Folding-Sliding Door Ejector Locking for Stable Open Position
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Solution Overview
Problem
Folding doors or folding-sliding doors can unintentionally move to a closed position due to accidental contact with users, lacking a reliable mechanism to maintain an open position.
Innovation Solution
An ejector device with an ejector element that engages with a holding element to hold the door open and applies a force to move it to a closed position, featuring a locking device to prevent accidental release and an overload protection mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a folding door or folding-sliding door is equipped with a closing mechanism, then the door can be moved from an open position to a closed position, but the door may unintentionally move to a closed position due to accidental contact with a user
Solution Approach 1:
The ejector device is pre-positioned on the first door leaf and the holding element is pre-positioned on the second door leaf. When the door is opened, the ejector element automatically engages with the holding element to maintain the open position, performing the holding action in advance before any accidental closing can occur.
Solution Approach 2:
The ejector element acts as an intermediary between the door leaves and the holding element. It transfers and applies force to the holding element to maintain the open position, while the locking device serves as an intermediary mechanism to control the engagement and disengagement of the ejector element, preventing accidental release.
2Reliability
If a locking device is added to prevent accidental release of the ejector element, then the door position stability is improved, but the device complexity increases
Solution Approach 1:
The locking device is designed to automatically engage and disengage based on the door's position and user interaction. The control cam and control pin work together to automatically lock the ejector element in the engaged position when the door is open, and automatically release it when the door is closed or compressed, eliminating the need for manual locking operations.
Solution Approach 2:
The control cam changes its geometric parameters (position, shape) based on the door's angular position. As the door opens or closes, the control cam rotates and changes the engagement state of the control pin, thereby automatically transitioning the locking device between locked and unlocked states without additional complexity.
3Power
If the ejector element is designed to apply force to the holding element for closing, then the closing process is supported, but the risk of unintentional closure increases
Solution Approach 1:
The ejector element's engagement with the holding element is made dynamic through the control cam mechanism. The engagement is active and force-applying when the door is in the open position, but automatically disengages when the door approaches the closed position or is compressed, allowing the system to adapt its behavior based on the door's state.
Solution Approach 2:
The locking device performs a preliminary anti-action by preventing the ejector element from disengaging from the holding element under normal conditions. This counteracts the potential harmful effect of unintentional closure before it can occur, while still allowing intentional closing when the user compresses the door.
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 ensures the door remains securely open until intentionally closed, providing safety and stability against unintentional closure, while allowing controlled closure with stored energy.
Implementation Method 1
the ejector element is designed to apply a force to the holding element in order to move the second door leaf from the open position to the closed position
Implementation Method 2
the ejector element can be actuated by at least one force storage member that can be loaded manually by a user
Data Source
AI summary
An arrangement includes a folding door or folding-sliding door, which comprises at least two door leaves connected to one another in an articulated manner. An ejector device is arranged on a first of the two door leaves for at least partially transferring the folding door or folding-sliding door from a folded open position into a closed position. The at least two door leaves are arranged in a common closing plane, and a holding element is arranged on the second of the two door leaves. The ejector device has an ejector element which can be brought into engagement with the holding element in the open position to hold the folding door or folding-sliding door in the open position. The ejector element is configured to apply a force to the holding element to move the second door leaf from the open position into the closed position.