Pivotable Beam Seating Support for Simplified Elastic Sheet Tensioning
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Solution Overview
Problem
Existing sofa support arrangements lack ease of assembly and sufficient rigidity, particularly when used in larger furniture pieces, as they require high manual effort to achieve and maintain tension in stretched sheets.
Innovation Solution
A seating furniture support arrangement featuring pivotable longitudinal beams that stretch elastic sheets between fixed points, allowing for easy assembly and high tension retention, with the beams acting as stretching members and the elastic sheets folding around them for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stretching mechanism is used to tension the elastic sheet, then the support rigidity is improved, but the device complexity increases and assembly becomes more difficult
Solution Approach 1:
The patent combines the stretching member with the longitudinal beam structure, making the beam itself serve as the stretching mechanism. This integration eliminates separate stretching components while maintaining the ability to tension the elastic sheet effectively, thus improving rigidity without adding device complexity.
Solution Approach 2:
The longitudinal beam is designed to perform dual functions: structural support and sheet tensioning. By making the beam itself the stretching member that applies force to tension the elastic sheet, the structure serves its own stretching needs without requiring external specialized mechanisms, simplifying the overall device.
2Stability of the object's composition
If high tension is applied to the elastic sheet for rigidity, then the support stability is improved, but the ease of operation deteriorates due to excessive manual force required
Solution Approach 1:
The patent employs a dynamic tensioning system where the longitudinal beam can pivot or move during assembly to apply tension to the elastic sheet. After assembly, the system locks into a stable configuration. This dynamic approach allows high tension to be achieved during assembly without requiring excessive sustained manual force, as the mechanism itself facilitates the tensioning action.
Solution Approach 2:
The tensioning process involves a periodic action where the stretching member is moved to apply tension, then locked in position. This allows the assembly process to be broken into manageable steps where force is applied intermittently rather than continuously, making assembly easier while still achieving the necessary high tension for stability.
3Strength
If the elastic sheet is stretched between fixed points, then the support rigidity is improved, but the adaptability to larger furniture pieces deteriorates
Solution Approach 1:
The longitudinal beam is designed as a universal component that serves multiple functions: structural support, sheet tensioning, and adjustable positioning. This multi-functionality allows the same basic structure to be adapted to different furniture sizes and configurations, maintaining rigidity while increasing versatility for larger furniture pieces.
Solution Approach 2:
The support structure is divided into modular longitudinal beams that can be configured in different arrangements. This segmentation allows the same basic tensioning mechanism to be scaled and adapted to various furniture sizes, from small to large pieces, while maintaining the rigidity provided by the elastic sheet tensioning system.
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 simplifies the assembly process while achieving high rigidity and tension in the support, enabling the use of the arrangement in larger furniture pieces without requiring excessive manual force or elasticity in the sheets.
Implementation Method 1
an elastic sheet for providing support for one of the seat and the backrest
Implementation Method 2
a stretching member pivotable on the frame around a pivot axis. The elastic sheet is connected to the first longitudinal beam offset to said pivot axis so that the first longitudinal beam pivoting with respect to the frame stretches the elastic sheet
Data Source
AI summary
A seating furniture support arrangement (6) for a seat or a backrest, suitable, e.g., for a sofa, comprises a first (8) and a second (10; 12) load-carrying longitudinal beam, each being mountable to a seating furniture frame comprising one or more parts; an elastic sheet (16; 14); and a mechanism for stretching the elastic sheet (16; 14) between the first longitudinal beam (8) and the second longitudinal beam (10; 12). The mechanism comprises a first longitudinal beam (8) pivotable on the frame. The elastic sheet (16; 14), with the said seating furniture support arrangement (6) in installed position, is connected to the first longitudinal beam (8) in such a way that the first longitudinal beam (8) pivoting with respect to the frame, in response to an application of an external force or torque, stretches the elastic sheet (16; 14), the external force or torque working against the tension force of the elastic sheet (16; 14) until a point of maximum tension is reached, past which point of maximum tension the tension force facilitates further pivoting of said first longitudinal beam (8), acting to keep the first longitudinal beam (8) in place in a final position.