C-Shaped Clip and Nut Assembly for Tool-Free Secure Mounting
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Solution Overview
Problem
Existing fastener assemblies for securing components like air cleaner housings to vehicles or machines require tools for attachment and do not effectively distribute clamp loads, leading to potential plastic relaxation and assembly challenges.
Innovation Solution
A clip and nut assembly with a C-shaped clip component and a nut component, featuring a snap-fit configuration that allows attachment to mounting brackets without tools, distributing clamp loads uniformly across the mounting features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional fastener assemblies are used to secure components, then the attachment strength is sufficient, but tools are required for attachment and clamp loads are not uniformly distributed
Solution Approach 1:
The fastener assembly is designed to be self-installing through a snap-fit mechanism where the C-shaped clip component engages with the mounting bracket without requiring external tools. The resilient retention tab automatically secures the clip to the bracket when pressed together, enabling tool-free attachment while maintaining secure connection.
Solution Approach 2:
The fastener assembly is divided into distinct functional components: a C-shaped clip component for engagement, a resilient retention tab for securing, and a nut component for fastening. This segmentation allows each component to perform its specific function optimally while working together to achieve both easy installation and secure attachment.
2Strength
If traditional fastener assemblies are used, then attachment is achieved, but clamp loads are concentrated causing plastic relaxation
Solution Approach 1:
The C-shaped clip component introduces a new geometric dimension for load distribution. By forming the clip in a C-shape with specific curvature and thickness variations, the design distributes clamp loads across multiple contact points along the arc of the C-shape, transforming concentrated point loads into distributed line loads that reduce stress on the mounting bracket.
Solution Approach 2:
The resilient retention tab is designed with specific material properties and geometric parameters that enable it to deform elastically under load. The tab's thickness, length, and curvature are optimized to provide compliance that absorbs and distributes clamp loads uniformly, preventing localized stress concentrations that would cause plastic relaxation in the mounting bracket.
3Ease of operation
If a C-shaped clip with retention tab is used for tool-free attachment, then ease of assembly is improved, but the device complexity increases
Solution Approach 1:
The clip component and retention tab are merged into a single integrated C-shaped component rather than separate parts. This merging reduces the number of components that need to be handled during assembly while maintaining the snap-fit mechanism's ease of installation. The integrated design simplifies the assembly process by reducing part count without sacrificing the tool-free attachment capability.
4Adaptability or versatility
If the retention tab is curved over the lower plate, then captive fastener functionality is achieved, but manufacturing complexity increases
Solution Approach 1:
The retention tab's curvature is designed with specific geometric parameters that enable it to function as a captive fastener mechanism. By optimizing the tab's arc radius, thickness, and attachment point locations, the design achieves the desired snap-fit and retention functionality while maintaining compatibility with standard manufacturing processes for metal forming and stamping.
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
Enables secure attachment of components without tools, minimizes plastic relaxation by uniform load distribution, and accommodates various mounting configurations, enhancing assembly efficiency and strength.
Implementation Method 1
a resilient retention tab that is curved over the lower plate
Data Source
AI summary
A clip and nut assembly that includes a generally C-shaped clip component having a lower plate with an upper surface, a retention tab extending from and curved over the lower plate so that a lower surface of the retention tab is facing and spaced from the upper surface of the lower plate, and a first aperture extending through the lower plate. The clip and nut assembly further includes a nut component having a first nut portion sized to fit within the first aperture and a second nut portion extending from the first nut portion.