Abstract: A locking device to fit over a tractor trailer or container carrier air hose coupling consists of a rectangular cage of cut tubular steel with perpendicular welded flange and adjacent hole into which fits an angle flange with welded pin. Alternatively the locking device with semicircular flanges can be fabricated from sheet steel in a continuous bending, stamping, welding and laser drilling operation. A high impact strength plastic is required when the locking device is produced by injection molding. In use a flanged cage is placed over an air hose coupling with the hole directly over the air hole, and a pin or tongue insert is inserted while the hasp of the padlock passes through matching hasp holes. The locking device can be connected and color coded and used for an inventory control system.

Abstract: A locking device to fit over a tractor trailer or container carrier glad hand air coupling consists of a rectangular cage of cut structural steel with a drilled pin hole and a welded perpendicular flange with a hasp hole as one piece and an angle flange with a hasp hole and plug welded pin as a second piece. In use the flanged cage is placed over the air coupling with the pin hole over the air hole and the pin passed through the pin hole into the air hole and the hasp of a padlock passed through the hasp holes and locked to secure the air coupling. The locking device is fabricated from structural steel and angle irons using conventional cutting, drilling and welding techniques.