Method of detaching a driver bit from a screwdriver and a stop ring

Abstract

To obviate the necessity of a plier or other tool for extracting a driver bit from a screwdriver, and prevent an adjustment sleeve detached from the screwdriver from being lost. The stop ring has an oval dusting opening having a width wider than the distance between the opposite sides of the hexagonal cross section of the driver bit and narrower than the diagonal length of the cross section. After detaching the adjustment sleeve from the screwdriver, the parallel sizes of the oval dusting opening of the stop ring are aligned with the opposite sides of the driver bit, and the stop ring is moved toward the driver bit, until a peripheral groove portion of the driver bit reaches the edge surrounding the dusting opening. By changing the relative angle between the adjustment sleeve and the driver bit, the diagonal part of the driver bit is caught by the edge surrounding the oval dusting opening. Subsequently, by pulling the adjustment sleeve with the stop ring attached thereto, the driver bit can be extracted from the screwdriver against the urging force of a steel ball provided on the screwdriver.