Eyeglass Temple Fixation with Magnetic Locking Against Separation

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Solution Overview

Problem

Existing eyeglass temple fixation systems using magnets are prone to accidental separation, leading to potential rim damage and economic loss, and may fail to prevent separation in certain scenarios like removing a helmet or sweater.

Innovation Solution

A system with three fixing points: a first magnet, a mechanical retention assembly with a compression spring and sphere, and a centering element, all connected to fixed blades, ensuring secure attachment of temples to rims.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a magnetic fixation system is used to attach temples to rims, then the attachment is simple and interchangeable, but the temples may accidentally separate from the rims

Engineering Contradiction:

Improveease of temple attachmentVSAvoidsecurity of temple attachment

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The fixation system is divided into three independent fixing points: a first magnet for initial attraction, a mechanical retention assembly with sphere and compression spring for secure locking, and a centering element with second magnet for additional magnetic retention. This segmentation distributes the fixation function across multiple components, preventing accidental separation while maintaining ease of operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The compression spring in the mechanical retention assembly is pre-compressed to store elastic potential energy, creating a pre-loaded retention force that cushions against separation attempts. This beforehand cushioning ensures the temple remains securely attached during normal use and extreme conditions.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Adaptability or versatility

If a magnetic fixation system is used, then temple interchangeability is enabled, but rim damage may occur upon accidental separation

Engineering Contradiction:

Improvetemple interchangeabilityVSAvoidrim damage risk

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The fixation force is distributed across three localized fixing points (first magnet, mechanical retention assembly, centering element with second magnet) rather than concentrated at a single point. This local quality distribution reduces stress concentration on the rim, preventing damage even when separation is attempted, while maintaining temple interchangeability.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If existing magnetic fixation systems are used, then temples can be easily attached, but they fail to prevent separation in extreme conditions like removing helmets or sweaters

Engineering Contradiction:

Improveease of temple attachmentVSAvoidresistance to separation in extreme conditions

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The fixation system uses three separate fixing mechanisms working together: magnetic attraction (first magnet), mechanical locking (sphere in cavity with compression spring), and additional magnetic retention (second magnet in centering element). This segmentation ensures that no single failure mode can cause separation, providing reliability in extreme conditions while maintaining ease of attachment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fixation system combines different physical principles and material properties: magnetic fields (magnets), elastic deformation (compression spring), and mechanical interlocking (sphere and cavity). This composite approach creates a fixation system that is both easy to operate and highly reliable under extreme conditions.

Inventive Principle:

Principle #40Composite materials

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

Prevents accidental separation of temples from rims, maintaining secure attachment during normal use and extreme conditions, reducing the risk of rim damage and repair costs.

Implementation Method 1

Magnets within the recesses and magnets of the temple ends have polar orientations that establish magnetic attraction with each other and join the temples to the front through the temple holders

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

a compression spring that is housed inside and a sphere located next to the compression spring

Methodology Applied

Scientific EffectElastic force: Elasticity

Data Source

PatentEP4664191A1System for fixing eyeglasses temples to the rims

Publication Date: 2025.12.17 EDIT YOUR LIFE SL

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AI summary

It comprises rims (1) to which two fixed blades (2) are fixed, one at each end, by means of screws (3), defining a first through hole (4), characterized in that it comprises: two movable blades (5), one per fixed blade (2), comprising a second through hole (6), a main body (7) with a first magnet (8) inside, a first cavity (9) and a second cavity (10), the first through hole (4) and the second through hole (6) being joined by a pin (16) that is located in a passage defined by both through holes (4, 6), and two temples (11), one for each fixed blade (2), comprising at one of its ends a mechanical retention assembly (12), comprising a hollow casing (20), a compression spring (21) that is housed inside and a sphere (22) located next to the compression spring (21) and partially outside the casing (20), said sphere facing the first magnet (8), a centering element (13) with a second magnet inside (14) attracted by the first magnet (8), which fits into the first cavity (9) and a blocking element (15) in a direction parallel to the temple (11) which fits into the second cavity (10).