Press Stud Anti-Uncoupling Appendages
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Solution Overview
Problem
Existing press studs fail to effectively prevent accidental unfastening under lateral traction while maintaining ease of intentional fastening and unfastening, often resulting in bulky designs or increased force requirements, and pose risks of entanglement.
Innovation Solution
A press stud design featuring a male and female element with an elastic engagement ring and anti-uncoupling appendages that lock in place under lateral tension, allowing for secure fastening without bulkiness or increased force requirements, utilizing a tubular body with an annular groove and an outer lip to center the elastic ring and prevent accidental unfastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic engagement member is stiffened to increase grip on the male element, then the resistance to accidental unfastening under lateral traction is improved, but the ease of intentional fastening and unfastening deteriorates due to increased force requirements
Solution Approach 1:
The engagement member is segmented into distinct functional zones: a first portion with increased stiffness for gripping the male element during lateral traction, and a second portion with decreased stiffness for facilitating easy insertion and removal. This segmentation allows each zone to optimize its mechanical properties for its specific function, resolving the contradiction between security and ease of operation.
Solution Approach 2:
Different regions of the engagement member are assigned different local qualities in terms of stiffness. The first portion (engagement portion) has locally increased stiffness to provide secure gripping, while the second portion (proximal portion) has locally decreased stiffness to allow easy manipulation. This local differentiation of mechanical properties enables the engagement member to simultaneously satisfy both security and ease of operation requirements.
2Reliability
If the engagement member is made stiffer to prevent unfastening under lateral traction, then the security of fastening is improved, but the device complexity increases due to additional structural requirements
Solution Approach 1:
The engagement member employs a dynamic stiffness profile rather than uniform stiffness throughout. The varying cross-sectional dimensions create zones of different stiffness that adapt to the functional requirements at each location: stiffer where gripping is needed, more flexible where manipulation is required. This dynamic approach to stiffness distribution achieves security without requiring complex additional structures.
Solution Approach 2:
The cross-sectional dimensions of the engagement member are varied along its length to change the stiffness parameter locally. By reducing the cross-sectional area in the proximal portion and maintaining or increasing it in the engagement portion, the stiffness parameter is optimized for each function. This parameter variation achieves the security of fastening without increasing overall device complexity.
3Reliability
If additional engagement means are added to prevent lateral displacement, then the anti-uncoupling performance is improved, but the volume of the press stud increases due to bulkier structural elements
Solution Approach 1:
The engagement member serves multiple functions simultaneously: it provides the primary gripping function through its engagement with the male element, provides anti-uncoupling protection through its structured portions that resist lateral displacement, and facilitates easy manipulation through its flexible proximal portion. This multi-functionality is achieved within a single compact component without requiring additional bulkier structural elements.
Solution Approach 2:
The engagement member's structure is nested within the existing press stud housing, with the first and second portions arranged along the longitudinal axis. The varying cross-sectional dimensions allow the structure to be compact while still providing the necessary anti-uncoupling features. The engagement member fits within the confines of the housing without requiring additional external volume.
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 design provides reliable anti-uncoupling performance under lateral tension without increasing the size or complexity of the press stud, ensuring secure fastening and easy unfastening, while minimizing the risk of entanglement and maintaining straightforward operation.
Implementation Method 1
an elastically deformable engagement member mounted in the female element
Data Source
AI summary
A press stud comprises a male element and a female element. The male element comprises a coupling portion which is insertable into a housing seat of the female element in a coupling direction. The coupling portion of the male element has an anti-uncoupling appendage which interferes with the female element and prevents the uncoupling of the male element from the female element when they are subjected to tension acting in a substantially transverse direction with respect to the direction of coupling.