Monolithic Fastener Clip Assembly with Frangible Compression Ring
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Solution Overview
Problem
Existing push-in fastener assemblies face challenges with the separation of compression rings during handling, requiring pre-installation steps and increasing the complexity and cost of assembly, especially when a seal against fluid infiltration is needed.
Innovation Solution
A monolithic fastener clip assembly is designed with a compression ring integrated via frangible connections, allowing the assembly to be manufactured in a ready-to-install condition, eliminating the need for pre-positioning and reducing the risk of ring separation during handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate compression ring is used with the fastener, then the sealing performance is improved, but the device complexity and assembly steps increase
Solution Approach 1:
The compression ring is integrated with the fastener body to form a single monolithic structure. The compression ring is positioned within the fastener and retained by friction fit and interference fit, eliminating the need for separate assembly steps while maintaining the sealing function.
Solution Approach 2:
The integrated compression ring serves multiple functions: it provides sealing against fluid infiltration, reduces insertion force by compressing the resilient legs, and maintains structural integrity during installation. This multi-functionality is achieved within a single unified component.
2Reliability
If the compression ring is pre-positioned on the fastener, then the sealing performance is improved, but the handling time and risk of separation increase
Solution Approach 1:
The compression ring and fastener are manufactured as a single integrated unit, eliminating the need for pre-positioning steps. The monolithic structure ensures the compression ring remains securely attached during handling and transportation without adding time to the installation process.
3Ease of manufacture
If the compression ring is integrated monolithically with the fastener, then the ease of manufacture is improved, but the device complexity increases
Solution Approach 1:
The fastener and compression ring are formed as a single monolithic body through injection molding or similar manufacturing processes. This integration simplifies production by eliminating separate assembly steps while the internal geometry provides the necessary structural complexity for functionality.
Solution Approach 2:
The compression ring is nested within the fastener body, with the ring positioned inside the hollow cylindrical structure. This nesting arrangement allows both components to be manufactured as one piece while maintaining the distinct functional zones of the fastener and compression ring.
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
This design simplifies the installation process, reduces handling time, and enhances sealing performance without the need for separate sealing rings, while maintaining robust attachment and reduced insertion force.
Implementation Method 1
the fastener having resilient retaining members that bend inwardly during insertion through the components to be fastened, and that expand or rebound outwardly when inserted fully through the final component
Implementation Method 2
The ring provides contact against the legs, compressing the legs for passing through both the ring and the panel or component
Data Source
AI summary
A push-in fastener clip assembly includes a fastener having deflectable legs and compression ring for sliding along the deflectable legs during installation, with the compression ring connected to the fastener by frangible connections that are broken as the fastener clip assembly is being installed. Slots in the fastener guide the broken frangible connections during installation of the fastener, limiting rotation of the compression ring.