Moon chair
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Solution Overview
Problem
The existing moon chair connecting seat structures are complex and costly to produce, leading to increased fatigue and higher production costs, while also compromising the comfort and stability of the chair during folding due to multiple degrees of freedom in the rest frame and supporting legs.
Innovation Solution
A simpler connecting seat structure using integral bent metal sheets for the first and second connecting seats, with pin holes for connecting pins, allowing for rotatable connections and reduced production costs, and additional U-shape bends for enhanced torque stability and comfort by increasing contact area with supporting legs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex multi-part connecting seat structures are used to achieve rotatable connection of multiple degrees of freedom, then the folding functionality and ergonomic design are enabled, but the device complexity and production cost increase significantly
Solution Approach 1:
The patent combines multiple connecting seats into a single integral bent metal sheet structure. Instead of using separate components for each connecting seat, the invention integrates them into one piece through bending and folding operations on a single metal sheet, thereby reducing the number of parts while maintaining the required folding functionality and multiple degrees of freedom.
Solution Approach 2:
The integral bent metal sheet is designed with specific fold lines and bending sections that create segmented functional zones within the single structure. These internal segments enable different sections of the metal sheet to perform different functions (connecting to rest frame, connecting to supporting legs, providing rotational movement) while remaining part of one continuous structure.
2Adaptability or versatility
If multiple component parts are assembled to form connecting seats, then the required degrees of freedom for folding are achieved, but the manufacturing cost and assembly complexity increase
Solution Approach 1:
The invention changes the manufacturing approach from assembling multiple discrete components to forming a single structure through bending and folding operations. This parameter change in the manufacturing process (from assembly to forming) significantly reduces production cost while maintaining the required degrees of freedom through the geometric design of the bent metal sheet.
Solution Approach 2:
Multiple connecting seat components are merged into one integral bent metal sheet, eliminating the need for separate manufacturing and assembly operations for each component. This consolidation reduces both manufacturing cost and assembly complexity while preserving the functional requirements for folding and rotational movement.
3Ease of operation
If connecting pins are used for rotatable connection, then the folding movement is enabled, but the torque transfer stability is insufficient causing loose connections
Solution Approach 1:
The bent metal sheet structure incorporates dynamic elements such as folding sections and bending portions that allow controlled movement and rotation while maintaining structural integrity. The geometry of the bent sheet provides inherent mechanical stability that complements the connecting pins, ensuring stable torque transfer during folding operations.
Solution Approach 2:
The use of bent and curved sections in the metal sheet structure provides geometric stability and stress distribution that enhances torque transfer. The curved bending portions distribute mechanical loads more effectively compared to straight rigid connections, improving the reliability of the connecting joints while maintaining rotational freedom.
Data Source
AI summary
A moon chair includes front supporting legs, rear supporting legs and a rest frame connected onto the front and rear supporting legs. The rest frame is of the shape of a circular ring obliquely erected when the rest frame is unfolded. The front and rear supporting legs are connected with the rest frame through first and second connecting seats, respectively. Each of the first or second connecting seats comprises an integral bent metal sheet. The two ends of the metal sheet are respectively provided with pin holes for arranging connecting pins in a penetrating manner. The metal sheets on the first or second connecting seats are respectively and movably connected with the front or rear supporting legs and the rest frame through the connecting pins. One end of the metal sheet on a first connecting seat is bent to a U-shape to cover the corresponding front supporting leg.