Spectacle Frame Thread Tensioning Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spectacle frames require complex thread systems with varying lengths and intricate designs, leading to increased production costs, assembly difficulties, and the need for specialized tools for lens interchangeability.
Innovation Solution
A simple thread with adjustable length, integrated into a spectacle frame with a tensioning device that allows for easy insertion and clamping of spectacle lenses without prestressing, using a circular nylon thread that can be cut to size and operated manually, featuring a thread deflection mechanism for elastic holding forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional thread systems with V-shaped cross-section and clamping beads are used, then lens sizes can be varied, but multiple thread lengths must be kept in stock and assembly/disassembly requires increased attention and craftsmanship
Solution Approach 1:
The patent uses a single universal thread design with circular cross-section that can accommodate different lens sizes through adjustable tensioning, eliminating the need for multiple specialized thread types. The thread serves multiple functions: holding the lens, allowing adjustment, and enabling easy removal, all with one standardized component.
Solution Approach 2:
The patent changes the thread parameters from fixed (V-shaped cross-section, specific lengths) to variable (circular cross-section, adjustable tension). By making the tensioning force adjustable rather than fixed, the same thread can adapt to different lens sizes and frame configurations without requiring different thread specifications.
2Reliability
If mechanical thread tension anchors and locking clips are used, then thread tension can be maintained, but the device becomes complex and requires specialized tools for operation
Solution Approach 1:
The patent extracts the complex mechanical components (tension anchors, locking clips, levers) and replaces them with a simple friction-based tensioning system. The thread is tensioned by wrapping it around the lens holder and securing with a simple knot or friction hold, eliminating the need for specialized mechanical fastening devices.
Solution Approach 2:
The thread tensioning system is designed to be self-adjusting through friction and geometry. Once the thread is wrapped and knotted, it maintains its own tension without requiring active locking mechanisms. The user can adjust tension by simply pulling or repositioning the thread ends, and the system self-regulates through the friction between the thread and lens holder surface.
3Ease of manufacture
If threads with predetermined lengths and knots are used, then assembly is simplified, but the threads cannot be tightened and require replacement for different lens sizes
Solution Approach 1:
The patent transitions from static, fixed-length threads to a dynamic tensioning system. The thread length and tension can be adjusted during assembly and use. The thread can be wrapped multiple times around the lens holder, and the tension can be modified by pulling or repositioning, allowing the same thread to adapt to different lens sizes and frame configurations.
4Reliability
If multi-part mechanical tensioning devices are used, then secure lens holding is achieved, but the device complexity increases and tool requirements increase
Solution Approach 1:
The patent merges multiple separate components (thread, tensioning mechanism, locking device) into a single integrated system. The thread itself serves as both the holding element and the tensioning mechanism through its wrapping geometry and friction characteristics. This eliminates the need for separate mechanical tensioning devices while maintaining secure lens holding.
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 solution provides a technically simple, easy-to-handle lens holder that eliminates the need for multiple thread lengths and tools, enabling straightforward assembly and disassembly of spectacle lenses while ensuring secure and durable attachment.
Implementation Method 1
a thread that generates holding forces and has high tensile strength and low extensibility
Implementation Method 2
a tensioning device for the thread is provided... generating elastic holding forces
Data Source
AI summary
A novel spectacle frame for two spectacle lenses is provided, consisting of a lens holder for each of the two spectacle lenses, with a holding force-generating thread (2) of high tensile strength and low elongation, the ends of which are fixed to the frame or to a spectacle lens, which is technically very simple in construction and furthermore easy to handle, which is achieved by the fact that the thread (2) has a length dimension which is greater than the actual length between its end attachment and the wrapping path around a spectacle lens and that a tensioning device (3) for the thread (2) is provided on the spectacle frame (1), wherein a simple thread (2) is used which can be cut to length from a roll according to the required length.