Hook-Assembled Chair Back and Cushion for Fast Reusable Assembly
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Solution Overview
Problem
Existing chair assembly methods using studs and screws are complex, time-consuming, and difficult to disassemble, making it hard to reuse components.
Innovation Solution
A chair design featuring a frame body with penetrating holes and a back pad with hooks for secure assembly by insertion or buckling, allowing rapid and easy assembly and disassembly, and enabling combination with table plates or handles through a combining device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If studs and screws are used to assemble chair components, then the connection strength is improved, but the assembly complexity and time consumption increase
Solution Approach 1:
The connection system is segmented into separate functional elements: penetrating holes in the frame body and hooks on the back pad. This segmentation allows each component to have a simple, dedicated function - the hole provides a passage and the hook provides the fastening action - eliminating the need for complex threaded structures while maintaining connection strength.
Solution Approach 2:
Instead of using protruding studs that must be inserted into holes and secured with nuts or additional fasteners, the design inverts the approach by having penetrating holes that receive hooks. The hook engages from the inside, reversing the traditional insertion direction and eliminating the need for threaded fasteners, thereby simplifying the assembly process.
2Reliability
If studs and screws are used to assemble chair components, then the connection reliability is improved, but the disassembly difficulty and time consumption increase
Solution Approach 1:
The connection system transitions from a static, permanent fastening (screws requiring tools and force to remove) to a dynamic, reversible mechanism. The hook can be easily inserted through the penetrating hole and engaged with the back rod, and just as easily disengaged by pulling the hook out, allowing rapid assembly and disassembly while maintaining reliable connection during use.
Solution Approach 2:
The hook-back rod connection system is self-servicing in that it requires no additional tools, fasteners, or complex operations for either assembly or disassembly. The user simply needs to insert the hook through the hole and engage it with the back rod for assembly, and pull it out for disassembly, making the system self-contained and tool-free.
3Strength
If threaded holes and protruded studs are formed in components, then the assembly strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The complex threaded hole formation process is extracted and replaced with simple penetrating holes. Instead of machining threaded cavities into the frame body and creating corresponding threaded studs, the design uses straightforward through-holes that can be easily punched or drilled, significantly simplifying the manufacturing process while maintaining adequate connection strength through the hook engagement mechanism.
Data Source
AI summary
An easy-assembled chair comprises a frame body having a seat frame; a cushion; the backside of the cushion having at least one recess; at least one through hole being formed in the recess; a back pad; a lower edge of the back pad being formed with at least one protruding sheet; at least one hook being installed at the protruding sheet; a combining device for combined handles or a table plate to legs of the seat frame of the frame body. The hook of the protruding sheet passes through the through hole of the recess of the cushion to hook the back rod of the seat frame. The frame body has supporting rods; and a rear side of the seat frame has a back rod; the hooks of the back pad can hook the back rod so as to secure the back pad to the frame body.