Magnetic Door Arresting Device with Tilting Cover Plate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic door stoppers face issues with weak magnetic attraction force, susceptibility to corrosion, and unsightly design, which limits their effectiveness and application in heavily frequented spaces.
Innovation Solution
A counter-sunk magnetic arresting device utilizing a tilting element with a cover plate and a counter element, where at least one magnet element is a permanent or electromagnet, and the other is soft-magnetic, allowing for adjustable magnetic attraction force and improved mechanical loading and corrosion resistance, with a design that is flush with the surface to prevent tripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a permanent magnet is used to stop a door, then the door can be stopped, but the magnetic attraction force is too weak to secure the door
Solution Approach 1:
The patent changes the parameters of the magnetic system by using two separate magnet elements (first and second magnet elements) that can be independently adjusted. This allows optimization of the magnetic attraction force to achieve both door stopping and securing functions, resolving the contradiction between force strength and reliability.
Solution Approach 2:
The patent employs a composite structure combining two different magnet elements - one can be a permanent magnet and the other an electromagnet, or both can be permanent magnets with different properties. This composite magnetic system enables both weak attraction for stopping and strong attraction for securing the door.
2Force
If a moving ferromagnetic platelet is used in the floor component, then the door can be stopped, but the material is susceptible to corrosion and has poor visual appearance
Solution Approach 1:
The patent introduces a non-magnetic intermediary element (non-magnetic platelet or cover plate) that protects the ferromagnetic material from corrosion while allowing magnetic fields to pass through. This intermediary layer eliminates direct exposure of the corrosive-prone ferromagnetic material to the environment, resolving the corrosion issue while maintaining magnetic functionality.
Solution Approach 2:
The patent uses thin non-magnetic protective plates or cover plates that overlay the ferromagnetic components. These thin film structures provide corrosion protection and improved visual appearance while being transparent to magnetic fields, thus maintaining the door stopping function without exposing the vulnerable ferromagnetic material.
3Force
If a protruding door stopper is used, then the door can be stopped, but it creates tripping hazards in heavily frequented spaces
Solution Approach 1:
The patent embeds the magnetic components within the floor structure itself, nesting the first magnet element and non-magnetic platelet inside a recess in the floor. This nested configuration allows the door stopper to be flush with or recessed below the floor surface, eliminating protruding elements that could cause tripping while maintaining the magnetic door stopping function.
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 device provides a secure and reliable door stopping mechanism with enhanced mechanical strength and corrosion resistance, suitable for various applications including fire safety doors, without the risk of tripping hazards, and can be easily installed in multiple positions.
Implementation Method 1
at least one of these magnetic elements is a permanent magnet or electromagnet, while the other magnet element may be soft-magnetic or magnetizable
Data Source
AI summary
A device for securing or stopping a door relative to a stationary structure by means of magnetic attraction. In a secured position, a tilt element engages a counter-element due to magnetic attraction between the first magnetic element and the second magnetic element, and the door is stopped and optionally fixed in place, while in a retracted position the tilt element is retracted and the door can be moved. The tilt element includes a cover plate made of non-magnetic solid material and can be installed both on the stationary structure, such as the floor, wall or ceiling, or in the door.