I. Embedded
Embedded refers to a joining method where a block on one component slides into a groove of another component. The blocks are typically in a “7” shape, with the initial groove being the first groove and the groove where it slides in being the second groove. The width of the first groove is greater than the width of the block, while the second groove’s width matches the size of the block (Figure 3).
This allows the block to easily embed into the first groove and be secured in the second groove. This joining method is convenient for assembly and disassembly, requiring only sliding for installation and separation.
For instance, Wei Lu Sasaki invented a “Quick Connector for Assembling Furniture,” which discloses a quick connector suitable for assembling furniture, including a male and female connector. The male connector has at least one block, which is a “7” shaped block, and part of the block mounted on the male connector is the first segment of the block;
the other part is the second segment of the block. The female connector is equipped with a groove that cooperates with the block, which is also “7” shaped, where one part of the groove is the first segment and the internal deep groove is the second segment. The width of the first segment of the groove is greater than that of the first segment of the block, and the sizes of the second segments of both the groove and block match.
The blocks on the male connector and the grooves on the female connector can work together, allowing for quick and efficient assembly of the furniture, which is fast and of good quality [7].
Table 1 Analysis of Mortise-Free Tool Disassembly Structure
2 Advantages, Disadvantages, and Applicability Analysis
The advantage of this joining method lies in the simplicity of the assembly process, generally requiring only an embedding and sliding action, without the need for rotational movements or pre-positioning of products, making it quick and efficient in assembly.
Moreover, disassembly does not damage the assembled furniture. However, the downside is that it may become loose in the sliding direction and cannot self-lock in all directions. It is mainly used for furniture that requires quick assembly or temporary spaces.
II. Snap-Fit
Snap-fit utilizes the inherent flexibility of plastic (i.e., parts undergo elastic deformation when subjected to force and return to their original shape after being set) to achieve the joining of components [8].
There are various forms of snap-fit, including cantilever snap-fits (Figure 4), cylindrical, and spherical types. For example, Zhang Weimin invented a “Quick Installation Structure for Furniture,” which discloses a quick installation structure for furniture, including male and female connectors that snap together.
This utility model features male and female connectors installed in two pieces of furniture to be assembled, completing the assembly by snapping the connectors together, which is simple and convenient [9].
For instance, IKEA’s Kalek rack unit utilizes the snap-fit principle, setting slots on the columns to insert metal rods, with plastic cross supports connected at both ends of the panel. The ends of the cross supports have grooves that match the round rods, with the opening of the grooves being slightly smaller than the diameter of the rods. By pressing the cross supports, the plastic groove openings undergo elastic deformation, and upon reaching the correct position, they return to their original shape, achieving the joining of the two components.
2 Advantages, Disadvantages, and Applicability Analysis
The main advantage of snap-fit is that the structure can provide a reliable, high-quality fastening configuration, resulting in extremely high assembly efficiency, thus reducing assembly costs. Furthermore, the assembly process for the snap-fit is simple, generally requiring only an insertion action without additional operations or product positioning, making it quick and easy.
However, a disadvantage is that after repeated use, it may become loose or even break, and once broken, it can only be replaced and is difficult to repair. Snap-fit design requires accumulated experience in tolerance fitting.
This structure is mainly suitable for children’s furniture, lightweight furniture, and some temporary spaces.
■ Figure 1 Hook Self-Connection
■ Figure 2 Connecting Component Connection
■ Figure 3 Quick Connector
■ Figure 4 Snap-Fit Connection
■ Figure 5 Oppein’s Drawer Pull Rod
Article excerpt from: Research on Tool-Free Disassembly Furniture Structures Author: Chen Kunlun, Zhang Zhongfeng
Furniture Industry (jiajucy)
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