Spectacle Frame Double Hinge with Perpendicular Pins
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Solution Overview
Problem
Conventional spectacle frames face challenges with fragility to shocks, limited angular motion of temples, and instability when worn, due to complex and weight-increasing mechanisms for achieving double-degree-of-freedom motion.
Innovation Solution
A spectacle frame design featuring hollow attachment members with cylindrical sheaths and hinging members with perpendicular hinge pins, utilizing springs and sliding rings for resilient double hinges, allowing temples to move in both horizontal and transverse planes with enhanced stability through specific surface contacts and recesses/protrusions, eliminating the need for cam or ball systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex mechanisms (cam or ball systems) are implemented to achieve double-degree-of-freedom temple motion, then angular motion capability is improved, but device complexity and weight increase
Solution Approach 1:
The hinge mechanism is segmented into two independent single-degree-of-freedom hinges, each responsible for one plane of motion. The first hinge enables horizontal angular motion while the second hinge enables transverse angular motion. This segmentation avoids the need for complex cam or ball systems, reducing overall device complexity while maintaining double angular motion capability.
Solution Approach 2:
Two separate single-degree-of-freedom hinges are merged into a unified double-hinge assembly where the output of the first hinge serves as the input for the second hinge. This merging achieves compound angular motion (horizontal + transverse) through a compact integrated structure, eliminating the need for oversized single mechanisms and reducing overall device bulk.
2Ease of operation
If resilient materials and hinging are used to increase temple displacement beyond stable opening position, then wearer comfort is improved, but mechanical stability may be reduced
Solution Approach 1:
The hinge mechanism incorporates resilient characteristics that allow dynamic displacement beyond the stable opening position. The resilient nature enables the temples to flex and return to their stable position, improving wearer comfort while maintaining mechanical stability through controlled elasticity rather than rigid constraints.
Solution Approach 2:
The mechanical properties of the hinge are optimized by changing parameters such as material resilience and hinge geometry. This allows the hinge to provide sufficient flexibility for comfortable temple displacement while maintaining adequate mechanical stability to prevent excessive deformation or failure under normal wearing conditions.
3Adaptability or versatility
If hinge components are enlarged to increase angular motion range, then adaptability is improved, but frame weight and bulk increase
Solution Approach 1:
Instead of increasing the size of single-hinge components to achieve greater angular motion range, the solution adds a second dimension of motion through a series-connection double-hinge system. The first hinge provides horizontal motion and the second hinge provides transverse motion, achieving expanded adaptability through dimensional composition rather than component enlargement, thus avoiding increased weight and bulk.
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
This design simplifies the implementation, increases angular motion, and optimizes temple stability, enhancing wearer comfort and mechanical resistance while reducing frame bulk, allowing greater adaptability and reduced deformation from shocks.
Implementation Method 1
each of the rods receiving a sliding ring or an equivalent member, submitted to the action of a spring bearing against the abutment
Data Source
AI summary
A spectacle frame includes a front face and temples connected thereto by hinges. Each hinge includes a hollow attachment member, respectively rigidly connected to the front face and to the temples, and each receives a hinging member having its free end provided with a hinge pin, such that the hinge pins are perpendicular to each other. The attachment members define a cylindrical sheath. The hinging members each include a rod, intended to be received in the respective sheath, one of the ends of the rod being provided with an abutment and the other end being provided with the hinge pin, each of the rods receiving a sliding ring submitted to the action of a spring bearing against the abutment, the ring being rigidly connected to the corresponding attachment member near its free end. The hinge pins of the hinging members are rigidly connected to each other by a connection member.