Furniture drive
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing furniture drives for ejecting movable parts from closed positions are not compact and efficient, particularly when dealing with heavily loaded drawers or doors that protrude minimally into the furniture body.
Innovation Solution
A furniture drive with a reduction mechanism using an angled lever that converts pivoting movement into linear movement, allowing adjustable force redirection and transmission, enabling high torque for initial ejection and reduced power transmission for extended movement, facilitating compact design and efficient ejection of heavily loaded furniture parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional furniture drive is used to eject movable parts, then the ejection function is achieved, but the design is not compact and efficient especially for heavily loaded drawers or doors that protrude minimally
Solution Approach 1:
The patent implements a variable transmission ratio mechanism where the transmission ratio changes dynamically during the ejection process. Initially, when the drawer is in the closed position, the transmission ratio is high to provide maximum torque for breaking static friction. As the ejection progresses, the transmission ratio decreases to allow faster movement, optimizing both compactness and ejection efficiency for heavily loaded parts.
Solution Approach 2:
The invention changes the transmission ratio parameter during operation. By using an angled lever mechanism with specific geometric relationships, the transmission ratio varies as a function of the lever angle, enabling high force multiplication at the start of ejection and smoother operation thereafter, thus achieving compact design without sacrificing ejection capability.
2Force
If high torque is provided for initial ejection of heavily loaded drawers, then ejection from closed position is achieved, but the mechanism becomes more complex
Solution Approach 1:
The ejection process is segmented into two phases with different transmission ratio requirements. The first phase (from closed position to a predetermined angle) uses high transmission ratio for torque multiplication. The second phase uses lower transmission ratio for faster movement. This segmentation is achieved through the geometric configuration of the angled lever and rack mechanism, providing high initial torque without requiring complex additional components.
Solution Approach 2:
The angled lever acts as an intermediary element between the motor and the rack. It converts the rotational motion of the motor into linear motion of the rack while providing variable torque multiplication. This intermediary mechanism achieves high initial torque with a relatively simple geometric configuration rather than complex gear trains or multiple stages.
3Speed
If the transmission ratio is reduced for extended movement, then travel transmission is increased, but power transmission is reduced
Solution Approach 1:
The transmission ratio is made dynamic rather than fixed. During the initial phase of ejection (from closed position to predetermined angle), the transmission ratio is high to provide necessary power. As the lever rotates further, the transmission ratio automatically decreases, allowing the rack to move faster with less force requirement, thus achieving both speed and power optimization at different stages of the ejection process.
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 angled lever mechanism provides high power transmission for initial ejection, ensuring heavily loaded drawers and doors can be easily opened while maintaining a compact design, and adjustable geometry for versatile application.
Implementation Method 1
a reduction mechanism, which converts a pivoting movement of the ejection lever into a linear movement of the ram, the reduction mechanism having at least one angled lever with two lever arms
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a furniture drive (4) for ejecting a movable furniture part (3) from a closed end position in relation to a furniture body (2), comprising: a housing (9); an electrical drive unit (10) arranged in or on the housing (9); an ejecting lever (12), which can be driven by the electrical drive unit (10) and which is supported in such a way that the ejecting lever can be rotated about a pivot axis (11) in relation to the housing (9); a tappet (6) for ejecting the movable furniture part (3), which tappet can be driven by the ejecting lever (12) and can be moved linearly; wherein the furniture drive (4) has a reduction mechanism (5), which converts a pivoting motion of the ejecting lever (12) into a linear motion of the tappet (6), wherein the reduction mechanism (5) has at least one angle lever (15), which is rotatably supported about an axis of rotation (16) and which has two lever arms (18, 19), wherein a first lever arm (18) of the angle lever (15) interacts with the ejecting lever (12) and a second lever arm (19) of the angle lever (15) interacts with the linearly movable tappet (6) and wherein the axis of rotation (16) of the angle lever (15) and the pivot axis (11) of the ejecting lever (12) are arranged so as to be stationary in relation to each other.