A Dual Function Chair for Sitting and Kneeling
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Solution Overview
Problem
Conventional dual function chairs for sitting and kneeling often fail to provide adequate support for the lumbar spine and do not adapt well to user height and body shape, leading to discomfort during prolonged use.
Innovation Solution
A convertible chair with a movable backrest and headrest support that adjusts vertically and horizontally, equipped with a sliding-rotary-return device for the backrest and a rotary-sliding mechanism for the headrest, along with a specially shaped five-arm base that allows for low-profile positioning, ensuring proper support and movement in both sitting and kneeling positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the backrest is made fixed and simple in structure, then the device complexity is reduced, but the lumbar spine support and adaptability to user height and body shape deteriorate
Solution Approach 1:
The backrest is designed with dynamic adjustment capabilities, allowing it to move and adapt to different user positions and body shapes. The backrest can be adjusted vertically and horizontally to accommodate varying user heights and provide proper lumbar support, transforming from a static to a dynamic structure that responds to user needs.
Solution Approach 2:
The backrest support structure is divided into multiple adjustable components, including vertical adjustment mechanisms and horizontal positioning elements. This segmentation allows independent adjustment of different portions of the backrest to match the user's spine curvature and body dimensions, enhancing adaptability without requiring an overly complex integrated system.
2Ease of operation
If the chair provides comprehensive support and adjustment mechanisms, then the ergonomic comfort and lumbar support are improved, but the device complexity increases
Solution Approach 1:
The chair incorporates self-adjusting mechanisms that automatically respond to user movement and positioning. The backrest and seat adjustments are designed to work with natural user movements, reducing the need for complex manual controls while maintaining ergonomic comfort and lumbar support throughout prolonged use.
Solution Approach 2:
The adjustment mechanisms are designed to serve multiple functions simultaneously. The same structural elements that provide lumbar support also enable height and position adjustments, reducing the need for separate dedicated components for each adjustment function and thereby simplifying the overall device complexity.
3Stability of the object's composition
If the base is positioned high for stability, then the stability of the chair is improved, but the ease of operation and accessibility deteriorate
Solution Approach 1:
The base design transitions from a conventional high-positioned stable base to a low-profile base that achieves stability through a different dimensional approach. The five-arm base structure distributes weight and provides stability through its extended arm configuration rather than height, allowing the arms to be positioned low while maintaining chair stability and improving accessibility.
Solution Approach 2:
The five-arm base employs an asymmetric configuration where the arms are positioned at different angles and lengths relative to the central column. This asymmetric arrangement optimizes both stability and accessibility by positioning arms to clear obstacles while maintaining a low profile, rather than using a symmetric high-base design.
Data Source
AI summary
The object of the invention is a convertible, dual function chair for sitting and kneeling, which gives the possibility of changing the position and relieving the spinal column during a prolonged work in a sitting position.The dual function chair for sitting and kneeling is equipped with a movable backrest and headrest support, shaped in the lower part in such a way that its displacement changes the size of the chair simultaneously vertically and horizontally. It is also equipped with a sliding-rotating-returning or a sliding-returning backrest device, which makes it follow the user's back and support it accurately at every angle of inclination of the backrest when tilting the backrest. It is also equipped with a headrest connected to the headrest arm through a rotary-sliding mechanism, which rotationally connects with the backrest support, and has a specially shaped five-star base, in which the arms, apart from the fragment above the wheels, are maximally flattened and located as low as possible above the ground.