Seat chassis
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Solution Overview
Problem
Existing seating furniture chassis lack compactness and efficient space utilization, particularly in designs with coupled backrest and seat surface movements, as they often require significant installation space and do not optimize aesthetic appearance.
Innovation Solution
A seating furniture chassis with a drive mechanism that adjusts the backrest and seat surface frames, featuring a translation mechanism connected to the backrest frame, pivotable about a virtual axis defined by two pivot points, and guide members for compact and space-efficient design, allowing for automatic height adjustment and minimal visual impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a drive mechanism is added to adjust the backrest frame and seat surface frame, then the functionality and user convenience are improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent combines the drive mechanism with the translation mechanism, where the drive mechanism is integrated into the translation mechanism's structure. The drive mechanism includes a drive shaft that directly engages with the translation mechanism's threaded rod, merging the driving function with the translation function into a single integrated assembly, thereby reducing overall device complexity while maintaining adjustability
Solution Approach 2:
The translation mechanism serves multiple functions: it converts rotational motion from the drive mechanism into linear motion for adjusting the backrest frame position, simultaneously adjusts the seat surface frame position, and provides structural support for both frames. This multi-functionality reduces the need for separate adjustment mechanisms, lowering device complexity
2Volume of moving object
If the drive mechanism is arranged below the seat surface frame, then the space utilization is improved, but the manufacturing and assembly difficulty increase
Solution Approach 1:
The drive mechanism is segmented into modular components: a drive shaft with external threading, a translation mechanism with a threaded rod, and connection elements. These segmented components can be manufactured separately using standard machining processes and then assembled by simply engaging the threaded portions, making assembly straightforward despite the compact arrangement below the seat surface frame
Solution Approach 2:
The translation mechanism acts as an intermediary between the drive shaft and the backrest/seat surface frames. It converts the rotational motion of the drive shaft into linear motion that simultaneously adjusts both frames. This intermediary simplifies the connection logic and assembly process, as the translation mechanism provides a standardized interface between the drive and the adjustable components
Data Source
AI summary
A seating furniture chassis comprises a seat surface frame, a backrest frame, two armrests, and a drive mechanism. The backrest frame is pivotable about a virtual pivot axis defined by two pivot points, wherein the backrest frame is fastened to the pivot points on the armrests. The drive mechanism is connected to the backrest frame by a translation mechanism. The drive mechanism is designed to trigger a translation of the translation mechanism, wherein the translation is converted into a pivoting movement of the backrest frame about the pivot axis. The backrest frame is connected below the pivot points to the seat surface frame so that during the pivoting movement the seat surface frame is moved translationally. The drive mechanism is arranged below a first lateral edge region of the seat surface frame.