Synchronization Rod Cross-Section Design to Prevent Extrusion Twisting
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Solution Overview
Problem
Existing synchronization rods for furniture drives suffer from twisting of the inner contour during the extrusion process, leading to improper synchronization and high scrap rates due to component tolerances.
Innovation Solution
The synchronization region features a first outer contour portion as a circular segment with an angular range of 250° to 330°, accompanied by a further outer contour portion that deviates from a circular segment, arranged exclusively on one side of the synchronization rod. This design reduces twisting during extrusion and maintains an aesthetically pleasing round appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a round cross-sectional profile is used for the synchronization rod, then the visual appearance is aesthetically pleasing, but the inner contour twists during extrusion leading to imprecise synchronization
Solution Approach 1:
The patent applies asymmetry by introducing a non-circular contour portion to the otherwise circular cross-section. This asymmetric feature acts as a reference that prevents rotation during extrusion, ensuring the inner contour remains properly oriented for precise synchronization while maintaining overall circular appearance from most viewing angles.
2Productivity
If the extrusion process is used to produce the synchronization region, then manufacturing efficiency is improved, but the long longitudinal extension of raw material causes rotation and twisting during extrusion
Solution Approach 1:
The patent applies preliminary action by incorporating the anti-rotation contour feature into the extrusion mold design before the extrusion process begins. This pre-configured asymmetric geometry prevents twisting during the extrusion of long synchronization rods, maintaining contour accuracy throughout the manufacturing process.
3Manufacturing precision
If component tolerances are reduced to ensure precise synchronization, then synchronization accuracy is improved, but the proportion of rejected synchronization rods increases due to twisting
Solution Approach 1:
The asymmetric contour portion serves as a built-in anti-rotation mechanism that eliminates twisting variability caused by tolerances. By preventing rotation during extrusion, the inner contour maintains consistent orientation and positioning, reducing the need for tight component tolerances and minimizing scrap due to synchronization errors.
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 effectively prevents twisting of the synchronization region, ensuring precise synchronization of furniture drives while maintaining a visually appealing round appearance, thereby reducing scrap rates and enhancing manufacturing efficiency.
Implementation Method 1
The synchronization region in a cross-section orthogonal to the longitudinal extension has a first outer contour portion in the form of a circular segment and at least one further outer contour portion, preferably adjacent to the first outer contour portion, in the form of a geometry deviating from a circular segment
Data Source
AI summary
A synchronization rod for furniture drives for the synchronous moving of movable furniture parts, includes a coupling portion for connection to a furniture drive and a synchronization portion along a length of the synchronization rod, more particularly arranged between two opposite coupling portions. The synchronization portion, as seen in a cross-section taken orthogonally to the length, has a first outer contour portion in the form of a circular segment and a further outer contour portion, preferably adjacent to the first outer contour portion, having a geometry in a form that is not a circular segment. The circular segment comprises an angular range of between 250° and 330° and/or an angular range of between 180° and 350°, and the further outer contour portion is arranged exclusively on one side of the synchronization rod.