Seating device with a reclining function
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Solution Overview
Problem
Existing reclining seating devices often provide inadequate lumbar support, as the lumbar support mechanism moves in relation to the user's spine when the chair back reclines, leading to discomfort, and previous solutions have been complex and ineffective.
Innovation Solution
A reclining function seating device featuring a seat, a back element with a rotatable hinge member, and a back frame incorporating resilient elements with prestress and coordinated firmness to maintain ergonomic lumbar support in both sitting and reclining positions, utilizing a combination of materials like high carbon steel wire and padding to adapt to the user's anatomy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the backrest is made rigid with fixed lumbar support, then the lumbar support is stable and provides consistent support in upright position, but the lumbar support moves upward and becomes uncomfortable when the chair reclines
Solution Approach 1:
The back frame incorporates resilient elements that allow the lumbar support to dynamically adjust its position and shape based on the backrest angle. As the chair reclines, the resilient elements deform to maintain proper lumbar support alignment, preventing the support from moving upward and becoming uncomfortable.
Solution Approach 2:
The resilient elements change their physical parameters (shape, position, firmness) in response to the backrest angle. This allows the lumbar support to adapt its characteristics dynamically - maintaining stability in upright position while becoming more compliant and adjusting position during reclining to preserve comfort.
2Adaptability or versatility
If the lumbar support is made soft and compliant, then the lumbar support adapts well to the user's spine in reclining position, but the lumbar support becomes insufficient and loses support effectiveness in upright sitting position
Solution Approach 1:
The resilient elements dynamically adjust their compliance based on the backrest angle. In upright position, they maintain sufficient firmness to provide effective lumbar support. During reclining, they become more compliant and adapt to the user's spine, ensuring comfort and continued support effectiveness across different positions.
3Ease of operation
If complex mechanisms are used to maintain lumbar support during reclining, then the lumbar support remains comfortable in all positions, but the device complexity increases significantly
Solution Approach 1:
The resilient elements automatically adjust the lumbar support position and shape in response to backrest angle changes without requiring external control mechanisms. The system self-regulates based on the physical deformation of the resilient elements, eliminating the need for complex mechanical or electronic control systems while maintaining comfort across all positions.
Solution Approach 2:
The invention achieves comfortable lumbar support in all positions by utilizing the natural parameter changes of resilient elements under different loading conditions and angles, rather than employing complex active adjustment mechanisms. This passive adaptation approach significantly reduces device complexity.
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 device ensures consistent and comfortable lumbar support across various positions by redistributing weight and adjusting the shape of the backrest, maintaining ergonomic alignment with the user's spine, even when reclined, thereby addressing the limitations of previous designs.
Implementation Method 1
a back frame (4) comprising at least one first resilient element (7) and one or more second resilient elements (8)
Data Source
AI summary
A seating device (1) with a reclining function comprising a back frame (4) which provides a significant reduction in the complexity of the system, at the same time as it gives the user increased comfort both in an upright (sitting) position and in a reclining position. The back frame (4) comprises in particular two types of resilient elements (7, 8) and rotatable fasteners (6) which provide adaptive support to the lumbar spine in both a sitting and reclining position.