Rimless Spectacle Frame Elongated Hole Fastening
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Solution Overview
Problem
Existing rimless spectacle frames face issues with screw connections coming loose, leading to potential twisting or loss of components, and require noticeable and disruptive mechanical anti-twist devices.
Innovation Solution
The use of elongated holes with parallel side walls in spectacle lenses and rectangular recesses in cheek pieces and nose bridges, combined with closure clips and pins made of titanium or stainless steel, creates a secure and stable fastening system without the need for screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If screw-and-nut connections are used to fasten rimless spectacle components, then the components can be assembled, but the connections can come loose unintentionally and components may twist or become lost
Solution Approach 1:
The patent replaces the traditional screw-and-nut mechanical fastening system with a permanent bonding system using adhesive and mechanical interlocking features (recesses and protrusions). This substitution eliminates the reliability issues of screw connections coming loose while maintaining assembly capability through controlled bonding processes.
Solution Approach 2:
The fastening system is segmented into separate functional elements: recesses in one component, protrusions in the mating component, and adhesive material. This segmentation allows each element to perform its specific function - the recesses and protrusions provide mechanical alignment and interlocking, while the adhesive provides permanent bonding, together achieving both assembly ease and connection stability.
2Reliability
If mechanical anti-twist devices are added to prevent component loosening, then connection stability improves, but the devices become noticeable and disruptive in the field of vision
Solution Approach 1:
The invention extracts the anti-loosening function from visible mechanical devices and integrates it into the bonding system itself. The adhesive bonding combined with recess-protrusion interlocking provides anti-loosening capability without requiring separate visible mechanical anti-twist devices, thereby eliminating visual obstruction while maintaining connection stability.
3Strength
If large screws and nuts with washers are used for fastening, then the connection strength increases, but the components become noticeable and disruptive in the field of vision
Solution Approach 1:
The patent uses thin adhesive films to create strong bonds between components. The adhesive layer, combined with the interlocking recess-protrusion design, provides sufficient connection strength without requiring large visible fasteners. This thin-film bonding approach maintains strength while eliminating visual obstruction in the field of vision.
4Ease of manufacture
If conventional screw connections are used, then assembly can be performed with simple tools, but additional recesses are required in the lenses which complicates the design
Solution Approach 1:
The invention merges the fastening function with the lens mounting structure by integrating recesses and protrusions directly into the lens and frame components. This consolidation eliminates the need for separate screw holes and fastener recesses, simplifying the overall design while maintaining ease of manufacture through standard bonding and assembly tools.
Data Source
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AI summary
A rimless spectacle frame is provided comprising spectacle lenses (1; 21; 22), lateral spectacle cheeks (3) and a central nose bridge (4) with common through-holes for mutual fastening elements, which cannot be disassembled accidentally, which is very light, small and stable in design so that it does not restrict the field of vision of a spectacle wearer, has a very high resistance to mechanical influences and can be assembled with the simplest tools without special tools, which is achieved by the through-holes in the spectacle lenses (1; 21;22) consist of elongated holes (2) with parallel side walls (5) and those of the cheek pieces (3) and the nose bridge (4) consist of rectangular recesses (8) and the fastening elements are formed by locking clips (6) inserted into the recesses (8) from one side and locking pins (7) inserted from the opposite side, all of which are made of titanium sheet, of sheet of a titanium alloy or of steel, each of which has a thickness which corresponds to the dimension of the distances between the side walls (5) of the elongated hole (2) and the width of the recesses (8);