Railway Hatch Latch with Threaded Adjustment for Seal Wear
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Solution Overview
Problem
Existing railway car hatch cover latches fail to maintain a secure seal due to wear, leading to potential contamination and spillage of commodities during transportation.
Innovation Solution
A self-adjusting latch assembly with a threaded shaft, coil spring, and bent hooking rod mechanism that provides a compressive force to maintain a secure fit between the hatch cover and ring, allowing for adjustments to accommodate variations in the seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed latch mechanism is used, then the structure is simple, but the seal becomes insecure as the seal wears over time
Solution Approach 1:
The latch mechanism incorporates a threaded shaft that allows the position of the eye relative to the keeper to be adjusted. This dynamic adjustment capability enables the latch to compensate for seal wear by moving the eye to different positions along the threaded shaft, maintaining secure engagement despite changes in seal thickness over time.
Solution Approach 2:
The invention changes the positional parameter of the eye along the threaded shaft to adapt to varying seal conditions. By adjusting the distance between the eye and the latch plate through the threaded shaft mechanism, the system maintains optimal engagement force and seal pressure even as the seal material wears and changes dimension.
2Adaptability or versatility
If an adjustable latch mechanism is used, then the seal remains secure as the seal wears, but the device complexity increases
Solution Approach 1:
The threaded shaft provides a simple yet effective dynamic adjustment mechanism. The eye can be repositioned along the threaded shaft by rotating it, allowing the latch to adapt to different seal thicknesses and wear stages. This mechanical adjustment is straightforward and does not require complex systems, maintaining ease of operation while providing necessary adaptability.
Solution Approach 2:
The threaded shaft serves multiple functions: it positions the eye, provides adjustment capability, and maintains structural integrity. This multi-functional element reduces the need for separate adjustment mechanisms, thereby limiting the increase in overall device complexity while achieving the desired adaptability.
3Object-affected harmful factors
If the latch does not accommodate seal wear, then the structure remains simple, but contamination and spillage occur
Solution Approach 1:
The adjustable eye position on the threaded shaft allows the latch to maintain proper engagement force on the seal throughout its service life. By compensating for seal wear through positional adjustment, the system ensures continuous effective sealing, preventing contamination and spillage that would otherwise occur with a fixed latch mechanism.
Solution Approach 2:
The adjustment mechanism provides a form of manual feedback control, where the operator can observe seal engagement quality and adjust the eye position accordingly. This allows the system to respond to changing seal conditions and maintain optimal sealing performance, preventing harmful effects of improper sealing.
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
Ensures a consistent and secure seal, preventing contamination and spillage by maintaining a tight closure of the hatch cover, even as the seal wears over time.
Implementation Method 1
The keeper in turn supports and holds a coil spring between the eye and the keeper ears
Data Source
AI summary
The present railway car hatch cover latch assembly includes a latch plate. One end of the latch assembly rod is affixed to a bracket, with the adjustable end usually comprising an eye at the end of a threaded shaft. The threaded shaft is received in a keeper. The keeper in turn supports and holds a coil spring between the eye and the keeper cap. A bent hooking rod has two upturned ends that hold the end of the coil spring nearest the eye. The center of the bent hooking rod extends from the keeper to form a receiver. A latch plate includes a pivot rod that extends through the receiver of the bent hooking rod. The latch paddle itself contacts and holds the hatch cover is a compressively closed position against the railway car hatch ring.