A dual-mode system for inexpensively operating electrically powered double-insulated devices (12), such as hand-held power tools and appliances. The system includes a cordless battery pack (14) that supplies the power and current demands of the device (12) in a cordless mode or a non-isolated corded...http://www.google.com/patents/US6675912?utm_source=gb-gplus-sharePatent US6675912 - Dual-mode non-isolated corded system for transportable cordless power tools
