Fusible Link Unit Locking Member Torsional Separation
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Solution Overview
Problem
Conventional fusible link units with foldable structures are prone to separation when a torsional force is applied, as the temporary locking mechanism relies solely on resin parts, which can detach under torsional stress.
Innovation Solution
The introduction of a locking member with abutting portions and recesses on both bodies, along with a rectangular open-top-box structure for the locking member, enhances the rigidity and prevents separation by maintaining the locked state even under torsional forces, ensuring the first body does not easily come off from the second body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only temporary locking parts made of resin are used to hold the foldable structure, then the device complexity is reduced, but the reliability deteriorates when torsional force is applied
Solution Approach 1:
The locking mechanism is divided into multiple independent components: temporary locking parts made of resin for basic holding, and a separate locking member with locked portions that engage with locking parts on both the first and second bodies. This segmentation allows each component to perform its specific function - the resin parts provide simple temporary holding while the locking member provides robust anti-torsional locking, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The locking mechanism combines different materials with complementary properties: resin material for the temporary locking parts that provides ease of molding and basic holding function, and a more rigid material for the locking member that provides strength against torsional forces. This composite approach allows the system to achieve both low complexity and high reliability by using each material where it is most effective.
2Area of stationary object
If the bus bar is bent to form a foldable structure, then the heat radiation portion expansion is prevented, but the stability deteriorates when torsional force is applied
Solution Approach 1:
The locking member is installed in advance on the foldable structure to prevent torsional separation before it can occur. The locked portions of the locking member engage with the locking parts on the first and second bodies, creating preliminary anti-action against torsional forces that would otherwise cause the bent bus bar structure to separate, thus maintaining both the compact heat radiation area and structural stability.
3Stability of the object's composition
If a locking member with multiple abutting portions is added, then the stability under torsional force is improved, but the device complexity increases
Solution Approach 1:
Multiple locking functions are merged into a single integrated locking member. The locking member combines multiple locked portions that simultaneously engage with locking parts on both the first and second bodies, and includes multiple abutting portions for preventing both separation and approach of the folded bodies. This merging provides comprehensive stability against various forces while adding only one component rather than multiple separate mechanisms, thus improving stability with minimal increase in complexity.
Data Source
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AI summary
A fusible link unit (1) includes a locking member (3) having a first locked portion (11), a second locked portion (13), and a pair of first abutted portions (15); a connection section (5); a first body (7) having a first locking part (19) and a pair of first abutting parts (21), the first body (7) being extended from the first boundary (27) in a predetermined direction, and the first boundary (27) being a boundary extending in a direction that intersects a deployed direction of the first abutting parts (21); and a second body (9) having a second locking part (29) and a pair of second abutting parts (31), and extending in the same direction as the first body (7) from the second boundary (37), the second boundary (37) being a boundary extending in a direction that intersects a deployed direction of the second abutting part (31).