Spectacle Side with Segmented Rings for Elastomer Adhesion
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Solution Overview
Problem
The challenge in producing filiform elements, such as spectacle arms, lies in the non-adherence of flexible elastomers to metal cores and the difficulty in centering the metal core during molding, where the elastomer is in a soft state, and existing solutions like plastic sheaths restrict flexibility.
Innovation Solution
A flexible metal core is coated with a flexible elastomer using a structure of rigid plastic rings as intermediate mechanical coupling points, which also aids in centering during injection molding, with conical mounts on the rings allowing for smooth elastomer injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic sheath is threaded over the metal arm to improve adhesion, then adhesion is improved, but flexibility deteriorates due to the rigidity of the sheath
Solution Approach 1:
The patent divides the continuous plastic sheath into multiple separate rigid plastic rings spaced along the metal core. Each ring provides localized adhesion points for the elastomer while the gaps between rings preserve the flexibility of the metal core, resolving the contradiction between adhesion and flexibility
Solution Approach 2:
The patent introduces rigid plastic rings as intermediary elements between the metal core and the elastomer coating. These rings serve as mechanical coupling points that facilitate elastomer adhesion without requiring a continuous rigid sheath, thus maintaining flexibility while improving adhesion
2Manufacturing precision
If the metal core is centered during molding with the elastomer in soft state, then centering is achieved, but the process becomes complex
Solution Approach 1:
The patent applies preliminary action by pre-attaching rigid plastic rings to the metal core before elastomer injection. These rings serve as pre-positioned centering elements that automatically guide and center the soft elastomer during injection, achieving precise centering without complex molding processes
Solution Approach 2:
The rigid plastic rings act as intermediary centering elements between the metal core and the soft elastomer during molding. They provide a structural framework that automatically centers the elastomer in the mold cavity, simplifying the molding process while ensuring precise centering
Data Source
AI summary
A linear element, especially a spectacle side, of the type comprising a flexible metal core coated with a flexible elastomer for comfort and/or appearance. Its structure is composed of a plurality of rigid plastic rings placed in fixed positions around predetermined areas of the flexible metal core so that each can serve as a point of intermediate mechanical attachment of the flexible elastomer with respect to the core. The cross section of the rings are inscribed within that of the elastomer surrounding it.