Stamped Retention U-Nut With Compression-Limiting Clip Structure
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Solution Overview
Problem
Existing clip designs for securing components often rely on elastic deformation, leading to material fatigue, permanent deformation, or failure, especially in sensitive applications, necessitating a clip that provides reliable retention while limiting maximum compression force.
Innovation Solution
A retention clip with a stamped-metal design featuring a U-shaped bend, a contact plate, and an internally-threaded collar, which includes a compression limiter to control the maximum compressive force, ensuring durable and consistent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional clip designs rely on elastic deformation to generate clamping force, then retention capability is improved, but material fatigue and permanent deformation occur leading to failure
Solution Approach 1:
The patent changes the fundamental mechanism from elastic deformation to controlled plastic deformation through the yield zone. The controlled elongation in the yield zone allows the clip to deform permanently in a controlled manner to generate clamping force, avoiding the cyclic fatigue inherent in elastic deformation designs. This parameter change from elastic to plastic deformation regime resolves the contradiction between retention capability and service life.
2Strength
If excessive compression is applied to secure components, then retention strength is improved, but material fatigue and permanent deformation occur
Solution Approach 1:
The patent segments the clip into distinct functional zones: a yield zone designed for controlled plastic deformation, transition zones for stress distribution, and clamping zones for force application. This segmentation allows excessive compression forces to be concentrated in the yield zone where they cause controlled deformation rather than widespread fatigue, while the transition zones distribute stresses to prevent permanent deformation in critical areas.
Solution Approach 2:
The yield zone acts as a predetermined cushioning element that absorbs excessive compression energy through controlled plastic deformation. By designing this zone beforehand with specific geometric features, the patent prevents harmful stress concentrations from reaching other parts of the clip, thereby cushioning against material fatigue before it can propagate.
3Object-affected harmful factors
If controlled maximum compressive force is applied, then protection of delicate components is improved, but retention reliability may be compromised
Solution Approach 1:
The patent applies local quality by creating different geometric properties in different zones of the clip. The yield zone has specific cross-sectional dimensions and curvature designed to limit compressive force, while the clamping zones have geometric features optimized for reliable retention. This local differentiation allows the clip to protect delicate components from excessive compression while maintaining reliable retention through properly designed clamping surfaces and engagement features.
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 clip ensures reliable retention and durability by limiting excessive compression, protecting delicate components and maintaining consistent performance over repeated use.
Implementation Method 1
Traditional clip designs often rely on elastic deformation to generate a clamping force
Data Source
AI summary
Described is a stamped-metal retainer clip for attaching a first component having a first opening relative to a second component having a second opening. The retainer clip includes a first planar portion, a second planar portion, a contact plate, and a fastener plate. The first planar portion and the second planar portion are resiliently connected via a first U-shaped bend. The contact plate is resiliently coupled with the second planar portion via a second U-shaped bend and includes a fastener opening to receive a fastener and a component-engagement feature to engage the first opening. The first planar portion and the second planar portion are spaced to define a channel configured to receive the first component. The fastener plate is resiliently coupled with the second planar portion via an angled bend and includes an internally-threaded collar to threadedly engage the fastener. Each of the contact plate and the fastener plate is positioned between the first planar portion and the second planar portion.