Treadmill Folding Mechanism with Handle-Based Column Locking

The folding mechanism is divided into independent functional components: the positioning rod for structural support, the handle for operation, and the limit notch mechanism for locking. Each component performs a specific function, allowing the system to achieve stable folding without overall complexity. The positioning rod segments the folding path into discrete positions (folded and unfolded states), simplifying the transition while maintaining stability.

The mechanism utilizes the user's own action (turning the handle) to automatically engage the limit notch with the positioning rod, achieving self-locking without additional actuators or complex control systems. The handle itself serves both as an operational lever and as the locking mechanism through its integration with the limit notch, eliminating the need for separate locking components and reducing overall device complexity.

The limit notch is pre-positioned on the handle at a specific location that corresponds to the folded state. As the handle is turned during the folding operation, the limit notch automatically engages with the positioning rod before the folding is complete, ensuring reliable locking is established in advance of full folding. This preliminary engagement prevents accidental unfolding or instability during use.

The limit notch acts as an intermediary element between the handle and the positioning rod, mediating the locking function. Instead of direct mechanical connection that would be complex, the limit notch serves as a simple geometric feature that interfaces with the positioning rod to create the locked state. This intermediary approach maintains reliability through positive mechanical engagement while keeping the overall mechanism simple.