U-Base Fastener With Folded Barb And Spring Arms
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Solution Overview
Problem
Existing U-base fasteners face issues with retention force, ease of manufacturing, durability, and cost, particularly in vehicle applications, where the insertion and removal forces are critical, and the design often results in loose connections due to barb orientation.
Innovation Solution
The U-base fastener design incorporates a U-shaped body with spring arms and barb extensions that are bent to create a central cavity for rib retention, featuring a unique barb configuration with angled and flat sections to increase surface area contact, preventing sinking into the rib and ensuring secure connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional barb configuration is used in U-base fasteners, then manufacturing is simple, but retention force is insufficient and loose connections occur
Solution Approach 1:
The barb is designed with non-uniform geometry featuring a leading angled section and a trailing flat section, creating different local properties along its length. The angled leading section provides initial engagement and guidance, while the flat trailing section maximizes contact area and retention force, resolving the contradiction between simple configuration and high retention force
Solution Approach 2:
The barb incorporates curved and angled surfaces rather than straight geometric forms. The angled leading section and curved transition to the flat trailing section create optimized stress distribution and contact geometry, improving retention force while maintaining manufacturability through standard forming processes
2Strength
If barb angle is increased to improve retention, then retention force increases, but insertion force also increases
Solution Approach 1:
The barb design creates a dynamic engagement process where the leading angled section first contacts the rib at a shallower effective angle during insertion, reducing initial insertion force. As the fastener is fully inserted, the trailing flat section engages at a more favorable angle for maximum retention force, thus resolving the contradiction between insertion force and retention force
3Reliability
If barb surface area is increased to prevent sinking, then retention reliability improves, but manufacturing complexity increases
Solution Approach 1:
The barb transitions from a simple cylindrical form to one with varied cross-sectional parameters along its length, featuring an angled leading section that tapers to a flat trailing section with larger surface area. This parameter variation prevents sinking into the rib while maintaining compatibility with standard stamping and forming processes, resolving the contradiction between reliability and manufacturing ease
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 enhances retention force, reduces the likelihood of loose connections, and improves durability while maintaining ease of manufacturing and cost-effectiveness, suitable for various vehicle components.
Implementation Method 1
U-base fastener with folded barb and multiple spring arms
Data Source
AI summary
A resilient U-base fastener includes a U-shaped body defining a central body cavity between a first side and a second side. The first side is connected to the second side at an insertion end. The U-base fastener also includes a first spring arm connected to the first side of the body that bends outwardly and away from the central body cavity at a first bend and a second spring arm connected to the first side of the body adjacent the first spring arm. The second spring arm bends outwardly and away from the central body cavity at a second bend. The first spring arm and the second spring arm are laterally spaced apart from one another and are separated by a gap in the first side of the body. The gap extends toward the insertion end past the first bend and past the second bend.