Furniture Ejector Force Transmission for Deep-Set Movable Parts
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Solution Overview
Problem
Existing furniture ejection devices are limited in their application to movable furniture parts that protrude only slightly or not at all into the furniture body, such as doors and drawers with depths significantly less than the furniture body, due to the lack of effective force transmission mechanisms.
Innovation Solution
A device with a force transmission system that includes a stop and a ram, where the ejection lever's force is transmitted to the movable furniture part through a loosely resting stop and a plunger, with a spring-actuated mechanism for retraction and an adjustable depth stop for precise alignment, allowing for the ejection of furniture parts with varying depths and sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a motor-driven ejection lever rests loosely on the movable furniture part, then the device can be used with furniture parts that protrude slightly, but the area of application is limited and cannot eject furniture parts with significant depth differences
Solution Approach 1:
A force transmission device consisting of a stop and a plunger is introduced as an intermediary between the ejection lever and the movable furniture part. The stop is fastened on the plunger and protrudes from it, while the plunger is guided in a housing and can be moved out by the ejection lever to transmit force to the furniture part, enabling effective force transmission across larger distances.
Solution Approach 2:
The force transmission device is divided into separate functional components: the stop (fastened on the plunger), the plunger itself (guided in housing), and the housing structure. This segmentation allows each component to perform its specific function while maintaining overall system flexibility and adaptability.
2Manufacturing precision
If the ejection lever directly contacts the movable furniture part, then force transmission is direct, but the device cannot accommodate furniture parts with varying depths and tolerance compensation is limited
Solution Approach 1:
The stop protrudes from the plunger in advance to establish a predetermined contact point with the ejection lever. This preliminary positioning ensures that force is transmitted at the correct moment and location, compensating for manufacturing tolerances and ensuring consistent operation across furniture parts of varying depths.
Solution Approach 2:
The plunger acts as an intermediary that can be moved out by the ejection lever to bridge the gap between the lever and the movable furniture part, enabling precise force transmission while accommodating depth variations through the adjustable depth stop.
3Productivity
If the plunger is guided in a curved housing, then the ejection lever's pivoting movement can be fully utilized, but the device complexity increases
Solution Approach 1:
The housing is designed with a curved guide channel instead of a straight one. This curvature allows the plunger to follow the pivoting motion of the ejection lever more effectively, ensuring that the entire range of motion is utilized for force transmission to the furniture part, thereby improving ejection efficiency.
4Ease of manufacture
If the stop protrudes essentially at right angles from the plunger, then the construction is simplified, but the force transmission direction is limited
Solution Approach 1:
The stop protrudes from the plunger at an angle (essentially at right angles) rather than symmetrically in all directions. This asymmetric design simplifies the construction while still providing effective force transmission in the required direction, balancing manufacturing ease with functional effectiveness.
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
Enables the ejection of furniture parts with depths less than the furniture body, providing a wider range of application and ensuring reliable operation with adjustable settings for tolerance compensation and touch-latch functionality.
Implementation Method 1
the plunger is prestressed in the direction of the ejector lever (that is to say in the mounted state of the device into the furniture body) by means of an energy accumulator, preferably a spring
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3
AI summary
The invention relates to a device (1) for ejecting a movable furniture part (9) from a closed end position in or on a furniture body (8), having an ejector (2) comprising a motor-driven ejector lever (3), wherein a power transmission device interacting with the ejector lever (3) is provided such that the force exerted on the movable furniture part (9) by the ejector lever (3) can be transferred in the mounted state of the device (1) in a furniture body (8), in which the movable furniture part (9) in the closed end position is at a distance from the ejector lever (3).