Polymer-Filled Capped Nut Damage Resistance
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Solution Overview
Problem
Conventional capped nuts are prone to damage during shipping due to rough handling, leading to aesthetic issues and economic losses as entire batches are often rejected or scrapped.
Innovation Solution
A capped nut design featuring a polymer injected between the cap and the nut body, which increases damage resistance by providing additional support to the cap's top surface, allowing for reduced cap thickness and potentially lower manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cap is made thinner to reduce manufacturing costs, then production costs decrease, but damage resistance during shipping deteriorates
Solution Approach 1:
The patent combines the metal cap with a polymer material to create a composite structure. The polymer is injected into the cap cavity and bonds to both the cap interior and the nut body, creating a composite assembly where the polymer provides additional structural support and damage resistance, allowing the cap itself to be thinner while maintaining overall strength.
Solution Approach 2:
The cap structure is divided into two functional parts: the metal cap providing the basic structural framework and aesthetic appearance, and the polymer material providing enhanced structural support and damage resistance. This segmentation allows each material to be optimized for its specific function while working together as a unified structure.
2Quantity of substance
If the cap is made thinner to reduce material usage, then manufacturing costs decrease, but the cap becomes more susceptible to damage during rough handling
Solution Approach 1:
By combining the thin metal cap with the polymer material, the patent creates a composite structure where the polymer compensates for the reduced thickness of the cap. The polymer fills the cavity and bonds to provide the additional structural support needed to resist handling damage, allowing material reduction in the cap without sacrificing durability.
Solution Approach 2:
The polymer acts as an intermediary material between the thin cap and the nut body, providing structural support and protection. It mediates the mechanical stresses and impacts that would otherwise be borne entirely by the thin cap, distributing these forces throughout the composite structure.
3Reliability
If stainless steel is used for the cap to achieve corrosion resistance and aesthetic appeal, then durability and appearance improve, but manufacturing cost increases
Solution Approach 1:
The patent uses a composite structure where the metal cap (which can be made from various materials including stainless steel or alternative metals) provides the basic structural framework and aesthetic appearance, while the polymer material provides enhanced structural support. This allows for potential use of alternative, less expensive metals while maintaining both appearance and durability through the composite design.
Data Source
AI summary
Capped nuts are provided with an polymer in the top portion of the capped nut. The polymer may be disposed between the inner surface of the cap and a nut body. The polymer may extend into a top opening in the nut body and contact an inner wall of the opening in the nut body.