Harsh Environment Buckle Assembly with Segmented Pawl Mechanism
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Solution Overview
Problem
Buckle assemblies in personal restraint systems face operational issues in harsh environments due to contamination, which can restrict movement of release components and require substantial maintenance, leading to reliability and efficiency problems.
Innovation Solution
The buckle assembly design includes a release actuator that applies increased force via a biasing member and a pawl mechanism, allowing for reliable engagement and disengagement of the web connector, with an ejector to facilitate insertion and ejection, and a switch for enhanced condition indication, reducing the impact of contaminants and improving operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional buckles with multiple internal components are used, then releasable engagement is provided, but contamination restricts movement of release components
Solution Approach 1:
The buckle is divided into separate functional components: a stationary body, a movable tongue with latch mechanism, and a release button. This segmentation allows the tongue and latch to operate independently from the release mechanism, reducing the impact of contamination on release component movement while maintaining reliable engagement.
Solution Approach 2:
The release button is extracted as a separate actuating component that operates the latch mechanism through a simplified connection. This extraction allows the release button to be designed with minimal internal moving parts, reducing susceptibility to contamination while maintaining the releasable engagement function.
2Reliability
If conventional buckles with multiple internal components are used, then releasable engagement is provided, but contamination restricts insertion of the tongue
Solution Approach 1:
The engagement mechanism is segmented into a stationary body opening and a movable tongue with integrated latch. This segmentation creates a clear insertion path for the tongue while isolating the latch mechanism to operate within the body, reducing contamination interference during insertion.
Solution Approach 2:
The tongue is pre-formed with a latch portion that automatically engages with the body upon insertion. This preliminary configuration of the tongue geometry ensures proper alignment and engagement before the release mechanism is activated, simplifying the insertion process and reducing sensitivity to contamination.
3Reliability
If cleaning, repairing or replacing buckles is performed to address contamination, then operational reliability is restored, but substantial time and expense are required
Solution Approach 1:
The buckle design incorporates a self-cleaning feature where the movable tongue and latch mechanism automatically clear contaminants during normal operation. The relative movement between components creates cleaning action that removes mud, sand, and other contaminants, maintaining operational reliability without requiring external maintenance intervention.
Solution Approach 2:
The surface properties of the buckle components are modified with contaminant-resistant coatings or surface treatments that change the friction and adhesion parameters. This allows contaminants to be more easily shaken off or rinsed away, reducing maintenance time and expense while maintaining reliable operation.
4Reliability
If conventional buckles with multiple internal components are used, then releasable engagement is provided, but the complexity increases maintenance requirements
Solution Approach 1:
The release mechanism is extracted and simplified to consist of a single release button that directly actuates the latch without requiring multiple internal springs, cam followers, or complex linkages. This extraction reduces the number of internal components while maintaining the releasable engagement function, thereby reducing maintenance requirements.
Solution Approach 2:
Multiple functions are merged into fewer components: the tongue serves as both the inserting element and the latch actuator, while the release button integrates the release mechanism directly into the tongue assembly. This merging reduces the total number of separate components that require maintenance while preserving the releasable engagement capability.
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 ensures reliable operation in harsh environments by providing increased force for overcoming contamination-induced friction and offering accurate status indication, reducing maintenance needs and enhancing overall system reliability.
Implementation Method 1
a biasing member operably positioned between the release actuator and the pawl
Data Source
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AI summary
Buckle assemblies for personal restraint systems and associated systems and methods are disclosed herein. In one embodiment, a buckle assembly includes a release actuator that can apply a first force and a second force to release a web connector. The release actuator is slidably coupled to a frame that includes a pair of opposing openings. A pawl is pivotally mounted to the frame via the opposing openings and includes a latch portion positioned to releasably engage the web connector. A biasing member is operably positioned between the release actuator and the pawl, and the release actuator is movable to compress the biasing member and exert the first force against the pawl. The release actuator is also movable to contact the pawl to exert the second force against the pawl. The first and second forces urge the pawl to rotate and disengage the latch portion from the web connector.