Patent ID: 8672331

Claim:
A tool holder for a power tool, in particular for a chisel hammer and/or rotary hammer, comprising: a tool receptacle receiving a cylindrical shaft of a tool insert along a tool axis, which cylindrical shaft is introduced through an insertion opening of the tool receptacle, a circumferential surface of the cylindrical shaft provided with at least two diametrically opposed detent indentations; and a locking device that has at least two locking elements, at least one blocking element, and at least one restoring element, wherein upon insertion of the cylindrical shaft of the tool insert into the tool receptacle, the restoring element exerts different forces on the locking elements of the locking device, wherein the restoring element has a contact shoulder, for contact with the blocking element, and an expanded shoulder region, for creating two unequal deflection chambers for the locking elements, wherein the expanded shoulder region is defined by an asymmetrically shaped continuous conical surface having a continuously changing conical angle about the tool axis.