Patent ID: 8020876

Claim:
A tool comprising: a shank including a first end having an engaging hole formed therein and having a noncircular cross section, and including a plurality of orifices formed in said first end of said shank and communicating with said engaging hole of said shank, said shank including a stop attached to said shank, said shank including a noncircular anchoring member formed on said shank, and said stop including a noncircular opening formed therein for engaging with said noncircular anchoring member of said shank and for anchoring said stop to said shank and for preventing said stop from being rotated relative to said shank, a tool member including a first end engageable into said engaging hole of said shank, a plurality of detents slidably received in said orifices of said shank respectively and engageable into said engaging hole of said shank and selectively engageable with said tool member, a control ferrule rotatably engaged onto said first end of said shank, and including a plurality of notches formed in an inner peripheral shoulder thereof, and each notch of said control ferrule including a deeper portion for selectively receiving said detents and for allowing said detents to be selectively disengaged from said tool member and for allowing said tool member to be selectively disengaged from said shank, and each notch of said control ferrule including a shallower portion for selectively engaging with said detents and for forcing and actuating said detents to selectively engage with said tool member in order to detachably couple said tool member to said shank, said stop of said shank being engaged with said control ferrule for anchoring said control ferrule to said shank and for preventing said control ferrule from being rotated relative to said shank, and means for biasing and rotating said control ferrule relative to said shank to engage said shallower portions of said notches of said control ferrule with said detents and to actuate said detents to engage with said tool member so as to detachably couple said tool member to said shank.