Fastening tool

A fastening tool comprising:

• a housing comprising a substantially cylindrical body part and a handle part extending from the body part in a substantially perpendicular direction;
• an air plug arranged on an end part of the handle part which is separated from the body part, wherein the air plug is configured to be supplied a compressed air;
• an accumulator chamber that is configured to be a part of the housing and accumulates the compressed air;
• a piston that reciprocates in a cylinder due to the compressed air;
• a driver blade that is connected to the piston and drives a fastener;
• a nose member having an injection port for injecting the fastener;
• a push lever that moves to a first position along the nose member when causing a leading end of the injection port to move in a pressing direction toward a driven material, and is located at a second position when the leading end of the injection port is not pressed to the driven material;
• and
• a trigger that actuates a switch mechanism which controls air discharge of the accumulator chamber, wherein in a state that the push lever moves to the first position and the trigger is pulled, by communicating the accumulator chamber with an upper chamber of the piston, the compressed air in the accumulator chamber flows into the cylinder and a strike is performed accordingly;
• wherein in the fastening tool, the air plug that supplies the compressed air to the accumulator chamber is arranged in the housing, a discharge port for discharging the compressed air in the accumulator chamber is arranged, a relief valve that operates by an air pressure of the compressed air and opens and closes the discharge port is arranged near the air plug, and an air passage is arranged that supplies a portion of the compressed air to the relief valve side when the trigger is pulled;
• and
• a prescribed amount of air flows to the relief valve through the air passage and a pressure of a valve chamber increases gradually, and the compressed air in the accumulator chamber is discharged to the outside of the housing if the air pressure acting on the relief valve increases.

A fastening tool comprising:

• a housing comprising a substantially cylindrical body part and a handle part extending from the body part in a substantially perpendicular direction;
• an air plug arranged on an end part of the handle part which is separated from the body part, wherein the air plug is configured to be supplied a compressed air;
• an accumulator chamber that is configured to be a part of the housing and accumulates the compressed air, wherein the air plug supplies the compressed air to the accumulator chamber from a connection hose in outside;
• a piston that reciprocates in a cylinder due to the compressed air;
• a driver blade that is connected to the piston and drives a fastener;
• a nose member having an injection port for injecting the fastener;
• a push lever that moves to a first position along the nose member when causing a leading end of the injection port to move in a pressing direction toward a driven material, and is located at a second position when the leading end of the injection port is not pressed to the driven material;
• a trigger that actuates a switch mechanism which controls air discharge of the accumulator chamber, wherein in a state that the push lever moves to the first position and the trigger is pulled, by communicating the accumulator chamber with an upper chamber of the piston, the compressed air in the accumulator chamber flows into the cylinder, and a strike is performed accordingly;
• wherein in the fastening tool, an air driven timer valve is arranged to block an air passage from the air plug to the accumulator chamber, and opens and closes a discharge port for discharging the compressed air from the accumulator chamber to an atmosphere, and
• if a state of the trigger being pulled continues for a prescribed time or longer when the push lever is in the second position, the compressed air in the accumulator chamber is released to the outside by the air driven timer valve, and the air passage from the air plug to the accumulator chamber is blocked.