Rail Fastening Anchor Geometry for Simpler Clip Casting
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Solution Overview
Problem
Conventional anchoring devices for railway rail fastening systems are difficult to cast due to complex features, requiring significant machining and increasing manufacturing costs, and are often designed with overlapping upper and lower clip contact walls that are thought to be necessary for energy storage during clip movement.
Innovation Solution
The anchoring device features non-overlapping upper and lower clip contact walls, allowing for a simpler casting process without the need for inserts, and includes a protrusion for vertical adjustment, enabling the clip to move linearly from a wedged to an engaged position with a catch feature to prevent retreat, thus reducing material usage and machining needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional anchoring devices are designed with overlapping upper and lower clip contact walls, then energy storage during clip movement is improved, but manufacturing complexity and machining requirements increase significantly
Solution Approach 1:
The patent changes the geometric parameters of the clip contact walls by making them non-overlapping instead of overlapping. This parameter change maintains the energy storage function through proper positioning and spacing of the walls, while dramatically simplifying the manufacturing process and eliminating the need for complex machining operations.
Solution Approach 2:
Instead of following the conventional design approach where upper and lower clip contact walls overlap, the patent inverts this arrangement by making them non-overlapping. This inverted design achieves the same energy storage objective through alternative geometric configuration, thereby simplifying manufacturing without compromising functional performance.
2Reliability
If anchoring devices are designed with complex features for proper clip retention, then clip retention reliability is improved, but casting difficulty and machining requirements increase
Solution Approach 1:
The patent segments the anchoring device into distinct functional features: non-overlapping upper and lower clip contact walls, a protrusion for vertical adjustment, and a catch feature. Each segment performs a specific function that contributes to overall clip retention reliability, while the modular nature of these segments makes them easier to cast and manufacture compared to integrated complex features.
Solution Approach 2:
The patent changes key geometric parameters of the anchoring device features to optimize both retention reliability and manufacturability. The non-overlapping configuration of clip contact walls and the specific positioning of the protrusion and catch feature are parameter changes that enable reliable clip retention through simpler casting processes.
3Ease of manufacture
If non-overlapping clip contact walls are used, then manufacturing simplicity is improved, but energy storage capability during clip movement may be reduced
Solution Approach 1:
The patent compensates for the reduced energy storage in non-overlapping walls by utilizing the vertical dimension through the protrusion feature. This dimensional addition provides an extra mechanism for energy absorption and clip retention, balancing the energy storage capability despite the simplified horizontal wall configuration.
Solution Approach 2:
The protrusion acts as an intermediary element that supplements the energy storage function. While non-overlapping clip contact walls provide primary retention, the protrusion mediates additional energy absorption and positioning, ensuring adequate energy storage capability is maintained despite the manufacturing simplification.
4Manufacturing precision
If significant machining is performed on cast anchoring devices, then manufacturing precision is improved, but production time and costs increase
Solution Approach 1:
The patent applies preliminary action by designing the anchoring device features to be cast directly in their final positions and configurations. The non-overlapping clip contact walls, protrusion, and catch feature are all formed during the casting process itself, eliminating the need for subsequent machining operations to achieve dimensional precision, thereby significantly improving production efficiency.
Solution Approach 2:
The casting process itself provides the necessary dimensional precision through proper mold design and manufacturing. The anchoring device features are self-forming during casting, with the mold cavity defining the final geometry of non-overlapping walls, protrusion, and catch feature, eliminating the need for external machining services and improving overall productivity.
Data Source
AI summary
An anchoring device for use in retaining a railway rail fastening clip having first and second leg portions and a rail-bearing portion therebetween. The anchoring device includes a base member, an opening in the base member configured to receive a fastening component for fastening the anchoring device to an underlying foundation, and first and second clip-retaining sides extending from said base member with the first clip-retaining side being spaced apart from the second clip-retaining side so as to define a space therebetween for receiving the rail-bearing portion of the clip. Each clip-retaining side comprising upper and lower clip contact walls defining a passageway for receiving one of the leg portions, wherein the leg portions contact the clip contact walls of the respective clip-retaining sides as the clip moves from a wedged position towards an engaged position where the rail-bearing portion of the clip bears on the rail.