Railway Vehicle Cover Interlock for Closed-Position Locking
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Solution Overview
Problem
The high-voltage device box for electric railway vehicles requires a complex mechanism for locking the inspection cover, involving a swinging claw and lock pin, which complicates the interlock system.
Innovation Solution
A simplified interlock mechanism using a lock, restricting member, pushing member, and urging member, where the pushing member moves the restricting member to a lock permitting position upon cover closure, allowing locking while preventing unlocking until the cover is fully closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex interlock mechanism with swinging claw and lock pin is used to ensure safety, then the reliability of cover locking is improved, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex swinging claw and lock pin mechanisms from the interlock system. Instead, it uses a simple lock mechanism that integrates directly with the cover and housing, removing unnecessary components while maintaining the safety function of preventing cover opening during operation.
Solution Approach 2:
The lock mechanism serves multiple functions: it locks the cover in the closed position, prevents opening during operation, and integrates with the housing structure. This multi-functional design eliminates the need for separate swinging claw and lock pin mechanisms, reducing overall device complexity while maintaining reliability.
2Reliability
If a complex interlock mechanism with multiple components is used, then the safety and reliability of locking are improved, but the ease of manufacture deteriorates
Solution Approach 1:
By removing the swinging claw and lock pin components, the patent significantly reduces the number of parts that need to be manufactured and assembled. The simplified lock mechanism can be produced with fewer machining operations and less precise tolerances, improving ease of manufacture while maintaining locking safety.
Solution Approach 2:
The lock mechanism is integrated with the cover and housing structures, combining multiple functions into unified components. This merging reduces the total number of discrete parts and simplifies the manufacturing process, as fewer components need to be produced and assembled separately.
3Device complexity
If a simplified interlock mechanism is used, then the device complexity is reduced, but the reliability of preventing unauthorized opening may deteriorate
Solution Approach 1:
The lock mechanism acts as an intermediary between the cover and housing, providing a reliable locking interface through a key-operated system. This mediator ensures that the cover can only be opened when the lock is unlocked with the proper key, maintaining reliability despite the simplified overall structure.
Solution Approach 2:
The patent concentrates the locking reliability function into a specific local area - the lock mechanism itself - rather than distributing complexity throughout the entire interlock system. The lock provides focused, reliable locking action at the critical point where the cover meets the housing, while the rest of the system remains simple.
Data Source
AI summary
A control device for a railway vehicle includes a housing and a cover covering an opening. The cover is provided with a lock and a restricting member. The restricting member is located in one of a lock permitting position for permitting locking of the cover and a lock restricting position for restricting locking of the cover. The control device further includes an urging member that urges the restricting member to the lock restricting position. When the cover closes the opening, a pushing member pushes the restricting member to the lock permitting position, resulting in permission of locking of the cover.