Slipping torque changing apparatus for impact tool

A slipping torque changing apparatus for an impact tool comprising:

• a driving source for generating a rotational motion:
• a motion converting mechanism portion, connected with said driving source, for converting the rotational motion of said driving source into a reciprocating motion;
• an impact mechanism portion, being connected with said motion converting mechanism portion, for transmitting said reciprocating motion to a tool end;
• a rotational motion transmitting mechanism portion, being disposed separately from said motion converting mechanism portion, for transmitting the rotational motion of said driving source to the tool end;
• and
• first and second slipping clutches being disposed at different portions on said rotational motion transmitting mechanism portion;
• said first slipping clutch having a slipping torque larger than a slipping torque of said second slipping clutch;
• said second slipping clutch including a lock-and-unlock member for selectively locking and unlocking said second slipping clutch, so that the second slipping clutch works prior to said first slipping clutch when said lock-and-unlock member is positioned to unlock the second slipping clutch, and conversely, does not work prior to said first slipping clutch when said lock-and-unlock member is positioned to lock the second slipping clutch.