Patent ID: 6738685
Filing Date: 2004-05-18
Classification: B25B,H02K,Y10T

Abstract:
A system comprising:an electrical power source having live, neutral, and earth ground lines, and a hand-held type electrically powered fastener tool for performing a fastening job wherein torque is applied to a fastener using electrical power supplied from the electrical power source, the tool comprising: a housing constructed and arranged to be manually carried by a user; an electrically-powered motor having (a) an electroconductive outer housing electrically coupled to the earth ground line of the electrical power source, (b) a stator received in the outer housing, and (c) a rotor received in the outer housing and rotatable relative to the stator, the motor being electrically coupled to the live and neutral lines of the electrical power source and operable to convert electrical power from the electrical power source into rotation of the rotor; a fastener engaging member carried on the housing, the fastener engaging member being operatively connected to the rotor of the motor for rotation therewith and being engageable with the fastener in torque transmitting relation to enable the fastening job to be performed by engaging the fastener engaging member with the fastener and supplying electrical power to the motor to affect rotation of both the rotor and the fastener engaging member to thereby apply torque to the fastener; an on-board controller carried on the housing and operable in accordance with a logic scheme, the controller being adapted to monitor the fastening job and perform predetermined operations in accordance with the logic scheme based on the monitoring of the fastening job; and a shield extending axially between the stator and the electroconductive outer housing, the shield comprising: (a) an electroconductive element encircling the stator and electrically coupled to the neutral line of the electrical power source, (b) a first insulation layer encircling the stator between the stator and the electroconductive element so as to insulate the electroconductive element from the stator, and (c) a second insulation layer encircling the electroconductive element between the electroconductive element and the electroconductive outer housing so as to insulate the electroconductive outer housing from the electroconductive element.