Rail Power Connector Flap Locking to Prevent Key Bypass
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Solution Overview
Problem
The existing mechanical securing mechanism for external power supply sockets in rail vehicles can be circumvented, allowing improper access and use of multiple sockets, posing safety risks.
Innovation Solution
The flap has a unique slot configuration that prevents the catch from engaging with the housing slot in the second position, ensuring the key cannot be pulled out of the lock cylinder, thereby locking the flap in the open position and securing the key against removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lock cylinder is brought into the closed position with the flap open, then the key can be pulled out, but this allows the mechanical securing mechanism to be circumvented and improper use of multiple sockets becomes possible
Solution Approach 1:
The slot system is segmented into two distinct slots: a first slot in the housing and a second slot in the flap. The catch is designed to engage with both slots simultaneously only when the flap is in the closed position, creating positional dependency that prevents key removal when the flap is open.
Solution Approach 2:
The slot configuration is pre-designed so that the second slot in the flap is positioned to prevent catch engagement with the first slot in the housing when the flap is in the open position. This preliminary geometric arrangement ensures that the securing mechanism cannot be bypassed, as the catch physically cannot engage in the required position when the flap is open.
2Reliability
If the catch completely engages in the slot in the housing in the first state, then the flap is locked in the first position, but the key can be pulled out if the flap is open
Solution Approach 1:
The system dynamically links the key removal function to the flap position through the slot geometry. The second slot in the flap moves relative to the first slot in the housing as the flap rotates, creating a dynamic engagement condition where key removal is only possible when the slots are properly aligned (flap closed).
Solution Approach 2:
The slot configuration acts as an intermediary mechanism between the flap position and the key removal capability. The geometric relationship between the two slots mediates the interaction, allowing key removal only when the flap is in the correct position, thus preventing improper use while maintaining operational ease.
3Adaptability or versatility
If the same key is used for all lock cylinders, then only one socket can be operated at a time, but the lock cylinder can still be brought into closed position with flap open allowing circumvention
Solution Approach 1:
The solution adds a spatial dimension to the key control mechanism by introducing the second slot in the flap. The key can only be removed when the flap is in the closed position, creating a two-dimensional control system (key position + flap position) that maintains security while allowing key universality across multiple sockets.
Data Source
AI summary
An assembly secures a connector of an external power supply in a rail vehicle. The connector is enclosed by a housing and by a rotatably mounted flap. The flap and the housing each have a slot configured to receive a catch. The flap can have two positions: a first position, in which the flap covers the connector and thus prevents access to the connector, and a second position, in which access to the connector is possible. The flap supports a lock cylinder, which can be switched by a key into two states: in a first state, the key can be pulled out of the lock cylinder, and in a second state, the key is secured in the lock cylinder against removal. A catch is rotated into both slots or out of both slots by the lock cylinder.