Seat Support Structure With Weight-Adaptive Rocking Geometry
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Solution Overview
Problem
Conventional load support structures, such as seating structures, face challenges in providing comfortable posture and stability across varying body weights due to complex designs and high costs, often resulting in unhealthy rounded-back postures and excessive constructional complexity.
Innovation Solution
A load support structure featuring a seat with a complex mechanism that utilizes a rocking device to change spring forces, comprising a front and rear seat part, a lower and upper backrest part with supporting arms, and a guide element to facilitate a pulling-back movement, allowing for active displacement and compensation of potential energy loss, thereby reducing the need for weight-dependent spring adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex mechanism with rocking device and guide elements is used to automatically change spring forces, then adaptability to different body weights is improved, but device complexity increases
Solution Approach 1:
The supporting arm uses arcuate profiles in regions B and C that enable automatic geometric adaptation to different body weights through rocking movement. The dynamic geometry of the arcuate supports changes the effective spring characteristics based on the loaded position, eliminating the need for complex adjustable mechanisms while maintaining adaptability across different user weights.
Solution Approach 2:
The invention changes the geometric parameters of the supporting arm through arcuate profiles, allowing the structure to automatically adjust its mechanical characteristics. The curved geometry transforms the spring force characteristics based on the rocking angle, providing weight-adaptive support without additional complex components.
2Loss of energy
If the front seat part is actively pulled back by the upper support, then loss of potential energy is compensated, but device complexity increases
Solution Approach 1:
The pulling-back function is merged into the normal rocking movement of the supporting arm. The arcuate geometry of the supports causes the front seat part to be automatically pulled back as part of the natural rocking motion when the backrest is loaded, eliminating the need for separate energy compensation mechanisms.
Solution Approach 2:
The supporting arm structure performs self-service by automatically compensating for potential energy loss through its geometric design. The arcuate profiles cause the front seat part to move backward during rocking, generating the necessary pulling force without external intervention or additional components.
3Manufacturing precision
If multiple connecting links and guide elements are used to define movement paths, then movement precision is improved, but device complexity increases
Solution Approach 1:
The invention uses arcuate (curved) profiles for the upper and lower supports in regions B and C to define the movement path. This curved geometry naturally guides the rocking motion and defines precise movement trajectories without requiring multiple straight connecting links or complex guide elements, reducing overall device complexity while maintaining movement precision.
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 structure provides comfortable seating with reduced energy storage requirements, maintaining equilibrium between seat and backrest parts, allowing for healthy posture across different body weights without the need for weight-specific spring adjustments, enhancing user comfort and reducing construction complexity.
Implementation Method 1
the upper support and the lower support having an arcuate profile in the region B of the rear seat part and in the region C of the lower backrest part
Data Source
AI summary
A body support structure includes a frame and a membrane attached to the frame. The membrane includes elastomeric filaments. The membrane includes different regions with different stiffness. The membrane may form a part of a seat or a backrest.