Rail Clip Asymmetric Wedge Base for Rotational Stability
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Solution Overview
Problem
Existing rail fasteners, such as the DE clip and U.S. Pat. No. 4,313,563, fail to provide effective rotational restraint and are prone to misalignment and damage due to their design incompatibility with K plate slots, leading to inefficiencies and increased maintenance costs.
Innovation Solution
A U-shaped rail clip with a curved back and tapered arms, featuring a base that contacts the K slot's upper interior surface and has a leading edge that wedges into the slot's arcs, providing line contact and rotational resistance, and a design that allows for easier installation without side squeeze tools, using a channel and gate mechanism to secure the clip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DE clip is used with the K plate slot, then the rail can be held down, but the clip rotates within the slot causing misalignment and damage
Solution Approach 1:
The clip base is designed with an asymmetric configuration where the leading edge is positioned to contact the upper interior surface of the slot at an angle, creating a wedge-shaped contact area. This asymmetric geometry prevents rotational movement by ensuring that the contact points are not symmetrically distributed, thereby eliminating the rotation problem while maintaining rail restraint.
Solution Approach 2:
The leading edge of the clip base is designed with a curved surface that contacts the upper interior surface of the slot along a line rather than at a point. This curved geometry distributes the contact force and creates a line of contact that resists rotational movement, improving rotational stability while reducing stress concentration that causes damage.
2Ease of manufacture
If the clip base is shaped to match the circular arcs on the top of the slot, then the clip can be installed, but rotational location is poor and alignment is lost
Solution Approach 1:
The clip base incorporates an asymmetric leading edge that contacts the slot surface at an angle, creating a self-aligning wedge effect during installation. This asymmetric design ensures that the clip automatically orients itself correctly within the slot, maintaining alignment precision while remaining easy to install.
Solution Approach 2:
The leading edge of the clip base is designed to engage with the upper interior surface of the slot first during installation, creating a preliminary alignment action that guides the rest of the clip into proper positioning. This preliminary contact establishes correct alignment before the remaining parts of the clip are fully installed.
3Device complexity
If the slot height is fixed in the K plate, then the plate structure is simple, but the plate form rail clip cannot perform effectively
Solution Approach 1:
The clip base is designed with a curved leading edge that contacts the upper interior surface of the slot along a line, creating a wedge-shaped contact area. This curved geometry allows the clip to effectively utilize the fixed slot height while providing superior rotational restraint and performance compared to flat-based designs.
Solution Approach 2:
The clip base geometry is optimized by changing the parameters of the leading edge contact surface, creating a wedge-shaped configuration with specific angular characteristics. This parameter optimization allows the clip to perform effectively in fixed-height slots while maintaining structural simplicity.
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 reduces track maintenance costs, enhances rotational stability, and simplifies the installation process, ensuring better performance and longevity of the rail fastening system, even with existing K plates and concrete ties.
Implementation Method 1
the base being adapted to fit in the slot of the rail clip support, the base of said clip being characterised as having a leading edge remote from the arms that contacts the upper interior surface of said slot to form at least a line of contact with the surface of said slot
Implementation Method 2
two tapered arms, said arms being bent inwardly beyond the base in a large arc and the tips are bent back toward the base and oriented for contact with the foot of said rail
Data Source
AI summary
A rail fastening clip is used with a rail clip support having a rail clip slot of the kind used in K plates. The rail clip is formed from a U shaped member made of metal plate having a base and two arms tapered from the base to their tips, with the arms being bent inwardly beyond the base in a large arc and the tips are bent back toward the base and oriented for contact with the foot of the rail. The base is adapted to fit in the K plate slot of the rail clip support. The base of the clip has a leading edge remote from the arms that contacts the upper interior surface of the support slot to form at least a line of contact with the upper interior surface of the slot. The line of contact is about 6 mm. The design overcomes the problem of rotation of the clip within the support slot and is a more cost effective clip than that currently used with K plates.