Eyeglasses Case Cam-Spring Closure for One-Hand Opening
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Solution Overview
Problem
Existing eyeglasses cases have limitations due to the hinge's rotation axis being outside the containing volume, restricting movement mechanisms and design options, and lack a secure, irreversible closing system that prevents accidental opening and lens damage.
Innovation Solution
A spring and cam system is integrated into the eyeglasses case, allowing the lid to be opened and closed with one hand, with the cam and spring mechanism ensuring secure closure and compact design without exposing moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hinge with external rotation axis is used, then the case can be opened and closed, but the rotation axis position limits movement mechanisms and design solutions
Solution Approach 1:
The patent removes the traditional external hinge rotation axis from the case structure. Instead, it uses a cam mechanism with a cam surface that guides the lid's movement path, extracting the rotational constraint and replacing it with a controlled sliding/rocking motion that provides greater design flexibility and movement options.
Solution Approach 2:
Rather than using a fixed external axis to define the rotation path, the invention inverts the approach by using a cam surface that actively guides and defines the movement trajectory. The lid follows the cam surface contour, reversing the traditional role of the hinge axis from a fixed constraint to a guided path.
2Reliability
If a spring system is added to automatically close the case, then accidental opening is prevented, but the structure becomes more complex
Solution Approach 1:
The patent combines the spring mechanism with the existing cam structure. The spring is integrated into the cam assembly, sharing the same space and structural elements. This merging allows the automatic closing function to be added without proportionally increasing overall structural complexity, as the spring works in conjunction with the cam surface already present in the design.
3Ease of operation
If moving parts are exposed for operation, then ease of use is improved, but the risk of accidental opening increases
Solution Approach 1:
The cam surface acts as an intermediary between the user's manual input and the lid's opening motion. By pressing on the cam surface at specific points, the user controls the lid's movement through the cam's guided path. This intermediary mechanism allows intentional opening while preventing accidental opening, as the cam geometry requires deliberate pressure application to overcome the spring force and initiate movement.
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 system provides a secure, compact, and easy-to-use eyeglasses case that maintains closure without external rotation axes, ensuring protection and ease of use while minimizing the risk of accidental opening.
Implementation Method 1
a spring element (13) designed to be mounted on the side (12) of the lid (10) and to cooperate with the cam (30) so as to push the lid (10) towards the closed position
Implementation Method 2
the arm (13c) of the spring element (13) being elastically deformable inwards
Implementation Method 3
a cam element (30) integrally joined with the side (22) of the container (20) so as to interact with the spring element (13) during opening of the lid (10)
Data Source
Figure 1~7
Figure 8~9
AI summary
Case for eyeglasses comprising a container (20) comprising a central body (21) and two opposite sides (22) integral with a respective end of the central body, a lid (10) movable so to open and close with respect to the container and comprising a central body (11) and two opposite sides (12) respectively integrally joined to one end of the central body, spring means (13) mounted on at least one of the said sides (12) of the lid (10) and designed to interact with the container (2); at least one side (22) of the container (20) has an opening (23) designed to house a cam (30).