Cushion device for cylinder of pneumatic tool

A cushion device for a cylinder of a pneumatic tool, and the pneumatic tool comprising:

• a body including a grip and a fitting sleeve fitted with the grip, the fitting sleeve having a chamber defined therein, a closing face formed on a first end thereof, and an opening formed on a second end thereof;
• a cylinder slidably fitted in the chamber of the fitting sleeve, and a part of the cylinder extending out of the fitting sleeve from the opening of the chamber, the cylinder including a room formed therein and an abutting portion adjacent to the closing face of the chamber of the fitting sleeve;
• a valve unit mounted between the room and the abutting portion of the cylinder;
• a piston member accommodated in the room of the cylinder and sliding forward and backward along a movement axis;
• a cushion washer made of a flexible rubber and mounted in the chamber of the fitting sleeve, and the cushion washer abutting against the closing face of the chamber of the fitting sleeve and the pressing face of the abutting portion of the cylinder, wherein the cushion washer includes at least one open segment arranged on at least one end thereof, the at least one open segment has the at least one air groove, and each of the at least one air groove having a mouth parallel to the movement axis of the piston member, the at least one open segment contacts with the closing face and/or the pressing, such that the at least one air groove forms a flexible press space, thus producing double flexibility by using the cushion washer which is made of the flexible rubber and the at least one air groove which forms the flexible press space.