US Patent:
20030131462, Jul 17, 2003
Inventors:
William Kimmel - West St. Paul MN, US
Jeffrey Aranowski - Sterling Heights MI, US
Zuher Khalaf - Troy MI, US
Leonard Demchak - Streetsboro OH, US
International Classification:
B23Q017/00
Abstract:
An aspect of the invention provides a hand-held type fastener tool for performing a fastening job using electrical power supplied from an electrical power source. The tool comprises an electrically-powered motor, having an electroconductive outer housing adapted to electrically couple to the earth ground line of the electrical power source, a stator, and a rotor. The motor electrically couples to the live and neutral lines of the electrical power source. An on-board controller is adapted to monitor the fastening job and perform predetermined operations in accordance with the logic scheme based on the monitoring of the fastening job. The tool further comprises a shield comprising: (a) an electroconductive element encircling the stator and adapted to electrically couple to the neutral line of the power source, (b) a first insulation layer encircling the stator between the stator and the electroconductive element, and (c) a second insulation layer encircling the electroconductive element between the electroconductive element and the electroconductive housing.