Self-Aligning Fastener Clip for Low Insertion, High Retention
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Solution Overview
Problem
Conventional fasteners for attaching vehicle panels to a chassis require high insertion force and low extraction force, are prone to misalignment and wing breakage, and fail to self-align with variations in slot size, location, or sheet metal thickness, leading to issues like buzzing, rattling, and corrosion under environmental conditions.
Innovation Solution
A fastener clip with projections that engage a chassis slot, featuring a retention mechanism with barbs and a springing action that allows low insertion force and high extraction force, ensuring secure attachment and alignment despite variations in chassis and panel dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional fasteners are used to attach body panels to chassis, then the panels can be secured to the chassis, but high insertion force is required and extraction force is relatively low
Solution Approach 1:
The fastener incorporates a spring element that dynamically adjusts during insertion and retention. The spring compresses during low-force insertion and maintains continuous contact pressure on the retention ribs, providing high extraction force through elastic recovery while accommodating variations in installation conditions and environmental factors.
Solution Approach 2:
The fastener combines multiple materials with different properties: a polymeric body providing flexibility and corrosion resistance, metal retention ribs for high strength engagement, and a spring element for dynamic force application. This composite construction enables simultaneous achievement of low insertion force and high retention force.
2Ease of manufacture
If conventional single piece fasteners are used, then manufacturing is simpler, but they are prone to misalignment and wing breakage when slot positioning varies
Solution Approach 1:
The fastener is divided into distinct functional segments: a polymeric body, separate retention ribs with engagement features, and an independent spring element. This segmentation allows each component to be optimized for its specific function and accommodates misalignment through independent movement of the retention ribs within the polymeric body.
Solution Approach 2:
The fastener design incorporates geometric parameters that accommodate variation: the retention ribs have flexible mounting positions within the polymeric body, the engagement features include tolerance zones, and the spring element compensates for dimensional variations in the slot positioning through elastic deformation.
3Ease of operation
If conventional fasteners are used, then they provide basic fastening function, but they do not self-align and are prone to wing breakage under misalignment conditions
Solution Approach 1:
The fastener incorporates self-aligning features including guide surfaces on the retention ribs that automatically orient the fastener correctly during insertion, and a spring element that applies continuous pressure to maintain proper engagement. The design eliminates the need for precise manual alignment and prevents wing breakage through self-correcting geometric constraints.
4Object-affected harmful factors
If conventional fasteners are used, then they can be installed on vehicle chassis, but they produce buzzing, rattling, and noise under vibration and environmental conditions
Solution Approach 1:
The spring element provides continuous contact pressure on the retention ribs, maintaining constant engagement force between the fastener and chassis slot. This continuous active engagement prevents loosening under vibration, eliminates gaps that cause buzzing and rattling, and ensures sustained attachment security throughout the vehicle's operational life.
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 fastener clip provides ergonomic installation with reduced effort, high retention force, and minimizes noise and wear by self-aligning and securely fastening panels to the chassis, even under varying environmental conditions.
Implementation Method 1
featuring a retention mechanism with barbs and a springing action that allows low insertion force and high extraction force
Implementation Method 2
projections that engage a chassis slot, featuring a retention mechanism with barbs
Data Source
Figure 1
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AI summary
A fastener clip engages a slot in a chassis. The fastener clip comprises a pair of sides joined at a head portion. At least two projections are configured to engage a slot in a chassis and to secure the fastener clip to the chassis. The projections are attached to a head portion along the top portion of each of the projections on opposite sides of the clip. The projections are also attached to the foot portion along the width of the bottom portion of each projection, on opposite sides of the clip, such that the projection is affixed to the side. The bottom portion has a width more than the width of the top portion on the at least two projections. A bend along the width of the bottom portions of the projections engage the chassis to secure the clip to the slot in an engaged position.