Patent ID: 7661724

Claim:
A quick coupling, comprising: a male element having a circumferential slot extending around an axis, a female element for threaded connection to the male element, the female element having an inner tubular body and an outer tubular body bounding an annular chamber with the inner tubular body, a bearing provided in the annular chamber for reducing friction between the inner tubular body and the outer tubular body, the outer tubular body having, at a front portion thereof, a plurality of circumferentially arrnged holes for receiving a corresponding plurality of radially movable balls, the balls being received in the circumferential slot when the female element is threadedly connected to the male element, and a ring nut mounted for axial movement on the outer tubular body, the ring nut having a circumferential enlarged portion and a spring biased against the outer tubular body, the circumferential enlarged portion radially locking the balls in the circumferential slot when the female element is threadedly connected to the male element.