US Patent 8387309 Automatic waterproof gate

A waterproof gate includes a door frame, two side rails mounted on two opposite sides of the door frame, a waterproof door movably mounted between the two side rails, at least one sealing gasket mounted on the waterproof door, and at least one waterproof strip mounted between the waterproof door and the door frame. Thus, when the water level exceeds a preset value, the waterproof door is moved down to press the ground tightly so that the waterproof door blocks the door frame so as to provide a waterproof effect to the door frame.