FASTENER DRIVING TOOL WITH USER-ADJUSTABLE TORQUE LIMITING CONTROL

摘要

An improved hand-held fastener driving tool (10) is provided with an adjustable torque limiting control. The tool is portable, and is electrically powered using either a battery pack (48) or a power cord as a power source. The tool drives collated fasteners (60) (e.g., screws) (64) into solid objects. The motor current is measured to determine the amount of torque being applied to a screw (64) by the motor (146) and mechanical drive components. As the screw (64) bottoms out, the motor torque increases to a point where it exceeds the user-adjusted torque limiting control. The motor (146) is automatically turned off at that point, thereby preventing the screw (64) form being stripped.