Detachable Eyeglass Hinge for Screwless, Tool-Free Assembly
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Solution Overview
Problem
Existing eyeglass hinges require screws for assembly and disassembly, which are small, easily lost, and prone to loosening, causing inconvenience and potential separation of the frame and temples.
Innovation Solution
A detachable hinge structure that is screw-free, allowing temples to be detachably connected to the frame via a pivot joint and combination bracket with a narrower aperture, enabling tool-free assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to assemble the frame and temples, then the connection is secure and reliable, but the assembly and disassembly require specific tools and are inconvenient
Solution Approach 1:
The patent extracts and eliminates the screw component from the assembly system. Instead of using screws to connect the temple to the frame, the design employs a pivot joint with a pivot hole that allows the temple to be inserted and secured without any fastening elements. This extraction of the screw component directly resolves the contradiction by making assembly tool-free while maintaining connection reliability through the pivot joint mechanism.
Solution Approach 2:
The pivot joint structure enables self-service assembly and disassembly. The temple can be easily inserted into the pivot hole from the front side and secured through the elastic deformation of the pivot joint, without requiring any external tools or additional fastening components. Users can perform assembly and disassembly operations themselves, eliminating the need for specialized screwdrivers or assembly tools.
2Stability of the object's composition
If screws are used to connect the frame and temples, then the structure is stable, but the screws are easily lost or loosened after long-term use
Solution Approach 1:
By completely removing the screw component from the design, the patent eliminates all problems associated with screws including loosening, loss, and accidental separation. The pivot joint with pivot hole provides a screw-free connection that maintains structural stability without the reliability issues inherent in screw-based assemblies.
Solution Approach 2:
The pivot joint structure employs a nested configuration where the pivot hole is formed within the temple structure and receives the pivot joint from the frame. This nested arrangement ensures that the connection components are integrated into the overall structure rather than being separate fastening elements, preventing loss and maintaining stable connection over time.
3Reliability
If a narrow aperture is used in the combination bracket, then the pivot joint is securely retained, but the assembly process becomes more difficult
Solution Approach 1:
Instead of making the aperture larger to facilitate assembly, the patent inverts the approach by designing the pivot joint with elastic deformation capabilities. The narrow aperture is maintained for secure retention, while the pivot joint's elasticity allows it to deform during insertion and then lock into place, making assembly easy despite the narrow opening.
Solution Approach 2:
The patent utilizes parameter changes in the material properties of the pivot joint, specifically its elasticity. The pivot joint can elastically deform to pass through the narrow aperture during assembly, then returns to its original shape to provide secure retention. This parameter change (elastic deformation) resolves the contradiction between narrow aperture retention and assembly ease.
Data Source
AI summary
Provided is a detachable hinge, including a frame and two temples. Each side of the frame is provided with a pivot base having a window. A pivot joint is provided between a top surface and a bottom surface of the window. A front end of each temple is provided with a combination bracket. The combination bracket is provided with a pivot hole having an aperture from top to bottom. The aperture has a width that is smaller than an outer diameter of the pivot joint. Each temple is detachably forced into the pivot joint from the inside of the frame by the aperture such that the pivot joint is embedded in the pivot hole and can pivot relative to the frame. This allows the operator to disassemble and assemble the frame or temples without the assistance of tools, thereby improving the convenience of structural disassembly and assembly.