Drawer Slide Rail Blocking Mechanism for Overpush Locking Safety
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Solution Overview
Problem
Existing drawer drive devices with touch-latch mechanisms fail to ensure safe closing when the drawer is pushed too hard or pushed to the end stop, as the ejection device cannot lock properly, leading to potential unsafe operation.
Innovation Solution
A pull-out guide with a blocking element that can be moved into a blocking position before the closed position is reached, preventing unlocking when the overpressure position is reached, and a time-delayed reset movement ensures the blocking element remains in the blocking position for a short period after the closed position is reached, preventing immediate unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drawer is pushed too hard or pushed to the end stop, then the drawer closes quickly, but the ejection device cannot lock properly and safe closing is not guaranteed
Solution Approach 1:
The blocking element is moved into the blocking position in advance during the closing movement, before the drawer reaches the closed position. This preliminary action prevents the ejection device from being triggered by over-pushing, ensuring reliable locking even when the drawer is pushed too hard or to the end stop.
Solution Approach 2:
The blocking element applies a counter-action by preventing the locking element from moving into the release position when the drawer is pushed too hard. This preliminary anti-action counteracts the harmful effect of over-pushing before it can cause unreliable locking.
2Reliability
If a blocking element is introduced to prevent unlocking when pushed through, then safety is improved, but the device complexity increases
Solution Approach 1:
The blocking element is integrated with the existing locking mechanism components. The blocking element works together with the locking element and restoring device that are already part of the touch-latch mechanism, merging the safety function into the existing structure rather than adding a completely separate system.
Solution Approach 2:
The blocking element serves multiple functions: it prevents unlocking when the drawer is pushed too hard, works with the restoring device to enable normal triggering, and integrates with the existing locking mechanism. This multi-functionality reduces the need for additional separate components.
3Reliability
If the blocking element prevents unlocking immediately when closed position is reached, then safety is improved, but the operation time increases due to time delay
Solution Approach 1:
The blocking element operates periodically rather than continuously. It blocks unlocking only during the brief moment when the drawer reaches the closed position and prevents over-pushing. After a short time delay, the blocking element returns to the release position, allowing normal operation. This periodic blocking minimizes time loss while maintaining safety.
Solution Approach 2:
The blocking element performs its safety function in advance during the closing movement, before the drawer fully reaches the closed position. By moving into the blocking position during the closing movement and returning after a short delay, it prevents over-pushing without causing significant operational delays.
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
This solution ensures safe closing by preventing accidental unlocking when the drawer is pushed too hard, allowing normal operation while maintaining safety by delaying the unlocking of the ejection device, thus preventing unintended opening.
Implementation Method 1
it is provided that the reset movement of the reset device takes place with a time delay. This means that a certain time after the closed position has been reached, it is not possible to unlock the ejection device
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
Drive device (1) for a movable furniture part (2), having a lockable ejection device (3) for ejecting the movable furniture part (2) from a closed position (SS) into an open position (OS), wherein the ejection device (3) can be unlocked by pressing over the movable furniture part (2) into a pressed-over position (ÜS) situated behind the closed position (SS) in the closing direction (SR), wherein a blocking element (4) is provided which has a blocking position (B) in which the blocking element (4) prevents the unlocking of the ejection device (3) on reaching the pressed-over position (ÜS), and which has a release position (F) in which the ejection device (3) can be unlocked on reaching the pressed-over position (ÜS).