Chair Frame with Linkage-Driven Backrest for Larger Zero-Gravity Angle
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Solution Overview
Problem
Existing zero gravity chairs have limited backrest opening angles, resulting in low comfort.
Innovation Solution
A chair frame design that includes a waist support assembly and footstool assembly, with a transmission mechanism allowing the backrest to unfold to a larger angle, enhancing the zero gravity effect and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the backrest opening angle is increased to achieve better zero gravity effect, then comfort is improved, but the structural complexity increases
Solution Approach 1:
The chair frame is divided into multiple independent assemblies: seat cushion assembly, backrest assembly, waist support assembly, and footstool assembly. Each assembly can be independently adjusted, allowing the backrest opening angle to be increased to improve comfort while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The chair frame employs dynamic adjustment mechanisms with multiple pivot connections and transmission assemblies that allow the backrest and waist support to move to different angles. This dynamic capability enables the system to achieve larger backrest opening angles for better zero gravity effect while using standardized mechanical components to control structural complexity.
2Adaptability or versatility
If a transmission assembly with multiple support rods is used to enable larger backrest opening angle, then the zero gravity effect is improved, but the device complexity increases
Solution Approach 1:
The transmission assembly uses multiple support rods (first, second, and third support rods) that serve multiple functions: they provide structural support, enable angular adjustment, and transmit mechanical forces. This multi-functionality allows the system to achieve adaptable backrest opening angles while avoiding the need for separate mechanisms for each function, thereby controlling device complexity.
Solution Approach 2:
The transmission assembly acts as an intermediary mechanism between the footstool assembly and the backrest assembly. It includes pivot connections and support rods that mediate the motion transmission, allowing the footstool's movement to be converted into coordinated backrest and waist support adjustments. This intermediary mechanism enables versatile angular adjustment while using standardized mechanical components to manage complexity.
Data Source
AI summary
Provided are a chair frame and a chair. The chair frame supports a human waist and back by using a waist support assembly and supports human legs and feet by using a footstool assembly. Meanwhile, when the waist support assembly is unfolded, driven by a second support rod, a second end of a first support rod can swing toward the footstool assembly with a junction between a first end of the first support rod and the second support rod as a rotation center to increase an included angle between a waist support bracket and a seat cushion bracket, that is, increasing an unfolded angle of a backrest and achieving the zero gravity effect. The chair can improve the chair comfort by applying the preceding chair frame.