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You may have the experience that you opened the pillbox and wanted to spill two pills but spilled three or more than that, so you had no choice but returned the extra pills to the pillbox. It's obviously that the pills you returned to the pillbox are contaminated by your hand. How to solve the problem? My design introduced seam to decide the size and the shape of the hatch. Actually, the seam is designed according to the form and dimension of the pills. Then, if you want to take three pills, you just need to knock the box three times and three pills will come out. No more pills will come out to your palm.
Wuhan University of Technology