Drawer Ejection and Retraction Mechanism for Easy Closed Alignment
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Solution Overview
Problem
Existing opening and closing devices for movable furniture parts require precise installation to maintain a predetermined closed position, making them difficult to assemble and handle conveniently.
Innovation Solution
An ejection device with a pretensioned driver, a pivotable lever as a stop, and a retraction device that ensures the closed position is maintained by the carriage's contact with the lever, allowing for easy assembly and handling without precise alignment of the furniture part. The device includes an adjustable ejection stop and energy accumulator, enabling flexible adaptation to different furniture widths and weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the closed position is predetermined by precise installation, then the panel image is attractive, but the assembly is difficult and time-consuming
Solution Approach 1:
The system performs self-alignment through the guided closing path defined by the guide rail and carriage mechanism. The movable furniture part automatically finds its correct closed position through the mechanical guidance system, eliminating the need for precise pre-installation alignment by the installer.
Solution Approach 2:
The guide rail and carriage are pre-installed with fixed geometry that defines the closing path. This preliminary structural setup ensures that when the movable part is installed, it will naturally follow the predetermined path to achieve the correct closed position without requiring precise adjustment during assembly.
2Reliability
If the movable furniture part is held in a predetermined closed position, then the opening device is unlocked, but the installation requires very precise positioning
Solution Approach 1:
The mechanical linkage system consisting of the carriage, lever, and driver replaces the need for precise manual positioning. The mechanical elements work together to automatically establish and maintain the correct closed position through their geometric relationships and motion constraints.
Solution Approach 2:
The guide rail and carriage system serves multiple functions: it guides the closing motion, determines the closed position, and provides the mechanical linkage for the opening/closing mechanism. This multi-functionality reduces the need for separate precise positioning systems.
3Force
If the driver is pretensioned by an energy accumulator, then the ejection force is sufficient, but the system complexity increases
Solution Approach 1:
The energy accumulator and spring mechanism are extracted as separate, modular components that can be independently selected and adjusted. This allows the ejection force function to be provided without integrating complex force generation systems into the main structure.
Solution Approach 2:
The ejection force can be adjusted by changing parameters of the energy accumulator, such as spring constant or pre-compression distance. This allows flexible adaptation to different furniture weights and dimensions without redesigning the entire ejection mechanism.
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 simplifies the assembly and handling of movable furniture parts by allowing the user to position them only until the ejection device is tensioned, with the retraction device ensuring stability in the closed position, and allows for adjustable forces to accommodate various furniture types, reducing the need for precise alignment and minimizing impact noises.
Implementation Method 1
a driver (26) which is pretensioned by an energy accumulator (29) and which can be locked in an end position on the guideway (22)
Implementation Method 2
a magnet (11) arranged on the ejection stop (10), which can be coupled to a metallically fixed activator (7)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to an opening and closing device for movable furniture parts, in particular drawers (3), comprising a draw-in device (40) and an ejection device (6), wherein the ejection device (6) comprises a driver (26), which is preloaded by an energy accumulator (29) and can be locked in an end position of a guide track (22) and coupled to a slide (15), wherein a pivotable lever (30) is provided, which forms a stop for the slide (15) and by means of which the driver (26) can be unlocked from the end position.