Single Retainer Snap-Fit Mechanism for Fastener and Limiter Assembly
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Solution Overview
Problem
Existing fastener assemblies with multiple retainers are prone to material cost inefficiencies and labor-intensive assembly processes, and may experience undesirable shifting of fasteners due to insufficient press fit forces.
Innovation Solution
A single retainer design with fastener-engaging and limiter-engaging members, including inwardly-directed prongs and outwardly-extending rims, provides a snap-fit mechanism to securely retain both the fastener and limiting members, reducing material costs and assembly time while enhancing retention strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple retainers are used within a limiter sleeve, then the fastener can be captured at multiple locations, but material cost increases and assembly becomes more labor-intensive
Solution Approach 1:
The patent combines multiple retainer functions into a single retainer component. This single retainer includes a body with multiple arms that can each engage with fasteners independently, thereby capturing multiple fasteners within one limiter sleeve without requiring multiple separate retainer components. This merging approach reduces material cost and assembly complexity while maintaining the ability to secure fasteners at multiple locations.
Solution Approach 2:
The single retainer is designed with multi-functional capabilities through its modular arm structure. Each arm can independently engage with a fastener, allowing the single retainer to perform the function of multiple retainers. The retainer body can accommodate various configurations of arms to secure different numbers and types of fasteners, providing universal applicability across different fastening scenarios.
2Ease of manufacture
If a press fit mechanism is used to secure retainers to fasteners, then assembly is simplified, but the fastener may shift if the press fit force is insufficient
Solution Approach 1:
The retainer is segmented into multiple independent arms that can flex and adapt to the fastener geometry. Each arm can be press-fitted onto a fastener shaft, providing localized securing points. This segmentation allows the press fit mechanism to be applied at multiple discrete locations along the fastener, increasing overall retention reliability without requiring excessive force at any single point.
Solution Approach 2:
The retainer arms are designed with dynamic characteristics that allow them to flex during assembly and then lock into position on the fastener. This dynamic behavior enables the arms to accommodate minor variations in fastener dimensions during press fit assembly, then maintain a secure, fixed position that prevents fastener shifting during operation.
Data Source
AI summary
A single retainer is configured to securely retain a fastener and first and second limiting members. The retainer may include a main body, fastener-engaging members extending from the main body, and limiter-engaging members from the main body. The fastener-engaging members are configured to securely engage a portion of the fastener, and the limiter-engaging members are configured to securely engage portions of the first and second limiting members. The fastener-engaging members and the limiter-engaging members are configured to retain the fastener and the first and second limiting members.