Magnetic Sliding Door Return Mechanism for Quiet, Smooth Closure

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Solution Overview

Problem

Conventional sliding door return devices are complex, prone to sticking and friction, and produce noise due to non-constant spring force, leading to partial closure or slamming issues.

Innovation Solution

A damping or return device featuring a diametrically differently-polarized magnet pin interacting with a steel plate or collar, combined with an elastically compressible element, which reduces friction and maintains constant force throughout the door's opening and closing motion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a conventional return device with L-shaped guide and pin is used, then the door leaf can be returned to open position, but the device becomes complex and prone to sticking and friction

Engineering Contradiction:

Improvedoor return functionVSAvoiddevice structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent extracts the problematic L-shaped guide and pin mechanism from the system, replacing it with a simplified magnetic interaction between the magnet in the door leaf and the steel plate in the frame. This removes the complex mechanical guidance elements that caused sticking and friction while preserving the door return function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical pin-and-guide system with a magnetic field-based interaction. The magnet and steel plate create magnetic attraction forces that guide the door leaf movement without physical contact, eliminating friction and sticking issues inherent in mechanical contact systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If a conventional return spring is used, then the door can be returned to open position, but the force is not constant causing slamming or incomplete closure

Engineering Contradiction:

Improvedoor closure qualityVSAvoidclosure consistency

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent changes the force characteristic from a variable spring force to a more constant magnetic attraction force. The magnetic force between the magnet and steel plate remains relatively constant throughout the door's movement range, providing consistent guidance force that prevents both slamming and incomplete closure.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If mechanical connection means are used for the return mechanism, then the door can be connected to the return mechanism, but noise is generated during operation

Engineering Contradiction:

Improvereturn mechanism connectionVSAvoidoperational noise

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent eliminates mechanical contact in the return mechanism by using magnetic field interaction between the magnet and steel plate. This contactless interaction completely removes the source of mechanical noise that would be generated by rubbing, impact, or vibration in traditional mechanical connections.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Ease of operation

If an L-shaped guide with pin is used, then guidance is provided, but friction and sticking occur preventing correct closing or opening

Engineering Contradiction:

Improvedoor movement guidanceVSAvoidmovement smoothness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent replaces the friction-prone mechanical L-shaped guide with a magnetic field-based guidance system. The magnetic attraction between the magnet and steel plate provides guidance forces without physical contact, eliminating friction and sticking that prevent smooth door movement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces the magnetic field as an intermediary between the door leaf and frame. This magnetic field mediates the interaction, providing guidance and return forces without direct mechanical contact, thus eliminating the friction and sticking problems of direct mechanical contact systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution provides a simple, low-cost, and noise-free mechanism for optimal guided opening and closing of sliding doors or drawers, preventing slamming and optimizing movement with controlled friction and play.

Implementation Method 1

a pin the shank of which is constituted by a diametrically differently-polarized magnet that slideably and axially interacts with a steel plate or a complementarily-shaped collar

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

combined with an elastically compressible element

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS10246923B2Damping or return device for sliding door leaves or for drawers

Publication Date: 2019.04.02 BORTOLUZZI SISTEMI SPA

AI summary

A damping or return device for sliding door leaves, particularly for furniture, or for drawers, which is constituted by a pin the shank of which is constituted by a diametrically differently-polarized magnet that slideably and axially interacts with a steel plate or a complementarily-shaped collar, which is made of steel and polygonal.