Patent ID: 7535197

Claim:
An electrical tool assembly comprising: an electrical tool comprising a housing having an insertion portion with an opening in communication between the inside and the outside of said housing, a power drive mounted inside said housing, a tool-holding member mounted in said housing and coupled to said power drive, a rechargeable battery mounted inside said housing and electrically coupled to said power drive, and a charging terminal mounted in said housing, the charging terminal of said electrical tool having a base with an insertion hole aimed at the opening at said insertion portion, a substantially cylinder-shaped first contact coaxially suspended in said insertion hole and electrically coupled to said rechargeable battery, and a second contact mounted on a periphery wall of said insertion hole and spaced around the first contact of the charging terminal of said electrical tool and electrically coupled to said rechargeable battery; and a charger for receiving said electrical tool to charge said rechargeable battery, said charger comprising a deck having a receptacle for receiving said insertion portion of said housing with a bottom through hole in communication with an inside space of said deck, a charging circuit board mounted inside said deck and provided with a charging circuit for charging said rechargeable battery, and a charging terminal, the charging terminal of said charger having an electrically insulative tubular base inserted through said bottom through hole into said receptacle for receiving the base of the charging terminal of said electrical tool upon insertion of the insertion portion of said housing of said electrical tool into said receptacle of said deck, a first contact mounted on an inside wall of said tubular base and electrically coupled to said charging circuit for the contact of the first contact of the charging terminal of said electrical tool upon insertion of the insertion portion of said housing of said electrical tool into said receptacle of said deck, and a second contact mounted on an outside wall of said tubular base and electrically coupled to said charging circuit for the contact of the second contact of the charging terminal of said electrical tool upon insertion of the insertion portion of said housing of said electrical tool into said receptacle of said deck.