Seating Chassis Layout for Fold-In Footrest Clearance
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Solution Overview
Problem
Existing seating furniture chassis with lever mechanisms for raising and lowering seat faces cannot be used in combination with foldable footrests, as the components required for the lever mechanism and motor occupy the space where the footrest would be in the folded-in state.
Innovation Solution
A seating furniture chassis design with a lever mechanism, connecting means, and drive means where the clearance below the plane defined by the connecting means allows a footrest to pivot in, keeping the lever mechanism and drive means outside this clearance, enabling the use of a foldable footrest below the seat face in the folded-in state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lever mechanism and drive means are arranged in the conventional position, then the seat face can be raised and lowered effectively, but the footrest cannot be folded in below the seat face
Solution Approach 1:
The lever mechanism is repositioned from a horizontal arrangement to a vertical arrangement along the rear edge of the seat face. This dimensional change allows the footrest to occupy the previously horizontal space below the seat face, enabling the footrest to fold in while the lever mechanism operates vertically to raise and lower the seat face.
2Adaptability or versatility
If the clearance below the seat face is occupied by lever mechanism components, then the seat face can be raised and lowered, but the footrest cannot be positioned below the seat face
Solution Approach 1:
The lever mechanism is extracted from the clearance space below the seat face and repositioned to operate along the rear edge of the seat face. This extraction eliminates the spatial conflict, allowing the footrest to be positioned below the seat face while the lever mechanism maintains its raising and lowering functionality from the rear position.
3Adaptability or versatility
If the lever mechanism is repositioned to allow footrest folding, then the footrest can be folded in below the seat face, but the lever mechanism arrangement becomes more complex
Solution Approach 1:
The lever mechanism is designed to perform multiple functions: it raises and lowers the seat face while simultaneously providing the structural framework that defines the clearance space for the footrest. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity despite the repositioning.
Data Source
AI summary
A seating furniture chassis including: a lever mechanism (2) for raising and lowering a seat face of a seating furniture item; a connecting mechanism (4) for connecting the lever mechanism (2) to the seat face; and a drive mechanism (3) for actuating the lever mechanism (2). A plane is defined by way of the connecting mechanism (4), in which plane the seat face lies in the mounted state. The seating furniture chassis (1) has a clearance below the plane, which clearance is free from the lever mechanism (2) and the drive mechanism (3). A footrest of the seating furniture item is pivotable into the clearance.