Electronic Device Case Hanging Lug Arch Bridge Reinforcement
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Solution Overview
Problem
The existing hanging lug structures in electronic device cases are prone to deformation under high loads, compromising the structural strength and stability of the case-circuit board combination.
Innovation Solution
The electronic device case incorporates a multi-lug design with reinforced arch bridge parts and foolproof features, formed through specific cutting and bending processes of sheets to create robust hanging lugs that can withstand high loads, including a first, second, third, and fourth hanging lug configuration, each with distinct supporting and reinforcing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a simple hanging lug structure is used, then the device complexity is reduced, but the load-bearing capacity and structural strength are insufficient
Solution Approach 1:
The hanging lug is divided into multiple functional parts: top board, supporting board, arch bridge part, and reinforcing ribs. Each part performs a specific function - the top board receives screw loads, the supporting board provides structural support, the arch bridge part distributes stress, and the reinforcing ribs prevent deformation. This segmentation allows the structure to handle high loads while maintaining manufacturability through standard cutting and bending operations.
Solution Approach 2:
Reinforcing ribs are strategically positioned at critical stress points on the supporting board and arch bridge part. These localized reinforcements provide additional strength exactly where needed to prevent deformation under load, rather than uniformly thickening the entire structure. This approach increases load-bearing capacity while minimizing added complexity and material usage.
2Strength
If the sheet thickness is increased to prevent deformation, then the structural strength is improved, but the case becomes thicker and more expensive
Solution Approach 1:
Instead of using a single thick sheet, the structure is segmented into multiple thinner components (top board, supporting board, arch bridge part) that work together through geometric interlocking and stress distribution. The arch bridge part specifically distributes loads across multiple points, allowing thinner sheets to achieve the same structural strength as thicker monolithic designs.
Solution Approach 2:
The arch bridge part incorporates curved geometric features that provide inherent structural strength. The arch shape naturally distributes applied loads along its curve, reducing stress concentrations and preventing deformation without requiring increased sheet thickness. This curved geometry achieves high strength-to-thickness ratio.
3Strength
If simple cutting and bending processes are used, then the manufacturing ease is improved, but the hanging lug cannot withstand high loads
Solution Approach 1:
The complex hanging lug structure is broken down into simple sequential manufacturing steps: cutting the sheet into specific shapes, bending at defined angles, and assembling components. Each step uses standard equipment and processes, making the manufacturing easy despite the final structure's complexity. The segmentation allows each component to be manufactured independently and assembled.
Solution Approach 2:
The sheet is pre-cut with specific shapes and pre-bent at required angles before final assembly. The arch bridge part and reinforcing ribs are formed in advance during the same cutting and bending process, rather than requiring additional post-processing steps. This preliminary action simplifies the overall manufacturing workflow while achieving the high-strength structure.
Data Source
AI summary
An electronic device case which includes a bottom shell, a plurality of side shells, a first hanging lug and a second hanging lug is disclosed. The side shells are connected to the bottom shell. The first hanging lug is located on one of the side shells. The first hanging lug includes a first top plate, a first supporting plate, a first hole and a first arch bridge part. The first supporting plate is connected to the first top plate. The first hole is located on the first top plate. The first arch bridge part supports the first top plate. The second hanging lug is located on the bottom shell. The second hanging lug includes a second top plate and a second supporting plate. The second supporting plate is connected to the second top plate.