A hollowed-out metal watch case structure

Abstract

This utility model relates to a hollowed-out metal watch case structure in the field of watch technology, including a case and connecting protrusions. The case has a hollowed-out layer in the middle for assisting heat dissipation. The hollowed-out layer penetrates the middle of the case and is flush with the surface of the case. The hollowed-out layer has a support structure arranged in a cross-support configuration inside. This structure achieves a balance between lightweight and high strength. By removing material from non-critical areas in the middle of the case, the overall weight is significantly reduced, forming the hollowed-out layer. This structure can significantly reduce the burden of wearing the watch. The hollowed-out design can reduce the weight by 20%-40%, improving the comfort of wearing it for a long time. It is manufactured using 3D printing technology in a one-piece molding process. The internal columnar / truss support and hollowed-out heat dissipation channel design are optimized to achieve a synergistic improvement in lightweight, high strength and efficient heat dissipation. It is suitable for smartwatches, mechanical watches and other high-heat-generating watch products. While reducing weight, it also plays a role in active heat dissipation and visual transparency, preventing the movement from overheating.

Description

Technical Field

[0001] This utility model relates to the field of watch technology, and in particular to a hollowed-out metal watch case structure. Background Technology

[0002] The watch case is the main structural component of a watch, undertaking multiple core functions such as load-bearing, protection, connection, and aesthetic display. It is the outermost physical framework of the entire watch. However, existing metal watch cases, especially those made of stainless steel and titanium alloys, are mostly solid or near-solid structures, resulting in high overall density and weight. This design leads to a noticeable burden when wearing the watch, and prolonged wear can easily cause wrist fatigue, especially for large-sized or sports watches. Furthermore, the structural design is unreasonable, and the material utilization rate is low. Traditional watch case designs are mostly flat structures of uniform thickness, without fully considering the actual distribution of mechanical loads. Their manufacturing mainly relies on machining (CNC) or stamping. These processes have significant limitations when manufacturing complex internal support structures, such as three-dimensional trusses, intersecting columns, and openwork channels, resulting in serious material waste. Too much material is used in non-critical load-bearing areas, while key connection points are not specifically reinforced. The structural stress mode is flat, which makes the overall rigidity insufficient when subjected to bending or torsional forces, making it prone to deformation and resulting in low structural efficiency.

[0003] On the other hand, although metal is a good conductor of heat, traditional solid watch cases have a small contact area with the air, and heat is mainly dissipated slowly through the surface of the case, resulting in low heat dissipation efficiency. For smartwatches, the processor and battery generate heat, or complex mechanical watches generate heat through gear friction, and the accumulation of internal heat can lead to an increase in the movement temperature, which in turn affects the lifespan of electronic components or the timekeeping accuracy of the mechanical movement. To address this, the inventors have proposed a hollowed-out metal watch case structure to solve the aforementioned technical problem of balancing the high density of metal materials with lightweight wearability. Utility Model Content

[0004] In order to overcome the shortcomings mentioned above, the utility model aims to provide a technical solution that can solve the above problems.

[0005] A hollow metal watch case structure includes a shell and several connecting protrusions with raised structures. The connecting protrusions are respectively located at both ends of the shell and are integrally formed with the shell. The shell has a hollow layer in the middle for assisting heat dissipation. The hollow layer penetrates the middle of the shell and is flush with the surface of the shell. The hollow layer has a support structure arranged in a cross-support configuration inside. The above structure achieves a balance between lightweight and high strength. By removing material from non-critical areas in the middle of the case, the overall weight is significantly reduced, forming a hollow layer. An X-shaped skeleton is built within the hollow area as an internal reinforcing rib, supporting the main load. This structure can significantly reduce the burden of wearing the watch, achieving the effect of reducing the density of the case and the weight of a solid case. The hollow design can reduce the weight by 20%-40%, improving the comfort of wearing it for a long time. In addition, the cross-bracing structure transforms the original flat plate stress into frame stress, improving the shell's bending and torsional resistance, preventing deformation caused by external forces, increasing material utilization, and achieving the effect of being thicker at the edges and joints and thinner in the middle, achieving optimal performance with the least amount of material. This structure utilizes precision mechanical manufacturing and additive manufacturing 3D printing technologies. It is a metal watch case structure formed using selective laser melting (SLM) technology. Through optimized internal column / truss supports and hollowed-out heat dissipation channels, it achieves a synergistic improvement in lightweight design, high strength, and efficient heat dissipation. It is suitable for high-heat-generating watch products such as smartwatches and mechanical watches. The skeletonized layer not only reduces weight but also provides active heat dissipation and visual transparency. When the watch movement generates heat, the heat is conducted through the case. The skeletonized layer increases the contact area between the case and the air, creating a heat dissipation fin effect. This accelerates the dissipation of heat into the environment through convection and radiation, preventing the movement from overheating and affecting timekeeping accuracy. The cross structure can evenly distribute external impacts or pressures throughout the entire support area, avoiding stress concentration at a single point and resisting multi-directional loads. The X-shaped structure has good resistance to lateral, longitudinal, and torsional forces, and is more stable than a single-direction support bar. Furthermore, the complex cross structure can disrupt the vibration frequency, reduce resonance caused by external vibrations such as knocking or movement, protect the internal movement, and reduce the probability of movement damage caused by resonance.

[0006] Furthermore, the support structure includes an upper support truss, a middle first support truss, a middle second support truss, and a lower support truss, all of which abut against the inner surface of the hollow layer at both ends. Trusses are classic load-bearing structures in engineering. Through the combination of triangular or grid-like rigid members, maximum structural strength is achieved with minimal material weight. This product uses interconnected upper, middle, and lower support trusses to work together to form a three-dimensional support frame in the hollow layer. The evenly distributed trusses effectively support the inner wall of the hollow layer, preventing the thin-walled areas from denting or wrinkling under stress. By concentrating the support force on key support points rather than distributing it evenly throughout the shell, efficient load-bearing capacity is achieved. When subjected to impact, the force can be dispersed across the surface of the shell through this three-dimensional support frame, achieving both support and buffering effects.

[0007] Furthermore, the upper support truss, the middle first support truss, the middle second support truss, and the lower support truss are integrally formed with the shell. This structure utilizes additive manufacturing 3D printing technology and selective laser melting (SLM) technology to form the metal watch case structure. By optimizing the internal columnar / truss support and hollow heat dissipation channel design, it achieves a synergistic improvement in lightweight, high strength, and efficient heat dissipation. The integral forming structure is one of the key technical features of this hollow metal watch case design. This process fundamentally determines the structural strength of the product, improving upon traditional processes that use CNC cutting or casting for the watch case. These traditional processes struggle to achieve complex internal structures, such as irregularly shaped cooling channels and hollow weight-reduction designs, resulting in heavy watch cases or poor heat dissipation. Moreover, this process reduces the low material utilization rate and high cost associated with traditional processes, such as excessive cutting waste. Furthermore, traditional split structures rely on welding or bolting, and the connection points are high-risk areas for stress concentration and fatigue fracture. Integrated molding eliminates potential fracture sources, and external forces can be transmitted unimpeded from the shell to the supporting truss, and then distributed to the entire structure, forming the most efficient mechanical path and avoiding stress abrupt changes caused by connection gaps.

[0008] Furthermore, both the upper and lower support trusses are arranged in a cross-shaped linear pattern that tapers inward along the hollow layer, while the middle first and middle second support trusses are both inclined structures with opposite inclination angles. The upper and lower ends are arranged in a cross-shaped linear pattern to form a composite structure of arch and truss. The cross-shaped structure that tapers inward is an X-shaped truss. Its mechanical principle is similar to that of an arch bridge or space truss in architecture. When external forces are applied to the shell, the structure can convert tension into compression and efficiently transfer it to the support point along the diagonal path of the truss, thereby maximizing the compressive and bending resistance. When the cross structure is subjected to vertical loads, such as when the shell is squeezed, it can form bidirectional support to effectively resist the collapse of the shell. The arch effect can disperse concentrated stress and prevent local deformation. The opposite angles of the two mid-end inclined trusses achieve shear force balance and torsional stiffness. The two mid-end support trusses are inclined at opposite angles, such as one at +15° and the other at -15°, forming a V-shaped mechanical network. This design is specifically designed to resist shear force and torsional moment. When the case is subjected to lateral thrust, there will be a shear tendency for the upper and lower layers to shift. The oppositely inclined trusses can restrain each other. By pulling at one end and compressing at the other end, the shift between the upper and lower layers can be effectively prevented. When the case is torsion, such as when the wrist rotates while wearing it, the oppositely inclined trusses will be stretched and compressed at the same time, forming a strong internal moment to resist external torsion, making its torsional resistance far exceed that of parallel or single-inclined truss layouts.

[0009] Furthermore, the support structure includes a left-angled support column and a right-angled support column, which are arranged in an alternating structure inside the hollow layer. The alternating structure means that the left-angled support column is inclined to the upper left and the right-angled support column is inclined to the upper right, and they are staggered in the vertical direction to form a Z-shaped stepped three-dimensional layout. This arrangement combines multiple inclined support units into a continuous spatial force-bearing system to achieve maximum strength with minimal material. The left-hand inclined column primarily resists the tendency to bend to the right, while the right-hand inclined column resists the tendency to bend to the left. The two complement each other, ensuring that the shell remains stable under bending in any direction and enhancing structural redundancy. Even if one inclined column is damaged due to extreme conditions, the supporting columns on its opposite side and at staggered positions can still bear part of the load, providing fault tolerance and improving safety. Furthermore, this structure avoids the risk of resonance. Asymmetrical or unidirectional supports may induce resonance at specific frequencies, while the staggered left and right inclined columns have diverse natural frequencies, reducing the risk of resonance.

[0010] Furthermore, the connecting protrusion has a groove in the middle for installing the watch strap, and the surface of the connecting protrusion has a connecting hole for assisting in the installation of the watch strap fixing shaft. The connecting hole penetrates the surface of the connecting protrusion. The groove provides a relative installation position for the end of the watch strap, such as a metal link or a rubber / leather strap, ensuring that the watch strap is centered and symmetrical after installation. When the watch strap needs to be installed, the protrusion at one end of the watch strap is placed in the groove, and then the fixing shaft passes through the connecting hole in sequence through the connecting protrusion, the watch strap, and the groove, thereby forming a movable connection and completing the watch strap installation process.

[0011] Furthermore, the central part of the housing has a hollow mounting area for mounting the watch dial. When the watch dial needs to be installed, the inner wall of the mounting area fits tightly with the outer edge of the watch dial. An interference fit or a snap-fit ​​fit can be used to ensure that the watch dial does not shift or rotate after installation, thus limiting its position. After the watch dial is embedded, its edge is surrounded by the housing, forming a physical barrier and reducing the possibility of dust, fibers, and other foreign objects falling onto the surface of the watch dial.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. Achieving a balance between lightweight and high strength: By removing material from non-critical areas in the middle of the case, the overall weight is significantly reduced, creating a hollow layer. An X-shaped skeleton is constructed within the hollow area as an internal reinforcing rib, supporting the main load. This structure can significantly reduce the burden of wearing the watch, achieving the effect of reducing the density of the case and the weight of a solid case. The hollow design can reduce the weight by 20%-40%, improving the comfort of wearing it for a long time. 2. The cross-bracing structure transforms the original flat plate stress into frame stress, improving the shell's bending and torsional resistance, preventing deformation caused by external forces, increasing material utilization, and achieving the effect of being thicker at the edges and joints and thinner in the middle, achieving optimal performance with the least amount of material. 3. Utilizing 3D printing technology and selective laser melting (SLM) technology, the metal watch case structure is manufactured in a one-piece molding process. By optimizing the internal columnar / truss support and hollow heat dissipation channel design, it achieves a synergistic improvement in lightweight, high strength, and efficient heat dissipation. It is suitable for high heat-generating watch products such as smartwatches and mechanical watches, which not only reduces weight but also provides active heat dissipation and visual transparency, preventing the movement from overheating and affecting timekeeping accuracy. 4. It can evenly distribute external impacts or pressures to the entire support area, avoid stress concentration at a certain point, resist multi-directional loads, reduce resonance caused by external vibrations such as knocking or movement, protect the internal movement, and reduce the probability of movement damage caused by resonance. 5. The new integrated skeletonized support for the watch case is formed using SLM technology. While reducing weight, the impact resistance is improved through the truss structure, and the internal gap heat dissipation channels improve the heat dissipation efficiency of the movement. Attached Figure Description

[0013] Figure 1 This is a front view of a hollowed-out metal watch case structure; Figure 2 This is a rear view of a hollowed-out metal watch case structure; Figure 3 This is a right view of a hollowed-out metal watch case structure; Figure 4 This is a top view of a hollowed-out metal watch case structure; Figure 5 This is a three-dimensional diagram of a hollowed-out metal watch case structure; Figure 6 This is another perspective view of a hollowed-out metal watch case structure; In the diagram: 1. Shell - 2. Connecting protrusion - 3. Hollow layer - 4. Upper support truss - 5. Middle first support truss - 6. Middle second support truss - 7. Lower support truss - 8. Left diagonal support column - 9. Right diagonal support column - 10. Spacing - 11. Connecting hole - 12. Installation area - 13. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] For this embodiment, please refer to Figures 1-6The specific implementation of the hollow metal case structure includes a case 1 and a number of connecting protrusions 2 with a raised structure. The connecting protrusions 2 are respectively located at both ends of the case 1 and are integrally formed with the case 1. The middle part of the case 1 is provided with a hollow layer 3 for assisting heat dissipation. The hollow layer 3 penetrates the middle part of the case 1 and is flush with the surface of the case 1. The interior of the hollow layer 3 is provided with a support structure arranged in a cross-support configuration. The above structure achieves a balance between lightweight and high strength. By removing material from the non-critical areas in the middle of the case 1, the overall weight is significantly reduced, forming a hollow layer 3. An X-shaped skeleton is constructed within the hollow area as an internal reinforcing rib, which is a supporting structure that bears the main load. This structure can significantly reduce the burden of wearing the watch and reduce the density of the case 1, which is high and the solid case is heavy. The hollow design can reduce the weight by 20%-40% and improve the comfort of wearing it for a long time. In addition, the cross-bracing structure transforms the original flat plate stress into frame stress, improving the bending and torsional resistance of shell 1, preventing deformation caused by external forces, increasing material utilization, achieving the effect of thicker edges and joints and thinner middle, and achieving optimal performance with the least amount of material. This structure utilizes precision mechanical manufacturing and additive manufacturing 3D printing technologies. It is a metal watch case structure formed using selective laser melting (SLM) technology. Through optimized internal column / truss supports and hollowed-out heat dissipation channels, it achieves a synergistic improvement in lightweight design, high strength, and efficient heat dissipation. It is suitable for high-heat-generating watch products such as smartwatches and mechanical watches. The skeletonized layer 3 not only reduces weight but also provides active heat dissipation and visual transparency. When the watch movement generates heat, the heat is conducted through the case 1. The skeletonized layer 3 increases the contact area between the case 1 and the air, creating a heat dissipation fin effect. This accelerates the dissipation of heat into the environment through convection and radiation, preventing the movement from overheating and affecting timekeeping accuracy. The cross structure can evenly distribute external impacts or pressures throughout the entire support area, avoiding stress concentration at a single point and resisting multi-directional loads. The X-shaped structure has good resistance to lateral, longitudinal, and torsional forces, and is more stable than a single-direction support bar. Furthermore, the complex cross structure can disrupt the vibration frequency, reduce resonance caused by external vibrations such as knocking or movement, protect the internal movement, and reduce the probability of movement damage caused by resonance.

[0016] The supporting structure includes an upper supporting truss 4, a middle first supporting truss 5, a middle second supporting truss 6, and a lower supporting truss 7, all of which abut against the inner surface of the hollow layer 3 at both ends. Trusses are classic load-bearing structures in engineering. Through the combination of triangular or grid-like rigid members, they achieve maximum structural strength with minimal material weight. This product uses upper, middle, and lower supporting trusses that are interconnected and work together to form a three-dimensional supporting frame in the hollow layer 3. The evenly distributed trusses effectively support the inner wall of the hollow layer 3, preventing the thin-walled areas from denting or wrinkling under stress. By concentrating the supporting force on key support points rather than distributing it evenly throughout the shell 1, efficient load-bearing capacity is achieved. When subjected to impact, the force can be dispersed across the surface of the shell 1 through this three-dimensional supporting frame, achieving both support and buffering effects.

[0017] The upper support truss 4, the middle first support truss 5, the middle second support truss 6, and the lower support truss 7 are integrally formed with the shell 1. This structure adopts additive manufacturing 3D printing technology and selective laser melting (SLM) technology to form the metal watch case structure. By optimizing the internal columnar / truss support and hollow heat dissipation channel design, it achieves a synergistic improvement in lightweight, high strength, and efficient heat dissipation. The integral forming structure is one of the key technical features of this hollow metal watch case design. The adoption of this process fundamentally determines the structural strength of the product. It improves upon the traditional process of using CNC cutting or casting for the watch case, which makes it difficult to achieve complex internal structures, such as irregular cooling channels and hollow weight reduction designs, resulting in a heavy watch case or poor heat dissipation performance. Furthermore, the process adopted in this case reduces the problem of low material utilization and high cost caused by excessive cutting waste in traditional processes. Furthermore, traditional split structures rely on welding or bolting, and the connection points are high-risk areas for stress concentration and fatigue fracture. Integrated molding eliminates potential fracture sources, and external forces can be transmitted unimpeded from the shell 1 to the supporting truss, and then distributed to the entire structure, forming the most efficient mechanical path and avoiding stress abrupt changes caused by connection gaps.

[0018] The upper support truss 4 and the lower support truss 7 are both intersecting linear arrangements that taper inward along the hollow layer 3. The middle first support truss 5 and the middle second support truss 6 are both inclined structures with opposite inclination angles. The upper and lower ends are arranged in a cross-shaped linear pattern to form a composite structure of arch and truss. The cross-shaped structure that tapers inward is an X-shaped truss. Its mechanical principle is similar to that of an arch bridge or space truss in architecture. When external forces are applied to shell 1, the structure can convert tension into compression and efficiently transfer it to the support point along the diagonal path of the truss, thereby maximizing the compressive and bending resistance. When the cross structure is subjected to vertical loads, such as when the shell is squeezed, it can form bidirectional support to effectively resist the collapse of shell 1. The arch effect can disperse concentrated stress and prevent local deformation. The opposite angles of the two mid-end inclined trusses achieve shear force balance and torsional stiffness. The two mid-end support trusses are inclined at opposite angles, such as one at +15° and the other at -15°, forming a V-shaped mechanical network. This design is specifically designed to resist shear force and torsional moment. When the case 1 is subjected to lateral thrust, it will generate a shear tendency of upper and lower layers to shift. The oppositely inclined trusses can restrain each other. By pulling at one end and compressing at the other end, the shift of upper and lower layers can be effectively prevented. When the case is torsion, such as when the wrist rotates during wear, the oppositely inclined trusses will be stretched and compressed at the same time, forming a strong internal moment to resist external torsion, making its torsional resistance far exceed that of parallel or single-inclined truss layouts.

[0019] The support structure includes a left inclined support column 8 and a right inclined support column 9. The left inclined support column 8 and the right inclined support column 9 are arranged in an alternating structure inside the hollow layer 3. The alternating structure means that the left inclined support column 8 is inclined to the upper left and the right inclined support column 9 is inclined to the upper right, and they are staggered in the vertical direction to form a Z-shaped stepped three-dimensional layout. This arrangement combines multiple inclined support units into a continuous spatial force system to achieve maximum strength with minimal material. The left inclined column mainly resists the bending tendency to the right, while the right inclined column resists the bending tendency to the left. The two complement each other, so that the shell 1 remains stable under bending in any direction, enhancing the structural redundancy. Even if a certain inclined column is damaged due to extreme conditions, the supporting columns on its opposite side and at the staggered position can still bear part of the load, providing fault tolerance and improving safety. Moreover, this structure can avoid the risk of resonance. Asymmetrical or unidirectional support may cause resonance at a specific frequency, while the staggered left and right inclined columns have diverse natural frequencies, reducing the risk of resonance.

[0020] The connecting protrusion 2 has a groove 10 in the middle for installing the watch strap. The surface of the connecting protrusion 2 has a connecting hole 11 for assisting in the installation of the watch strap fixing shaft. The connecting hole 11 penetrates the surface of the connecting protrusion 2. The groove 10 provides a relative installation position for the end of the watch strap, such as a metal link or a rubber / leather strap, ensuring that the watch strap is centered and symmetrical after installation. When the watch strap needs to be installed, the protrusion at one end of the watch strap is placed in the groove 10, and then the fixing shaft passes through the connecting hole 11 in sequence through the connecting protrusion 2, the watch strap and the groove 10, thereby forming a movable connection and completing the watch strap installation process.

[0021] The housing 1 has a hollow mounting area 12 in the middle, which is used to mount the watch dial. When the watch dial needs to be mounted, the inner wall of the mounting area 12 fits tightly with the outer edge of the watch dial. An interference fit or a snap-fit ​​fit can be used to ensure that the watch dial does not shift or rotate after installation, thus limiting its position. After the watch dial is embedded, its edge is surrounded by the housing 1, forming a physical barrier and reducing the possibility of dust, fibers and other foreign objects falling onto the surface of the watch dial.

[0022] The key design features of this invention are: achieving a balance between lightweight and high strength through the above structure; significantly reducing the overall weight by removing material from the non-critical area in the middle of the casing 1, forming a hollow layer 3; constructing an X-shaped skeleton within the hollow area as an internal reinforcing rib and supporting structure to bear the main load; this structure can significantly reduce the burden of wearing, achieving the effect of reducing the density of the casing 1 and the weight of a solid watch case; the hollow design can reduce the weight by 20%-40%, improving the comfort of wearing for a long time. The cross-bracing structure transforms the original flat plate stress into frame stress, improving the bending and torsional resistance of shell 1, preventing deformation caused by external forces, increasing material utilization, and achieving the effect of being thicker at the edges and joints and thinner in the middle, achieving optimal performance with the least amount of material. Using 3D printing technology and selective laser melting (SLM) technology, the metal watch case structure is manufactured in one piece. By optimizing the internal column / truss support and hollow heat dissipation channel design, it achieves a synergistic improvement in lightweight, high strength and efficient heat dissipation. It is suitable for high heat-generating watch products such as smartwatches and mechanical watches. While reducing weight, it also plays a role in active heat dissipation and visual transparency, preventing the movement from overheating and affecting the timekeeping accuracy. In addition, it can evenly distribute external impacts or pressures throughout the entire support area, avoid stress concentration at a certain point, resist multi-directional loads, reduce resonance caused by external vibrations such as knocking or movement, protect the internal movement, and reduce the probability of movement damage caused by resonance.

[0023] The manufacturing process of this watch includes the following steps: The first step is material preparation: prepare SLM semi-finished parts and ensure the quality requirements of the SLM semi-finished parts through inspection; The second step is powder cleaning: the SLM semi-finished parts that have passed quality control are cleaned with a powder cleaning machine to facilitate the next step of heat treatment. The third step is heat treatment: heat treatment of the SLM semi-finished parts; Step 4, wire cutting: The SLM semi-finished part is fed into the wire cutting equipment for part cutting; Step 5, Remove Supports: Remove the supports from the SLM parts; Step 6, Sandblasting: Sandblast the SLM parts; Step 7, Appearance Inspection: Staff conduct appearance inspection and quality control on SLM parts, and package products that pass quality control. Step 8, Quality Assurance: Inspect the outer packaging of the products to ensure product quality; Step 9, Inspection and Warehousing: Make a final check on the packaged products and put them into the warehouse to await shipment after confirming that everything is correct.

[0024] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A hollowed-out metal watch case structure, comprising a shell and a plurality of connecting protrusions with a raised structure, the connecting protrusions being respectively disposed at both ends of the shell and integrally formed with the shell, characterized in that: The shell has a perforated layer in the middle to assist in heat dissipation. The perforated layer runs through the middle of the shell and is flush with the surface of the shell. The interior of the perforated layer has a support structure arranged in a cross-support configuration.

2. The openwork metal case structure according to claim 1, characterized in that: The support structure includes an upper support truss with both ends abutting against the inner surface of the hollow layer, a middle first support truss, a middle second support truss, and a lower support truss.

3. The openworked metal case structure according to claim 2, characterized in that: The upper support truss, the middle first support truss, the middle second support truss, and the lower support truss are integrally formed with the shell.

4. The hollowed-out metal watch case structure according to claim 3, characterized in that: Both the upper and lower support trusses are arranged in a cross-shaped linear pattern that tapers inward along the perforated layer. The middle first and second support trusses are both inclined structures with opposite inclination angles.

5. The hollowed-out metal watch case structure according to claim 1, characterized in that: The support structure includes a left-angled support column and a right-angled support column, which are arranged in an alternating pattern inside the hollow layer.

6. A hollowed-out metal watch case structure according to any one of claims 1-5, characterized in that: The connecting protrusion has a groove in the middle for installing the watch strap, and the surface of the connecting protrusion has a connecting hole for assisting in the installation of the watch strap fixing shaft, with the connecting hole penetrating the surface of the connecting protrusion.

7. A hollowed-out metal watch case structure according to any one of claims 1-5, characterized in that: The housing has a hollow mounting area in the middle, which is used to mount the watch face.

Images