Chair Backrest Frame Integration for Tilt Rigidity and Simplicity
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Solution Overview
Problem
Existing chair designs with a rocking function either lack simplicity, versatility, or provide limited comfort due to constraints in backrest tilt angle and rigidity, often resulting in discomfort and disturbance to others when used in close proximity.
Innovation Solution
A chair design featuring a backrest separated from the seat, attached to an upper support frame with integrated left and right side portions that are continuously connected, allowing for tiltable rearward movement, with a pivoting fulcrum positioned higher than the seat to enhance comfort and prevent shirt rolling, and incorporating a double rocking system for increased tilt angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the backrest is connected to independently arranged left and right support members, then the structure is simple, but the rigidity of the chair is not high
Solution Approach 1:
The patent merges the left and right support members into a single integrated upper support frame that continuously connects the seat to the backrest. This unified structure eliminates the independence of left and right support members while maintaining structural simplicity, thereby achieving high rigidity without excessive complexity.
2Adaptability or versatility
If the rocking function is given to the backrest by utilizing the bending of the frame material, then the structure is simple, but the backrest swings easily which is a problem in versatility
Solution Approach 1:
The patent changes the structural parameters by providing a specific connecting portion between the upper support frame and backrest with controlled flexibility. This connecting portion is designed to allow rocking motion while maintaining stability, achieving versatility in rocking function without excessive swinging through precise parameter optimization.
3Ease of operation
If the backrest is connected to the support members at a lower position, then the space constraint is reduced, but the comfort for the user is limited and shirt rolling occurs
Solution Approach 1:
The patent extends the upper support frame horizontally at an elevated position, creating a rear portion that projects backward. This dimensional extension allows the backrest to be connected at a higher position that improves comfort and prevents shirt rolling, while the horizontal projection provides the necessary space for the connecting portion without increasing vertical height constraints.
4Adaptability or versatility
If the upper support frame is composed of a plurality of pieces to allow backward tilting, then the rocking function is achieved, but the user's demand for simplicity cannot be met and versatility is low
Solution Approach 1:
The patent combines multiple functional elements into a single integrated upper support frame structure. The frame continuously connects the seat to the backrest while incorporating the rocking mechanism within the unified structure, eliminating the need for multiple separate pieces and achieving both simplicity and versatility.
Data Source
AI summary
A chair includes, a seat, a backrest separated from the seat, and an upper support frame to which the backrest is attached at a position higher than the seat. In the chair, the upper support frame includes a left side portin and a right side portions both extending forward at left and right sides of the seated person and a rear portion that continuously and integrally connects the left side portion and the right side portion. The left side portion and the right side portion are connected to side support bodies arranged on left and right sides of the seat to be tiltable, and the backrest is connected to the upper support frame to be tiltable rearward.