Patent ID: 7597155

Claim:
A system, comprising: a tool holder for holding at least a tool in the group consisting of a rotary hammer bit and a chisel bit: an adapter that is distinct from the tool and that is insertable into the tool holder, wherein the tool holder comprises: a tool fitting body with a receiving region for receiving said tool, the receiving region forming a bearing surface for supporting the tool such that the tool may be inserted into the tool fitting body in an insert direction parallel to the bearing surface; centering means configured to center the adapter, said centering means having at least one centering surface that is separate from the bearing surface; and wherein the adapter comprises: an inserting region that is provided to be inserted into the tool holder, wherein the inserting region abuts on said bearing surface of the tool holder when the adapter is mounted in the tool holder; a receiving region for receiving a chuck for a drill bit; and centering means configured for centering the adapter with respect to the tool holder, the centering means having at least a centering surface being provided to correspond with said centering surface of the tool holder.