Patent ID: 7520704

Claim:
A tool assembly, comprising: a tool including a head to be approached to a work-piece, a male spigot extended from a rear end of the head and a flange formed at a border portion between the head and the male spigot and having a ring shaped flat rear surface; and a coupling member consisting of a first section having a cavity formed on a central portion of a front side thereof for receiving the male spigot and a second section formed at a rear side of the first section and connected to a driving means, wherein the male spigot has a plurality of tapered surfaces, each formed on a side thereof, a plurality of through holes, each having a longitudinal axis that is perpendicular to a respective one of the tapered surfaces, are communicated with the cavity, are each disposed in an angularly spaced fashion about a circumference of the first section of the coupling member, and ends of a plurality of coupling screws, each coupled with a respective one of the through holes, are capable of pressurizing the tapered surfaces of the male spigot received in the cavity.