Patent ID: 6860178

Claim:
An extension apparatus for connecting a tool with a tool bit, the extension apparatus including a driving element with a first end for engagement with the tool and a second end for engagement with the tool bit; a telescopic element inserted in the driving element; a magnet attached to the telescopic element; a barrel movably mounted on the driving element for receiving a fastener to be driven by the tool bit, with the barrel having a first end and a second end, with an annular stop groove defined in an external side of the driving element adjacent the second end of the driving element; and a stop ring located in the annular stop groove of the driving element, with an annular stop groove defined in an internal side of the barrel between the first and second ends, with the annular stop groove of the barrel including an annular shoulder and an annular slope, with the annular shoulder located intermediate the annular slope and the first end of the barrel, with the annular shoulder abutting with the stop ring for keeping the barrel on the driving element, the annular slope having increasing spacing from the internal side in a direction toward the first end of the barrel facilitating removal of the stop ring from the annular stop groove formed in the barrel when moving the barrel toward the first end of the driving element.