Screwless Eyeglass Frame Mortise Tenon Plastic Hinge
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Solution Overview
Problem
Conventional screwless eyeglass frames rely on metal for resilience, which is heavy and costly, and pose challenges in recycling due to the need to dismount individual metal and plastic components.
Innovation Solution
A screwless eyeglass frame design utilizing a mortise and tenon joint with a C-shaped pivoting clip and shaft rod, allowing the temple support to rotate relative to the rim support without screws, enabling the frame to be made entirely from plastic for lighter weight and easier recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If metal material is used to provide resilience for screwless folding, then the folding function is achieved, but the weight and cost increase
Solution Approach 1:
The patent changes the material parameter from metal to plastic, and modifies the structural parameter by designing a resilient arm with a bent portion that has a radius of curvature between 0.5-2mm. This structural modification enables the plastic material to provide the necessary resilience for screwless folding while maintaining lightweight properties
Solution Approach 2:
The patent replaces expensive metal components with cheaper plastic materials. The resilient arm and temple piece are both made from plastic, eliminating the need for metal springs or hinges, thereby reducing both cost and weight while maintaining the folding function
2Ease of operation
If metal and plastic components are used separately, then the folding function is achieved, but the recycling process becomes complex requiring individual dismounting
Solution Approach 1:
The patent merges the resilient arm and temple piece into a single integrated structure made entirely of plastic. The resilient arm is formed as one piece with the temple piece, eliminating the need for separate metal and plastic components. This integration simplifies the recycling process as the entire frame can be processed together without disassembly
Solution Approach 2:
The patent uses homogeneous plastic material for both the resilient arm and temple piece, replacing the heterogeneous combination of metal and plastic. This material homogeneity enables simplified recycling since only one material type needs to be processed, eliminating the need for separation and individual dismounting of different materials
3Reliability
If conventional screw connection is used, then the temple can be firmly linked to the rim, but the folding operation becomes less convenient
Solution Approach 1:
The patent implements a self-service mechanism where the resilient arm automatically provides both the folding action and the locking function. When the temple piece is folded, the resilient arm deflects and naturally locks into position against the rim, eliminating the need for separate screws or complex locking mechanisms. The system serves itself by using the elastic deformation of the resilient arm to achieve both movement and secure positioning
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 design achieves screwless folding with reduced material costs and weight, facilitating efficient recycling by eliminating the need for metal components and leveraging plastic materials for a more economical and environmentally friendly product.
Implementation Method 1
The pivoting clip comprises a C-shaped buckle having appropriate resilience
Data Source
AI summary
A screwless eyeglass frame, including a rim support, a temple support and a pivoting clip. The rim support includes a first end face and an engagement slot recessed inwardly from the first end face. The temple support includes a second end face, two extending walls extended outwardly from two corresponding sides of the second end face, respectively, and a shaft rod provided between the two extending walls. The pivoting clip includes a C-shaped buckle with resilience, two connecting legs connected with two ends of the C-shaped buckle, respectively, and an opening located between the two connecting legs. In this case, the C-shaped buckle is allowed for pivotally connecting to the shaft rod. The two connecting legs are tenoned into the engagement slot, and the temple support is capable of rotating with respect to the rim support around the shaft rod and the C-shaped buckle.