Drawer Drive Synchronization Rod for Skew-Free Assembly
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Solution Overview
Problem
Existing drive devices for movable furniture parts, such as drawers, face complications in synchronizing movements without causing undesired skewing or tooth errors during assembly, particularly due to complex gear configurations and telescopic designs that require precise alignment.
Innovation Solution
A drive device with a synchronizing rod and elements that remain permanently connected to the ejection devices, utilizing a non-circular cross section for a form fit and allowing motion transformation from rotary to translational movement, eliminating the need for telescopic extensions and reducing the risk of skewing or tooth errors, with the synchronizing rod being detachable but unchangeable in length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gear wheel and gear rack configuration is used for synchronization, then synchronization function is achieved, but assembly complexity increases and tooth errors may occur
Solution Approach 1:
The synchronizing device is divided into separate components: a synchronizing rod that can be detached, and synchronizing elements that remain permanently connected to the ejection devices. This segmentation eliminates the need for complex gear wheel and gear rack assemblies, reducing assembly complexity while maintaining synchronization reliability through the form-fit connection of the non-circular cross-section components.
2Adaptability or versatility
If a telescopic gear rack configuration is used to adapt to different distances, then adaptability is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
Instead of using a telescopic configuration with multiple movable segments, the invention employs a synchronizing rod with a non-circular cross-section that maintains a fixed length. The adaptability to different distances is achieved through the form-fit connection geometry rather than mechanical extension, thereby reducing device complexity while preserving adaptability.
3Reliability
If the synchronizing rod is stationarily connected to actuating devices, then synchronization is achieved, but the risk of skewed assembly and tooth errors increases
Solution Approach 1:
The synchronizing rod features a non-circular (asymmetric) cross-section that creates a form-fit connection with the synchronizing elements. This asymmetric geometry prevents skewed assembly by allowing insertion in only one correct orientation, thereby eliminating tooth errors and improving manufacturing precision while maintaining synchronization accuracy.
4Reliability
If complex gear wheel attachment is used in holding jack, then synchronization function is achieved, but ease of manufacture decreases
Solution Approach 1:
The invention extracts the gear wheel from the holding jack assembly, replacing it with a simpler synchronizing rod that has a non-circular cross-section. The synchronizing elements remain permanently connected to the ejection devices without requiring complex attachment mechanisms. This extraction simplifies the manufacturing process and ease of assembly while maintaining the synchronization function through the form-fit connection.
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
Ensures easy and uncomplicated synchronization with reduced risk of assembly errors, maintaining constant contact between synchronizing elements and ejection devices, and allowing only necessary movement synchronization, enhancing the operational reliability and ease of assembly.
Implementation Method 1
utilizing a non-circular cross section for a form fit
Implementation Method 2
allowing motion transformation from rotary to translational movement
Data Source
AI summary
A drive mechanism for a movable furniture part, in particular a drawer, has a first and a second lockable pushing-out mechanism and a synchronizing mechanism for synchronizing the two pushing-out mechanisms. The synchronizing mechanism has a synchronizing rod and a first and a second synchronizing element which can be connected to the synchronizing rod, and relative movement takes place between the synchronizing elements and the pushing-out mechanisms during synchronizing operation. In an active synchronizing mode, during synchronizing operation, movement is transmitted from the first pushing-out mechanism, via the first synchronizing element, the synchronizing rod and the second synchronizing element, to the second pushing-out mechanism. In an inactive synchronizing mode, the synchronizing rod is removed and the synchronizing elements each remain in contact with one of the pushing-out mechanisms.