Railway Signal Mounting Joint With Tilt Adjustment for High Winds
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Solution Overview
Problem
Current top mast designs for railway wayside signals are susceptible to high wind failures, serviceability issues, and shipping damage, leading to signal outages and excessive train delays due to insecure connections and complex maintenance requirements.
Innovation Solution
A mounting arrangement featuring an attachment member and a connecting member with secure fastening elements, such as adjusting studs, that provide a strong and adjustable connection, allowing ±2.5º tilting motion for accurate alignment, and accessible bolt heads for easy maintenance, using aluminum components with T6 heat treatment for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If current top mast designs are used to mount railway signal heads, then the mounting structure can be assembled, but the connection is susceptible to high wind failures and shipping damage
Solution Approach 1:
The mounting arrangement is divided into separate members (first member attached to post, second member for signal head) connected by multiple independent fastening elements, allowing each component to be optimized for its specific function while distributing mechanical loads across multiple connection points
Solution Approach 2:
Multiple fastening elements (bolts, nuts, washers) are combined into a unified fastening system that secures both members together, creating a composite structure with enhanced strength and reliability that exceeds the sum of individual components
2Ease of repair
If current top mast designs are used, then the signal head can be mounted, but serviceability and maintenance are difficult due to inaccessible connections
Solution Approach 1:
The mounting arrangement separates the fastening elements into accessible positions where bolt heads are located on the second member for easy access during maintenance, while the nut portions remain secured on the first member, allowing independent serviceability of connection components
Solution Approach 2:
The design allows maintenance personnel to service the connection by simply accessing the bolt heads from the outside without disassembling the entire mounting structure or signal head, enabling quick retightening and inspection of fastening elements
3Reliability
If the connection between members is made stronger to prevent high wind failures, then reliability improves, but the complexity of the mounting arrangement increases
Solution Approach 1:
The first and second members are provided with specific local features (opening, extensions, fastening element positions) at precise locations to optimize the connection geometry and load distribution, achieving high reliability without requiring complex overall structure
Solution Approach 2:
The mounting arrangement uses standard fastening elements (bolts, nuts, washers) that serve multiple functions: securing members together, allowing adjustment, enabling maintenance, and distributing loads, thereby achieving high reliability through simple, versatile components rather than complex specialized parts
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 solution provides a secure, adjustable, and maintainable mounting system that withstands high winds and facilitates easy access for retightening, reducing the risk of signal failures and maintenance complexities, ensuring reliable signal visibility and operation.
Implementation Method 1
The attachment member and the connecting member are connected to each other by a plurality of connections or joints 106. Each connection or joint 106 comprises a fastening element 110
Implementation Method 2
using aluminum components with T6 heat treatment for enhanced strength
Data Source
AI summary
A mounting arrangement (100) includes an attachment member (102) for attachment to an end of a post (114), a connecting member (104) coupled to the attachment member (102), and a plurality of fastening elements (110) coupling the connecting member (104) to the attachment member (102), each fastening element (110) comprising a longitudinal axis (110A), longitudinal axes (110A) of the plurality of fastening elements (110) being substantially parallel to each other. The connecting member (104) is coupled to the attachment member (102) in a direction defined by the longitudinal axes (110A) of the plurality of fastening elements (110), wherein the attachment member (102) and the connecting member (104) comprise mating cylindrical surfaces (118, 140) which allow a tilting motion of the connecting member (104) about a rotating axis which is perpendicular to the longitudinal axes (110A) of the plurality of fastening elements (110).