Rail Switch Wedge Locking via H-Shaped Coupling Element
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Solution Overview
Problem
Existing solutions for securing the tongue block in railroad switches, such as wedges and spacer plates, tend to loosen over time due to inadequate fixation, leading to instability and difficulty in assembly and maintenance.
Innovation Solution
A coupling element, specifically an H-shaped profile with a flange and elongated hole, is used to securely connect the wedge to the latch block, preventing rotation and withdrawal, and is adjustable to ensure a form-fitting engagement with the wedge, allowing for easy assembly and secure locking between the latch block and the tongue rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a wedge is used to secure the tongue block against twisting, then the tongue block is stabilized, but the wedge loosens over time due to inadequate fixation
Solution Approach 1:
A coupling element is introduced as an intermediary component between the wedge and the latch block. This coupling element has a form-fitting connection with the wedge and is fixed to the latch block, serving as a mediator that securely transmits forces and prevents the wedge from loosening while maintaining the stabilizing function on the tongue block.
Solution Approach 2:
The fixation system is segmented into distinct functional components: the wedge for anti-twisting, the coupling element for secure connection, and the latch block for mounting. This segmentation allows each component to be optimized for its specific function while working together as a reliable assembly, with the coupling element specifically designed to prevent wedge migration.
2Reliability
If locking plates are used to secure the wedge, then the wedge is fixed, but the locking plates themselves loosen and fail to maintain positive connection
Solution Approach 1:
The coupling element serves as a superior intermediary compared to locking plates. It features a form-fitting connection with the wedge through engagement with protrusions or grooves, and is securely fixed to the latch block, creating a reliable transmission path that eliminates the loosening problems experienced with plate-based locking systems.
Solution Approach 2:
The coupling element employs form-fitting geometric connections (such as complementary protrusions and grooves) that create inherent mechanical interlocking. This geometric constraint system provides stable positioning and prevents migration without relying on friction or additional fastening elements that could loosen over time.
3Stability of the object's composition
If spacer plates of different thicknesses are used instead of wedge, then the tongue block is secured, but a precise sequence must be observed when driving in the sheets
Solution Approach 1:
The assembly process is simplified by segmenting the function into two clear steps: first inserting the wedge to provide immediate mechanical stabilization, then adding the coupling element to secure the wedge. This segmentation eliminates the complex sequencing requirements of driving multiple spacer plates of different thicknesses in a specific order.
Solution Approach 2:
The wedge-coupling element system provides self-aligning and self-securing properties. The form-fitting connection between the coupling element and wedge, combined with the secure attachment to the latch block, creates a self-contained assembly that naturally maintains its configuration without requiring precise operational sequences or specialized assembly techniques.
4Stability of the object's composition
If the wedge is hammered in from the side, then the wedge secures the tongue block, but the installation becomes more difficult
Solution Approach 1:
The coupling element is designed to be pre-assembled or pre-positioned on the latch block before the wedge is inserted. This preliminary arrangement establishes the secure fixation framework in advance, allowing the wedge to be simply inserted into a prepared space rather than hammered in from the side, thereby simplifying the installation process while maintaining stabilization effectiveness.
Data Source
Figure 1
Figure 2~3
AI summary
The device has a closure plug, a closure piece and a tongue block (2), where the closure plug is actuated by a cam- or sliding bar. The closure plug is mounted in the tongue block in a pivoting manner. A switch rail is detachably connected with the tongue block and is locked at the tongue block by a wedge (11). The wedge is connected with the tongue block by a coupling element (16). The device is formed as latch or vertical clasp closure.