Pneumatic tool structure capable of isolating shock and releasing pressure

A pneumatic tool structure comprising:

• an air intake head including a press lever, an air channel, and a connection portion formed on an end of the air intake head, the connection portion having a first coupling orifice defined on an edge of the connection portion and communicating with the air channel and configured to accommodate an end of an air guide tube;
• a slidable sleeve, a first end of the slidable sleeve being screwed with the connection portion of the air intake head, and the slidable sleeve including a shoulder extending from an inner wall of a second end of the slidable sleeve;
• a drive unit including a body having a first segment and a second segment, a part of the second segment of the body being slidably fitted in the slidable sleeve, and the body including a recessed portion formed around an outer wall of the body, the recessed portion having a defining fringe formed on an end of the recessed portion adjacent to the air intake head and stopped by the shoulder of the slidable sleeve, such that the body is limited to slide forward in an extreme position, wherein an air discharge conduit is defined between the slidable sleeve and the body, the defining fringe has at least one pressure relief groove, the body has a screw bolt disposed in the second segment of the body, and the screw bolt has an air flow orifice formed on a center thereof and configured to accommodate the air guide tube, the first segment of the body has a second coupling orifice, the body has a chamber communicating with the second coupling orifice, and an air valve is mounted between the chamber and the screw bolt;
• a piston slidably accommodated in the chamber;
• an operation element fixed on a front side of the body;
• a resilient element being elastic, received in the slidable sleeve, and defined between the air intake head and the screw bolt, wherein the resilient element includes a through hole for receiving the air guide tube;
• a first isolation ring fitted on an outer wall of the screw bolt and located between the screw bolt and the slidable sleeve, the first isolation ring includes a first rim, a second rim opposite to the first rim, multiple first discharging grooves equidistantly formed on an outer wall of the first isolation ring, and multiple first contact portions, wherein a respective first contact portion is formed between any two adjacent first discharging grooves, and the multiple first discharging grooves are in communication with the first rim and the second rim;
• and
• a second isolation ring fitted on the outer wall of the body and located between the body and the slidable sleeve, the second isolation ring including a third rim, a fourth rim opposite to the third rim, multiple second discharging grooves equidistantly formed on an outer wall of the second isolation ring, and multiple second contact portions, wherein a respective second contact portion is formed between any two adjacent second discharging grooves, and the multiple second discharging grooves are in communication with the third rim and the fourth rim.