Railway Frog Assembly with External Ramping

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Solution Overview

Problem

Railroad turnout frogs require complex and costly custom machining, leading to high maintenance costs and wear, especially due to the need for large castings with intricate ramping designs to accommodate wheel transitions and high-speed rail operations.

Innovation Solution

The design incorporates ramping into the rail portion outside the main body casting, eliminating the need for a toe-side frog casting and using a simpler heel-side frog with angled rails and risers to maintain a horizontal wheel path, reducing the size and complexity of the frog casting and allowing for easier assembly and maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dual frog castings with complex ramping designs are used to accommodate wheel transitions, then wheel path support and capture functionality is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improvewheel path support and capture functionalityVSAvoidcasting complexity and manufacturing cost

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the ramping function from the frog casting and relocates it to the rail portion. The frog casting is simplified to only provide capture functionality, while the ramping is implemented through angled rails and risers that are separate components. This separation reduces the complexity of the frog casting while maintaining the overall functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the frog assembly into distinct functional components: the frog casting for capture, the angled rails for ramping, and the risers for elevation. This segmentation allows each component to be optimized independently, with the frog casting being simpler and easier to manufacture while the rail portion handles the complex geometric transitions.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If large castings with intricate ramping designs are used to extend ramping length, then wheel transition smoothness is improved, but production cost and material usage increase

Engineering Contradiction:

Improvewheel transition smoothnessVSAvoidcasting material and production cost

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses vertical risers to provide elevation change in addition to the horizontal ramping. This three-dimensional approach allows the wheel path to be extended and smoothed without requiring proportionally larger horizontal casting dimensions, thereby reducing material usage while maintaining transition smoothness.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If multiple castings with custom machining are used to provide required shaping, then mechanical action under high strain is improved, but manufacturing expense and time increase

Engineering Contradiction:

Improvemechanical action under high strainVSAvoidmanufacturing expense and time

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies different geometric properties to different parts of the system: the frog casting has a horizontal tread bearing surface for capture, while the rail portion has angled surfaces for ramping. This localization of specific geometric qualities allows each component to be manufactured with simpler, more standard operations rather than complex custom machining throughout.

Inventive Principle:

Principle #3Local quality

4Reliability

If frog castings are designed with integrated ramping, then wheel support is improved, but casting size and complexity increase

Engineering Contradiction:

Improvewheel supportVSAvoidfrog casting size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the frog assembly into distinct functional components: the frog casting for capture, the angled rails for ramping, and the risers for elevation. This segmentation allows each component to be optimized independently, with the frog casting being simpler and smaller while the rail portion handles the complex geometric transitions.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8424813B1Elevated frog and rail track assembly

Publication Date: 2013.04.23 CLEVELAND TRACK MATERIAL

AI summary

The invention is a frog panel assembly for a railway turn-out switch, as well as a rail intersection design and a frog casting therefor.