Rack Rail Assembly Using T-Shaped Holes for Tool-Free Securing
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Solution Overview
Problem
Existing assembly kits for building racks are cumbersome to assemble and disassemble, and require tools to secure rails properly, limiting flexibility and ease of use.
Innovation Solution
The use of T-shaped holes in longitudinal members with breakouts and U-shaped folded edges on rails allows for tool-free insertion and secure attachment of rails, enabling simple assembly and disassembly without the need for tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional holes and simple insertion methods are used, then assembly is simple, but the rails are not secured sufficiently
Solution Approach 1:
The hole in the longitudinal member is designed with an asymmetric T-shaped cross-section rather than a symmetric circular or square hole. The T-shape includes a wider first section and a narrower second section extending perpendicular to the first section, creating an asymmetric geometry that provides both easy insertion and secure retention of the rail element.
Solution Approach 2:
The hole's cross-sectional parameters are specifically designed with a T-shaped geometry where the width and depth dimensions vary along the insertion path. The first section has dimensions that facilitate easy insertion, while the second section has different dimensions that provide secure retention, achieving both simplicity and reliability through parameter optimization.
2Reliability
If tools are used to secure rails, then the rails are secured sufficiently, but assembly becomes cumbersome
Solution Approach 1:
The T-shaped hole geometry enables the rail element to secure itself automatically during insertion without requiring external tools. The asymmetric T-shape creates a self-locking effect where the rail element's positioning features engage with the hole's geometry to provide secure retention purely through the insertion motion itself.
Solution Approach 2:
The invention replaces complex mechanical fastening systems (screws, bolts, clips, or other tool-based securing mechanisms) with a simplified geometric interlocking system. The T-shaped hole geometry alone provides both insertion guidance and secure retention, eliminating the need for additional mechanical fastening components and tools.
3Reliability
If rails are made longer for better coverage, then securing is improved, but insertion becomes more difficult
Solution Approach 1:
The hole is designed with locally differentiated geometry where the first section has dimensions optimized for easy insertion and the second section has dimensions optimized for secure retention. This local quality variation along the hole's length allows the rail element to be inserted easily while still achieving reliable securing.
Solution Approach 2:
The hole is segmented into two distinct functional sections: a first section for easy insertion and a second section for secure retention. This segmentation allows each section to be optimized for its specific function, with the transition between sections providing both insertion ease and securing reliability.
Data Source
AI summary
An assembly kit for building a rack includes a plurality of longitudinal members to be arranged vertically, a plurality of cross members to be arranged horizontally, a plurality of node elements that connect the longitudinal members and cross members to each other, and a plurality of rails that accommodate rack bottoms, drawers, and the like. The longitudinal members are provided with holes used to hook in the rails on first lateral surfaces of the longitudinal members facing each other, wherein the holes are T-shaped and include breakouts adjacent to the first lateral surfaces. The rails are longer than the open distance of a front longitudinal member from a rear longitudinal member by the depth of the breakouts and are provided with U-shaped folded edges. The width of the vertically extending section of the T-shaped hole corresponds to the length of the free leg of the U-shaped folded edge.