Retractable Door Stopper with Magnetic Tilting Lever
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Solution Overview
Problem
Existing retractable door stoppers require precise fitting and a small vertical distance between the door and stopper, posing injury risks and limiting their application due to the need for a specially shaped engagement mechanism.
Innovation Solution
A retractable door stopper with a tilting element mounted rotatably about a rotational axis, activated by a trigger magnet, which tilts upward to engage the door without a weak counterpoint, allowing a larger gap and greater tolerance in positioning, featuring an elastic buffer element and a magnetizable stopper for stable blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the door stopper is raised only a little way upward (flat design), then the structure is simple, but the vertical distance between door and stopper must be small, requiring precise fitting and limiting application
Solution Approach 1:
The door stopper employs a dynamic tilting mechanism where the front lever can rotate from a retracted position to a blocking position. This dynamic transformation allows the stopper to adapt its height and engagement angle, eliminating the need for precise pre-fitting while maintaining structural simplicity. The lever tilts upward to meet the door at the optimal point, accommodating various door positions and gaps.
2Reliability
If the stopper engages on the door by a specially shaped counterpart, then engagement is achieved, but the engagement mechanism becomes potentially weak and complex
Solution Approach 1:
Instead of shaping the stopper to match the door, the invention inverts the approach: the door (or its trigger unit) is shaped with a magnetic trigger, and the stopper responds by tilting its front lever into engagement. This reversal simplifies the stopper's structure while maintaining reliable engagement through the magnetic trigger-lever mechanism.
Solution Approach 2:
The invention replaces complex mechanical engagement shapes with a magnetic field-based trigger system. The trigger magnet in the door interacts with the stopper magnet on the tilting element, using magnetic force to initiate the tilting action. This substitution eliminates the need for precisely shaped mechanical counterparts while ensuring reliable engagement.
3Reliability
If a small vertical distance is required between door and stopper, then the stopper can engage the door, but the field of application is limited and tolerances must be tight
Solution Approach 1:
The dynamic tilting lever allows the stopper to accommodate large vertical distances (up to 2 cm or more) between the door and the stopper's base. By rotating upward, the front lever can reach the door even when the door is positioned higher, greatly increasing application flexibility and tolerancing without compromising engagement reliability.
4Ease of operation
If the stopper is tilted up before the moving object is above the stopper, then the stopper can tilt far upward and engage by outer surface, but the trigger mechanism must activate in advance
Solution Approach 1:
The magnetic trigger mechanism activates the tilting action in advance, before the door reaches the stopper's final engagement position. As the door approaches with its trigger unit, the magnetic interaction causes the front lever to tilt upward preliminarily, positioning it for optimal engagement. This preliminary action simplifies the final engagement process and increases ease of operation.
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 enables a stable and reliable door stopper that can engage the door by its outer surface, accommodating larger gaps and tolerances, reducing injury risks and enhancing application flexibility while maintaining a simple design with minimal moving parts.
Implementation Method 1
the tilting element is rotatable out of the retracted position into the blocking position by the action of the trigger magnet on the stopper magnet or magnetizable element
Implementation Method 2
the tilting element comprises a front lever, on which a preferably elastic buffer element is disposed
Data Source
AI summary
A retractable stopper, for example a door stopper, includes a tilting element that is rotatably supported about a rotation axis and that can be moved from a retracted position into a blocking position by the action of at least one trigger magnet, which is fastened to a moving object, and in the blocking position blocks the movement of the moving object. The tilting element includes a front lever, on which a preferably elastic buffer element is disposed. In the blocking position, the buffer element faces the moving object. A stopper magnet is disposed at the tilting element. As the trigger magnet approaches a vicinity region in front of the stopper, the tilting element can be rotated out of the retracted position into the blocking position due to the action of the trigger magnet on the stopper magnet before the trigger magnet is located above the tilting element.