Tool Box Assembly Groove Protrusion Stacking Mechanism

The patent applies universality by designing a tool box assembly where multiple tool boxes of different sizes can be stacked and fixed together using a standardized connection mechanism. The grooves and protrusions with engaging portions create a universal interface that works across different box sizes, allowing one type of assembly system to accommodate various tool storage needs without requiring separate carrying solutions for each box size.

The patent implements the nesting principle by allowing smaller tool boxes to be stacked inside or on top of larger tool boxes through the groove-protrusion connection system. This creates a nested configuration where multiple boxes occupy reduced space when stacked, improving storage and transportation efficiency while maintaining the ability to access tools in any box.

The connection mechanism is segmented into distinct functional elements: grooves defined on the tool boxes, protrusions corresponding to the grooves, and engaging portions on the peripheral walls. This segmentation allows each component to be manufactured separately using standard molding techniques, reducing overall manufacturing complexity while achieving stable assembly through the coordinated interaction of these segmented parts.

The engaging portions on the peripheral walls of the protrusions automatically engage with corresponding features when the boxes are stacked, providing self-alignment and self-locking functionality. This self-service mechanism reduces the need for complex fastening operations or additional hardware, simplifying both manufacturing and assembly while ensuring stable fixation of the stacked boxes.