Rail Emergency Exit Locking System with Electromechanical Bolt
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Solution Overview
Problem
Existing rail vehicle emergency exit door systems are complex for passengers to operate and lack secure mechanisms to prevent incorrect or unintended opening, especially in driverless vehicles where manual intervention is necessary.
Innovation Solution
A locking system comprising an operating unit connected to a Bowden cable that redirects manual force into a pulling movement, with an electromechanical blocking device securing the bolt in place, allowing passenger-operated emergency exit doors that can only be opened under specific conditions like stationarity and fire alarms, and featuring a latch bolt that disengages upon current cessation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex electromagnetic lock system is used to prevent incorrect opening, then security against unauthorized opening is improved, but the device complexity increases and passenger operation becomes more difficult
Solution Approach 1:
The locking system is divided into two independent locking units: a car body-side locking unit with an electromechanical blocking device and a door leaf-side locking unit with a latching bolt. This segmentation allows each unit to perform its specific function independently, simplifying the overall system while maintaining security. The electromechanical blocking device prevents incorrect opening by blocking the bolt's movement, while the latching bolt provides the primary locking function.
Solution Approach 2:
A Bowden cable is introduced as an intermediary mechanism to transmit the unlocking force from the operating unit to the locking units. The Bowden cable allows passengers to operate the door from inside the vehicle without direct access to the locking mechanism, simplifying the user interface while maintaining secure locking. The cable transmits force mechanically, avoiding complex electronic interfaces for the passenger.
2Reliability
If a secure locking mechanism with multiple conditions is implemented, then prevention of incorrect opening is improved, but the ease of operation for passengers deteriorates
Solution Approach 1:
The operating unit is designed to be visually indistinguishable from regular access door unlocking mechanisms, allowing passengers to operate it intuitively without special training. The operating handle and Bowden cable mechanism provide a simple pull action that automatically initiates the unlocking sequence, making the system self-explanatory and easy to use while maintaining security through the electromechanical blocking device.
Solution Approach 2:
Instead of requiring passengers to satisfy multiple conditions to open the door, the system inverts the approach: the door is locked by default, and opening is automatically permitted when the vehicle is stationary and the electromechanical blocking device is deactivated. This inversion simplifies passenger operation while maintaining security through automatic condition checking by the control device.
3Reliability
If an electromechanical blocking device is used to secure the bolt, then reliability against unauthorized opening is improved, but the use of energy increases
Solution Approach 1:
The electromechanical blocking device operates periodically rather than continuously: it is activated when the vehicle is moving to prevent unauthorized opening, and deactivated when the vehicle is stationary to allow emergency exit. This periodic operation significantly reduces energy consumption compared to continuous activation, while maintaining security when needed. The control device automatically manages the activation/deactivation cycle based on vehicle motion status.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy passenger operation of emergency exit doors while preventing incorrect opening, ensuring safety by requiring specific conditions for door release and allowing manual or remote operation, even in driverless vehicles.
Implementation Method 1
The bolt can be fixed in the rest position by means of an electromagnetic blocking device when current flows through this electromagnetic blocking device
Data Source
Figure 1~2B
Figure 3A~3B
AI summary
The invention relates to a locking system (1) for an emergency exit door of a rail vehicle, comprising an operating unit (2), a locking unit on the car-body side (A), and a locking unit on the door-leaf side (B), wherein the operating unit (2) is designed for receiving manually applied force action and for redirecting said force action to a pulling movement (3) of a Bowden cable (4). The locking unit on the car-body side (A) is provided with a slidably mounted bolt (5), which can be deflected from the rest position thereof by means of the pulling movement (3) of the Bowden cable (4), wherein the bolt (5) can be fixed in the rest position thereof by means of an electromagnetic blocking device (6) upon flow of current through said electromagnetic blocking device (6). The locking unit on the door-leaf side (B) is equipped with a latch bolt (7), which in the rest position thereof engages with a lock plate (8) on the car-body side, and which upon deflection of the bolt (5) can be slid from the rest position thereof to an unlatched position.