Patent ID: 6799480
Filing Date: 2004-10-05
Classification: B25B

Abstract:
A screwdriver assembly for rotationally driving a tool to thereby threadedly fasten a workpiece screw and having a torque measuring scale, comprising:a screwdriver handle having an elongated axis and a hollow interior along said axis and a recess in said handle, a helical spring disposed in said handle interior and extending axially therealong and having two ends with a first one of said spring ends disposed in said handle recess for rotation-connection with said handle, a connector supported on said handle for rotation of said handle relative to said connector which has a recess therein and a second end of said spring is disposed in said connector recess to have said second end of said spring non-rotationally connected to said connector, said spring two ends being axially movable in said recesses for accommodating extension and contraction of said spring and said handle and said connector each being arranged adjacent said ends of said spring for limiting axially movement of said spring, said connector being adapted to connect with an adapter for supporting a tool for tightening the workpiece screw, a torque scale connectable with said connector and being co-axially disposed relative to said axis, and a marker on said handle adjacent said scale and rotatable with said handle for indicating the amount of rotation of said handle relative to said scale upon tightening the screw.