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It is no fun sitting on the commode with someone insisting on knocking at the door. This design makes the “in use” sign part of the door, so the action of whether to move on to the next door can become decisive. When a person closes the stall door and “locks” it, a section in bright red color springs out of the door and locks into the stall frame. When the door is opened from inside, the section retracts, leaving the door half open. Since there is no handle knob on the outside of the door, it cannot be opened or closed by someone outside of the stall.
Ming Chi University of Technology