Magnetic Child Safety Buckle With Spring-Reduced Resetting

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Solution Overview

Problem

Existing child safety buckles in carriers require multiple springs for resetting, increasing parts count, weight, and assembly costs.

Innovation Solution

A buckle design featuring a male and female buckle with magnets and an operation member, utilizing elastic members and magnetic attraction/repulsion for locking and unlocking, reducing the need for springs and simplifying structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple springs are used for resetting components in the buckle, then the resetting function is achieved, but the number of parts increases, weight increases, and assembly cost increases

Engineering Contradiction:

Improveresetting functionVSAvoidnumber of parts

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces traditional mechanical springs with a magnetic field-based resetting mechanism. Magnets are embedded in the buckle components to generate magnetic forces that automatically reset the locking mechanism after unlocking, eliminating the need for multiple mechanical springs and reducing part count while maintaining the resetting function

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and interaction mechanism by introducing magnetic field parameters. Instead of relying on mechanical elastic deformation of springs, the system uses magnetic field strength and polarity changes to achieve resetting, fundamentally altering the operational parameters of the buckle mechanism

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple springs are used for resetting components in the buckle, then the resetting function is achieved, but the weight of the buckle increases

Engineering Contradiction:

Improveresetting functionVSAvoidweight of buckle

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent replaces heavy mechanical springs with lightweight magnetic components. The magnetic field generation requires minimal material mass compared to mechanical springs, significantly reducing the overall weight of the buckle while preserving the automatic resetting capability through magnetic attraction and repulsion forces

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If multiple springs are used for resetting components in the buckle, then the resetting function is achieved, but the assembly cost increases

Engineering Contradiction:

Improveresetting functionVSAvoidassembly cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces complex mechanical spring assemblies with simpler magnetic component integration. Magnets can be embedded directly into molded plastic components during manufacturing, eliminating separate assembly steps for installing multiple springs and reducing labor costs and assembly complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent merges the resetting function into the existing buckle structure by integrating magnets within the housing and moving components. This consolidation eliminates the need for separate resetting mechanisms and reduces the total number of parts that require assembly, thereby lowering manufacturing costs

Inventive Principle:

Principle #5Merging (Combining)

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 achieves a lightweight, low-cost buckle with simplified assembly by using magnets and elastic members for secure fastening and release of straps, enhancing safety and ease of use.

Implementation Method 1

The magnetic elements are configured to attract or repel each other to enable automatic locking and unlocking of the buckle

Methodology Applied

Scientific EffectMagnetic attraction/repulsion: Magnetism

Implementation Method 2

the elastic member applies a force to the engaging portion in a direction towards the locked position

Methodology Applied

Scientific EffectElastic force: Elasticity

Data Source

PatentUS20250381930A1buckle

Publication Date: 2025.12.18 WONDERLAND SWITZERLAND AG

AI summary

The present disclosure provides a buckle, including a male buckle having an engaged portion; a female buckle including a housing, a cover, and a locking member, the housing and the cover enclosing an accommodation space, the locking member being movably disposed in the accommodation space, the locking member having an engaging portion, the engaging portion having a locked position in which it is locked with the engaged portion and an unlocked position in which it is unlocked from the engaged portion; and an operation member, which is movably disposed on the female buckle to selectively actuate the engaging portion to be unlocked from the engaged portion. The cover or the locking member is provided with an elastic member which applies a force to the engaging portion in a direction towards the locked position. The present disclosure provides a buckle with simple structure, light weight, and low assembly cost.