chair
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Solution Overview
Problem
Existing furniture assembly methods require tools or substantial body strength, and existing joints lack robustness to withstand complex loads, particularly in self-assembly furniture like chairs.
Innovation Solution
A chair design featuring interlocking joint arrangements made of male and female parts that can be assembled without tools, using dowels with radial rims and recesses with corresponding grooves, allowing for secure and robust connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical fastening means are used to join furniture parts, then the joint strength and robustness are improved, but the ease of assembly deteriorates as tools and substantial body strength are required
Solution Approach 1:
The joint arrangement enables self-service assembly through the interaction between male and female parts with dowels and recesses. The dowels automatically engage with the recesses when parts are brought together, eliminating the need for tools or substantial body strength while maintaining robust joint strength.
Solution Approach 2:
The male part with dowel is nested within the female part with recess, creating an interlocking joint arrangement. The dowel fits into the recess to form a secure connection that provides both ease of assembly and joint strength.
2Ease of operation
If simple joint arrangements are used for self-assembly furniture, then the ease of assembly is improved, but the robustness and ability to withstand complex loads deteriorates
Solution Approach 1:
The joint arrangement combines multiple elements (male part, female part, dowel, recess) into a composite structure that provides both ease of assembly and robustness. The combination of these elements creates a joint that can withstand complex loads while remaining simple to assemble.
Solution Approach 2:
The joint is segmented into distinct male and female parts with dowels and recesses, allowing for easy assembly while maintaining structural integrity. This segmentation enables the joint to handle complex loads through the distributed connection points.
3Reliability
If multiple male and female parts are used in joint arrangements, then the robustness and prevention of rotation are improved, but the device complexity increases
Solution Approach 1:
Multiple dowels are merged into a single male part and multiple recesses are integrated into a single female part. This combining approach maintains the robustness provided by multiple connection points while reducing the overall number of separate components, thereby simplifying the joint arrangement.
4Ease of operation
If furniture parts are designed for easy disassembly, then the ease of operation is improved, but the joint strength may deteriorate
Solution Approach 1:
The joint arrangement enables self-service both for assembly and disassembly. The same interlocking mechanism that provides strong joints during assembly also allows for easy disassembly by simply reversing the insertion motion, maintaining both strength and ease of operation.
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~1E
AI summary
The disclosure relates to a chair comprising a first and a second section (100A, 100B) mutually displaced from each other to form a gap (G) there between. A first cross-member (200A) is configured to connect with its first free end (201A) to the first section (100A) and with its second free end (201B) to the second section (100B), thereby bridging the gap (G). A first joint arrangement (500) is configured to attach the first free end (201A) to the first section (100A) and a second joint arrangement (600) is configured to attach the second free end (201B) to the second section (100A). Each of the first and second joint arrangements (500, 600) comprises a male part (520) in the form of a dowel (521) and a female part (537) in the form of a recess (531). The recess (531) has an elongated extension and a locking portion (533). The first cross-member (200A) is configured to be moved relative to the first and second sections (100A, 100B) such that the dowels (521) are moved along the elongated extension of the recesses (531) to the locking portions (533).