Apparatus for adjusting torque output of power tool

An adjusting apparatus, which is installed to a transmission base with an axle therein and at least a gear block on an end thereof of a power tool, comprising:

• a barrel having a closed end, a neck portion on the closed end, a through hole communicated with the neck portion and a plurality of bores on the closed end;
• an adjusting assembly connected to the neck portion of the barrel having an outer tube and an inner tube, wherein the inner tube is moved relative to the outer tube;
• a driving member received in the barrel having a plurality of posts inserted into the bores of the barrel respectively and extruded out of the barrel to be rested on the adjusting assembly;
• a washer assembly having a bearing received in the barrel behind the driving member;
• a movable member having an annular gear portion on an interior side adjacent to an end thereof and two blocks on an exterior side adjacent to an end opposite to the end with the gear portion, wherein the end with the gear portion of the movable member is inserted into the bearing of the washer assembly;
• a transmission shaft having a clipping hole at an end thereof and an annular gear portion on an exterior side adjacent to an end opposite to the end with the clipping hole, wherein the end with the gear portion of the transmission shaft is inserted into the barrel via the neck portion and the gear portion of the transmission shaft is meshed with the gear portion of the movable member, and the axle of the transmission is connected to an end of the gear portion, and
• a spring received in the barrel behind the washer assembly to urge the driving member and the washer assembly attached on a front end of the barrel.