Patent ID: 7036403

Claim:
In an articulated wrench having: a box end, formed with a cavity thereon for receiving a ratchet ring, having an end formed with at least one box knuckle, the box knuckle being formed on a side thereof with an indent and a through hole penetrating the box knuckle sideway; and a handle, having an end formed with at least one handle knuckle accommodating the box knuckle of the box end, each handle knuckle being formed with a though hole penetrating the handle knuckle sideway; the improvements comprising a fastening device, inserted through the through holes of the box end and the handle, having a head and a shank, wherein the head gradually expands outwards from the shank to form a flared angle having a tapering angle less than 45°; and a flexed spring disc, provided in the indent of the box end and flexed along a diameter thereof to form a curvature.