a closure locking device for the opening of a self - service device , in particular an automatic teller machine includes a locking flap , the outside of which is indented . the locking flap , pivotable about an axis , is positioned behind a projecting upper wall panel and in front of a recessed wall panel . a gap is created when the locking flap is pivoted , and as the flap opens the width of the gap increases , so that any ice formed is broken up or jammed objects are released . a self - locking latch and actuator for the locking flap uses an actuating lever which is pivotable about an axis . the actuating lever includes a shaped guide slot which is engaged by the actuator . in a first part of the guide slot , no displacement work is performed by the actuator , whereas in a second part , which is positioned at an angle to the first part , displacement work is performed to move the lever and locking flap .