Rimless Eyeglass Lens Mounting With a Shared Threaded Bore
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Solution Overview
Problem
Rimless eyeglasses face challenges in mounting components to lenses, with protruding fasteners causing aesthetic issues and requiring custom cutting, which complicates the process and makes it time-consuming to achieve flush surfaces.
Innovation Solution
The use of a threaded fastener system where the mounting protrusion and lens together define a threaded bore, allowing for easy assembly with conventional tools and minimizing visual impact, as the threaded fastener secures the components by engaging both the protrusion and the lens at distinct circumferentially spaced and axially aligned portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional mounting methods are used to attach bridge and side arms to lenses, then components can be securely mounted, but protruding fasteners create aesthetic issues and require custom cutting which is time-consuming
Solution Approach 1:
The threaded bore is pre-formed in the lens at the correct depth and position before assembly. The mounting protrusion is pre-formed on the bridge or side arm. This preliminary preparation eliminates the need for custom cutting during assembly, as the components are designed to mate with pre-prepared features, thereby reducing assembly time while maintaining flush surface appearance
Solution Approach 2:
The invention changes the mounting approach from using adjustable fasteners of varying lengths to a fixed-depth threaded bore system. The threaded bore has a predetermined depth that corresponds to the length of the mounting protrusion, creating a standardized interface that eliminates the need for custom cutting while ensuring consistent flush mounting across different lens and component combinations
2Ease of manufacture
If conventional mounting methods are used, then components can be attached to lenses, but protruding fasteners create aesthetic issues
Solution Approach 1:
The mounting protrusion acts as an intermediary element that extends from the bridge or side arm into the threaded bore in the lens. This protrusion is precisely sized to match the threaded bore depth, allowing the fastener to be recessed flush with the lens surface while still providing secure mechanical attachment. The protrusion mediates between the component and lens, enabling a clean finished appearance without sacrificing mounting strength
3Adaptability or versatility
If custom-fitted fasteners are used for different lens shapes, then proper mounting can be achieved, but the process becomes complicated and time-consuming
Solution Approach 1:
The threaded bore and mounting protrusion create a universal mounting interface that can accommodate different lens shapes and sizes. Instead of requiring custom fasteners for each lens type, the standardized threaded interface allows the same mounting procedure to be used across various lens configurations. The protrusion and bore dimensions can be adjusted for different applications, but the fundamental mounting mechanism remains the same, simplifying the overall process while maintaining adaptability
Data Source
AI summary
An assembly (10) of a lens (16, 18) and a component (24, 26). The lens (12, 14) defines a mounting aperture (32) and the component (24, 26) defines amounting protrusion (36) inserted in the mounting aperture (32). The lens (16,18) and mounting protrusion (36) together define a threaded bore (34) receiving a threaded fastener (30) therein into. Part of the circumference of the threaded bore (34) is defined by the lens (16, 18) and part of the circumference of the threaded bore (34) is defined by the mounting protrusion (36).