Third Rail Paddle Assembly for Variable Rail Spacing

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Solution Overview

Problem

Existing third rail systems face issues with uneven vertical and lateral spacing, leading to improper tracking and potential damage of current collectors and ice scrapers due to variances in the rail route, resulting in inefficient power transfer and maintenance challenges.

Innovation Solution

A third rail paddle system with a support assembly, pivot connection, and paddle assembly that allows for adjustable vertical and lateral movement, featuring a stop element, shear element, and elastic elements to manage movement and prevent damage, ensuring consistent contact with the third rail.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed third rail interface device is used, then the structure is simple, but the device cannot adapt to vertical and lateral spacing variations, resulting in improper tracking and potential damage

Engineering Contradiction:

Improveadaptability to spacing variationsVSAvoiddevice structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies the dynamics principle by transforming the fixed third rail interface device into a movable one. The paddle assembly is connected through a pivot connection that allows up and down movement, enabling the device to dynamically adapt to vertical spacing variations. The stop element limits the range of movement to prevent excessive displacement, while maintaining the ability to adjust to different rail positions.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the paddle assembly is allowed to move freely to accommodate spacing variations, then adaptability improves, but the risk of damage from excessive movement increases

Engineering Contradiction:

Improverange of movementVSAvoiddamage prevention

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies beforehand cushioning by introducing a stop element that limits the range of movement of the paddle assembly. This stop element prevents the paddle from moving beyond safe boundaries, cushioning against potential damage from excessive movement while still allowing sufficient travel to accommodate normal spacing variations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent applies the disposable principle through the use of a shear element that is designed to fail in a controlled manner. The shear element acts as a sacrificial component that can break to protect more critical parts of the system, providing a cheap failure mode that prevents catastrophic damage to the overall device.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If a shear element is added to prevent damage, then reliability improves, but device complexity increases

Engineering Contradiction:

Improvecontrolled detachmentVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The shear element is designed as a disposable, sacrificial component that fails in a controlled manner to protect the overall system. It is a simple, inexpensive element that can be easily replaced, providing reliable damage prevention without adding significant complexity to the device architecture.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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

The system ensures reliable contact and reduced damage by allowing for adjustable movement and controlled detachment, improving power transfer efficiency and maintaining system integrity across varying rail conditions.

Implementation Method 1

The lateral pivot assembly includes an elastic element that biases the lateral pivot assembly and paddle assembly towards a center of a range of lateral pivoting of the paddle assembly

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

The paddle assembly includes a shear element configured to shear upon application of a determined force to a side of the paddle for either the paddle to detach from the arm unit or the arm unit (and thereby the entire paddle assembly) to detach from the pivot connection

Methodology Applied

Scientific EffectShear stress: Shear Stress

Data Source

PatentUS11938829B2Third rail paddle system

Publication Date: 2024.03.26 TRANSTECH OF SOUTH CAROLINA INC

AI summary

A third rail paddle system includes a support assembly configured for attachment to a vehicle, a pivot connection attached to the support assembly and that defines a range of up and down movement, and a third rail paddle assembly having an arm unit and a paddle. The paddle assembly is attached to the pivot connection for the paddle to contact a third rail and move up and down relative to the third rail when the support assembly is attached to the vehicle. One of the pivot connection, the paddle assembly, or the support assembly includes a stop element that limits the range of the up and down movement and prevents the paddle assembly from moving downwards to a bottom of the range of movement.