Toothed Ejection Lever for Slip-Free Furniture Drive Torque
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Solution Overview
Problem
Existing furniture drives with ejection levers experience inefficient power transmission due to non-positive contact, leading to slip and reduced efficiency when moving furniture parts, especially those with small protrusions or deep furniture bodies.
Innovation Solution
The ejection lever is equipped with toothing that allows for positive force transmission, featuring a non-circular design with adjustable sections to optimize torque distribution, enabling high initial torque for heavy loads and reducing noise through sound-absorbing coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If non-positive contact (sliding support) is used for power transmission, then the structure is simple, but power transmission efficiency is low due to slip
Solution Approach 1:
The ejection lever is divided into two separate ejection lever parts (first and second parts) that can be adjusted relative to each other. The toothing is provided on one of these parts, creating a segmented structure that enables positive power transmission while maintaining adjustability for different application requirements.
Solution Approach 2:
The toothing acts as an intermediary mechanism between the ejection lever and the furniture part. Instead of direct sliding contact, the toothing engages with corresponding features to transmit force positively, eliminating slip while the intermediate space allows for force transmission during ejection.
2Adaptability or versatility
If fixed length ejection lever is used, then manufacturing is simple, but adaptability to different furniture configurations is limited
Solution Approach 1:
The ejection lever is designed with adjustable length through the relative movement of the first and second ejection lever parts. This dynamic adjustment capability allows the lever to be configured for different furniture types and drawer depths, transforming a static component into an adaptable one without requiring multiple fixed-length levers.
Solution Approach 2:
The length parameter of the ejection lever can be changed by adjusting the position of the ejection lever parts relative to each other. This parameter adjustment enables the same lever mechanism to work effectively with different furniture configurations, from shallow to deep drawers, without changing the overall device structure.
3Power
If uniform toothing is used throughout, then manufacturing is simple, but torque optimization across different rotation angles is not achieved
Solution Approach 1:
The toothing is not uniformly distributed but is strategically positioned on specific sections of the ejection lever parts. This local concentration of toothing features allows for optimized torque transmission at critical rotation angles while reducing manufacturing complexity compared to complex non-circular gear designs. The toothing is provided at least in regions rather than uniformly throughout.
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 solution provides slip-free, angularly accurate power transmission with high efficiency, effectively ejecting heavily loaded drawers from closed positions without issues, while minimizing noise and optimizing drive torque curves.
Implementation Method 1
the ejection surface of the ejection lever has a toothing at least in regions... positive force transmission can be made possible, with significantly higher forces being able to be transmitted compared to non-positive transmission. The form-fitting transmission enables slip-free, angularly accurate transmission of the rotational movement
Implementation Method 2
the toothing and/or the counter-toothing interacting with the toothing can be provided with a sound-absorbing coating, at least in some areas
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a furniture drive (4) for ejecting a moveable furniture part (3) from a closed end position relative to the body of the item of furniture (2), comprising; a housing (9), an electric drive unit (10) which is arranged in or on the housing (9), an ejection lever (12) which can be driven by the electric drive unit (10) for transferring a movement to the moveable furniture part (3). The ejection lever (12) is mounted so that it can rotate about a rotational axis (11) on one side and comprises a free lever end (13) on the other side. Said ejection lever (12) comprises an ejection surface (14) between the rotational axis (11) and the free lever end (13). Said ejection surface (14) of the ejection lever (12) comprises, at least in sections, a toothing (15).