Railway Points Mating Profile Alignment
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Solution Overview
Problem
Traditional railway points and track crossings face issues such as derailment risks during transition states, premature wear, and reliability concerns due to misalignment and thermal expansion, while existing swing nose and swing wing crossings are costly and complex, limiting their adoption.
Innovation Solution
A railway points arrangement featuring longitudinally-extending static stock rails and movable switch rails with a mating profile that aligns and locks in position, allowing vertical and transverse movement to select routes, and a railway track crossing with independently movable wing rails that adopt a closed position passively under load, ensuring continuous support and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional railway points with movable switch rails are used, then route selection capability is provided, but derailment risk occurs during transition state
Solution Approach 1:
Instead of moving switch rails between stock rails to change routes, the invention inverts the approach by having fixed stock rails and movable rails that move laterally between positions. The movable rails are held in place by gravity when not actuated, eliminating the transition state derailment risk while still enabling route selection.
Solution Approach 2:
The movable rails utilize gravity as a self-service mechanism to automatically return to their default position (aligned with the straight route) when not actuated. This eliminates the need for active locking mechanisms during transition and ensures the rails are always in a safe, defined position.
2Reliability
If stub switch design is used, then blockage likelihood is reduced, but alignment difficulty causes premature wear
Solution Approach 1:
The invention moves the alignment problem from a horizontal plane issue to a vertical plane solution by using gravity to maintain the lateral position of movable rails. The rails are positioned in grooves or on supports that constrain horizontal movement, while gravity provides the restoring force, eliminating alignment difficulty.
Solution Approach 2:
The invention introduces intermediate supports or grooves between the movable rails and the stock rails that act as mediators to maintain proper alignment. These supports ensure the movable rails remain correctly positioned laterally while allowing vertical movement for route selection.
3Ease of manufacture
If stub switch design is used, then modular construction is simplified, but thermal expansion causes jamming
Solution Approach 1:
The invention changes the operational parameter of the movable rails from horizontal movement (prone to thermal expansion jamming) to vertical/lateral movement on fixed supports. The movable rails move laterally between positions while remaining vertically supported, allowing thermal expansion without causing jamming of the switching mechanism.
4Reliability
If swing nose or swing wing crossings are used, then wear and noise are reduced, but device complexity and cost increase
Solution Approach 1:
The movable rails in the crossing use gravity as a self-service mechanism to automatically return to the closed position (contacting the crossing nose) when not actuated. This eliminates the need for complex active locking mechanisms or continuous power supply, reducing device complexity while maintaining the wear and noise reduction benefits.
Data Source
AI summary
A railway points arrangement 10 for a railway track junction comprises at least first and second pairs of longitudinally-extending, parallel-spaced static stock rails 12, 14, defining respectively a first route and a second route, and a pair of longitudinally-extending, parallel-spaced switch rails 16 which are movable between a first position in alignment with the first pair of stock rails 12 to select the first route and a second position in alignment with the second pair of stock rails 14 to select the second route. At least one of the movable switch rails 16a cooperates with at least one stock rail 12, 14 of each of the first and second pairs of stock rails 12, 14 when the movable switch rails 16 are in the first and second positions, and the at least one switch rail 16 and the at least one stock rail 12, 14 are shaped to define a mating profile 50 which aligns the switch rail 16 and stock rail 12, 14 and prevents transverse movement of the switch rail 16 relative to the stock rail 12, 14.