Abstract: A locking device for a quick release coupling includes a coupling, a lever and a sleeve containing an arcuate groove therein. The sleeve is attached to the coupling and the lever is pivotally mounted on the coupling. The coupling includes at least two pairs of supports with each pair containing a groove therein to receive the lever. A pivot pin penetrates the lever to pivotally mount the lever on the support and a locking pin is attached to the pair of supports and received in the groove of the support. The lever includes a cam formed on one end to abut the arcuate groove of the sleeve and a recess formed in the other end to receive a linkage. The recess of the lever contains an opening to allow the linkage to extend through the lever and has an indentation to receive the locking pin when the lever is pulled down flush to the coupling. A torsion spring is pivotally mounted on the lever by the pin and has a first end abutting the first end of the linkage and a second end abutting the lever.