Ejection device for a movable furniture part
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ejection devices for movable furniture parts often have a large over-pressing path, which can lead to undesired triggering or unlocking, and lack efficient mechanisms for secure locking and controlled ejection.
Innovation Solution
The ejection device features a locking mechanism where the line of action of the ejection force storage member runs through the rotary axis, creating a 'dead center' locking position, and is unlocked by over-pressing the movable furniture part, allowing the ejection element to rotate and eject the furniture part via a tensioning element, with adjusted frictions and inertias preventing unintended unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional locking mechanisms are used with a larger over-pressing path, then the locking is more stable, but the risk of undesired triggering or unlocking increases
Solution Approach 1:
The locking mechanism utilizes dynamic positioning where the line of action of the ejection force storage member intersects with the rotary axis only at specific locking positions. This creates a labile equilibrium that is stable only when properly engaged, and easily disruptable by intentional over-pressing to unlock
Solution Approach 2:
The mechanism changes the geometric parameter of the line of action relative to the rotary axis. In the locked state, the line of action intersects the rotary axis creating stability. During unlocking, the line of action is shifted away from the rotary axis by over-pressing, creating instability and enabling rotation
2Ease of operation
If the over-pressing path is reduced to minimize gap size, then the furniture part can be operated more precisely, but the locking mechanism becomes more sensitive to unintended unlocking
Solution Approach 1:
The locking position is designed as a dynamic equilibrium point where the line of action of the ejection force storage member passes through the rotary axis. This creates a self-centering effect that maintains precise positioning while requiring intentional force to disrupt the equilibrium for unlocking
Solution Approach 2:
The triggering device acts as an intermediary element that mediates between the user's pressing action and the ejection element. It ensures that only sufficient over-pressing force can rotate the ejection element by transferring and amplifying the user's input force
3Force
If the ejection force storage member is positioned to create a dead center locking, then minimal forces are needed for ejection, but the mechanism requires precise positioning to prevent unintended unlocking
Solution Approach 1:
The dead center locking position is created dynamically where the line of action of the ejection force storage member intersects the rotary axis. This positioning maximizes the mechanical advantage, allowing minimal ejection force to rotate the element once unlocked
Solution Approach 2:
The triggering device serves as a precision intermediary that ensures accurate positioning of the ejection element relative to the line of action. It guides the ejection element into the correct angular position where the force application is optimal
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 minimizes the over-pressing path, ensures secure locking, and allows for controlled ejection with minimal forces, preventing undesired triggering and enhancing user experience by allowing precise operation of the ejection mechanism.
Implementation Method 1
an ejection force storage member force-actuating the ejection element
Implementation Method 2
undesired triggering or unlocking of this locking device by concussions is prevented by correspondingly adjusted frictions and inertias between the involved components
Implementation Method 3
undesired triggering or unlocking of this locking device by concussions is prevented by correspondingly adjusted frictions and inertias between the involved components
Data Source
AI summary
An ejection device for a movable furniture part includes an ejection element that can rotate about a rotational axis and ejects the movable furniture part from a closed position into an open position, an ejection force storage element which applies a force to the ejection element, and a locking device for locking the ejection element in a locking position. The line of application of the ejection force storage element runs through the axis of rotation when in the locking position.