Railcar Coupler Key Retainer With Internal Force Distribution
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Solution Overview
Problem
Existing coupler key retainers in railcars are prone to shifting or separating due to lateral forces during train movements, and they lack a simplistic design for improved force distribution and visual inspection, with conventional systems mounting the key retainer on the yoke, which is inefficient.
Innovation Solution
A coupler key retainer apparatus with a key stop secured to the interior surface of the railcar sill, featuring a flange portion projecting through a slot and a locking member that wedges into aligned bores in the key stop and retainer, distributing lateral forces internally and allowing easy visual inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the key retainer is mounted on the exterior surface of the sill side wall, then the coupler key can be retained, but lateral forces during violent in-train events are not effectively distributed and visual inspection is difficult
Solution Approach 1:
The key retainer is inverted from the conventional exterior mounting to an interior mounting on the sill side wall. The key stop is positioned inside the sill with a flange that extends through the slot, allowing the retainer to be accessed and inspected from the interior side, thereby improving visual inspection accessibility while maintaining key retention functionality.
2Reliability
If the key retainer is mounted on the exterior surface of the sill, then the coupler key can be secured, but lateral forces are concentrated on the exterior surface leading to instability
Solution Approach 1:
The key retainer structure is extended into the interior dimension of the sill, with the key stop positioned inside the sill and the flange extending through the slot. This dimensional change allows lateral forces to be distributed across both the interior and exterior surfaces of the sill, improving force distribution and stability rather than concentrating forces on the exterior surface only.
3Reliability
If a conventional key retainer assembly is used with a pin through aligned openings, then the coupler key is prevented from separating, but the design complexity increases and repair becomes difficult
Solution Approach 1:
The key retainer assembly is segmented into distinct functional components: the key stop with its flange and through bore, the retainer mounted on the sill, and the locking member. This segmentation allows each component to be independently manufactured and assembled, reducing overall design complexity while maintaining the reliability of preventing key separation through the coordinated action of these modular parts.
4Stability of the object's composition
If the key stop flange projects through the slot, then lateral forces are distributed internally, but the through bore requires precise alignment with the retainer
Solution Approach 1:
The through bore in the key stop flange is positioned to align with the retainer's through bore during the assembly process. This preliminary positioning ensures that when the locking member is installed, the alignment is already established, reducing the precision requirements during final assembly while maintaining the internal force distribution benefits of the projecting flange.
Data Source
AI summary
An apparatus for maintaining a railcar coupler key in position to releasably secure a railcar coupler shank to a yoke accommodated in a sill of a railcar. The railcar coupler key retainer apparatus includes an elongated key stop adapted to be releasably secured against an interior surface of a sill side wall defining an elongated slot. The key stop is configured with a flange portion which projects beyond an exterior surface of the sill side wall defining the slot. The flange portion defines a through bore having a closed margin. A retainer is mounted to the exterior surface of the sill side wall defining the elongated slot and defines a through bore which aligns with the through bore in the flange portion of the key stop when the key stop abuts with a closed end of the elongated slot defined by the side wall of the sill. A locking member is received in the through bores in the key stop and retainer to releasably secure the key stop to the interior surface of the sill side wall and thereby maintaining the railcar key retainer apparatus in position to maintain the railcar coupler key between the side walls of the sill and in position to secure the yoke to the coupler shank.