Spectacle Hinge Tool-Free Assembly Anti-Removal Mechanism
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Solution Overview
Problem
Existing spectacle temple hinges face issues with material elasticity leading to unwanted deformation and potential loss of the temple piece, as not all materials provide the necessary elasticity, and existing solutions are complex and require tools for assembly.
Innovation Solution
A novel spectacle temple hinge design featuring projections and grooves around the hinge pin, allowing for tool-free assembly and disassembly, with angled mounting grooves preventing unintentional removal, and compatible materials for defined running properties, ensuring stability and reusability without mechanical deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the end of the temple piece is made elastic to enable assembly, then assembly is possible, but unwanted deformation of the hinge area occurs and the temple piece can be lost
Solution Approach 1:
The elastic deformation requirement is extracted from the temple piece material and transferred to the assembly process itself. The temple piece end remains rigid, and elasticity is provided by the interference fit mechanism during assembly, eliminating material elasticity requirements while maintaining assembly capability.
Solution Approach 2:
The solution changes the parameter of material elasticity from a requirement for the temple piece to a characteristic of the assembly process. By using interference fits with specific dimensional tolerances, the system achieves assembly without requiring the temple piece material to be elastic, thus preventing unwanted deformation.
2Adaptability or versatility
If the temple piece can be easily removed from the hinge joint, then temple pieces can be exchanged, but the temple piece can be unintentionally removed
Solution Approach 1:
The mounting grooves are designed with an asymmetric angle (less than 90°) relative to the longitudinal axis, creating a directional insertion path. This asymmetric geometry allows easy insertion in the correct direction while preventing accidental removal, as the temple piece would need to be pulled at a specific angle to disengage.
Solution Approach 2:
The angled mounting grooves create a preliminary geometric constraint that prevents removal before any force is applied. The geometry itself provides the anti-action by making removal paths impossible unless the temple piece is first inserted and locked in position, preventing unintentional loss.
3Device complexity
If the hinge joint uses simple components for easy assembly, then assembly is simple and tool-free, but the joint may be unstable
Solution Approach 1:
The hinge joint is segmented into distinct functional components (jaw part, temple piece, hinge pin, mounting grooves) that can be manufactured independently and assembled without tools. Each component has a specific function, and their combination creates a stable joint despite the simplicity of individual parts.
Solution Approach 2:
The hinge pin is nested within the mounting grooves of the temple piece and the recess of the jaw part, creating a compact hierarchical structure. This nesting arrangement provides stability through precise geometric interlocking while minimizing the number of separate components and assembly steps.
Data Source
Figure 1~2
Figure 3~5
Figure 6
AI summary
The eyeglass temple hinge has a spectacle frame fixed jaw element (1) which is provided with recess (2) for inserting temple fixed hinge portion (3) of a spectacle temple (7). The recess is provided with projections (8) which are arranged corresponding to end receptacles (9) of hinge pin (4) that is inserted into pin receptacle (10) of hinge portion. The front sides of end receptacles are engaged with mounting grooves (11) extending radially from pin receptacle to lateral surface of hinge portion.