Low-Profile Retainer Heat Stake Attachment
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Solution Overview
Problem
Current fastener designs for connecting automobile components, such as the B-pillar and appliqué, face challenges in limited packaging space, leading to weak tooling conditions, breakage, and visible defects due to molded features like doghouses and threaded bosses, which lack strength and robustness, and fail to meet tolerance control and low-profile design requirements.
Innovation Solution
A retainer assembly featuring a low-profile spring steel base with heat stake features and a nylon clip, allowing for 360-degree float or limited directional float, providing a robust and secure attachment without introducing read conditions or breakage, and simplifying mold design to accommodate small sizes and tolerance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If molded-in features like doghouses or threaded bosses are used for attachment, then connection between components is achieved, but visible defects (read conditions) and breakage occur due to cooling temperature differences and weak tooling conditions
Solution Approach 1:
The attachment system is divided into separate components: a molded retention feature in the appliqué and a separate retainer with heat stake attachment. This segmentation allows the molded feature to be simple and robust while the retainer provides the actual attachment mechanism, eliminating the need for complex molded-in doghouses or threaded bosses that cause defects.
Solution Approach 2:
The patent replaces traditional mechanical attachment methods (molded doghouses, threaded bosses) with a heat stake attachment system. The retainer is attached to the appliqué via heat staking, which creates a strong mechanical bond without requiring complex molded features that are prone to breakage and visible defects.
2Volume of moving object
If fastener size is reduced to fit limited packaging space, then space constraints are met, but tooling condition becomes fragile and strength is insufficient
Solution Approach 1:
The retainer design utilizes the depth dimension effectively with a low-profile configuration that provides adequate attachment strength without increasing the footprint. The heat stake attachment method creates strong bonds within the limited space available, eliminating the need for larger fasteners that would exceed packaging constraints.
3Strength
If molded retention features are made robust to prevent breakage, then attachment strength improves, but profile height increases and low-profile design requirements are not met
Solution Approach 1:
The system separates the retention feature (molded in the appliqué) from the attachment mechanism (retainer with heat stakes). The molded retention feature can be simple and low-profile, while the retainer provides the necessary strength through heat stake attachment, eliminating the need for tall, robust molded features.
Solution Approach 2:
The retainer acts as an intermediary component between the appliqué and the mounting surface. It attaches to the appliqué via heat staking to retention features, providing a strong connection without requiring the appliqué itself to have tall or robust molded features, thus maintaining a low profile.
4Ease of manufacture
If conventional molded doghouse with push-on clip is used, then assembly is simple, but visible defects occur on the finished side and tooling condition is not robust
Solution Approach 1:
The patent replaces the push-on clip mechanism with a heat stake attachment system. The retainer is heat staked to the appliqué, creating a strong, clean attachment without the visible defects associated with push-on clips. This maintains assembly simplicity while eliminating cosmetic issues.
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 solution offers a robust and reliable attachment method that minimizes the risk of breakage, reduces visible defects, and meets the requirements of low-profile designs by providing high retention value and tolerance absorption, while maintaining ergonomic application requirements and allowing for flexible secondary fastener orientation.
Implementation Method 1
The attachment aperture is for heat staking to a low profile molded retention rib
Data Source
AI summary
A retainer for limited space attachment of a vehicle part with a class A surface to a vehicle. The retainer has a low profile portion and also an attachment base operable for being connected to heat stake ribs of the vehicle part. The attachment base includes at least one attachment aperture to provide attachment with the heat stake ribs. There is provided desired degrees of clip float and/or two-way limited clip float providing desired free movement of the clip when desired.