Third Rail Bracket Deflects Shoe Impact
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Solution Overview
Problem
Existing bracket systems for electrified railway third rails are labor-intensive and expensive to install, prone to damage from the railway carriage's contact shoe, and lack a convenient safety flag holder attachment mechanism.
Innovation Solution
A support bracket with a unitary, C-shaped design featuring a lower limb mounted to the rail, an upper limb for suspending a protective cover, and protrusions with tapered and planar surfaces to deflect the contact shoe, along with a flag holder that can be easily attached to both conventional and innovative brackets, made from non-conductive materials for safety and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional brackets are used to support cover boards on third rails, then protection is provided, but installation is labor-intensive and expensive
Solution Approach 1:
The bracket is divided into modular components: a U-shaped main body with integrated mounting features, separate cover boards, and detachable flag holder assemblies. This segmentation enables pre-fabrication and rapid assembly on-site, reducing installation time and labor costs while maintaining structural integrity and protection functionality.
2Reliability
If conventional brackets are used to support cover boards, then protection is provided, but the brackets are liable to be damaged by the contact shoe
Solution Approach 1:
The bracket incorporates a protrusion extending from the connecting section that acts as a preliminary defensive element against contact shoe impact. This protrusion deflects the shoe upward before it can strike the vulnerable bracket-body junction, preventing damage while maintaining the protective cover function.
Solution Approach 2:
The design converts the harmful impact force from the contact shoe into a beneficial deflection mechanism. The protrusion uses the shoe's own motion to redirect it away from critical structural areas, transforming a damaging interaction into a protective action that preserves bracket integrity.
3Adaptability or versatility
If conventional brackets are used, then support function is provided, but safety flag holder cannot be readily mounted or detached
Solution Approach 1:
The bracket is designed with universal mounting features including a standardized socket and ear structure that can accommodate both the protective cover boards and the safety flag holder assembly. This multi-functionality allows a single bracket design to serve multiple purposes, enabling easy attachment and detachment of the flag holder while maintaining structural support functions.
Data Source
AI summary
A cover assembly includes a support bracket from which a cover board is selectively suspended. The support bracket is itself mounted to a third rail or contact rail by a clip which cooperates with the bracket. The cover board is held in place on the bracket by an upper flange which has a tapered or V-shaped front wall, as well as a tapered bottom wall. A flag holder, which can be selectively attached to the bracket, includes a first section with an engaging member that cooperates with an engaging member located on the support bracket, a center section including a through bore for holding a flagstaff of a safety flag and a second end section. The second end section is adapted to attach the flag holder to a different type of cover board support bracket.