Air coupling locking device

A safety and security locking device in combination with a pneumatic brake air coupling having an air coupling opening for applying air pressure to release an air brake, said locking device comprising:

• a pair of first and second elongate arms pivotally joined at a pivot axis between the ends of the respective arms for pivoting motion of the ends of the arms toward and away from each other between an open position and a clamping locking position;
• said first arm comprising at one end a flange means constructed and arranged for covering engagement over the air coupling opening and a locking guide projection within the perimeter of the flange means for guiding the flange means over the air coupling opening with the projection entering and extending into the opening and holding the locking device on the air coupling, said second arm comprising at the same end a brace means for clamping engagement with the air coupling on the opposite side from the opening in cooperation with the flange means holding the locking guide projection inside the air coupling opening and the flange means covering over the air coupling opening;
• said first and second arms each comprising at the opposite end from the cooperating flange means and brace means at least one locking hole, said holes being positioned and arranged to coincide in a closed locking position for inserting a lock through the coincident locking holes whereby the locking device is locked and held in the locking position with the flange means covering the air coupling opening and the locking guide projection preventing lateral withdrawal of the locking device thereby preventing access to the air coupling opening;
• at least one of said first and second arms at the flange means and base means end being offset at the end from a line through the pivot axis thereby spacing the flange means and base means from each other in the closed locking position in order to accommodate the dimensions of the air coupling;
• at least one of the first and second arms at the locking hole end comprising an extension substantially orthogonal to the arm formed with a plurality of locking holes through the extension along a first arc of the pivoting arms for coincidence with at least one locking hole of the other arm in a plurality of different locking positions.