Hand-held type electrically powered fastener tool with on-board controller
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United States of America Patent
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May 18, 2004
Grant Date -
Jul 17, 2003
app pub date -
Dec 17, 2002
filing date -
Dec 18, 2001
priority date (Note) -
Expired
status (Latency Note)
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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.
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