Abstract: A power-driven screwdriver for use with a motor-driven tool for driving a strip of screws one at a time into a workpiece and having an outer guide frame in which a slide block and a slide plate are slidably mounted. A screw indexing lever is angularly movably mounted on the slide block and has a pin received in a first cam slot having an oblique portion and defined in the outer guide frame and a second cam slot defined in the slide plate. When the motor-driven tool is pushed toward a workpiece, the slide block and the slide plate are slid into the outer guide frame, allowing a screwdriver bit to engage and drive a screw into the workpiece. After the screw has been driven, the motor-driven tool is retracted away from the workpiece, whereupon the slide block and the slide plate are forced to slide out of the outer guide frame under the bias of a spring around the screwdriver bit.

Abstract: A socket having a socket body which is accurate in position when in use. The body is provided with an internal blind bore having an open end and a closed end. The blind bore defines or has a portion defined by inner surfaces which converge in a direction toward the open end of the blind bore and diverge toward the closed end. This bore portion is spaced axially from the open end. Within this portion of the bore is disposed a locking element made of at least two segments that have an axial extent less than the length of the above-mentioned portion. The segments have outer side surfaces which are complementary with the converging inner surfaces of the portion of the blind bore. They are each provided with a thread and jointly define a bore of lesser diameter than the open end and accordingly of lesser diameter than an anchor bolt insertable axially into the socket body.