Slanted Abutment Faces for Precise Eyeglass Temple Adjustment
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Solution Overview
Problem
Conventional eyeglasses with angle-adjustable temples face difficulties in precise adjustment due to loose meshing of teeth, making it hard for wearers to apply minute adjustments effectively.
Innovation Solution
The design incorporates slanted first and second abutment faces with vertically spaced teeth on the temples and connectors, allowing for full meshing and resilient pivoting during adjustment, ensuring precise vertical adjustment even with outward force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional vertically spaced teeth are used for temple adjustment, then vertical adjustment is enabled, but the teeth cannot tightly mesh when outward force is applied, resulting in imprecise adjustment
Solution Approach 1:
The abutment faces are designed with slanted surfaces that curve toward each other, creating a wedge-shaped engagement area. This curvature ensures that when outward force is applied during adjustment, the teeth maintain tight meshing contact along the slanted surfaces, preventing loosening and enabling precise perceptible adjustment even under load
2Ease of operation
If outward force is applied to adjust temples, then adjustment action is initiated, but the teeth meshing loosens particularly at inner surfaces, making minute adjustments difficult
Solution Approach 1:
The slanted abutment faces are pre-configured to generate inward-directed reaction forces that counteract the outward adjustment force. As the wearer applies outward force to initiate adjustment, the slanted surfaces automatically generate opposing inward forces that maintain teeth engagement, preventing loosening and enabling precise control throughout the adjustment motion
Data Source
AI summary
Eyeglasses include a pair of temples, and a lens frame assembly. Each of the temples has a front end portion that is formed with a recess. Each temple includes a first positioning protrusion that is disposed in the recess and that defines a first abutment face formed with a plurality of first teeth. The lens frame assembly includes a pair of connectors extending rearwardly, and that are pivotally and respectively disposed in the recesses. Each connector has a rearward end defining a second abutment face that is formed with a plurality of second teeth that mesh selectively with the first teeth to thereby allow for vertical adjustment of the temples. Each of the first and second abutment faces has a first vertical edge and a second vertical edge, and is slanted such that the first vertical edge is more forwardly positioned than the second vertical edge.