Sheet metal box structure and home appliances

Abstract

This utility model relates to a sheet metal box structure and a household appliance product, belonging to the field of household appliances. The sheet metal box structure includes: a box body structure, which has a receiving cavity and an opening communicating with the receiving cavity, and a second mounting hole; a cover structure, which is disposed on the box body structure and located at the opening, and has a first communicating gap or the cover structure and the box body structure enclosing and forming a first communicating gap, the first communicating gap communicating with the receiving cavity, and the cover structure having a first mounting hole, which is opposite to a second mounting hole; and fasteners, which are disposed on the box body structure and / or the cover structure, and the fasteners respectively cooperate with the first mounting hole and the second mounting hole. The sheet metal box structure disclosed in this application, by forming a first communicating gap through the enclosure of the box body structure and the cover structure, enables the heat of electronic components in the receiving cavity to be dissipated efficiently, improving the problem of insufficient heat dissipation performance of traditional sheet metal box structures.

Description

Technical Field

[0001] This utility model relates to the field of home appliance products, and in particular to a sheet metal box structure and a home appliance product. Background Technology

[0002] Traditional sheet metal enclosures typically consist of a box body and a cover, fastened together with fasteners such as screws and bolts to enclose and protect internal electronic components or other equipment. However, traditional sheet metal enclosures often lack dedicated heat dissipation structures or have ineffective heat dissipation features, which can negatively impact the lifespan of internal electronic components over time. Therefore, improvements are needed to address the shortcomings of traditional sheet metal enclosure structures. Utility Model Content

[0003] Therefore, it is necessary to provide a sheet metal box structure and home appliance product to address the problem that traditional sheet metal box structures lack a dedicated heat dissipation structure or have poor heat dissipation function, which can easily affect the lifespan of electronic components inside the sheet metal box after long-term use.

[0004] A sheet metal box structure includes: a box body structure having a receiving cavity and an opening communicating with the receiving cavity, and a second mounting hole; a cover structure disposed on the box body structure and located at the opening, the box body structure having a first communicating gap or the cover structure and the box body structure enclosing and forming a first communicating gap, the first communicating gap communicating with the receiving cavity, the cover structure having a first mounting hole, the first mounting hole and the second mounting hole being oppositely disposed; and fasteners disposed on the box body structure and / or the cover structure, the fasteners respectively cooperating with the first mounting hole and the second mounting hole, the fasteners being used to fix the cover structure and the box structure.

[0005] The first aspect of this application discloses a sheet metal box structure. The box structure includes a cavity to house electronic components, protecting them from external factors that could cause malfunctions. The box structure and the cover structure enclose a first communicating gap with the cavity, allowing for more efficient heat dissipation from the electronic components through airflow, thus overcoming the insufficient heat dissipation performance of traditional sheet metal box structures. This design ensures structural stability while optimizing the heat dissipation path, preventing heat accumulation and maintaining stable operation of the electronic components. The cover structure is fixedly connected to the box structure with fasteners, ensuring a secure assembly and preventing loosening due to vibration or external forces, further enhancing the overall protective performance. This sheet metal box structure provides excellent protection while also addressing heat dissipation requirements, making it suitable for applications with high demands for both heat dissipation and sealing.

[0006] In one embodiment, the first connecting gap extends along the length of the housing structure. By extending the first connecting gap along the length of the housing structure, the heat dissipation area is effectively increased, allowing heat generated by the electronic components within the cavity to be evenly dissipated along the length, preventing heat accumulation within the cavity. This design significantly improves heat dissipation performance while maintaining a simple and reliable structure, making it highly practical.

[0007] In one embodiment, a first thread is formed on the fastener, and the depth of the second mounting hole is twice the pitch of the first thread. Effective thread engagement is achieved by the second mounting hole being twice the pitch of the first thread. This structure ensures that the fastener can fully lock the cover structure and the box structure, avoiding the risk of loosening due to insufficient thread engagement, while also guaranteeing smooth assembly. By precisely controlling the ratio of thread depth to pitch, assembly efficiency is optimized while maintaining connection strength, thus improving the overall structural reliability.

[0008] In one embodiment, the depth of the second mounting hole is 2.5 mm. It can be manufactured by molding to create a second mounting hole with a certain depth to ensure stable assembly. For example, a depth of 2.5 mm ensures stable locking of the cover and box structures, avoiding the risk of loosening due to insufficient thread engagement and improving reliability.

[0009] In one embodiment, the box structure has a second connecting gap extending along the height direction of the box structure and communicating with the receiving cavity. This second connecting gap, extending along the height direction and communicating with the receiving cavity, forms a vertical heat dissipation channel. This design, based on the original length-direction heat dissipation, adds a height-direction heat dissipation path, allowing hot air to rise and be expelled more effectively through natural convection, thus improving the heat dissipation effect. Furthermore, it fully considers the characteristics of sheet metal processing, employing a simple bending process, ensuring both heat dissipation effect and production convenience.

[0010] In one embodiment, there are multiple second connecting gaps, which are spaced apart circumferentially along the housing structure and all communicate with the receiving cavity. By arranging multiple second connecting gaps circumferentially along the housing structure, a surrounding heat dissipation channel layout is formed. This multi-channel design significantly increases the heat dissipation area, allowing heat within the receiving cavity to be evenly dissipated from multiple directions, effectively preventing localized overheating. This design achieves a more balanced and efficient heat dissipation effect while ensuring structural reliability.

[0011] In one embodiment, the box structure includes a sheet metal box body and a protruding structure. The cover structure is disposed on the sheet metal box body, which has the receiving cavity and the opening. The protruding structure is disposed on the sheet metal box body, and the protruding structure and the sheet metal box body enclose each other to form the second assembly hole. By providing a protruding structure on the sheet metal box body, which encloses the second assembly hole, this one-piece molding design replaces the traditional riveting and drilling process. This design simplifies the processing flow, avoids the additional costs and production complexity brought by the riveting process, and ensures the accuracy and strength of the second assembly hole. Furthermore, it reduces the manufacturing difficulty of sheet metal parts and reduces material control costs and labor costs.

[0012] In one embodiment, the protruding structure includes a first protrusion disposed on the sheet metal housing, the first protrusion and the sheet metal housing enclosing each other to form the second assembly hole. By forming the second assembly hole with the first protrusion and the sheet metal housing, the processing steps of traditional riveting are avoided, simplifying the production process and improving processing efficiency. This design, while meeting assembly requirements, optimizes the production process and reduces manufacturing costs.

[0013] In one embodiment, the protruding structure includes a second protrusion disposed on the sheet metal housing, located between the sheet metal housing and the cover structure, and the second protrusion and the sheet metal housing together form the second assembly hole. By positioning the second protrusion between the sheet metal housing and the cover structure, the area of ​​the first connecting gap can be increased while meeting assembly requirements, thus improving heat dissipation.

[0014] In one embodiment, there are multiple protruding structures, all of which are disposed on the sheet metal housing and spaced apart circumferentially along the sheet metal housing. This arrangement of multiple protruding structures on the sheet metal housing and spaced apart circumferentially creates a uniformly distributed assembly point layout. This design significantly enhances the connection strength between the cover structure and the housing structure, making the overall assembly more stable and reliable.

[0015] In one embodiment, a second thread is formed on the fastener, and the thickness of the protrusion is 0.8 times the pitch of the second thread. By setting the thickness of the protrusion to 0.8 times the pitch of the second thread, the strength and rigidity of the protrusion are ensured, preventing damage. Furthermore, it ensures that the fastener can be fully tightened, avoiding the risk of loosening due to insufficient thread engagement.

[0016] In one embodiment, the thickness of the protrusion is 1 mm. This 1 mm thickness ensures both structural strength and assembly reliability. Furthermore, it replaces traditional riveting, making assembly simpler and more convenient.

[0017] In one embodiment, the sheet metal box includes a support portion, a first bent portion, and a second bent portion. Both the first bent portion and the second bent portion are disposed on the support portion, and are alternately arranged along the circumference of the support portion. The support portion, the first bent portion, and the second bent portion enclose the receiving cavity and the first communicating gap. A second communicating gap is formed between the first bent portion and the second bent portion, and the second communicating gap communicates with the receiving cavity. By forming a second communicating gap between the first bent portion and the second bent portion, the heat dissipation path is increased while ensuring structural strength, achieving multi-directional heat dissipation and improving heat dissipation efficiency.

[0018] In one embodiment, the second bending portion includes a bending portion body and a flange portion. The bending portion body is disposed on the support portion, and the flange portion is disposed on the support portion and located on the side of the support portion away from the bending portion body. A protruding structure is disposed on the flange portion, and the protruding structure and the flange portion enclose to form the second mounting hole. By disposing of the protruding structure on the flange portion, the flange portion and the cover structure are engaged by fasteners, resulting in better assembly reliability and stability.

[0019] A household appliance product includes: the aforementioned sheet metal box structure.

[0020] The second aspect of this application discloses a household appliance product that, through the design of a sheet metal box structure, provides a reliable protective space for the electronic components of the appliance and ensures that the heat from the electronic components can be quickly dissipated during prolonged operation. This design ensures the heat dissipation efficiency of the appliance and guarantees its service life. Attached Figure Description

[0021] Figure 1 This is a first perspective view of the sheet metal box structure.

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a second perspective view of the sheet metal box structure;

[0024] Figure 4 for Figure 3 Enlarged view at point B in the middle;

[0025] Figure 5This is a third-dimensional view of the sheet metal box structure.

[0026] Figure 6 This is a sectional view of the sheet metal box structure;

[0027] Figure 7 for Figure 6 Enlarged view at point C;

[0028] Figure 8 This is an exploded view of the sheet metal box structure;

[0029] Figure 9 This is a first perspective view of the box structure;

[0030] Figure 10 This is a second perspective view of the box structure.

[0031] The correspondence between the reference numerals and the component names is as follows:

[0032] 1 Box structure, 11 Sheet metal box body, 111 Support part, 112 First bending part, 113 Second bending part, 1131 Bending part body, 1132 Flanged part, 12 Protruding structure, 121 First protruding part, 101 Receiving cavity, 102 Opening, 103 Second assembly hole, 104 First connecting gap, 105 Second connecting gap;

[0033] 2. Cover structure, 201 First assembly hole;

[0034] 3. Fasteners. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0037] Example 1

[0038] like Figure 1-10As shown, this embodiment discloses a sheet metal box structure, including: a box body structure 1, the box body structure 1 having a receiving cavity 101, the box body structure 1 having an opening 102 communicating with the receiving cavity 101, and the box body structure 1 having a second mounting hole 103; a cover structure 2, the cover structure 2 being disposed on the box body structure 1 and located at the opening 102, the box body structure 1 having a first communicating gap 104 or the cover structure 2 and the box body structure 1 enclosing to form a first communicating gap 104, the first communicating gap 104 communicating with the receiving cavity 101, the cover structure 2 having a first mounting hole 201, the first mounting hole 201 and the second mounting hole 103 being disposed opposite to each other; and a fastener 3, the fastener 3 being disposed on the box body structure 1 and / or the cover structure 2, the fastener 3 cooperating with the first mounting hole 201 and the second mounting hole 103 respectively, the fastener 3 being used to fix the cover structure 2 and the box structure 1.

[0039] The first aspect of this application discloses a sheet metal box structure. The receiving cavity 101 of the box structure 1 can accommodate electronic components, protecting them and preventing malfunctions due to external factors. The box structure 1 and the cover structure 2 enclose a first communicating gap 104 that communicates with the receiving cavity 101, allowing for more efficient heat dissipation from the electronic components within the cavity through airflow, thus improving the insufficient heat dissipation performance of traditional sheet metal box structures. This design ensures structural stability while optimizing the heat dissipation path, preventing heat accumulation and maintaining stable operation of the electronic components. The cover structure 2 is fixedly connected to the box structure 1 by fasteners 3, ensuring assembly firmness and preventing loosening due to vibration or external forces, further enhancing the overall protective performance. The sheet metal box structure of this application provides good protection while also addressing heat dissipation requirements, making it suitable for applications with high demands for both heat dissipation and sealing.

[0040] like Figure 1 , Figure 3 and Figure 5 As shown, in addition to the features of the above embodiments, this embodiment further specifies that the first connecting gap 104 extends along the length direction of the housing structure 1. By extending the first connecting gap 104 along the length direction of the housing structure 1, the heat dissipation area is effectively increased, allowing the heat generated by the electronic components in the receiving cavity 101 to be evenly dissipated along the length direction, preventing heat accumulation in the receiving cavity 101. This design significantly improves heat dissipation performance while maintaining a simple and reliable structure, and is highly practical.

[0041] In addition to the features of the above embodiments, this embodiment further specifies that: a first thread is formed on the fastener 3, and the depth of the second mounting hole 103 is twice the pitch of the first thread. Effective thread engagement is achieved by the second mounting hole 103 being twice the pitch of the first thread. This structure ensures that the fastener 3 can completely lock the cover structure 2 and the box structure 1, avoiding the risk of loosening due to insufficient thread engagement, and also guarantees smooth assembly. By precisely controlling the ratio of thread depth to pitch, assembly efficiency is optimized while maintaining connection strength, thus improving the overall structural reliability.

[0042] In addition to the features of the above embodiments, this embodiment further specifies that the depth of the second mounting hole 103 is 2.5 mm. It can be manufactured by mold pressing to form a second mounting hole 103 with a certain depth to ensure stable assembly. For example, the depth of the second mounting hole 103 is 2.5 mm, ensuring stable locking of the cover structure 2 and the box structure 1, avoiding the risk of loosening due to insufficient thread engagement, and improving reliability.

[0043] like Figure 1-5 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the box structure 1 is provided with a second connecting gap 105, the second connecting gap 105 extends along the height direction of the box structure 1, and the second connecting gap 105 communicates with the receiving cavity 101. By extending along the height direction and communicating with the receiving cavity 101 through the second connecting gap 105, a vertical heat dissipation channel is formed. This design adds a heat dissipation path in the height direction on the basis of the original length-direction heat dissipation, allowing hot air to rise and be discharged more effectively through natural convection, thus improving the heat dissipation effect. Moreover, it fully considers the characteristics of sheet metal processing, and can be achieved using a simple bending process, ensuring both heat dissipation effect and production convenience.

[0044] like Figure 1-5 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the number of second connecting gaps 105 is multiple, and the multiple second connecting gaps 105 are arranged at intervals along the circumference of the box structure 1, and all of the multiple second connecting gaps 105 are connected to the receiving cavity 101. By arranging multiple second connecting gaps 105 at intervals along the circumference of the box structure 1, a surrounding heat dissipation channel layout is formed. This multi-channel design significantly increases the heat dissipation area, allowing the heat in the receiving cavity 101 to be evenly dissipated from multiple directions, effectively avoiding local overheating. This design achieves a more balanced and efficient heat dissipation effect while ensuring structural reliability.

[0045] like Figure 5 and Figure 6As shown, in addition to the features of the above embodiments, this embodiment further defines: the box structure 1 includes a sheet metal box body 11 and a protruding structure 12, the cover structure 2 is disposed on the sheet metal box body 11, the sheet metal box body 11 has the receiving cavity 101 and the opening 102, the protruding structure 12 is disposed on the sheet metal box body 11, and the protruding structure 12 and the sheet metal box body 11 enclose to form the second assembly hole 103. By providing the protruding structure 12 on the sheet metal box body 11, and the protruding structure 12 and the sheet metal box body 11 enclosing to form the second assembly hole 103, this one-piece molding design replaces the traditional riveting and drilling process. This design simplifies the processing flow, avoids the additional costs and production complexity brought by the riveting process, and at the same time ensures the accuracy and strength of the second assembly hole 103. Moreover, it reduces the manufacturing difficulty of sheet metal parts and reduces material control costs and labor costs.

[0046] like Figure 7 and Figure 10 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the protruding structure 12 includes a first protrusion 121, which is disposed on the sheet metal box 11, and the first protrusion 121 and the sheet metal box 11 enclose to form the second assembly hole 103. By forming the second assembly hole 103 by the first protrusion 121 and the sheet metal box 11 enclosing each other, the processing steps of the traditional riveting process can be avoided, simplifying the production process and improving processing efficiency. This design optimizes the production process and reduces manufacturing costs while meeting assembly requirements.

[0047] In addition to the features of the above embodiments, this embodiment further specifies that: the protruding structure 12 includes a second protrusion, which is disposed on the sheet metal housing 11 and located between the sheet metal housing 11 and the cover structure 2. The second protrusion and the sheet metal housing 11 enclose and form the second assembly hole 103. By positioning the second protrusion between the sheet metal housing 11 and the cover structure 2, the area of ​​the first connecting gap 104 can be increased while meeting assembly requirements, thereby improving heat dissipation.

[0048] like Figure 5 and Figure 10 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the number of protruding structures 12 is multiple, and the multiple protruding structures 12 are all disposed on the sheet metal box body 11 and spaced apart along the circumference of the sheet metal box body 11. By distributing multiple protruding structures 12 on the sheet metal box body 11 and spaced apart along the circumference of the sheet metal box body 11, a uniformly distributed assembly point layout is formed. This design significantly enhances the connection strength between the cover structure 2 and the box structure 1, making the overall assembly more stable and reliable.

[0049] In addition to the features of the above embodiments, this embodiment further specifies that: a second thread is formed on the fastener 3, and the thickness of the protrusion structure 12 is 0.8 times the pitch of the second thread. By setting the thickness of the protrusion structure 12 to 0.8 times the pitch of the second thread, the strength and rigidity of the protrusion structure 12 are ensured, preventing damage. Furthermore, it ensures that the fastener 3 can be fully locked, avoiding the risk of loosening due to insufficient thread engagement.

[0050] In addition to the features of the above embodiments, this embodiment further specifies that the thickness of the protruding structure 12 is 1 mm. By having the protruding structure 12 have a thickness of 1 mm, this design ensures both the structural strength of the protruding structure 12 and assembly reliability. Furthermore, it can replace traditional riveting, making assembly simpler and more convenient.

[0051] like Figure 8-10 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the sheet metal box 11 includes a support portion 111, a first bent portion 112, and a second bent portion 113. Both the first bent portion 112 and the second bent portion 113 are disposed on the support portion 111. The first bent portion 112 and the second bent portion 113 are alternately arranged along the circumference of the support portion 111. The support portion 111, the first bent portion 112, and the second bent portion 113 enclose and form the receiving cavity 101 and the first communicating gap 104. A second communicating gap 105 is formed between the first bent portion 112 and the second bent portion 113, and the second communicating gap 105 communicates with the receiving cavity 101. By forming the second communicating gap 105 between the first bent portion 112 and the second bent portion 113, the heat dissipation path is increased while ensuring structural strength, achieving multi-directional heat dissipation and improving heat dissipation efficiency.

[0052] like Figure 8-10 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the second bending portion 113 includes a bending portion body 1131 and a flange portion 1132. The bending portion body 1131 is disposed on the support portion 111, and the flange portion 1132 is disposed on the support portion 111 and located on the side of the support portion 111 away from the bending portion body 1131. The protruding structure 12 is disposed on the flange portion 1132, and the protruding structure 12 and the flange portion 1132 enclose each other to form the second mounting hole 103. By disposing of the protruding structure 12 on the flange portion 1132, the flange portion 1132 and the cover structure 2 are engaged by fasteners 3, resulting in better assembly reliability and stability.

[0053] Example 2

[0054] This embodiment discloses a home appliance product, including the above-mentioned sheet metal box structure.

[0055] The second aspect of this application discloses a household appliance product that, through the design of a sheet metal box structure, provides a reliable protective space for the electronic components of the appliance and ensures that the heat from the electronic components can be quickly dissipated during prolonged operation. This design ensures the heat dissipation efficiency of the appliance and guarantees its service life.

[0056] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A sheet metal box structure, characterized in that, include: The box structure (1) has a receiving cavity (101), an opening (102) communicating with the receiving cavity (101), and a second assembly hole (103). A cover structure (2) is disposed on the box structure (1) and located at the opening (102). The box structure (1) is provided with a first communicating gap (104) or the cover structure (2) and the box structure (1) enclose to form a first communicating gap (104). The first communicating gap (104) communicates with the receiving cavity (101). The cover structure (2) is provided with a first assembly hole (201). The first assembly hole (201) and the second assembly hole (103) are arranged opposite to each other. Fastener (3) is provided on the box structure (1) and / or the cover structure (2). The fastener (3) cooperates with the first mounting hole (201) and the second mounting hole (103) respectively. The fastener (3) is used to fix the cover structure (2) and the box structure (1).

2. The sheet metal box structure according to claim 1, characterized in that, The first connecting gap (104) extends along the length direction of the box structure (1); A first thread is formed on the fastener (3), and the depth of the second mounting hole (103) is twice the pitch of the first thread; And / or the depth of the second mounting hole (103) is 2.5 mm.

3. The sheet metal box structure according to claim 1, wherein The box structure (1) is provided with a second connecting gap (105), which extends along the height direction of the box structure (1) and communicates with the receiving cavity (101).

4. The sheet metal box structure according to claim 3, wherein There are multiple second connecting gaps (105), and the multiple second connecting gaps (105) are arranged at intervals along the circumference of the box structure (1), and all the multiple second connecting gaps (105) are connected to the receiving cavity (101).

5. The sheet metal box structure according to claim 1, wherein The box structure (1) includes a sheet metal box body (11) and a protruding structure (12). The cover structure (2) is disposed on the sheet metal box body (11). The sheet metal box body (11) is provided with the receiving cavity (101) and the opening (102). The protruding structure (12) is disposed on the sheet metal box body (11). The protruding structure (12) and the sheet metal box body (11) enclose each other to form the second assembly hole (103).

6. The sheet metal box structure according to claim 5, characterized in that, The protruding structure (12) includes a first protruding part (121), which is disposed on the sheet metal box (11). The first protruding part (121) and the sheet metal box (11) surround each other to form the second assembly hole (103). And / or the protruding structure (12) includes a second protrusion, the second protrusion is disposed on the sheet metal box (11), the second protrusion is located between the sheet metal box (11) and the cover structure (2), and the second protrusion and the sheet metal box (11) enclose to form the second mounting hole (103). And / or the number of the protruding structures (12) is multiple, and the multiple protruding structures (12) are all disposed on the sheet metal box (11) and are spaced apart along the circumference of the sheet metal box (11).

7. The sheet metal box structure according to claim 5, characterized in that, A second thread is formed on the fastener (3), and the thickness of the protrusion structure (12) is 0.8 times the pitch of the second thread; And / or the thickness of the protrusion structure (12) is 1 mm.

8. The sheet metal box structure according to claim 5, wherein The sheet metal box body (11) includes a support part (111), a first bending part (112) and a second bending part (113). The first bending part (112) and the second bending part (113) are both disposed on the support part (111). The first bending part (112) and the second bending part (113) are alternately disposed along the circumference of the support part (111). The support part (111), the first bending part (112) and the second bending part (113) enclose and form the receiving cavity (101) and the first communicating gap (104). A second communicating gap (105) is formed between the first bending part (112) and the second bending part (113). The second communicating gap (105) communicates with the receiving cavity (101).

9. The sheet metal box structure according to claim 8, wherein The second bending portion (113) includes a bending portion body (1131) and a flange portion (1132). The bending portion body (1131) is disposed on the support portion (111). The flange portion (1132) is disposed on the support portion (111) and located on the side of the support portion (111) away from the bending portion body (1131). The protruding structure (12) is disposed on the flange portion (1132). The protruding structure (12) and the flange portion (1132) enclose each other to form the second mounting hole (103).

10. An electric home appliance characterized by comprising: include: The sheet metal box structure as described in any one of claims 1-9.

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