Abstract: An improved hand-held screw driving tool is provided with a quick release nose sub-assembly, which can readily be attached to and detached from a main body of the tool. This capability allows the tool to be used in several different ways, by putting different nose sub-assemblies onto the main body of the tool. For example, one nose sub-assembly could drive a strip of collated screws, whereas a different nose sub-assembly could use single feed screws that are individually placed at a drive position of the nose sub-assembly. Another possible nose sub-assembly is a cutter or shears attachment that can be driven by the rotary motion of the tool's motor. Various sizes and types of fasteners can be driven by this tool.

Abstract: An improved hand-held fastener driving tool is provided with an adjustable torque limiting control. The tool is portable, and is electrically powered using either a battery pack or a power cord as a power source. The tool drives collated fasteners (e.g., screws) into solid objects. The motor current is measured to determine the amount of torque being applied to a screw by the motor and mechanical drive components. As the screw bottoms out, the motor torque increases to a point where it exceeds the user-adjusted torque limiting control. The motor is automatically turned off at that point, thereby preventing the screw from being stripped.