Using the idea of ancient door bolts and modern craftsmanship to make bolted water cups.
Using the craft of ancient door bolt to make a water cup
The water cup is cylindrical as a whole, which is controlled by the pull-loop switch to pull down. The spring in the cup jugs the bottle cap, and the pull-loop switch has a certain range of motion.
The pull ring goes up, and the mechanism in the cup locks the bottle cap.
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