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A nail-driving tool includes a cylinder defining a chamber for reciprocatingly receiving a piston. A bumper is received in the chamber and includes a first bumper section and a second bumper section made of a material having a rigidity different from that of the first bumper section. When in a drivi

A nail-driving tool includes a cylinder defining a chamber for reciprocatingly receiving a piston. A bumper is received in the chamber and includes a first bumper section and a second bumper section made of a material having a rigidity different from that of the first bumper section. When in a driving stroke of the piston toward the bumper, air in the chamber exits the cylinder via ports of the cylinder.

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1. A nail-driving tool comprising:a cylinder comprising a chamber defined by an inner peripheral wall and an end wall, the end wall including a through-hole, the inner peripheral wall including plural ports communicated with outside;a piston reciprocatingly received in the chamber of the cylinder;a

1. A nail-driving tool comprising:a cylinder comprising a chamber defined by an inner peripheral wall and an end wall, the end wall including a through-hole, the inner peripheral wall including plural ports communicated with outside;a piston reciprocatingly received in the chamber of the cylinder;a driving element securely attached to the piston to move therewith, the driving element extending through the through-hole of the end wall;a bumper received in the chamber and located between the piston and the end wall, the driving element extending through the bumper, with the bumper including a first bumper section having an outer periphery; andan annular gap extending completely around the inner peripheral wall of the cylinder and between the inner peripheral wall of the cylinder and the outer periphery of the first bumper section of the bumper, with the annular gap having an axial extent along the driving element, with the outer periphery of the first bumper section not being in contact with the inner peripheral wall of the cylinder and located around the driving element, with the plural ports located within the axial extent of the annular gap, with the annular gap being in communication with the plural ports,the annular gap allowing exit of the air in the chamber via the plural ports of the cylinder and allowing entrance of ambient air into the chamber of the cylinder via the plural ports of the cylinder located within the axial extent of the annular gap, with the bumper further comprising a second bumper section made of a material having a rigidity different from that of the first bumper section, with the driving element extending through the first bumper section and the second bumper section, with the second bumper section including an enlarged end section that abuts against the end wall, with the enlarged end section of the second bumper section having a cross sectional size perpendicular to the driving element having a radial extent larger than that of the annular gap. 2. The nail-driving tool as claimed in claim 1, further comprising means for driving the piston, said piston-driving means being one of pressurized air and inflammable gas. 3. The nail-driving tool as claimed in claim 1, further comprising:a head, with the cylinder mounted in the head, wherein the head comprises plural ports in an end thereof to allow communication between the chamber of the cylinder and outside. 4. The nail-driving tool as claimed in claim 1, further comprising:a head, with the cylinder mounted in the head. 5. The nail-driving tool as claimed in claim 1, with the second bumper section including a first portion of a cross sectional size perpendicular to the driving element, with the second bumper section including the enlarged end section extending from the first portion and of a cross sectional size perpendicular to the driving element larger than the cross sectional size of the first portion, with a cross sectional shape of the second bumper section parallel to the driving element being in the form of a T. 6. The nail-driving tool as claimed in claim 1, with the enlarged end section being of a larger cross sectional size than the outer periphery of the first bumper section of the bumper not in contact with the inner peripheral wall of the cylinder, with the nail-driving tool further comprising an annular connecting wall being defined between the end wall and the inner peripheral wall, the enlarged end section of the bumper being securely received in a space defined by the annular connecting wall. 7. The nail-driving tool as claimed in claim 6, wherein the annular connecting wall has a cross-sectional size larger than that of the inner peripheral wall of the cylinder, thereby defining the annular gap between the inner peripheral wall of the cylinder and the outer periphery of the first bumper section of the bumper not in contact with the inner peripheral wall of the cylinder. 8. The nail-driving tool as claimed in claim 7, further comprisin g means for driving the piston, said piston-driving means being one of pressurized air and inflammable gas. 9. The nail-driving tool as claimed in claim 7, further comprising:a head, with the cylinder mounted in the head, wherein the head comprises plural ports in an end thereof to allow communication between the chamber of the cylinder and outside. 10. The nail-driving tool as claimed in claim 7, wherein the first bumper section is more rigid than the second bumper section. 11. The nail-driving tool as claimed in claim 7, wherein the annular gap is defined between the second bumper section and the inner peripheral wall of the cylinder. 12. The nail-driving tool as claimed in claim 11, further comprising means for driving the piston, said piston-driving means being one of pressurized air and inflammable gas. 13. The nail-driving tool as claimed in claim 11, further comprising:a head, with the cylinder mounted in the head, wherein the head comprises plural ports in an end thereof to allow communication between the chamber of the cylinder and outside.