Hollow Switch Tie Assembly for Curved Railway Tracks

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Solution Overview

Problem

Existing hollow switch ties are limited to straight track sections, lack compatibility with curved sections, expose switch machine components, require integrated solutions leading to inflexible replacements, conduct electrical currents, and are not customizable for track changes, complicating maintenance and increasing costs.

Innovation Solution

A configurable hollow switch tie assembly with adjustable rail fasteners, integrated switch machine components, electrical insulation, and customizable interface plates, allowing installation in both straight and curved tracks, protecting switch machine components, and enabling easy customization without replacing the entire tie.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If switch machine components are positioned between railway ties, then switching operations can be supported, but maintenance equipment cannot access the ties and rails, causing damage to switch components and increasing maintenance costs

Engineering Contradiction:

Improveswitching operation supportVSAvoiddamage to switch components from maintenance equipment

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The switch machine components (rods, mechanical parts) are nested inside the hollow interior cavity of the switch tie assembly. The hollow shell encloses these components, protecting them from external damage while allowing the switch tie to maintain its structural function. This nesting approach resolves the contradiction by placing the vulnerable components within the protective hollow structure.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If hollow switch ties are used to protect switch machine components, then component protection is improved, but the ties cannot be customized for curved track sections and various rail configurations

Engineering Contradiction:

Improveswitch machine component protectionVSAvoidcompatibility with curved tracks and various rail configurations

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The switch tie assembly is segmented into modular components: a hollow shell, multiple interface plates with different angular orientations, and support plates. The interface plates can be selectively installed at various positions around the hollow shell to accommodate straight tracks, curved tracks, and different rail configurations. This segmentation allows the same hollow shell to be adapted to multiple track types without compromising component protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The switch tie assembly incorporates adjustable and reconfigurable elements. Interface plates with different angular orientations can be installed or removed to dynamically adapt the assembly to various track geometries. The hollow shell maintains its protective function while the interface configuration can be changed based on whether the track is straight or curved, providing versatility without sacrificing reliability.

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If traditional solid switch ties are used, then installation is straightforward, but they conduct electrical currents and do not provide protection for switch machine components

Engineering Contradiction:

Improveinstallation simplicityVSAvoidelectrical insulation and component protection

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The switch tie uses a hollow shell structure that encloses switch machine components, providing physical protection. The hollow design also creates an electrical insulation barrier, preventing current conduction between rails. This shell approach maintains ease of installation while adding the required protection and electrical insulation properties that solid ties lack.

Inventive Principle:

Principle #30Flexible shells and thin films

4Adaptability or versatility

If the entire hollow switch tie is replaced to accommodate track changes, then track configuration can be updated, but installation time and costs increase significantly

Engineering Contradiction:

Improvetrack configuration flexibilityVSAvoidinstallation time for track changes

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The interface plates are segmented as separate, interchangeable components that can be independently replaced. When track configuration changes are needed, only the specific interface plate requiring reconfiguration needs to be removed and replaced, rather than replacing the entire hollow switch tie assembly. This segmentation dramatically reduces installation time and costs while maintaining full adaptability to different track configurations.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250320669A1Hollow Switch Tie Assembly for Railway

Publication Date: 2025.10.16 VOESTALPINE RAILWAY SYSTEMS NORTRAK LLC

AI summary

The disclosed solution generally relates to a hollow steel tie assembly for railway. The hollow steel tie assembly is generally configured to house switch machine components (e.g., switch rods). Further, the hollow steel tie assembly is configured with interface plates that enable the installation of varying configurations of rail fasteners. As such, the hollow steel tie assembly may be used for many types of rail, geometries, gauges, handedness, etc. Additionally, the hollow steel tie assembly is configured for use with existing as well as new switch machines. The hollow steel tie assembly comprises a shell configuration that provides ready access to internal components while maintaining support for top plates, rail fasteners, and attached rail. Further, the hollow steel tie assembly comprises electrically insulating layers in order to maintain electrical isolation between reciprocal rails.