Flexible Lever Ejection Mechanism for Wear-Free Drawer Decoupling
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Solution Overview
Problem
Existing ejection devices in the furniture and household appliance sector face challenges in maintaining a long service life and avoiding wear and tear, especially when subjected to numerous incorrect operations, which can lead to damage.
Innovation Solution
An ejection device featuring a flexible lever that decouples from the driver when a tensile force is exceeded, with a lever design allowing for significant deflection without material stress, made of plastic with an integral plug for easy assembly, and a U-shaped receptacle with a V-shaped bevel for secure coupling and decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid activator is used to ensure strong coupling with the driver, then coupling strength is improved, but wear and material stress increase after numerous operations
Solution Approach 1:
The activator changes its physical state from rigid to flexible, allowing controlled elastic deformation during operation. This parameter change enables the activator to absorb tensile forces through elastic deflection rather than rigid stress transmission, maintaining coupling strength while reducing wear and material stress after numerous operations.
2Reliability
If the activator is designed to be decouplable under tensile force, then reliability is improved, but coupling strength may be compromised
Solution Approach 1:
The activator transitions from a static rigid connection to a dynamic flexible connection that can adapt its stiffness characteristics. The flexible lever provides rigid-like behavior during normal coupling operations but automatically becomes compliant when tensile forces exceed the elastic limit, enabling automatic decoupling that protects the driver while maintaining reliable operation throughout the service life.
3Reliability
If a long flexible lever is used to reduce stress, then reliability is improved, but device complexity increases
Solution Approach 1:
The activator utilizes a flexible lever that can be implemented as a thin-walled plastic component with integrated elasticity. This approach achieves the stress-reducing benefits of a long lever while maintaining compact dimensions and simple integration into the existing driver structure, avoiding increased device complexity.
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 flexible lever design ensures reduced wear and stress, allowing for reliable decoupling and recoupling, thereby extending the service life and preventing damage from repeated operations.
Implementation Method 1
the activator comprises a flexible lever which, in the closed position, can be decoupled from the driver when a tensile force on a running rail is exceeded. As a result, the flexibility of the lever on the activator can be used to avoid wear or increased material stress, because the tensile force for decoupling the lever from the activator and the associated deflection can also be designed for the entire service life of the ejection device.
Data Source
AI summary
The invention relates to an ejection device comprising a runner (1), in particular for drawers, having an activator (10) fixed on a guide rail (3) of the runner (1), by means of which a carrier (6) can be moved along a guide (7) in a guide housing (8) and can be fastened in a closed position, wherein the carrier (6) is coupled to a latch mechanism (5) in order to fasten the carrier (6) in the closed position against the force of an energy store, wherein the latching mechanism (5) can be released by moving the guide rail (3) in the closing direction in order to move the carrier (6) by the activator (10) and the guide rail (3) by the energy store in the opening direction. According to the invention, the activator (10) has a flexible lever (11) which, in the closed position, can be decoupled upon the carrier (6) exceeding a tensile force on the guide rail (3). An extensively wear-free decoupling of the activator is thus possible by tensile forces.