Railway Signal LED Retrofit Module With Spring-Loaded Connectors
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Solution Overview
Problem
Existing railway signal maintenance is hindered by the screw-in bulb receptacles, which pose installation and maintenance challenges, particularly when transitioning from incandescent bulbs to more efficient LED alternatives.
Innovation Solution
A railway signal replacement module with a lamp housing that contains a solid-state light source, featuring spring-loaded connectors for electrical connection and thermally conductive materials for heat dissipation, allowing for easy retrofitting and secure alignment within the railway signal housing without the need for a screw-in socket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If screw-in bulb receptacles are used in railway signals, then installation and maintenance can be performed with simple components, but the maintenance complexity increases and efficiency decreases when transitioning to LED alternatives
Solution Approach 1:
The railway signal lamp assembly is divided into separate functional modules: a reusable receptacle component and a replaceable lamp component. This segmentation allows the receptacle to remain installed in the signal housing while only the lamp module needs to be replaced during maintenance, significantly reducing maintenance complexity and improving efficiency when transitioning to LED alternatives.
Solution Approach 2:
The receptacle component is designed with universal compatibility to accommodate different lamp types (incandescent, LED, etc.) through standardized interfaces. The spring-loaded electrical connectors and alignment features enable the same receptacle to universally interface with various lamp modules, facilitating easier transitions between different lighting technologies without increasing maintenance complexity.
2Reliability
If spring-loaded connectors are used for electrical connection, then electrical contact reliability improves, but the device structure becomes more complex
Solution Approach 1:
The spring-loaded electrical connectors are integrated directly into the receptacle housing as a unified component rather than being separate parts. This merging of the connector function into the existing receptacle structure provides reliable electrical contact while minimizing the increase in overall device complexity. The spring-loaded contacts are built into the receptacle's interface features, creating a compact and reliable connection system.
3Temperature
If thermally conductive materials are added for heat dissipation, then thermal management improves, but the device complexity increases
Solution Approach 1:
Thermally conductive materials are applied locally at critical heat transfer interfaces within the lamp module, such as between the LED components and the housing or heat dissipation structures. This localized application provides effective thermal management where needed most, while avoiding the complexity of comprehensive thermal management systems throughout the entire device. The thermal conductivity enhancement is concentrated at specific points rather than distributed throughout the entire structure.
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
Facilitates efficient installation and maintenance by providing a secure, single-action snap-on or slide-in connection, improved thermal management, and enhanced performance with LED light sources, reducing maintenance complexities and leveraging existing electrical features of the railway signal.
Implementation Method 1
at least one spring-loaded connector integral to and positioned within or on the lamp housing to interface with an electrical conductor feature of a railway signal
Implementation Method 2
a thermally conductive material disposed on an exterior surface of the lamp housing to provide a thermal conduit from an exterior of the lamp housing to an interior of the railway signal housing
Data Source
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AI summary
A railway signal replacement lamp module apparatus, including a lamp housing sized to fit within a railway signal housing and a receptacle to contain a solid state light source within the lamp housing. Some embodiments include, in combination with other aspects, at least one spring-loaded connector integral to and positioned within or on the lamp housing to interface with an electrical conductor feature of a railway signal; and a thermally conductive material disposed on an exterior surface of the lamp housing to provide a thermal conduit from an exterior of the lamp housing to an interior of the railway signal housing.