greater than or equal to the thickness of the arm body.

5. The hidden hinge structure according to claim 1, characterized in that: The limiting portion is formed at the bottom of the movable groove and is arranged close to the pivot; a rotating module capable of rotating around the center line of the pivot is fixedly provided at one end of the first bending arm away from the arm body, wherein a protrusion is formed on the rotating module, and as the door panel is opened or closed, the rotating module rotates around the center line of the pivot and drives the protrusion to contact or disengage from the limiting portion; the opening and closing angle of the door panel and the angle of rotation of the protrusion around the center line of the pivot are equal, both of which are 0° to 96°.

6. The hidden hinge structure according to claim 5, characterized in that: The rotating module includes a first mold body and a second mold body, wherein the first mold body is sleeved on the pivot, the second mold body and the protrusion are respectively integrally formed on the side wall of the first mold body, and the first bending arm is fixedly connected to the second mold body from the corresponding end.

7. The hidden hinge structure according to claim 6, characterized in that: The rotating module also includes a third mold body integrally formed on the side wall of the first mold body; the hinge also includes an elastic member installed on the fixed seat, the elastic member abuts against the third mold body and forms a power to drive the door panel to move to a closed state or forms a resistance to hinder the opening and closing of the door panel.

8. The hidden hinge structure according to claim 7, characterized in that: The elastic member adopts a torsion spring having a first torsion arm and a second torsion arm, wherein the first torsion arm abuts against the fixed seat; the third mold body is formed with a first contact surface and a second contact surface arranged to intersect each other, defining a boundary angle θ, and when the door panel is opened from a closed state at an angle less than or equal to θ, the second torsion arm abuts against the first contact surface and drives the door panel to maintain a trend of moving toward a closed state; when the door panel is opened from a closed state at an angle greater than θ, the second torsion arm moves and abuts against the second contact surface and forms a damping that hinders the door panel from rotating around the center line of the pivot.

9. The hidden hinge structure according to claim 8, characterized in that: 15°≤θ≤30°; and / or, the first contact surface is a plane, and when the door panel opens from a closed state at an angle less than or equal to θ, as the door panel closes, the second torsion arm gradually becomes parallel to and fits with the first contact surface, or the second torsion arm and the first contact surface remain intersecting; And / or, the second resistance surface is an arc-shaped surface arched toward the second torsion arm, and when the door panel opens from a closed state at an angle greater than θ, as the door panel opens, the second torsion arm remains tangent to the second resistance surface and forms an elastic force along the radial direction of the pivot.

10. The hidden hinge structure according to claim 1, characterized in that: The hinge also includes a damper installed on the fixed seat, wherein the telescopic end of the damper extends into the movable groove, and as the door panel closes, the arm body gradually contacts the telescopic end of the damper, and the damper simultaneously forms a damping to slow down the closing movement trend of the door panel; and / or, when the door panel is closed, the arm body is hidden in the movable groove.

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