Sign up for an Award
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
Sometimes we might doubt whether we have locked the door soon after we leave home. So we have to go back to check it. But it turns out to be locked.
This memory key can help you solve this problem easily. Its petiole and dentes can rotate relatively for 90 degrees. When you lock the door, the key rotate clockwise and the petiole rotate 90 CW against dentes too. The semicircle on the side of the petiole is aligned with the square pattern on the side of the dentes. Meanwhile , two magnets keep the key in this state. After you leave your house, if you see that the semicircle and the square pattern is aligned, you know the door is locked!