The present invention relates to the field of refrigeration technologies, and in particular, to a refrigeration device and a door structure for the refrigeration device.

When a refrigeration device is used, a handle is generally disposed on a door to facilitate opening of the door. Handles in early days protrude from doors; such a handle needs cleaning regularly because dust is accumulated, and also causes a less concise door structure. Therefore, more and more refrigeration devices use hidden handles, which are also referred as recessed handles. The recessed handle refers to that a recessed groove used for a user to put a hand in is provided at a certain position on the door. However, the existing recessed handles are not firm during a mounting process.

Moreover, JP H06-051772 U discloses a mounting device of the configuration of a handle which is adapted to be attached to an opening formed in an outer plane of a closing body, according to the preamble of claim 1. EP 2 385 331 A1 discloses a door handle and refrigerator having the same. EP 0 781 971 A1 discloses a door handle assembly. DE 10 2010 028 414 A1 discloses a cooling device having a door leaf having a shell type handle. Finally, JP H03-148579 A discloses a mounting structure for a door handle.

The problem solved by the present invention is how to improve the firmness of a recessed handle.

In order to solve the forgoing problem, the present invention provides a door structure for a refrigeration device according to claim 1, including:

• a door housing, having an opening, where the door housing includes a front panel and a side panel, and the opening is located partially in the front panel and partially in the side panel;
• a door handle, having a recessed groove and a flange located along an opening of the recessed groove, where the recessed groove of the door handle is located in the opening of the door housing, and the flange of the door handle is connected partially to the front panel and partially to the side panel by an insertion-receiving structure, the insertion-receiving structure limits the door handle at least in two perpendicular dimensions of a surface of the front panel and in a third dimension perpendicular to the surface of the front panel, or limits the door handle at least in two perpendicular dimensions of a surface of the side panel and in a third dimension perpendicular to the surface of the side panel.

Additionally, the insertion-receiving structure includes projecting tongues disposed along the opening of the door housing, wherein the projecting tongues extend along a rear side of the door housing.

Finally, the front panel is perpendicular to the side panel, the projecting tongue on the front panel is perpendicular to the front panel, and the projecting tongue on the side panel is perpendicular to the side panel.

Optionally, the insertion-receiving structure includes grooves provided in the flange of the door handle.

Optionally, the flange of the door handle includes multiple edges, and the grooves are connected to each other and formed on all the edges of the flange of the door handleOptionally, the opening of the door housing includes multiple edges, and the projecting
tongues are formed on all the edges of the opening and form a close loop.

Optionally, each of the grooves includes two opposite ends, where one end is connected to a main body of the door handle, and the other end has an extension part attached to the front panel of the door housing or the side panel of the door housing.

Optionally, a U-shaped structure is formed between the groove connecting to the side panel and a main body of the door handle.

Optionally, the opening of the door housing includes six edges forming a close loop, where a first upper edge, a first lower edge and a first side edge which connects the first upper edge and the first lower edge are located on the side panel, a second upper edge, a second lower edge and a second side edge which connects the second upper edge and the second lower edge are located on the front panel, the first upper edge is connected to the second upper edge, and the first lower edge is connected to the second lower edge.

Optionally, the insertion-receiving structure includes projecting tongues disposed along the opening of the door housing, and grooves disposed in the flange of the door handle, the projecting tongues are formed along the first upper edge, the first side edge, and the second side edge, or the projecting tongues are formed along the second upper edge, the second side edge, and the first side edge.

Optionally, the opening of the door housing includes four edges forming a close loop, where a first upper edge, a first lower edge and a first side edge which connects the first upper edge and the first lower edge are located on the side panel, a first curved side edge is on the front panel, one end of the first curved side edge is connected to the first upper edge, and the other end is connected to the first lower edge.

Optionally, the insertion-receiving structure includes projecting tongues disposed along the opening of the door housing, and grooves provided in the flange of the door handle, the projecting tongues are formed along the first upper edge, the first side edge, and the first curved side edge, or the projecting tongues are formed along the first lower edge, the first side edge, and the first curved side edge.

Optionally, the projecting tongues are formed in a stamping process, and the projecting tongues are of flanging structure.

Optionally, before the stamping process, at a corner of neighboring edges of the opening of the door housing, partial structure of the door housing is removed.

Optionally, the refrigeration device is a refrigerator or a wine cabinet.

Optionally, when the refrigeration device is a refrigerator, the refrigerator is a single-door refrigerator, a French-door refrigerator, or a multiple-door refrigerator.

On the basis of the forgoing door structure, the present invention further provides a refrigeration device including the forgoing door structure.

Compared with the prior art, the technical solutions of the present invention have the following advantages: 1) According to analysis, one cause of the poor firmness of an existing recessed handle is that the recessed handle is formed on one panel of a door structure, such as a side panel, where the recessed handle and the side panel are only fastened in two dimensions, and therefore, the firmness of the recessed handle is limited. On the basis of the forgoing analysis, the present invention proposes that an opening of a door housing is provided in two panels connected to each other, that is, the opening is opened partially in the side panel and partially in a front panel; accordingly, after a recessed groove is placed into the opening, a flange part along an opening of the recessed groove is connected partially to the front panel of the door housing and partially to the side panel by an insertion-receiving structure, and the insertion-receiving structure limits the door handle at least in two perpendicular dimensions of a surface of the front panel and in a third dimension perpendicular to the surface of the front panel, so as to achieve that the door handle is not only immobile in a height direction or in a length direction of the front panel, but also immobile in a depth direction perpendicular to the front panel, thereby enhancing the firmness of the door handle; or the insertion-receiving structure limits the door handle at least in two perpendicular dimensions of a surface of the side panel and in a third dimension perpendicular to the surface of the side panel, so as to achieve that the door handle is not only immobile in a height direction or in a length direction of the side panel, but also immobile in a depth direction perpendicular to the side panel, thereby also enhancing the firmness of the door handle. In addition, the manner of fastening by means of insertion simplifies assembly of the handle and the door housing, and reduces an assembly workload.

• 2) In an optional solution, the insertion-receiving structure includes projecting tongues disposed along the opening of the door housing, and preferably grooves provided in the flange of the door handle, where the projecting tongues may be of flanging structure formed in a stamping process on the door housing, or a metal sheet welded along the opening of the door housing; a material of the door handle is usually plastic or the like, the groove in the flange may be formed in an injection molding process, and the forgoing processes all have low costs.
• 3) In an optional solution, the projecting tongues in the optional solution 2) extend along a rear side of the door housing. In this way, a front side structure of the door housing is relatively concise.
• 4) In an optional solution, the front panel in the optional solution 2) is perpendicular to the side panel, the projecting tongue on the front panel is perpendicular to the front panel, and the projecting tongue on the side panel is perpendicular to the side panel. In this way, after fitting with the groove of the door handle, the projecting tongue on the front panel can limit the door handle in a direction perpendicular to the side panel, and after fitting with the groove of the door handle, the projecting tongue on the side panel can limit the door handle in a direction perpendicular to the front panel.
• 5) In an optional solution, the flange of the door handle in the optional solution 2) includes multiple edges, and the grooves in the flange are connected to each other and formed in all the edges of the flange of the door handle. The forgoing solution of arranging the grooves around the opening of the recessed groove of the door handle enables the projecting tongues to be easily inserted into the grooves, that is, facilitates fastening of the door handle and the door housing.
• 6) In an optional solution, on the basis of the optional solution 5), the opening of the door housing includes multiple edges, and the projecting tongues are formed on all the edges of the opening and form a close loop. The forgoing solution of arranging the projecting tongues along the opening of the door housing and arranging the grooves along the opening of the recessed groove of the door handle can prevent a foaming liquid from flowing out during foaming, which is beneficial to the neatness of the door structure.
• 7) In an optional solution, each of the grooves in the optional solution 2) includes two opposite ends, where one end is connected to a main body of the door handle, and the other end has an extension part attached to the front panel of the door housing or the side panel of the door housing. A small but long gap is disposed between the extension part and the front panel of the door housing or the side panel of the door housing, to prevent a foaming liquid from flowing out.
• 8) In an optional solution, a U-shaped structure is formed between the groove connecting to the side panel, in the optional solution 2), and a main body of the door handle. The U-shaped structure makes it easy to control a gap size at an opening part of the groove on the door handle and a gap size at the bottom of the groove in an injection process.
• 9) In an optional solution, the opening of the door housing includes six edges forming a close loop, where a first upper edge, a first lower edge and a first side edge which connects the first upper edge and the first lower edge are located on the side panel, a second upper edge, a second lower edge and a second side edge which connects the second upper edge and the second lower edge are located on the front panel, the first upper edge is connected to the second upper edge, and the first lower edge is connected to the second lower edge, providing a specific solution for the door structure.
• 10) In an optional solution, for the door housing of the optional solution 9), the insertion-receiving structure includes projecting tongues disposed along the opening of the door housing, and grooves provided in the flange of the door handle; in solution a): the projecting tongues are disposed along the first upper edge, the first side edge, and the second side edge; the projecting tongues and the grooves that are along the first upper edge and the first side edge restrict the door handle from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the side panel, and the projecting tongue and the groove that are along the second side edge restrict the door handle from moving in a depth direction in a third dimension of an orthogonal coordinate system; and in solution b): the projecting tongues are disposed along the second upper edge, the second side edge, and the first side edge; the projecting tongues along the second upper edge, the second side edge, and the groove restrict the door handle from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the front panel, and the projecting tongue and the groove that are on the first side edge restrict the door handle from moving in a depth direction in a third dimension of an orthogonal coordinate system.
• 11) In an optional solution, the opening of the door housing includes four edges forming a close loop, where a first upper edge, a first lower edge and a first side edge which connects the first upper edge and the first lower edge are located on the side panel, a first curved side edge is on the front panel, one end of the first curved side edge is connected to the first upper edge, and the other end is connected to the first lower edge, providing another specific solution for the door structure.
• 12) In an optional solution, for the door housing of the optional solution 11), the insertion-receiving structure includes projecting tongues disposed along the opening of the door housing, and grooves provided in the flange of the door handle; in solution (a): the projecting tongues are disposed along the first upper edge, the first side edge, and the first curved side edge; the projecting tongues and grooves on that along the first upper edge and the first side edge restrict the door handle from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the side panel; and the projecting tongue and the groove that are along the first curved side edge restrict the door handle from moving in a depth direction in a third dimension of an orthogonal coordinate system; in solution (b): the projecting tongues are disposed along the first lower edge, the first side edge, and the first curved side edge; the projecting tongues and the grooves that are along the first lower edge and the first side edge restrict the door handle from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the side panel; and the projecting tongue and the groove that are along the first curved side edge restrict the door handle from moving in a depth direction in a third dimension of an orthogonal coordinate system.
• 13) In an optional solution, the projecting tongues in the optional solution 2) are preferably of flanging structure formed in a stamping process, and are easy to manufacture and have low costs.
• 14) In an optional solution, before the stamping process in the optional solution 13) is performed, at a corner of neighboring edges of the opening of the door housing, partial structure of the door housing is removed. By means of the forgoing solution, the corner is not easily folded, and an excessive thickness, which is caused by the folded corner, at some parts of the flanging structures is avoided, thereby preventing a failure in assembly with the grooves of the door handle.
• 15) In an optional solution, the refrigeration device is a refrigerator or a wine cabinet.
• 16) In an optional solution, when the refrigeration device is a refrigerator, the refrigerator is a single-door refrigerator, a French-door refrigerator, or a multiple-door refrigerator.

• FIG. 1 is a sectional view of a door structure for a refrigeration device according to Embodiment 1 of the present invention;
• FIG. 2 is a schematic structural diagram of a door housing according to Embodiment 1;
• FIG. 3 is a schematic structural diagram of a door handle according to Embodiment 1;
• FIG. 4 is a sectional view of a door handle according to Embodiment 1;
• FIG. 5 is a schematic structural diagram of a door housing according to Embodiment 2;
• FIG. 6 is a schematic structural diagram of a door handle according to Embodiment 2;
• FIG. 7 is a schematic structural diagram of a door housing according to Embodiment 3; and
• FIG. 8 is a schematic structural diagram of a door handle according to Embodiment 3.

As is described in the background, existing recessed handles are not firm. According to analysis, one cause of the forgoing problem is that the recessed handle is formed on one panel of a door structure, such as a side panel, and the recessed handle and the side panel are only fastened in two dimensions, thereby resulting in the poor firmness of the recessed handle. On the basis of the forgoing analysis, the present invention proposes that an opening of a door housing is provided on two panels which are connected to each other, that is, the opening is opened partially in the side panel and partially in a front panel; accordingly, after a recessed groove is placed into the opening, a flange along an opening of the recessed groove is connected partially to the front panel of the door housing and partially to the side panel by an insertion-receiving structure, and the insertion-receiving structure limits the door handle at least in two perpendicular dimensions of a surface of the front panel and in a third dimension perpendicular to the surface of the front panel, so as to achieve that the door handle is not only immobile in a height direction and a length direction of the front panel, but also immobile in a depth direction perpendicular to the front panel, thereby enhancing the firmness of the door handle; or the insertion-receiving structure limits the door handle at least in two perpendicular dimensions of a surface of the side panel and in a third dimension perpendicular to the surface of the side panel, so as to achieve that the door handle is not only immobile in a height direction and a length direction of the side panel, but also immobile in a depth direction perpendicular to the side panel, thereby also enhancing the firmness of the door handle.

To make the foregoing objectives, features, and advantages of the present invention clearer and more comprehensible, the following describes specific embodiments of the present invention in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a door structure for a refrigeration device according to this embodiment. FIG. 2 is a schematic structural diagram of a door housing, FIG. 3 is a schematic structural diagram of a door handle, and FIG. 4 is a sectional view of a door handle. Referring to FIG.1 to FIG. 4, the door structure includes:

• a door housing 1, having an opening 10, where the door housing 1 includes a front panel 11 and a side panel 12 which are connected to each other, and the opening 10 is located partially in the front panel 11 and partially in the side panel 12; and
• a door handle 2, having a recessed groove 20 and a flange 21 located along an opening of the recessed groove 20, where the recessed groove 20 of the door handle 2 is located along the opening 10 of the door housing, the flange 21 of the door handle 2 is connected partially to the front panel 11 and partially to the side panel 12 by an insertion-receiving structure, and the insertion-receiving structure limits the door handle 2 in two perpendicular dimensions of a surface of the side panel 12 and in a third dimension perpendicular to the surface of the side panel 12, as well as in two perpendicular dimensions of a surface of the front panel 11 and in a third dimension perpendicular to the surface of the front panel 11.

Descriptions are provided in the following.

Referring to FIG. 1 and FIG. 2, in this embodiment, the front panel 11 of the door housing 1 is perpendicular to the side panel 12 of the door housing 1. In another embodiment, the front panel and the side panel may not be perpendicular, and it is acceptable that an included angle is formed therebetween.

During a manufacturing procedure of the door housing 1, the front panel 11 and the side panel 12 may be integrally formed, making a neat appearance of the door structure, or the two may also be connected by using another process such as welding.

Still referring to FIG. 1 and FIG. 2, in this embodiment, the opening 10 of the door housing 1 includes six edges forming a close loop, where a first upper edge 101, a first lower edge 102 and a first side edge 103 which connects the first upper edge 101 and the first lower edge 102 are located on the side panel 12, a second upper edge 104, a second lower edge 105 and a second side edge 106 which connects the second upper edge 101 and the second lower edge 105 are located on the front panel, the first upper edge 101 is connected to the second upper edge 104, and the first lower edge 102 is connected to the second lower edge 105. Specifically, projecting tongues 13 are disposed along the first upper edge 101, the first lower edge 102, and the first side edge 103 that are on the side panel 12, and projecting tongues 13 are also disposed along the second upper edge 104, the second lower edge 105 and the second side edge 106 that are on the front panel 11; in other words, the projecting tongues 13 are formed on all the edges of the opening 10 and form a close loop, or known as being arranged around the opening 10.

Referring to FIG. 1, FIG. 3, and FIG. 4, the flange 21 of the door handle 2 corresponds to the opening 10 of the door housing 1, and also has six edges. Grooves 22 are provided in the flange 21, and the grooves 22 are suitable for insertion of the projecting tongues 13, and form the insertion-receiving structure with the projecting tongues 13. The door handle 2 is connected to the door housing 1 by the insertion-receiving structure, and therefore, positions of the grooves 22 on the door handle 2 need to correspond to positions of the projecting tongues 13 on the door housing 1. Based on the fact that the projecting tongues 13 are arranged along the opening 10 of the door housing 1, the grooves 22 are connected to each other and formed on all the edges of the flange 21, and are arranged along the entire opening of the recessed groove 20, or known as being arranged around the opening of the recessed groove 20 of the door handle.

It can be understood that, the projecting tongues 13 and the groove 22 that are along the first upper edge 101, the first lower edge 102, and the first side edge 103 restrict the door handle 2 from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the side panel 12, and the projecting tongue 13 and the and the groove 22 that are along the second side edge 106 restrict the door handle 2 from moving in a depth direction in a third dimension of an orthogonal coordinate system; the projecting tongues 13 and the grooves 22 that are along the second upper edge 104, the second lower edge 105, and the second side edge 106 restrict the door handle 2 from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the front panel 11, and the projecting tongues 13 and the groove 22 that are along the first side edge 103 restrict the door handle 2 from moving in a depth direction in a third dimension of an orthogonal coordinate system. The forgoing solution can enhance the firmness of the door handle 2, and in addition, the manner of fastening by means of insertion simplifies assembly of the door handle 2 and the door housing 1, and reduces an assembly workload.

The forgoing solution of arranging the projecting tongues 13 around the opening 10 of the door housing 1 and arranging the grooves 22 along the opening of the recessed groove 20 of the door handle 2 can also prevent a foaming liquid from flowing out during foaming, which is beneficial to the neatness of the door structure.

In order to further prevent the foaming liquid from flowing out to pollute a front side (that is, a side facing a user) of the door structure, referring to FIG. 1 and FIG. 4, each of the grooves 22 includes two opposite ends, where one end is connected to a main body of the door handle 2, and the other end has an extension part 23 attached to the front panel 11 of the door housing or the side panel 12 of the door housing. A small but long gap is disposed between the extension part 23 and the front panel 11 of the door housing or the side panel 12 of the door housing, achieving an effect of preventing the foaming liquid from flowing out.

A material of the door handle 2 is usually plastic or the like, the groove 22 in the flange can be formed in an injection molding process, and the processes has low costs.

In addition, referring to FIG. 1 and FIG. 4, a U-shaped structure 24 is formed between the groove 22 connecting to the side panel 12 and a main body of the door handle. The U-shaped structure 24 makes it easy to control a gap size at an opening part of the groove 22 of the door handle 2 and a gap size at the bottom of the groove 22 in an injection process.

Referring to FIG. 1 and FIG. 2, the projecting tongues 13 are preferably of flanging structure formed in a stamping process, and the flanging structure is easy to manufacture and has low costs. Before the stamping process, at a corner of neighboring edges of the opening 10 of the door housing 1, partial structure of the door housing is removed. By means of the forgoing solution, the corner is not easily folded, and an excessive thickness, which is caused by the folded corner, at some parts of the flanging structure is avoided, thereby preventing a failure in subsequent assembly with the grooves 22 of the door handle 2. In this embodiment, a square structure is removed at the corner of the neighboring edges, and therefore, after the stamping process, a flanging structure at the corner is shorter than a flanging structure of each edge. Certainly, the projecting tongues 13 may also be fastened on the door housing 1 in another process such as welding.

In addition, in this embodiment, the projecting tongues 13 extend along a rear side of the door housing 1. In this way, a front side (that is, a side facing a user) structure of the door housing is relatively concise. In another embodiment, it is also feasible that the projecting tongues 13 extend along the front side of the door housing 1, and fit with the grooves 22 on the door handle 2, thereby positioning the door handle 2 in three dimensions of an orthogonal coordinate system.

In addition, referring to FIG. 1, the projecting tongue 13 on the front panel 11 is perpendicular to the front panel 11, and the projecting tongue 13 on the side panel 12 is perpendicular to the side panel 12. In this way, after fitting with the groove 22 of the door handle 2, the projecting tongue 13 on the front panel 11 can limit the door handle 2 in a direction perpendicular to the side panel 12, and after fitting with the groove 22 of the door handle 2, the projecting tongue 13 on the side panel 12 can limit the door handle 11 in a direction perpendicular to the front panel 11.

On the basis of the forgoing door structure, a refrigeration device including the forgoing door structure is further provided in this embodiment. Specifically, the refrigeration device may be a refrigerator, for example, a single-door refrigerator, a French-door refrigerator, or a multiple-door refrigerator, that is, the forgoing door structure has no limit on the number of doors and an arrangement manner of two doors. In another embodiment, the forgoing door structure may also be used for a wine cabinet.

A door structure and a refrigeration device provided by Embodiment 2 are substantially identical to that of Embodiment 1. A difference lies in that: the insertion-receiving structure limits a door handle 2 in two perpendicular dimensions of a surface of a side panel 12 and in a third dimension perpendicular to the surface of the side panel 12.

Specifically, FIG. 5 is a schematic structural diagram of a door housing 1 according to this embodiment. Referring to FIG. 5, projecting tongues 13 are only disposed along a first lower edge 102, a first side edge 103 and a second side edge 106.

FIG. 6 is a schematic structural diagram of a door handle. Positions of grooves 22 in the door handle 2 at least need to correspond to positions of the projecting tongues 13 on the door housing 1. Referring to FIG. 6, in this embodiment, the grooves 22 are only provided in the first lower edge 102, the first side edge 103 and the second side edge 106. In another embodiment, the grooves 22 may also be arranged around an entire opening of the door handle 2. During a foaming procedure after the door handle 2 is placed into an opening 10 of the door housing 1, in order to prevent a foaming liquid from flowing out to pollute a front side of the door housing 1, a sealing structure is disposed around an entire intersecting surface between a flange 21 of the door handle 2 and the door housing 1, for example, a tape is used for sealing.

Referring to FIG. 5 and FIG. 6, after the door handle 2 and the door housing 1 are assembled, the projecting tongues 13 are inserted into the grooves 22, thereby forming the insertion-receiving structure. The projecting tongues 13 and the grooves 22 that are along the first lower edge 102 and the first side edge 103 restrict the door handle 2 from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the side panel 12, and the projecting tongue 13 and the groove 22 that are along the second side edge 106 restrict the door handle 2 from moving in a depth direction in a third dimension of an orthogonal coordinate system.

In another embodiment, the projecting tongues 13 and the grooves 22 that are along the first upper edge 101 and the first side edge 103 can also achieve an effect of restricting the door handle 2 from moving in a height direction and length direction in two perpendicular dimensions of the surface of the side panel 12.

In addition, the insertion-receiving structure can also limit the door handle 2 in two perpendicular dimensions of a surface of a front panel 11 and in a third dimension perpendicular to the surface of the front panel 11. Accordingly, there are two implementation solutions. Solution a): the projecting tongues 13 are disposed along the second upper edge 104, the second side edge 106, and the first side edge 103, the projecting tongues 13 and the grooves 22 that are along the second upper edge 104 and the second side edge 106 restrict the door handle 2 from moving in a height direction and a length direction in two perpendicular dimensions of the surface of the front panel 11, and the projecting tongue 13 and the groove 22 that are along the first side edge 103 restrict the door handle 2 from moving in a depth direction in a third dimension of an orthogonal coordinate system. Solution b): the projecting tongues 13 are disposed along the second lower edge 105, the second side edge 106, and the first side edge 103, the projecting tongues 13 and the grooves 22 that are along the second lower edge 105 and the second side edge 106 restrict the door handle 2 from moving in a height direction and a length direction in two perpendicular dimensions of the surface of the front panel 11, and the projecting tongue 13 and the groove 22 that are along the first side edge 103 restrict the door handle 2 from moving in a depth direction in a third dimension of an orthogonal coordinate system.

A door structure and a refrigeration device provided by the Embodiment 3 are substantially identical to that of Embodiment 1. A difference lies in that: a curved edge is used at an opening 10 of a front panel 11 to substitute a second upper edge, a second lower edge and a second side edge.

Specifically, referring to FIG. 7, an opening of a door housing 1 includes four edges forming a close loop, where a first upper edge 101, a first lower edge 102 and a first side edge 103 which connects the first upper edge 101 and the first lower edge 102 are located on a side panel 12, a first curved side edge 107 is located on the front panel 11, one end of the first curved side edge 107 is connected to the first upper edge 101, and the other end is connected to the first lower edge 102. The first upper edge 101, the first lower edge 102, the first side edge 103 and the first curved side edge 107 are all provided with projecting tongues 13.

Accordingly, as shown in FIG. 8, a recessed groove 20 of a door handle 2 also has four edges, which are respectively corresponding to the first upper edge 101, the first lower edge 102, the first side edge 103 and the first curved side edge 107, and the flange 21 on each edge has a groove 22.

The projecting tongues 13 and the grooves 22 that are along the first upper edge 101, the first lower edge 102, and the first side edge 103 restrict the door handle 2 from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the side panel 12, and the projecting tongue 13 and the groove 22 that are along the first curved side edge 107 restrict the door handle 2 from moving in a depth direction in a third dimension of an orthogonal coordinate system.

In another embodiment, the following two solutions may also be used to limit the door handle 2 in a three-dimensional coordinate system. Solution (a): the projecting tongues 13 are only disposed along the first upper edge 101, the first side edge 103, and the first curved side edge 107, the projecting tongues 13 and the grooves 22 that are along the first upper edge 101 and the first side edge 103 restrict the door handle 2 from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the side panel 12, and the projecting tongue 13 and the groove 22 that are along the first curved side edge 107 restrict the door handle 2 from moving in a depth direction in a third dimension of an orthogonal coordinate system. Solution (b): the projecting tongues 13 are only disposed along the first lower edge 102, the first side edge 103, and the first curved side edge 107, the projecting tongues 13 and the grooves 22 that are along the first lower edge 102 and first side edge 103 restrict the door handle 2 from moving in a height direction and a length direction in two perpendicular dimensions of a surface of the side panel 12, and the projecting tongue 13 and the groove 22 that are along the first curved side edge 107 restrict the door handle 2 from moving in a depth direction in a third dimension of an orthogonal coordinate system.

In the present invention, each embodiment mainly describes differences from the forgoing embodiment, and for identical same or similar structures in each embodiment, refer to an identical or similar part of the forgoing embodiment.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.