This technology is a subway door safety system that attaches first and second conductive rubber strips to the edges of both door panels. It detects changes in resistance based on the contact area between the two rubber strips as the doors close to determine if the doors have closed properly or if an object is caught between them.
Existing subway door sensors are installed only at the top and signal the train to depart if the gap is 7.5mm or less, failing to detect thinner objects. Because there are no sensors at the bottom, the system often misses cases where items like shoes or stroller wheels are caught while the top closes, leading to frequent accidents involving trapped limbs, bags, or clothing.
This technology uses the minimum resistance value measured when the two rubber strips make full contact as a baseline. If the detected resistance is higher, it identifies an obstruction or an open door; if it matches, it confirms a normal closure. This allows the system to detect issues along the entire length of the door, regardless of the object's position or thickness. If an abnormal closure is detected, the mechanism immediately reopens the doors and triggers an audible or visual alarm. Applicable to subway doors, platform screen doors, elevators, and automatic bus doors, it can detect thin items like clothing or stroller wheels that existing sensors miss, ensuring doors reopen before departure.
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