Furniture drive

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Solution Overview

Problem

Furniture drives face challenges in adapting torque to varying weights and loading conditions of movable furniture parts, leading to either inability to move the part into a raised position or unreasonably high force usage.

Innovation Solution

Incorporation of a second adjusting contour with a different torque curve and a switching device that can be manually or automatically activated, allowing the pressure piece to move along the second contour based on weight and loading conditions, ensuring appropriate torque application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If the torque of the spring device is increased to move heavy furniture parts into a raised position, then the furniture part can be moved into the raised end position, but the furniture part will shoot up with unreasonably high force

Engineering Contradiction:
ImprovetorqueVSAvoidexcessive force
Core Design Contradiction:
ForceVSObject-generated harmful factors

Solution Approach 1:

The patent applies dynamics by making the torque characteristic dynamically adjustable through multiple selectable contours. Instead of a fixed torque curve, the system provides several predefined torque curves (first, second, third adjusting contours) that can be selected based on the actual load conditions. This allows the torque to be optimized in real-time according to the furniture part's weight and desired movement characteristics, preventing both insufficient torque for heavy parts and excessive torque for lighter parts.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by varying the torque curve parameters across different adjusting contours. Each contour represents a different torque profile with specific characteristics (e.g., higher initial torque, lower initial torque, different torque distribution throughout the movement range). By changing which contour is active, the system adjusts the torque parameters to match the load requirements, thereby avoiding the application of unreasonably high force while ensuring sufficient torque for heavy furniture parts.

Inventive Principle:
Principle #35Parameter changes

2Object-generated harmful factors

If the torque of the spring device is decreased to avoid excessive force, then the furniture part moves smoothly, but the movable furniture part cannot be moved into the raised end position

Engineering Contradiction:
Improveexcessive forceVSAvoidability to move into raised position
Core Design Contradiction:
Object-generated harmful factorsVSReliability

Solution Approach 1:

The system dynamically selects the appropriate torque contour based on the furniture part's weight and loading conditions. For heavy furniture parts, a torque contour with higher torque values is selected to ensure the part can be moved into the raised end position. For lighter parts, a contour with lower torque values is selected to prevent excessive force. This dynamic adaptation resolves the contradiction between needing sufficient torque for reliability and avoiding excessive force.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the torque parameters by selecting from multiple predefined contours. Each contour is optimized for specific load ranges and movement requirements. By adjusting which contour is active, the system ensures that the torque parameters are always appropriate for the current situation - high enough to move heavy parts reliably but low enough to prevent excessive force application.

Inventive Principle:
Principle #35Parameter changes

3Device complexity

If a single torque curve is used for all furniture parts, then the device structure is simple, but the torque cannot be adapted to different weights and loading conditions

Engineering Contradiction:
ImprovestructureVSAvoidtorque adaptation
Core Design Contradiction:
Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent applies segmentation by dividing the single torque curve into multiple discrete torque contours (first, second, third adjusting contours). Each contour is a separate, selectable torque profile optimized for specific load conditions. This segmentation allows the system to offer multiple torque characteristics without creating a continuously complex adjustable mechanism. The switching device selects among these segmented options based on the furniture part's weight, thereby achieving adaptability while maintaining relatively simple device structure.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent implements universality by designing a multi-functional torque adjustment system where a single furniture drive mechanism can serve multiple purposes by selecting from different torque contours. The same basic mechanism structure handles both light and heavy furniture parts by switching between predefined torque profiles, eliminating the need for entirely different mechanisms for different load types. This multi-functionality achieves adaptability without proportionally increasing device complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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 precise adjustment of torque to accommodate different weights and loading states, ensuring smooth and controlled movement of furniture parts without excessive force, improving adaptability and safety.

Implementation Method 1

a spring device (10) for applying force to the actuating arm (6)

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentEP3449076B1Furniture drive
Publication Date: 2023.08.30 JULIUS BLUM GMBH
  • EP3449076B1 patent drawingFigure 1a~1b
  • EP3449076B1 patent drawingFigure 2a~2b
  • EP3449076B1 patent drawingFigure 3

AI summary

A furniture drive (4) for a furniture part (3) which is mounted movably relative to a furniture body (2), comprising: at least one pivotably mounted adjustment arm (6) for moving the movable furniture part (3), a spring device (10) for subjecting the adjustment arm (6) to force, a transmission mechanism (33) for transmitting a force of the spring device (10) to the adjustment arm (6), wherein the transmission mechanism (33) has a first adjustment contour (24) with a first torque profile, and a thrust piece (26) which is loaded by the spring device (10), wherein, during movement of the adjustment arm (6), the thrust piece (26) is movable along the first adjustment contour (24), wherein at least one second adjustment contour (27) having a second torque profile differing from the first torque profile, and a switching device (9) are provided, wherein the at least one second adjustment contour (27) can be brought into engagement with the thrust piece (26) by the switching device (9) such that, during movement of the adjustment arm (6), the thrust piece (26) is movable along the second adjustment contour (27).