Ejection device for a movable furniture part
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Solution Overview
Problem
Existing ejection devices for movable furniture parts often have a large overpressure path, leading to undesirable triggering or unlocking due to vibrations, and lack efficient mechanisms for secure locking and easy unlocking.
Innovation Solution
An ejection device with a locking mechanism where the line of action of the ejection force accumulator runs through the axis of rotation, creating a 'dead center' locking position, and can be unlocked by overpressing the movable furniture part, causing the axis and line of action to separate, allowing the ejection element to rotate and eject the part via a clamping element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the line of action of the ejection force accumulator does not run through the axis of rotation, then the ejection element can rotate easily to eject the movable furniture part, but the locking position becomes unstable and susceptible to unwanted triggering by vibrations
Solution Approach 1:
The ejection force accumulator is pre-loaded during the closing movement to store sufficient energy. When the movable furniture part is in the closed position, the accumulator is already charged with force, so that upon triggering, the stored energy immediately drives the ejection element to rotate and eject the part without requiring additional force during the ejection act itself.
Solution Approach 2:
The design creates a dead center locking position where the line of action of the ejection force accumulator runs through the axis of rotation of the ejection element. This configuration creates a stable equilibrium state (like a pendulum at its lowest point) where small disturbances such as vibrations cannot cause spontaneous rotation, as the system is in a potential energy minimum.
2Force
If a large overpressure path is used, then the ejection element can overcome friction and inertia more easily, but the locking position becomes less stable and more prone to unwanted triggering
Solution Approach 1:
The ejection force accumulator accumulates the necessary force during the closing movement, so that the full ejection force is available immediately when needed, rather than requiring a large overpressure path to build up force gradually.
Solution Approach 2:
By creating a dead center locking position, the system achieves stable locking with minimal overpressure path. The stable equilibrium ensures that small forces from vibrations cannot overcome the locking, while the pre-loaded accumulator ensures sufficient force is available for intentional ejection.
3Productivity
If the line of action and axis of rotation are separated, then the ejection element rotates to eject the part, but additional force and movement are required that could cause unwanted triggering
Solution Approach 1:
The triggering action (pressing the movable furniture part into the overpressing position) is performed in advance to separate the line of action from the axis of rotation and initiate rotation. The ejection force accumulator is also pre-loaded during closing, so that once triggered, the ejection occurs rapidly using stored energy rather than requiring continuous force application.
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 design provides secure locking with minimal force or movement required for unlocking, preventing unwanted triggering and ensuring reliable operation by using friction and inertia to stabilize the locking position.
Implementation Method 1
an ejection force accumulator (5) which acts on the ejection element (4)
Implementation Method 2
Undesirable triggering or unlocking of this locking device due to vibrations is achieved by appropriately adjusted friction and inertia between the components involved
Implementation Method 3
Undesirable triggering or unlocking of this locking device due to vibrations is achieved by appropriately adjusted friction and inertia between the components involved
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to an ejection device (1) for a movable furniture part (2), comprising an ejection element (4) that can rotate about a rotational axis (X) and ejects the movable furniture part (2) from a closed position (SS) into an open position (OS), an ejection force storage element (5) which applies a force to the ejection element (4), and a locking device (17) for locking the ejection element (4) in a locking position (VS), the line of application (W) of the ejection force storage element (5) running through the axis of rotation (X) when in said locking position (VS).