Patent ID: 7431342

Claim:
A connection for fastening a tool or a tool adapter to an extension device, the connection comprising: a threaded stud; a threaded bush; at least one lug on one of said threaded stud and said threaded bush; and a locking sleeve on the other one of said threaded stud and said threaded bush, said 1 ockinig sleeve having at least one recess corresponding to said at least one lug, said locking sleeve being axially displaceable against the force of a spring contained inside said locking sleeve but being rotationally fixed by anti-rotation means contained inside said locking sleeve, wherein said at least one lug snaps into place in said at least one recess in a locking manner only when said threaded stud is screwed into a tightened position in said threaded bush, and wherein said at least one lug is retracted from said at least one recess when said locking sleeve is displaced axially away from said lug.