Pneumatic tool

A pneumatic tool, comprising:

• a main body being hollowed and having a receiving space, wherein one of two ends of the main body is assembled with a pneumatic motor, the pneumatic motor has a transmission shaft inserted into the receiving space, the transmission shaft comprises a transmission tooth portion, a connecting member is assembled in the other end of the main body and being slidable along an axial direction of the main body, one of two ends of the connecting member toward the receiving space forms a connecting portion, and the other end of the connecting member distant from the receiving space forms a knife assembling portion;
• a driving gear rotatably assembled in the receiving space, wherein the driving gear has a gear groove portion, the gear groove portion is engaged with the transmission tooth portion, a protruding post is assembled on a portion of the driving gear from an axis of the driving gear;
• a linking bar having a first end and a second opposite to the first end, wherein the first end of the linking bar is pin-jointed to the protruding post, so that the first end of the linking bar is pivotable relative to the protruding post, the first end of the linking bar is not shiftable relative to the protruding post, the second end of the linking bar is pin-jointed to the connecting portion of the connecting member, so that the second end of the linking bar is pivotable relative to the connecting portion of the connecting member, the second end of the linking bar is not shiftable relative to the connecting portion of the connecting member;
• and
• wherein the first end of the linking bar has a first through hole, and a first slidable member is received in the first through hole, the first slidable member is hollowed and ring shaped, and the first slidable member has a first outer wall and a first inner wall, a shape of an outer periphery of the first outer wall corresponds to a shape of an inner periphery of the first through hole, the first outer wall of the first slidable member is abutted against the inner periphery of the first through hole, the protruding post has a post body, and a shape of the first inner wall corresponds to a shape of the post body of the protruding post, the post body of the protruding post is inserted into the first slidable member and abutted against the first inner wall of the first slidable member, and wherein the second end of the linking bar has a second through hole, and a second slidable member is received in the second through hole, the second slidable member is hollowed and ring shaped, and the second slidable member has a second outer wall and a second inner wall, a shape of an outer periphery of the second outer wall corresponds to a shape of an inner periphery of the second through hole, the second outer wall of the second slidable member is abutted against the inner periphery of the second through hole, a positioning post has a post body, and a shape of the second inner wall corresponds to a shape of the post body of the positioning post, the post body of the positioning post is inserted into the connecting portion and the second through hole of the linking bar, and the post body of the positioning post is abutted against the second inner wall of the second slidable member.