Backpack Chair Backrest Structure With Fold-Around Auxiliary Leg
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Solution Overview
Problem
Folding chairs with adjustable backrests that can lay flat are hindered by auxiliary legs, which prevent the addition of pockets for a backpack design, forcing manufacturers to choose between stability and functionality.
Innovation Solution
A folding backpack chair design that incorporates an auxiliary leg that can fold against the backrest, allowing it to lay flat while also featuring rear pockets and shoulder straps for carrying, with the leg folding around the pocket to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an auxiliary leg is added to support the backrest in a horizontal position, then the chair stability is improved, but the ability to add pockets on the rear of the backrest is worsened
Solution Approach 1:
The auxiliary leg is designed to be movable between an extended position (when the backrest is horizontal) and a retracted position (when the backrest is vertical). This dynamic adjustment allows the leg to clear the pocket area on the rear of the backrest, enabling both chair stability and backpack functionality to coexist without permanent interference.
2Adaptability or versatility
If an auxiliary leg is added to enable the chair to lay flat, then the chair can function as a lounge chair, but the chair complexity increases
Solution Approach 1:
The auxiliary leg serves multiple functions: it provides structural support when the backrest is horizontal, acts as a structural component of the chair framework, and when retracted, allows the chair to function as a backpack. This multi-functionality reduces the need for separate components and minimizes overall structural complexity.
3Stability of the object's composition
If the auxiliary leg is made fixed to ensure stability, then the chair stability is improved, but the ease of manufacture is worsened due to additional structural constraints
Solution Approach 1:
The auxiliary leg is designed as a movable component that can be positioned as needed rather than a fixed structural element. This dynamic design simplifies manufacturing by allowing standard connection methods (hinges, pivots, or sliding mechanisms) rather than requiring complex fixed attachments, while still providing stable support when extended.
Data Source
AI summary
A chair assembly that contains both an auxiliary leg and at least one rear pocket that extend from the rear of the backrest. The chair assembly has a seat and a leg framework that supports the seat at a predetermined elevation. A backrest is provided that is adjustable between a generally vertical position and a generally horizontal position. At least a first pocket extends outwardly from the rear surface of the backrest. The auxiliary leg is connected to the rear of the backrest above the first pocket. The auxiliary leg can be folded against the backrest or rotated to a position where it extends away from the backrest. When in its folded position, the auxiliary leg extends around the periphery of the first pocket. In this manner, the auxiliary leg and the first pocket do not physically interfere with each other.