Screwless Eyeglass Frame Hinge for Stable Temple Positioning
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Solution Overview
Problem
Existing eyeglass frames with screw-based hinges face issues such as loosening, potential loss of screws, and deformation of temples when opened beyond normal positions, lacking a secure and durable connection mechanism.
Innovation Solution
A hinge design utilizing a tenon and slot mechanism without screws, where the tenon is housed in a gap between two strips and rotates within a slot, with bearing surfaces and a recess to maintain the temple's position securely in open and closed states, utilizing elastic properties for clamping forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a screw-based hinge is used, then the temple can be detached and reattached, but the screw may loosen or be lost, causing the frame to become unusable
Solution Approach 1:
The invention removes the screw element from the hinge system entirely. Instead of using a screw that can loosen or be lost, the patent employs a tenon-and-slot mechanism where the tenon fits into the slot and is retained by the elastic deformation of the temple arm itself, eliminating the need for separate fastening components.
Solution Approach 2:
The temple arm itself serves the dual function of both the moving component and the retaining mechanism. The elastic deformation of the temple arm creates the clamping force that secures the tenon in place, meaning the structure uses its own material properties to provide the fastening function without requiring external fasteners.
2Adaptability or versatility
If the temple is opened beyond normal position, then the hinge allows rotation, but the temple deforms
Solution Approach 1:
The invention incorporates a recess in the tenon that is positioned to engage with the temple arm when the temple is rotated beyond its normal closed position. This recess acts as a stop or cushion that prevents excessive rotation and由此 prevents deformation of the temple arm, while still allowing the necessary range of motion for normal use.
3Reliability
If a screw-based hinge is used, then the connection can be made, but additional parts are required increasing complexity
Solution Approach 1:
The invention merges the functions of multiple components into a single integrated tenon structure. The tenon combines the features of a connection element, a retaining mechanism, and a stop for excessive rotation, eliminating the need for separate screws, washers, and stoppers that would traditionally be required.
Solution Approach 2:
The tenon serves multiple functions simultaneously: it provides the axis of rotation for the temple, acts as the connection element between the temple and frame, provides the retaining mechanism through its fit in the slot, and provides the stop for excessive rotation through its recess. This multi-functionality reduces the overall number of parts required.
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 design provides a secure, screw-less hinge that prevents temple deformation and ensures stable positioning without the need for additional parts, facilitating easy assembly and disassembly while maintaining structural integrity.
Implementation Method 1
utilizing elastic properties for clamping forces
Data Source
Figure 1~2
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AI summary
The invention relates to a spectacle frame (100) comprising a front (102), two temples (106) having a first part (114) and a second part (116) folded upon itself, wherein the second part (116) has an upper band (202a) and a lower band (202b), each having a first end on one side of an extremum (118) and fixed to the first part (114) and a second end free on the other side of the extremum (118), wherein the two bands (202a) are separated by a gap and connected by a bar at their second ends, and for each temple (106), a tenon (120) fixed to the front (102) and carrying a hook (122) through which passes a slot (124) where the tenon (120) fits into the gap (206) and where the bar (204) is housed in the slot (124).