| 摘要 |
A nailing gun is formed with a cylinder. The cylinder has an inner wall. The inner wall has a plurality of exhausting holes. The cylinder has a piston. The piston is connected to a piston rod. The periphery of the piston has at least one annular groove. The annular groove has an O ring and a C ring therein. The C ring and O ring are arranged radially. The C ring is positioned at the outer side of the O ring and encloses the O ring. When the piston is installed in the cylinder, the C ring is resisted by the elastic force of the O ring. Because of the confinement of the inner wall of the cylinder, the tilt opening will close so that the C ring resists against the inner wall of the piston to be tightly adhered to the inner wall.
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