Door hinge assembly and door-in-door housing

Abstract

This application relates to the field of storage equipment technology, and discloses a door hinge assembly including a first gear, a second gear, and a locking assembly. The first gear is disposed on the main door via a first hinge plate. The second gear meshes with the first gear and is also disposed on the main door. The locking assembly is disposed on the secondary door, and is connected to the second gear via a second hinge plate. When the main door is opened, the first gear meshes with the second gear, and the second gear drives the second hinge plate to rise, while the locking assembly is engaged, causing the secondary door and the main door to move synchronously. This application also discloses a door-within-a-door housing.

Description

Technical Field

[0001] This application relates to the field of storage equipment technology, such as a door hinge assembly and a door-in-door housing. Background Technology

[0002] As living standards improve, users have increasingly higher demands for storage solutions. For example, door-in-door refrigerators are becoming more popular to enhance user convenience. A door-in-door refrigerator has a main door for opening or closing the refrigerator body and a secondary door for opening or closing the main door. When users can access or store items only through the main door opening, they can open only the secondary door, thus preventing cold air leakage.

[0003] In order to prevent the secondary door from being opened while the main door is being opened, current door-in-door refrigerators will have a door lock installed on the secondary door to lock it onto the main door.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] For the aforementioned door-in-door refrigerators with locks on the secondary door, users need to unlock the secondary door before opening it. This is inconvenient if the user has other items in their hands, thus reducing the user experience. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a door hinge assembly including a first gear, a second gear, and a locking assembly. The first gear is disposed on the main door via a first hinge plate. The second gear meshes with the first gear and is also disposed on the main door. The locking assembly is disposed on the secondary door and is connected to the second gear via a second hinge plate. When the main door is opened, the first gear meshes with the second gear, and the second gear drives the second hinge plate to rise, while the locking assembly is engaged, causing the secondary door and the main door to move synchronously.

[0008] In some embodiments, the second hinge plate includes a connecting rod. The connecting rod connects the second hinge plate and the second gear, and is configured to be height-adjustable. When the main door is opened, the first gear drives the second gear to rotate, causing the connecting rod to rise, which in turn raises the second hinge plate and engages the locking assembly.

[0009] In some embodiments, the connecting rod includes a first cylindrical cam and a second cylindrical cam. The first cylindrical cam is fixedly connected to the shaft of a second gear. The second cylindrical cam is fixedly connected to a second hinge plate and abuts against the first cylindrical cam. The second gear can drive the first cylindrical cam to rotate, causing the first cylindrical cam to lift the second cylindrical cam and the second hinge plate.

[0010] In some embodiments, the locking assembly includes a secondary door bushing and a locking rod. The secondary door bushing is fixedly disposed on the secondary door. The locking rod is inserted into the secondary door bushing and fixedly connected to the second hinge plate. When the second gear rotates, it can drive the locking rod to rise and lock into the secondary door bushing.

[0011] In some embodiments, the connecting rod further includes an elastic element. The elastic element is used to pull the first cylindrical cam and the second cylindrical cam together so that the first cylindrical cam and the second cylindrical cam abut against each other.

[0012] This disclosure also provides a door-in-door housing, including a housing and a door disposed at the opening of the housing, and further including the aforementioned door hinge assembly.

[0013] In some embodiments, the door body includes a main door and a secondary door. A first gear and a second gear are rotatably disposed on the pivot side of the main door. A secondary door bushing is fixedly disposed on the pivot side of the secondary door. When the main door is opened, the first gear drives the second gear to rotate, the connecting rod drives the second hinge plate to rise, so that the locking rod engages with the secondary door bushing, thereby causing the secondary door to move synchronously with the main door.

[0014] In some embodiments, the first hinge plate includes a first end having a shaft hole and a second end fixedly connected to the housing.

[0015] In some embodiments, the shaft of the first gear is fixedly inserted into the shaft hole of the first hinge plate, so that when the main door drives the second gear to move, the first gear rotates relative to the main door, thereby driving the second gear to rotate.

[0016] In some embodiments, a first bushing and a second bushing are provided on the pivoting side of the main door. The shaft of the first gear is rotatably disposed on the first bushing, and the shaft of the second gear is rotatably disposed on the second bushing.

[0017] The door hinge assembly and door-in-door housing provided in this disclosure can achieve the following technical effects:

[0018] The door hinge assembly includes a first gear, a second gear, and a locking assembly. The first gear is mounted on the main door via a first hinge plate. The second gear meshes with the first gear and is also mounted on the main door. The locking assembly is mounted on the secondary door and is connected to the second gear via a second hinge plate. When the main door is opened, the first and second gears mesh, and the second gear causes the second hinge plate to rise, engaging the locking assembly and causing the secondary door to move synchronously with the main door. Thus, when the user opens the main door, the secondary door automatically locks to the main door and moves synchronously with it; when the main door closes, the secondary door automatically unlocks, making it more convenient for the user and improving the user experience.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0021] Figure 1 This is a schematic diagram of the structure of a door hinge assembly provided in an embodiment of this disclosure;

[0022] Figure 2 This is a front view of a door hinge assembly provided in an embodiment of this disclosure;

[0023] Figure 3 This is a schematic diagram of a connecting rod descending according to an embodiment of the present disclosure;

[0024] Figure 4 This is a schematic diagram of a connecting rod rising according to an embodiment of the present disclosure;

[0025] Figure 5 This is a schematic diagram of the disengagement of a snap-fit ​​component provided in an embodiment of this disclosure;

[0026] Figure 6 This is a schematic diagram of the snap-fit ​​structure of a snap-fit ​​component provided in an embodiment of this disclosure;

[0027] Figure 7 This is a schematic diagram of a door-in-door housing provided in an embodiment of this disclosure;

[0028] Figure 8 This is a cross-sectional view of the structure of a door-in-door housing provided in an embodiment of this disclosure.

[0029] Figure label:

[0030] 101: First gear; 102: Second gear; 2: Connecting rod; 201: First cylindrical cam; 202: Second cylindrical cam; 203: Elastic element; 3: First hinge plate; 4: Second hinge plate; 5: Snap-fit ​​assembly; 501: Snap-fit ​​rod; 5011: Snap-fit ​​protrusion; 502: Secondary door bushing; 5021: Snap-fit ​​groove; 6: Main door; 7: Secondary door; 8: Box body. Detailed Implementation

[0031] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0032] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0033] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0034] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0035] Unless otherwise stated, the term "multiple" means two or more.

[0036] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0037] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0039] Existing door-in-door refrigerators, such as those with a door-in-door design, include a main door and a secondary door for user convenience and energy savings. The main door opens or closes the refrigerator's opening and also has its own opening. The secondary door opens or closes the main door's opening. When retrieving items from the refrigerator through the main door's opening, only the secondary door needs to be opened, without opening the main door. To prevent the secondary door from opening automatically when the main door is opened, a lock is installed on the secondary door to prevent it from opening onto the main door.

[0040] However, when using a door-in-door refrigerator with a lock on the secondary door, users need to manually lock or unlock the secondary door. This is inconvenient when the user has other items in their hands, reducing the user experience. Furthermore, installing a lock on the secondary door requires making the door itself thicker to accommodate the lock, which detracts from the refrigerator's overall aesthetics.

[0041] like Figures 1 to 6 As shown, this embodiment of the present disclosure provides a door hinge assembly including a first gear 101, a second gear 102, and a locking assembly 5. The first gear 101 is disposed on the main door 6 via a first hinge plate 3. The second gear 102 meshes with the first gear 101 and is disposed on the main door 6. The locking assembly 5 is disposed on the secondary door 7, and the locking assembly 5 is connected to the second gear 102 via a second hinge plate 4. When the main door 6 is opened, the first gear 101 meshes with the second gear 102, and the second gear 102 drives the second hinge plate 4 to rise, and the locking assembly 5 is in a locked state, causing the secondary door 7 to move synchronously with the main door 6.

[0042] Specifically, the first gear 101 and the second gear 102 are disposed on the main door 6, and the first gear 101 and the second gear 102 are meshed together. When the main door 6 rotates around the first gear 101 to open, the first gear 101 rotates relative to the main door 6 and the second gear 102, thereby driving the second gear 102 to rotate. The shaft of the second gear 102 is connected to the locking assembly 5 through the second hinge plate 4. When the second gear 102 rotates, it can drive the second hinge plate 4 to rise, so that the locking assembly 5 is in a locking state, thereby locking the secondary door 7 to the main door 6, so that when the user rotates the main door 6, the secondary door 7 rotates synchronously with the main door 6. When the main door 6 rotates around the first gear 101 to close, the first gear 101 rotates relative to the main door 6 and the second gear 102, thereby driving the second gear 102 to rotate in the opposite direction. The shaft of the second gear 102 is connected to the locking assembly 5 via the second hinge plate 4. When the second gear 102 rotates in the opposite direction, it can drive the second hinge plate 4 to descend, causing the locking assembly 5 to disengage, thereby unlocking the secondary door 7 to the main door 6, allowing the secondary door 7 to rotate independently. The secondary door 7 rotates synchronously with the main door 6; this can be understood as the locking assembly 5 being in a locked state, locking the secondary door 7 to the main door 6, preventing the secondary door 7 from rotating and opening.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments, the second hinge plate 4 includes a connecting rod 2. The connecting rod 2 is used to connect the second hinge plate 4 and the second gear 102, and the connecting rod 2 is configured as a liftable structure. When the main door 6 is opened, the first gear 101 can drive the second gear 102 to rotate, causing the connecting rod 2 to rise, which in turn drives the second hinge plate 4 to rise, and puts the locking assembly 5 into a locking state.

[0044] Specifically, the second hinge plate 4 includes a first end with a connecting rod 2 and a second end connected to the locking assembly 5, wherein the first end and the second end are arranged opposite to each other. The shaft of the second gear 102 is connected to the connecting rod 2. When the first gear 101 rotates forward to drive the second gear 102 to rotate in the opposite direction, the connecting rod 2 can rise, thereby driving the second hinge plate 4 to rise, so that the locking assembly 5 is in a locked state. When the first gear 101 rotates in the opposite direction to drive the second gear 102 to rotate forward, the connecting rod 2 can fall, thereby driving the connecting rod 2 to fall, so that the locking assembly 5 is in a disengaged state.

[0045] It is understandable that the forward rotation of the first gear 101 can be clockwise or counterclockwise, and can be adapted to the direction in which the main door 6 opens.

[0046] like Figure 2As shown, in some embodiments, the connecting rod 2 includes a first cylindrical cam 201 and a second cylindrical cam 202. The first cylindrical cam 201 is fixedly connected to the shaft of the second gear 102. The second cylindrical cam 202 is fixedly connected to the second hinge plate 4 and abuts against the first cylindrical cam 201. The second gear 102 can drive the first cylindrical cam 201 to rotate, so that the first cylindrical cam 201 lifts the second cylindrical cam 202 and the second hinge plate 4.

[0047] Specifically, the first cylindrical cam 201 is fixedly connected to the shaft of the second gear 102, and the second cylindrical cam 202 is fixedly connected to the second hinge plate 4 and abuts against the first cylindrical cam 201. When the first gear 101 drives the second gear 102 to rotate, the first cylindrical cam 201 rotates synchronously with the second gear 102. In this way, the first cylindrical cam 201 and the second cylindrical cam 202 rotate relative to each other, so that the first cylindrical cam 201 lifts the second cylindrical cam 202, thereby lifting the second hinge plate 4, which is fixedly connected to the second cylindrical cam 202.

[0048] like Figure 3 As shown, in some embodiments, the first cylindrical cam 201 includes a first inclined section. The second cylindrical cam 202 includes a second inclined section. When the main door 6 is closed, the first inclined section and the second inclined section are complementary.

[0049] Specifically, when the main door 6 is closed, the first inclined surface and the second inclined surface complement each other. At this time, the contact area between the first inclined surface and the second inclined surface is the maximum contact area, such as... Figure 3 As shown. When the main door 6 is opened, the first cylindrical cam 201 rotates relative to the second cylindrical cam 202, causing the first inclined surface to lift the second inclined surface. At this time, the contact area between the first and second inclined surfaces gradually decreases to the minimum contact area, as shown. Figure 4 As shown.

[0050] like Figure 3 As shown, in some embodiments, the connecting rod 2 includes an outer side facing the secondary door 7 and an inner side opposite to the outer side. When the main door 6 is closed, the lowest point where the first and second inclined cut surfaces complement each other is located on the inner side.

[0051] Specifically, when the main door 6 is closed, the lowest point of the first inclined section is located on the inner side, and the lowest point of the second inclined section is also located on the inner side, such as... Figure 3 As shown. When the main door 6 is opened, the first cylindrical cam 201 and the second cylindrical cam 202 rotate relative to each other. The lowest point of the first inclined surface rotates to the outer side, and the highest point rotates to the inner side. At this time, the highest point of the first inclined surface abuts against the lowest point of the second inclined surface, thus lifting the second cylindrical cam 202. Figure 4 As shown.

[0052] like Figure 5 and Figure 6 As shown, in some embodiments, the latching assembly 5 includes a secondary door hinge sleeve 502 and a latching rod 501. The secondary door hinge sleeve 502 is fixedly disposed on the secondary door 7. The latching rod 501 is inserted into the secondary door hinge sleeve 502 and is fixedly connected to the second hinge plate 4. When the second gear 102 rotates, it can drive the latching rod 501 to rise and latch onto the secondary door hinge sleeve 502.

[0053] Specifically, the secondary door bushing 502 is fixedly installed inside the secondary door 7, and the locking rod 501 is inserted into the secondary door bushing 502 and can slide up and down within the secondary door bushing 502 to engage or disengage from the secondary door bushing 502. The locking rod 501 is fixedly connected to the second hinge plate 4. The second gear 102 rotates, causing the first cylindrical cam 201 to lift the second cylindrical cam 202 and the second hinge plate 4. The second hinge plate 4 drives the locking rod 501 to slide upward within the secondary door bushing 502, so that the locking rod 501 engages with the secondary door bushing 502. Figure 6 As shown. When the second gear 102 rotates in the reverse direction, causing the second cylindrical cam 202 and the second hinge plate 4 to descend, the second hinge plate 4 drives the locking rod 501 to slide downward within the sub-door bushing 502, so that the locking rod 501 disengages from the sub-door bushing 502, as shown. Figure 5 As shown.

[0054] In some embodiments, the bottom end of the secondary door bushing 502 is provided with a snap-fit ​​groove 5021. The snap-fit ​​rod 501 is provided with a snap-fit ​​protrusion 5011 at the position corresponding to the snap-fit ​​groove 5021. The second cylindrical cam 202 can drive the snap-fit ​​rod 501 to rise through the second hinge plate 4, and the snap-fit ​​protrusion 5011 is inserted into the snap-fit ​​groove 5021, so that the snap-fit ​​assembly 5 is in a snap-fit ​​state.

[0055] Specifically, the first cylindrical cam 201 lifts the second cylindrical cam 202, and through the second hinge plate 4, drives the locking rod 501 to slide upward within the sub-door bushing 502, causing the locking protrusion 5011 to move upward and embed into the locking groove 5021, thereby putting the locking assembly 5 into a locking state. Figure 6 As shown. Similarly, the first cylindrical cam 201 lowers the second cylindrical cam 202, and through the second hinge plate 4, drives the locking rod 501 to slide downward within the sub-door bushing 502, so that the locking protrusion 5011 moves downward and disengages from the locking groove 5021, thereby causing the locking assembly 5 to be in a disengaged state, as shown. Figure 5 As shown.

[0056] In some embodiments, the length of the snap-fit ​​groove 5021 is greater than or equal to the maximum lifting height of the second cylindrical cam 202 by the first cylindrical cam 201.

[0057] Specifically, the maximum lifting height of the first cylindrical cam 201 on the second cylindrical cam 202 can be 4 / 5, 3 / 4, 2 / 3, or 1 / 2 of the length of the locking groove 5021. In this way, when the first cylindrical cam 201 fully lifts the second cylindrical cam 202, the locking groove 5021 cannot interfere with the movement of the locking protrusion 5011.

[0058] Understandably, if the length of the locking groove 5021 is less than the maximum lifting height of the second cylindrical cam 202 by the first cylindrical cam 201, when the first cylindrical cam 201 lifts the second cylindrical cam 202 and drives the locking rod 501 to rise through the second hinge plate 4, the locking groove 5021 will interfere with the movement of the locking protrusion 5011, thereby limiting the second cylindrical cam 202 from continuing to rise.

[0059] In some embodiments, the bottom end of the secondary door bushing 502 is symmetrically provided with two sets of snap-fit ​​grooves 5021. The snap-fit ​​rod 501 is provided with two sets of snap-fit ​​protrusions 5011 at the positions corresponding to the snap-fit ​​grooves 5021.

[0060] Understandably, the auxiliary door hinge sleeve 502 and the snap-fit ​​rod 501 are respectively provided with two sets of snap-fit ​​grooves 5021 and snap-fit ​​protrusions 5011, which can improve the stability of the snap-fit ​​assembly 5 when snap-fitting.

[0061] In some embodiments, the length of the snap-fit ​​protrusion 5011 is equal to the length of the snap-fit ​​groove 5021.

[0062] like Figure 4 As shown, in some embodiments, the connecting rod 2 further includes an elastic element 203. The elastic element 203 is used to pull the first cylindrical cam 201 and the second cylindrical cam 202 together so that the first cylindrical cam 201 and the second cylindrical cam 202 abut against each other.

[0063] Specifically, the first cylindrical cam 201 is provided with a first receiving cavity, and the second cylindrical cam 202 is provided with a second receiving cavity corresponding to the first receiving cavity. The first end of the elastic element 203 is fixedly disposed in the first receiving cavity, and the second end is fixedly disposed in the second receiving cavity, so that when the first cylindrical cam 201 pushes up or lowers the second cylindrical cam 202, the second cylindrical cam 202 is always in contact with the first cylindrical cam 201.

[0064] Furthermore, the elastic element 203 is configured as a tension spring.

[0065] In some embodiments, when the main door 6 is in the closed state, the top surface of the snap-fit ​​protrusion 5011 is flush with the bottom surface of the snap-fit ​​groove 5021.

[0066] Specifically, when the main door 6 is closed, the top surface of the locking protrusion 5011 is flush with the bottom surface of the locking groove 5021. Thus, when the main door 6 is opened, the connecting rod 2 can drive the locking rod 501 to rise and lock into the secondary door bushing 502.

[0067] In some embodiments, the snap-fit ​​slot 5021 is a vertical straight line.

[0068] Understandably, setting the snap-fit ​​groove 5021 to a vertical straight line is beneficial for the snap-fit ​​protrusion 5011 to snap into the snap-fit ​​groove 5021.

[0069] In some embodiments, the length of the snap-fit ​​slot 5021 is greater than or equal to a preset length.

[0070] Specifically, the length of the snap-fit ​​slot 5021 is greater than or equal to 0.5 mm. For example, the length of the snap-fit ​​slot 5021 can be 1 mm, 1.5 mm, or 2 mm.

[0071] like Figure 7 and Figure 8 As shown, this embodiment of the present disclosure also provides a door-in-door housing, including a housing 8 and a door disposed at the opening of the housing 8, and also includes the aforementioned door hinge assembly.

[0072] Specifically, the aforementioned door hinge assembly is installed inside the door body and is connected to the main door 6 via the first hinge plate 3.

[0073] like Figure 8 As shown, in some embodiments, the door body includes a main door 6 and a secondary door 7. A first gear 101 and a second gear 102 are rotatably disposed on the pivot side of the main door 6. A secondary door bushing 502 is fixedly disposed on the pivot side of the secondary door 7. When the main door 6 is opened, the first gear 101 drives the second gear 102 to rotate, the connecting rod 2 drives the second hinge plate 4 to rise, so that the locking rod 501 locks into the secondary door bushing 502, thereby causing the secondary door 7 to move synchronously with the main door 6.

[0074] Specifically, the first gear 101 and the second gear 102 are located on the pivot side of the main door 6, and the main door 6 can rotate around the first gear 101 to open or close the opening of the housing 8. When the main door 6 is opened, the first gear 101 rotates relative to the main door 6 and the second gear 102, thereby driving the second gear 102 to rotate. The shaft of the second gear 102 is connected to the locking assembly 5 through the second hinge plate 4. When the second gear 102 rotates, it can drive the second hinge plate 4 to rise, so that the locking assembly 5 is in a locking state, thereby locking the secondary door 7 to the main door 6, so that when the user rotates the main door 6, the secondary door 7 rotates synchronously with the main door 6. When the main door 6 is closed, the locking assembly 5 is in a disengaged state, and the secondary door 7 can rotate independently relative to the main door 6, so that the user can close the main door 6 and open the secondary door 7 separately.

[0075] In some embodiments, the first hinge plate 3 includes a first end having a shaft hole and a second end fixedly connected to the housing 8.

[0076] In some embodiments, the shaft of the first gear 101 is fixedly inserted into the shaft hole of the first hinge plate 3 so that when the main door 6 drives the second gear 102 to move, the first gear 101 rotates relative to the main door 6, thereby driving the second gear 102 to rotate.

[0077] Specifically, the shaft hole of the first hinge plate 3 is configured as an irregularly shaped shaft hole so that when the shaft of the first gear 101 is inserted into the shaft hole, it will not rotate relative to the first hinge plate 3. In this way, when the main door 6 is opened, since the first hinge plate 3 is fixedly connected to the housing 8, the first gear 101 will not rotate relative to the housing 8, but will rotate relative to the main door 6 to drive the second gear 102 to rotate.

[0078] In some embodiments, a first bushing and a second bushing are provided on the pivoting side of the main door 6. The shaft of the first gear 101 is rotatably disposed on the first bushing, and the shaft of the second gear 102 is rotatably disposed on the second bushing.

[0079] In some embodiments, the door housing described above also includes an end cap.

[0080] Specifically, the end cap is disposed at the shaft hole of the first hinge plate 3, and is used to fix the shaft of the first gear 101 in the shaft hole of the first hinge plate 3.

[0081] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A door hinge assembly comprising: The door hinge assembly comprises: a first gear wheel arranged on the main door through a first hinge plate; a second gear wheel engaged with the first gear wheel, and arranged on the main door; and a clamping assembly arranged on the auxiliary door and connected with the second gear wheel through a second hinge plate, wherein when the main door is opened, the first gear wheel engages with the second gear wheel, and the second gear wheel drives the second hinge plate to rise, and the clamping assembly is in a clamping state, so that the auxiliary door moves synchronously with the main door. The second hinge plate comprises:

2. The door hinge assembly of claim 1, wherein, a connecting rod for connecting the second hinge plate and the second gear wheel, and the connecting rod is configured as a liftable structure, wherein when the main door is opened, the first gear wheel drives the second gear wheel to rotate, so that the connecting rod rises, and in turn drives the second hinge plate to rise, and the clamping assembly is in a clamping state. The connecting rod comprises:

3. The door hinge assembly of claim 2, wherein, a first cylindrical cam fixedly connected with the shaft of the second gear wheel; and a second cylindrical cam fixedly connected with the second hinge plate and abutting against the first cylindrical cam, wherein the second gear wheel drives the first cylindrical cam to rotate, so that the first cylindrical cam lifts the second cylindrical cam and the second hinge plate. The clamping assembly comprises:

4. The door hinge assembly of claim 1, wherein, an auxiliary door shaft sleeve fixedly arranged on the auxiliary door; and a clamping rod inserted into the auxiliary door shaft sleeve and fixedly connected with the second hinge plate, wherein when the second gear wheel rotates, the clamping rod is driven to rise and clamp in the auxiliary door shaft sleeve. The connecting rod further comprises:

5. The door hinge assembly of claim 3, wherein, a resilient element for tensioning the first cylindrical cam and the second cylindrical cam, so that the first cylindrical cam and the second cylindrical cam abut against each other. Further comprising:

6. A door-in-door cabinet comprising a cabinet and a door body arranged at an opening of the cabinet, characterized in that, the door hinge assembly according to any one of claims 1 to 5. The door body comprises:

7. The box according to claim 6, wherein a main door, and the first gear wheel and the second gear wheel are rotatably arranged on the pivot side of the main door; and an auxiliary door, and the auxiliary door shaft sleeve is fixedly arranged on the pivot side of the auxiliary door, wherein when the main door is opened, the first gear wheel drives the second gear wheel to rotate, the connecting rod drives the second hinge plate to rise, the clamping rod clamps in the auxiliary door shaft sleeve, and in turn the auxiliary door moves synchronously with the main door.

8. The door-in-door box according to claim 7, wherein the first hinge plate comprises a first end provided with a shaft hole, and a second end fixedly connected with the box.

9. The door-in-door box according to claim 8, wherein the shaft of the first gear wheel is fixedly inserted into the shaft hole of the first hinge plate, so that when the main door drives the second gear wheel to move, the first gear wheel rotates relative to the main door, and in turn drives the second gear wheel to rotate.

10. The door-in-door box according to claim 7, wherein the pivot side of the main door is provided with a first shaft sleeve and a second shaft sleeve, wherein the shaft of the first gear wheel is rotatably arranged in the first shaft sleeve, and the shaft of the second gear wheel is rotatably arranged in the second shaft sleeve. ​

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