Three-Point Eyeglass Lens Assembly for Tool-Free Replacement
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Solution Overview
Problem
Existing eyeglass lens assemblies require tools for assembly and disassembly, making the process inconvenient and time-consuming.
Innovation Solution
A three-point lens replacement assembly that securely connects the lens and bridge via a positioning recess, mounting slot, and connection hole without the need for tools, using a positioning protrusion, mounting block, and connection pin for firm attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threaded fasteners are used to fix lenses in assembly holes, then stable connection between lenses and frame is achieved, but tools are required for assembly and disassembly making the process inconvenient and time-consuming
Solution Approach 1:
The connection mechanism is segmented into multiple independent positioning points (first positioning recess, second positioning recess, third positioning recess) with corresponding positioning protrusions. This segmentation allows the lens to be secured at multiple discrete locations without requiring threaded fasteners, enabling tool-free assembly while maintaining stable connection.
Solution Approach 2:
Positioning protrusions and positioning recesses serve as intermediary elements between the lens and frame. These intermediaries enable direct mechanical engagement without requiring external threaded fasteners or tools, resolving the contradiction by providing both stable connection through precise positioning and ease of operation through simple insertive assembly.
2Reliability
If threaded fasteners are used to secure lenses, then reliable fixation is achieved, but assembly and disassembly require tools increasing loss of time
Solution Approach 1:
The positioning recesses and positioning protrusions are pre-formed during manufacturing, eliminating the need for threading operations or tool-based fastening. The lens is designed with connection holes and positioning features that align with corresponding features in the frame, allowing rapid tool-free assembly by simply inserting the lens into position, thereby significantly reducing assembly time while maintaining reliable fixation.
Solution Approach 2:
Instead of using threaded fasteners that require screwing and tightening actions, the invention inverts the approach by using recesses and protrusions that engage through simple insertion and positioning. This inverted mechanism eliminates the time-consuming threaded fastening process while achieving equivalent or superior fixation reliability through precise geometric engagement.
3Ease of operation
If simple insertion without positioning features is used, then assembly is faster and easier, but the lens may come off lacking stable connection
Solution Approach 1:
The lens and frame are equipped with localized positioning features (positioning recesses and positioning protrusions) at specific critical locations rather than requiring complex overall structures. The first positioning recess, second positioning recess, and third positioning recess are strategically positioned to provide localized engagement points that ensure stable connection while maintaining simple overall assembly geometry for ease of operation.
Solution Approach 2:
The connection system incorporates three-dimensional positioning features including positioning recesses at different locations and depths, and corresponding positioning protrusions that engage in multiple spatial dimensions. This multi-dimensional engagement provides stable connection preventing lens displacement while maintaining simple insertive assembly without requiring complex multi-step fastening procedures.
Data Source
AI summary
A three-point lens replacement assembly for eyeglasses is provided. An inner side of a lens is mounted into an insertion recess of a bridge. A connection hole which corresponds to a connection pin of the bridge is mounted on an upper edge of the lens while the inner side of the lens is provided with a positioning recess and a mounting slot respectively corresponding to and able to be connected with a positioning protrusion and a mounting block of the insertion recess. A temple pivot member for pivotally connected with a temple is fixed and connected with an outer side of the upper edge of the lens. Thereby the lens and the bridge are connected firmly in a three-point positioning manner. No tools are required and operation is easier and convenient during assembly and replacement of the lens. The assembly process is completed faster.