Synchronized Seat-Back Carrying Arm for Elastic Recline Support
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Solution Overview
Problem
Existing seating arrangements often require complex mechanisms to manage the movement of seat and backrest, leading to inefficient force distribution and unhealthy posture due to lack of defined elastic adjustment and synchronization between the seat surface and backrest.
Innovation Solution
A seating arrangement featuring a carrying arm with upper and lower carriers connected by mechanical linking members, allowing for predeterminable elastic deformation and cinematic synchronization between the seat surface and backrest, eliminating the need for intermediate mechanisms and optimizing force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid, curved supporting lever is used to guide and support the seat shell, then the seat shell can be supported resiliently, but the mechanism becomes heavy to intercept the torque produced by the sitting individual
Solution Approach 1:
The carrying arm is divided into multiple segments (first carrying arm portion, second carrying arm portion, third carrying arm portion) connected by articulations. This segmentation allows each segment to be lighter while maintaining overall structural strength through the distributed articulation mechanism that manages forces and moments.
Solution Approach 2:
The patent employs dynamic elements including a flexibly resilient plate that allows relative movement between seat panels, and articulations that enable controlled motion. These dynamic features provide resilience and adaptability without requiring heavy rigid structures, allowing the mechanism to absorb and distribute loads efficiently.
2Ease of operation
If two seat panels are arranged one above the other with the upper panel supported by a flexurally elastic plate, then the chair reacts sensitively to body shifting, but the substructure is subjected to pronounced loading and must be dimensioned correspondingly
Solution Approach 1:
The seat is divided into first and second seat panels that can move independently relative to each other. The flexurally elastic plate provides controlled flexibility between panels, allowing body movement detection while distributing loads through the carrying arm structure rather than concentrating them on the substructure.
Solution Approach 2:
The flexurally elastic plate acts as an intermediary element between the two seat panels, providing the necessary flexibility for body movement detection while transferring forces through the carrying arm mechanism. This intermediary structure reduces the direct loading on the substructure by distributing forces through multiple components.
3Adaptability or versatility
If the backrest is formed by two skins with multiplicity of articulations connected by ribs, then the backrest can adapt to every contour, but without ribs the skins behave like a link chain that encourages rounded-back posture
Solution Approach 1:
The backrest is segmented into multiple articulations between the first and second carrying arm portions, allowing contour adaptation through controlled movement. The ribs connect these articulated sections, providing structural stability that prevents the skins from behaving like an unstable link chain, thereby maintaining healthy posture support.
Solution Approach 2:
The backrest combines flexible skin materials with rigid rib structures to create a composite system. The skins provide contour adaptation capability while the ribs provide structural stability, creating a balanced system that both adapts to body contours and maintains proper posture support without encouraging rounded-back positioning.
4Reliability
If a single-piece seat shell is articulated on a substructure and guided by a rigid supporting lever, then the seat can be supported resiliently, but a heavy mechanism is necessary to intercept the torque
Solution Approach 1:
The seat shell is divided into functionally separate first and second seat panels that move independently. This segmentation allows the support mechanism to be distributed across multiple carrying arm portions and articulations, reducing the complexity and weight of any single mechanism while maintaining reliable support through the coordinated 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
The solution provides a consistent, repeatable motion between upright and reclined positions, promoting healthy posture and efficient force distribution without complex mechanisms, ensuring comfort and stability.
Implementation Method 1
The elastic deformation of the carrying arm takes place in the region of the at least one linking member and is brought about by the at least one linking member, which keeps the carriers at a defined spacing apart from one another along the contour of the carrying arm as far as the common, no longer displaceable end.
Data Source
AI summary
The invention relates to a seating arrangement (1) having a substructure (3), in which the seating arrangement (1) comprises at least one carrying arm (7, 8), and the carrying arm (7, 8) comprises an upper, first carrier (7a, 8a) and a lower, second carrier (7b, 8b).