A device casing

Abstract

Present invention generally relates to a device casing (10). The device casing (10) comprising a first cover (100) and a second cover (200). The first cover (100) having a housing (102) and a coupling flange (104) extending outwardly and away from the housing (102). The second cover (200) configured to be coupled to the first cover (100), the second cover (200) having a continuous protrusion (210) formed on an inner surface (202) and running adjacent to peripheral sides of the second cover (200), the continuous protrusion (210) comprises a groove (214) configured to securely retain a gasket (G) for hermetically sealing the second cover (200) with the first cover (100), whereby each of the continuous protrusion (210) and the coupling flange (104) has a non-flat contacting surface(S1, S2).

Description

[0001] TITLE OF INVENTION A DEVICE CASING

[0002] FIELD OF THE INVENTION

[0003]

[0001] The present invention relates to a device casing.

[0004] BACKGROUND OF THE INVENTION

[0005]

[0002] The casing or enclosure of electronic devices is essential for protecting internal components of the devices from external environmental factors, maintaining structural integrity, and ensuring stable performance in various operating conditions. Enclosures used in power distribution units, vehicle control systems, motor controllers, and other devices shield components or internal electrical devices from hazards such as dust, moisture, vibrations, and temperature fluctuations. The internal electrical devices may include diodes, bus bars, fuses, transistors, sensors, printed circuit boards, etc. In the event of water ingress, sparking between these internal electrical devices is possible owing to close proximity of disposition and water being a good electrical conductor. In high power applications, the rating of the fuses and the internal electrical devices are higher, and the propensity or damages associated with sparking between high rated electrical devices leads to dire consequences.

[0006]

[0003] To improve sealing effectiveness, these enclosures often feature a gasket between two joined surfaces, creating a tight seal that minimizes the chance of contaminants entering and affecting the device. However, existing device enclosures present several challenges that reduces enclosure efficiency and reliability. One notable issue with current enclosure is the cost linked to the gasket replacement. When a device enclosure is opened for servicing or repair, the gasket may detach or become damaged. In other words, re-fitting of the gasket into the earlier designated place is unmanageable owing to altered elasticity and changes in material strength characteristics of the gasket based on prior use. More specifically, upon re-opening of the enclosure, the gasket springs out of the designated place, and re-conformance to the earlier slot is difficult since the gasket is now in an elongated state. The usage of specialized manufacturing in fitting the gasket to the respective slot by compression of the gasket is no longer applicable. Although gaskets are made for a snug fit, they often lose their sealing capability once removed, making them difficult to reinstall. As a result, technicians frequently require replacing the gasket entirely to restore the seal, which not only increases the cost of parts but also adds labour and material expenses with each service. In applications requiring frequent maintenance, these cumulative replacement costs can significantly impact the device's overall cost-effectiveness and sustainability.

[0007]

[0004] Further, it has also been observed that gaskets play a key role in protecting internal components from contaminants like water and dust, yet manufacturing deviations in moulding or fabrication creates minor gaps on the enclosure's mating surfaces, compromising the seal and increasing the risk of ingress of fluids. Since gaskets are detachable, they require precise fitting and placement. Any slight deviation in either the gasket's positioning or the enclosure's moulding can significantly affect the seal quality. Consequently, devices may be vulnerable to water or dust ingress, which can degrade performance or even lead to component failure. Inconsistent sealing not only jeopardizes the device’s reliability but also threatens its compliance with standard ingress protection (IP) ratings, which are especially important for devices used in challenging environments.

[0008]

[0005] Another challenge stems from existing configuration of the enclosures which require fasteners, like screws or bolts, to secure the two halves / parts of the enclosure. These fasteners are crucial for structural integrity, yet they present additional sealing obstacles. To accommodate fasteners and ease assembly, slight variations, or tolerances, in hole size and alignment are required. Nonetheless, these tolerances create pathways for water ingress, particularly in environments where high ingress protection is needed, such as automotive or industrial applications. Water ingress through these fastener holes can compromise the enclosure’s protection. It has also been observed that ensuring a reliable seal around each fastener hole adds complexity to both design and manufacturing, as it demands additional sealing solutions or stricter tolerances, which in turn can further elevate costs and the risk of sealing failure.

[0009]

[0006] Thus, there is a need for a device casing, that addresses at least the aforementioned problems.

[0010] SUMMARY OF THE INVENTION

[0011]

[0007] In accordance with the present invention, a device casing is disclosed. The device casing includes a first cover and a second cover. The first cover includes a housing and a coupling flange extending outwardly and away from the housing. The second cover coupled to the first cover. The second cover has a continuous protrusion formed on an inner surface and running adjacent to peripheral sides of the second cover. The continuous protrusion includes a groove configured to securely retain a gasket for hermetically sealing the second cover with the first cover. Each of the continuous protrusion and the coupling flange has a non-flat contacting surface.

[0012]

[0008] In an embodiment, a pre-defined length of the continuous protrusion extends inclinedly to a surface of the coupling flange of the second cover.

[0013]

[0009] In an embodiment, at least a portion of the housing of the first cover being integrally mounded with a portion of the one or more fastening means. The integrally moulded portion of the housing and the fastening means collectively form a rectangular profile.

[0014]

[0010] In an embodiment, the continuous protrusion extends in a direction away from the inner surface and in a direction towards the housing of the first cover.

[0015] [Oi l] In an embodiment, the coupling flange comprises an outer edge and an inner edge, the inner edge being interfacing with the housing.

[0016]

[0012] In an embodiment, the inner edge of the coupling flange comprises a stepped portion, the stepped portion being configured to accommodate the continuous protrusion of the first cover.

[0017]

[0013] In an embodiment, the second cover comprises a plurality of mounting holes for receiving fasteners, wherein the plurality of mounting holes being disposed between the continuous protrusion and the peripheral sides of the second cover.

[0014] In an embodiment, the plurality of mounting holes being positioned spaced apart with a predetermined distance.

[0018]

[0015] In an embodiment, the coupling flange of the first cover having a plurality of slots being distant from the inner edge, each of the plurality of slots being configured to receive the fasteners for attaching the second cover with the first cover.

[0019]

[0016] In an embodiment, the continuous protrusion has two opposite pairs of protruded portions, each of the pair of protruded portions has an outer peripheral edge and an inner peripheral edge.

[0020]

[0017] In an embodiment, the inner peripheral edge extends non-linearly between a first end and a second end in a horizontal plane of the second cover.

[0021] BRIEF DESCRIPTION OF THE DRAWINGS

[0022]

[0018] Reference will be made to embodiments of the invention, examples of which may be illustrated in accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.

[0023] Figure 1A is a perspective view of a device casing, in accordance with an embodiment of the present invention.

[0024] Figure IB is an exploded view of the device casing shown in Figure 1A, in accordance with an embodiment of the present invention.

[0025] Figure 2A is a bottom perspective view of a second cover of the device casing, in accordance with an embodiment of the present invention.

[0026] Figure 2B is an exploded view of the second cover shown in Figure 2A, in accordance with an embodiment of the present invention.

[0027] Figure 3 is a bottom view of the second cover of the device casing, in accordance with an embodiment of the present invention.

[0028] Figure 4 is a top perspective view of the first cover of the device casing, in accordance with an embodiment of the present invention. Figure 5 is a perspective cross-sectional view of the first cover of the device casing, in accordance with an embodiment of the present invention.

[0029] Figure 6 is an exploded view of the first cover of the device casing, in accordance with an embodiment of the present invention.

[0030] Figure 7 is a top view of the first cover of the device casing, in accordance with an embodiment of the present invention.

[0031] DETAILED DESCRIPTION OF THE INVENTION

[0032]

[0019] The present invention discloses a device casing. The device casing is an outer protective shell that houses and safeguards components which serves multiple essential functions. The device casing includes a first cover and a second cover for effectively sealing and protecting internal components from physical damage, dust, and moisture while also contributing to thermal management. The casing provides structural integrity, ensuring that components are securely held in place. The device casing mitigates electrical connection failures by providing secure and stable housing for connections. Further, the device casing reduces the risk of disconnections or loose contacts by integrating the fasteners with the second cover and tightening the bolts with a suitable torque. Additionally, the device casing adequately insulates the components by maintaining a gap between the fasteners and various components of the second cover. Furthermore, the device casing minimizes power loss and voltage drop by providing a robust structure that maintains the integrity of electrical pathways and IP- related failures are mitigated by ensuring protection even after multiple cycles of assembly and disassembly by placing the gasket in the groove and making it difficult to access. Further, the device casing ensures protection against dust and moisture ingress by providing a continuous protrusion in the first cover and non-flat abutting surfaces between the first cover and the second cover thereby making the device suitable for a wide range of environments, and improving the durability of the component, resulting in a longer lifespan and better performance. Further, providing recess at the second cover addresses hole tolerance issues with fasteners.

[0020] Figure 1A shows a perspective view of a device casing 10, in accordance with an embodiment of the present invention. Figure IB illustrates an exploded view of the device casing 10 shown in Figure 1A, in accordance with an embodiment of the present invention. The device casing 10 includes a first cover 100 and a second cover 200. The first cover 100 has a housing 102 to house one or more components. In a non-limiting example, the device casing 10 is a casing of a power distribution unit or a vehicle controller. The one or more components include, but not limited to a circuit board, power modules, sensors, connectors, ports, wiring and harness, circuit breakers, relays, rectifiers, transformers and the like. The second cover 200 is configured to be coupled to the first cover 100 through one or more fasteners 220. In a non-limiting example, the first cover 100 is a bottom cover and the second cover 200 is a top cover.

[0033]

[0021] Referring to Figure IB, the second cover 200 includes an inner surface 202 and an outer surface 201. A gasket (G) is secured to the second cover 200 on the inner surface 202 of the second cover 200. The housing 102 is configured to receive the one or more components. The first cover 100 includes a coupling flange 104 which extends outwardly and away from the housing 102. In a non-limiting example, the housing 102 of the first cover 100 is configured to receive one or more fuses 160 and a bus bar 150. The bus bar 150 is coupled to the housing 102 via, one or more fastening means (M) which are integrally coupled to the housing 102. The fuses 160 are disposed in the housing 102 via the one or more fastening means (M). The bus bar 160 is connected to the fuses 160 and to the one or more fasteners (M) using one or more bolts (N).

[0034]

[0022] Figure 2A shows a bottom perspective view of the second cover 200. As shown, the second cover 200 includes a continuous protrusion 210. The continuous protrusion 210 is formed on the inner surface 202 of the second cover 200. The continuous protrusion 210 runs adjacent to peripheral sides of the second cover 200.

[0035]

[0023] In an embodiment, the continuous protrusion 210 includes a groove 214. The groove 214 is configured to securely retain the gasket (G) for hermetically sealing the second cover 200 with the first cover 100, thereby restricting the ingress of water and dust inside the housing 102 of the first cover 100.

[0024] In an embodiment, the continuous protrusion 210 of the second cover 200 and the coupling flange 104 of the first cover 100 has a non-flat contacting surface (SI, S2) in order to restrict the ingress of water and dust. In other words, the abutting surface between the first cover 100 and the second cover 200 has a non-flat or an irregular surface to prevent the water and dust entry. The continuous protrusion 210 protrudes away from the inner surface 202 and in a direction towards the housing 102 of the first cover 100. In a non-limiting example, the protruding direction being a vertical direction denoted by numeral (V) in figure IB. In a non-limiting example, the protrusion 210 may be intermittent with varying width of the gasket (G).

[0036]

[0025] In another embodiment, a portion of the continuous protrusion 210 extends inclinedly to a surface of the coupling flange 104 of the first cover 100 for a pre-defined length. The inclined portion of the continuous protrusion 210 creates a more effective seal or tightened fit when the second cover 200 is fastened to the first cover 100 with a draft angle. This draft angle is provided during manufacturing / casting the second cover 210 which is a critical consideration to distribute pressure evenly across the coupling flange surface, which enhances structural stability and minimizes the risk of misalignment. Furthermore, by inclining toward the flange surface, this portion of the continuous protrusion 210 acts as a guiding feature, assisting in the precise positioning of the second cover 200 during assembly. The result is a more streamlined assembly process, reducing the likelihood of assembly errors and ensuring that the device casing 10 maintains a tight, flush fit once installed. Additionally, this strategically inclined configuration helps in mitigating the effects of external stresses, such as vibrations or impacts subjected to the device casing 10 in its operating condition. The pre-defined length of this inclined portion is calculated / decided basis the exact amount of contact area required for structural integrity without compromising the flexibility required for any slight adjustments during assembly of the device casing 10. In a non-limiting example, the continuous protrusion 210 is positioned perpendicular to the surface of the coupling flange 104 of the first cover 10 when the second cover 200 is assembled with the first cover 100.

[0026] In an embodiment, the continuous protrusion 210 includes two opposite pairs of protruded portions i.e. 210a, 210b, 210c, and 210d. Each of the pair of protruded portions 210a, 210b, 210c, 210d comprises an outer peripheral edge 211 and an inner peripheral edge 212. The inner peripheral edge 212 of these protruded portions has a non-continuous profile which ensures that water ingress into the housing 102 of the first cover 100 is blocked when the second cover 200 is assembled with the first cover 100. The inner peripheral edge 212 extends non-linear ly between a first end (A) and a second end (B) in a horizontal plane of the second cover 200, such a non-linear profile ensures that the compression stress in the gasket (G) is activated by tightening of the fastener to be uniform without any deviations or bulking in areas.

[0037]

[0027] In a non-limiting example as shown in figure 2B, the plurality of mounting holes 204 is disposed between the continuous protrusion 210 and the peripheral sides 210, 211 of the second cover 200. The plurality of mounting holes 204 is positioned in such a way that it is spaced apart with a predetermined distance (P). In an embodiment, the predetermined distance (P) is determined ensuring that there is no laxity in the gasket (G) which may deteriorate its compression stress.

[0038]

[0028] Figure 2B illustrates an exploded view of the second cover 200. The groove 214 is provided so that the gasket (G) is securely retained to the second cover 200. In an aspect, the groove 214 and the continuous protrusion 210 are adjacent to each other. In an embodiment, the groove 214 and the continuous protrusion 210 share a same interfacing surface. The second cover 200 has plurality of mounting holes 204 formed between the groove (G) and the outer peripheral edge 211. The mounting holes 204 are provided to receive one or more fasteners 220. The one or more fasteners 220 are fastened through one or more screws 230 which are housed on the first cover 100 thereby tightly sealing the first cover 100 and the second cover 200. In a non-limiting example, the ingress of water into the housing 102 of the first cover 100 is restricted by hermetically sealing the first cover 100 with the second cover 200. The second cover 200 comprises the continuous protrusion 210, the continuous protrusion protrudes away from the inner surface 202 of the second cover 200 and in a direction towards the housing 102 of the first cover 100, thereby restricting the water ingress. Further, the second cover 200 is provided with a groove 214 which houses the gasket (G) so that the gasket (G) cannot be removed and the compression stress in the gasket (G) which is activated by the fasteners 220 is uniform and the stops the ingress of water. Further, one or more slots 112 are provided in the first cover 100, the one or more slots 112 restricts the ingress of water into the housing 102 of the first cover 100.

[0039]

[0029] As shown in figure 3, the second cover 200 includes a plurality of mounting holes 204. The mounting holes 204 are provided for receiving one or more fasteners 220. In a non-limiting example, the plurality of mounting holes 204 is disposed between the continuous protrusion 210 and the peripheral sides 210, 211 of the second cover 200. The plurality of mounting holes 204 is positioned in such a way that it is spaced apart with a predetermined distance (P). In an embodiment, the predetermined distance (P) is determined ensuring that there is no laxity in the gasket (G) which may deteriorate its compression stress. In other words, the predetermined distance is configured to ensure there is no gap created between adjacent fastening units during application of the tightening torque at the respective fastening units, yet not close enough to create redundant compressive stresses in the second cover. In a non-limiting example, the distance between the gasket (G) and a periphery of the one or more fasteners 220 is 3mm to 4mm to always ensure that a high compression state of the gasket(G) is maintained.

[0040]

[0030] In a non-limiting example, as illustrated in Figure 3, each of ends (A, B) (shown in Figure 2 A) of the second cover 200, joining each of the opposite pairs of protruded portions 210a, 210b, 210c, and 210d, is having an irregular profile 240. This irregular profile 240 is defined by a plurality of interconnected regions, labelled as 240a, 240b, 240c, 240d, and 240e, which collectively form a geometrical pattern on the inner edge of the protruded portions. In a non-limiting example, these regions being connected through a series of integrally formed straight and / or inclined / curved / bent portions, creating a polygonal or angular like structure which contributes to the irregular over all profile of the inner edge of the mating ends (A, B). In yet another non-limiting example, the regions are formed through a combination of straight, inclined, and curved portions, contributing to an uneven yet deliberately designed profile along the inner edge of the respective protruded portions. Such profile / configuration ensure uniform distribution of compression stress within the gasket (G) when activated by the tightening of fasteners 220. By mitigating deviations or localized bulging, the irregular profile further enhances the structural integrity and sealing performance of the gasket, reducing the risk of stress concentrations that could compromise its functionality. This configuration of the second cover 200 provides improved reliability, especially in applications where precise stress distribution is critical for maintaining an effective seal under varying operational conditions.

[0041]

[0031] Figure 4 shows a top perspective view of the first cover 100. The housing 102 of the first cover 100 is configured to receive one or more electrical components. The first cover 100 has a coupling flange 104 extending outwardly and away from the housing 102. The coupling flange 104 has an outer edge 106 and an inner edge 108. The inner edge 108 is integrally connected to the housing 102. Further, the inner edge 108 of the coupling flange 104 comprises a stepped portion 110. The stepped portion 110 is configured to accommodate the continuous protrusion 210 of the second cover 200, thereby tightly sealing the device casing 10 to arrest the ingress of water and dust. Furthermore, the coupling flange 104 of the first cover 100 comprises a plurality of slots 112. The plurality of slots 112 is at a distant from the inner edge 108 and each of the plurality of slots 112 is configured to receive the fasteners 220 and fastening it with one or more screws 230 present in the slots 112, thereby addressing hole tolerance issues of the fasteners and attaching the second cover 200 with the first cover 100. Further, the plurality of slots 112 helps to prevent the ingress of water into the housing 102 of the bottom cover 100.

[0042]

[0032] In an aspect, the disposition of the plurality of slots 112 of the first cover 100 is in-line with the disposition or provision of the plurality of mounting holes 204 of the second cover 200.

[0033] Figure 5 shows a cross-sectional view of the first cover 100. A portion of the one or more fastening means (M) is integrally moulded in a portion of the housing 102 of the first cover 100. In an embodiment, the one or more fastening means (M) has a head portion and a shank portion. In a non-limiting example, a portion of the head portion of the one or more fastening means (M) is integrally moulded with the portion of the first cover 100 thereby forming a rectangular / square profile 114. The square profile 114 in the first cover 100 ensures anti-rotation of the one or more fastening means (M), thereby removing / replacing the electronic components by loosening the one or more bolts (N) is not permissible. In other words, the tightening torque required for mounting or disposition of the electrical components in the housing 102 via the one or more fastening means (M) remains unaffected even after prolonged use over the stipulated maintenance and servicing time.

[0043]

[0034] During the assembly process, the shank of the one or more fastening means (M) remains exposed for mounting or connection with the electronic components which can be fastened onto the exposed shank. The enmoulding or integrally moulding a portion of the fastening means (M) with the housing 102 also reduces the number of tools involved in holding one end of the fastening means (M) in position while the other end be tightened and loosened for access to the one or more electronic components, the fastening means (M) may be securing.

[0044]

[0035] Figure 6 and figure 7 illustrate perspective and top views of the first cover 100 respectively. In a non-limiting example, the device casing 10 is for a power distribution unit of which components are disposed inside the housing 102.The power distribution unit distributes electrical power from a centre source to multiple devices, various sub system components such as battery, MCU, faster charger, ON / OFF board charger and DC to DC converter and the like. The first cover 100 has one or more fastening means (M) being integrally moulded on the inner surface 102. The one or more fastening means (M) acts as the mating provisions for the busbar 150, one or more fuse 160, wire terminals, cable glands and the like. The busbar 150 is mounted on the one or more fastening means (M) in the first cover 100.

[0036] In a non-limiting example, the one or more fastening means (M) includes a M8 bolt and a M6 bolt. A gap / clearance of 0.4mm must be maintained between the M8 and M6 bolt surfaces and a side surface of the housing 102 of the first cover 100 to prevent electric arc or arcing. Further, the one or more fuses 160 includes a 150A fuse, 400A fuse and an 80A fuse. The 80A fuse should be placed in a MCU direction and the 150A fuse must be placed in a fast charge direction and the 400A fuse in a ON / OFF board direction thereby optimizing the space and making the casing compact thereby addressing the issues of space constraints. Further, the M8 bolt is fastened to its screw 230 by applying a torque of 18Nm and the M6 bolt is fastened to its screw 230 by applying a torque of 9Nm on the busbar 150 to ensure the respective M8 and M6 bolt are in positions and does not loosen up due to vibrations of the device casing. In another non-limiting example, the first cover 100 and second cover 200 are fastened by the fasteners with a torque of 4Nm to avoid loosening of the fastening mechanisms. In another non-limiting example, the first cover 100 has a plurality of slots 112 which are provided in the first cover 100. The plurality of slots 112 is at a distant from the inner edge 108 and each of the plurality of slots 112 is configured to receive the fasteners 220 and fastening it with one or more screws 230 present in the slots 112, thereby addressing hole tolerance issues of the fasteners and attaching the second cover 200 with the first cover 100. The fasteners 220 and the screws 230 are fastened with a torque of 4Nm to avoid loosening of the fastening mechanism due to vibrations.

[0045]

[0037] In a non-limiting example, the first cover 100 and the second cover 200 (shown in Figures 1 A, IB) of the device casing 10 are made of a high-density material such as Nylon 6 and GF 30 of grade V0.

[0046]

[0038] In a non-limiting example, the device casing can be a casing for a power distribution unit, a casing for an electrical circuit unit, a casing for a battery unit and the like.

[0047]

[0039] Advantageously, the present invention offers significant enhancement in terms of both functionality and efficiency, by optimizing space utilization. The configuration of the device casing of present invention can potentially reduce overall weight of the device when assembled with the device casing, thereby enhancing performance and efficiency. Additionally, the configuration of the continuous protrusion with the groove making it difficult to frequent detachment / removal unlike conventional device casing and thus leading to substantial cost reductions and easing the assembling / servicing of the device casing.

[0048]

[0040] Further, the casing of the present invention offers several advantages such as mitigating electrical connection failures by providing secure and stable housing for connections, reducing the risk of disconnections or loose contacts by integrating the fasteners with the second cover and tightening the bolts with a suitable torque. Additionally overheating and thermal runaway has been avoided and short circuits and electrical arching is avoided by adequately insulating the components by maintaining a gap between the fasteners and various components of the second cover. Furthermore, it minimizes power loss and voltage drop by providing a robust structure that maintains the integrity of electrical pathways. The IP-related failures are mitigated by ensuring protection even after multiple cycles of assembly and disassembly by placing the gasket in the grove and making it difficult to access and by ensuring protection against dust and moisture ingress by providing a continuous protrusion in the first cover and nonflat abutting surfaces between the first cover and the second cover thereby making the device suitable for a wide range of environments, and improving the durability of the component, resulting in a longer lifespan and better performance. Further providing recess at the second cover addresses hole tolerance issues with fasteners.

[0049]

[0041] The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since the modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to the person skilled in the art, the invention should be construed to include everything within the scope of the disclosure.

Claims

WE CLAIM:

1. A device casing (10) comprising: a first cover (100) having a housing (102) and a coupling flange (104) extending outwardly and away from the housing (102); and a second cover (200) configured to be coupled to the first cover (100), the second cover (200) having a continuous protrusion (210) formed on an inner surface (202) and running adjacent to peripheral sides of the second cover (200), the continuous protrusion (210) comprises a groove (214) configured to securely retain a gasket (G) for hermetically sealing the second cover (200) with the first cover (100), whereby each of the continuous protrusion (210) and the coupling flange (104) has a non-flat contacting surface (SI, S2).

2. The device casing (10) as claimed in claim 1, wherein a pre-defined length of the continuous protrusion (210) extends inclinedly to a surface of the coupling flange (104) of the second cover (200).

3. The device casing (10) as claimed in claim 1, wherein at least a portion of the housing (102) of the first cover (100) being integrally moulded with a portion of the one or more fastening means (M).

4. The device casing (10) as claimed in claim 1, wherein the continuous protrusion (210) extends in a direction away from the inner surface (202) and in a direction towards the housing (102) of the first cover (100).

5. The device casing (10) as claimed in claim 1, wherein the coupling flange (104) comprises an outer edge (106) and an inner edge (108), the inner edge (108) being interfacing with the housing (102).

6. The device casing (10) as claimed in claim 5, wherein the inner edge (108) of the coupling flange (104) comprises a stepped portion (110), the stepped portion (110) being configured to accommodate the continuous protrusion (210) of the first cover (100).

7. The device casing (10) as claimed in claim 1, wherein the second cover (200) comprises a plurality of mounting holes (204) for receiving fasteners (220), wherein the plurality of mounting holes (204) being disposed between the continuous protrusion (210) and the peripheral sides of the second cover (200).

8. The device casing (10) as claimed in claim 7, wherein the plurality of mounting holes (204) being positioned spaced apart with a predetermined distance (P).

9. The device casing (10) as claimed in claim 1, wherein the coupling flange (104) of the first cover (100) comprises a plurality of slots (112) being distant from the inner edge (108), each of the plurality of slots (112) being configured to receive the fasteners (220) for attaching the second cover (200) with the first cover (100).

10. The device casing (10) as claimed in claim 1, wherein the continuous protrusion (210) comprises two opposite pairs of protruded portions (210a, 210b, 210c, 210d), each of the pair of protruded portions (210a, 210b, 210c, 210d) comprises an outer peripheral edge (211) and an inner peripheral edge (212).

11. The device casing (10) as claimed in claim 10, wherein the inner peripheral edge (212) extends non-linearly between a first end (A) and a second end (B) in a horizontal plane of the second cover (200).

2. The device casing (10) as claimed in claim 3, wherein the integrally moulded portion of the housing (102) and the fastening means (M) collectively form a rectangular profile.

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