A fastener driving tool includes a frame defining therein an accumulator that accumulates compressed air, a cylinder, a piston movable between a top dead center and a bottom dead center, a main valve section having a main valve movable between a top dead center and a bottom dead center to alternatel
A fastener driving tool includes a frame defining therein an accumulator that accumulates compressed air, a cylinder, a piston movable between a top dead center and a bottom dead center, a main valve section having a main valve movable between a top dead center and a bottom dead center to alternately open and block fluid communication between a piston upper chamber and the accumulator, a trigger valve section having a plunger movable between a top dead center and a bottom dead center so as to alternately open and block fluid communication from the accumulator to a main valve chamber, and fluid communication from the main valve chamber to atmosphere, and a trigger adapted to press the plunger when operated by a user. The piston moves from the top dead center to the bottom dead center within 11.3 msec when the plunger is pressed.
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What is claimed is: 1. A fastener driving tool comprising: a frame defining therein an accumulator that accumulates compressed air; a cylinder disposed within the frame; a piston disposed within the cylinder and movable between a top dead center and a bottom dead center, a piston upper chamber bein
What is claimed is: 1. A fastener driving tool comprising: a frame defining therein an accumulator that accumulates compressed air; a cylinder disposed within the frame; a piston disposed within the cylinder and movable between a top dead center and a bottom dead center, a piston upper chamber being defined by an inner peripheral surface of the cylinder and an upper surface of the piston; a main valve section disposed in the frame and having a main valve movable between a top dead center and a bottom dead center to alternately open and block fluid communication between the piston upper chamber and the accumulator, a main valve chamber being defined by an upper surface of the main valve and a part of the frame; a trigger valve section having a plunger movable between a top dead center and a bottom dead center so as to alternately open and block fluid communication from the accumulator to the main valve chamber, and fluid communication from the main valve chamber to atmosphere; a first channel providing a fluid communication between the main valve chamber and the trigger valve section; and a trigger adapted to press the plunger when operated by a user; wherein a ratio obtained from dividing a maximum internal volume of the main valve chamber measured in m3 by a cross sectional area of the first channel measured in m2 is no greater than 0.8. 2. The fastener driving tool as defined in claim 1, wherein the piston moves from the top dead center to the bottom dead center within 11.3 msec when the plunger is pressed. 3. The fastener driving tool as defined in claim 1, wherein the main valve moves from the bottom center to the top dead center within 7 msec when the plunger is pressed. 4. A fastener driving tool comprising: a frame defining therein an accumulator that accumulates a compressed air; a cylinder disposed within the frame; a piston disposed in the cylinder and movable between a top dead center and a bottom dead center, a piston upper chamber being defined by an inner peripheral surface of the cylinder and an upper surface of the piston; a main valve section disposed in the frame and having a main valve movable between a top dead center and a bottom dead center to alternately open and block fluid communication between the piston upper chamber and the accumulator, a main valve chamber being defined by an upper surface of the main valve and a part of the frame; a trigger valve section including a trigger valve frame, a valve piston disposed in the trigger valve frame and a plunger disposed extending through the valve piston and movable between a top dead center and a bottom dead center, the valve piston being movable between a top dead center and a bottom center in a direction opposite to movement of the plunger so as to alternatively open and block fluid communication from the accumulator to the main valve chamber, and a fluid communication from the main valve chamber to atmosphere; a trigger valve chamber defined by the trigger valve frame, an end surface of the valve piston and the plunger; a channel providing fluid communication between the trigger valve chamber and atmosphere; and a trigger adapted to press the plunger when operated by a user; wherein a ratio obtained from dividing the maximum volume of the trigger valve chamber measured in m3 by a cross sectional area of the channel measured in m2 is no greater than 0.20. 5. The fastener driving tool as defined in claim 4, wherein the piston moves from the top dead center to the bottom dead center within 11.3 msec when the plunger is pressed. 6. The fastener driving tool as defined in claim 4, wherein the valve piston moves from the top dead center to the bottom dead center within 0.75 msec when the plunger is pressed. 7. A fastener driving tool comprising: a frame defining therein an accumulator that accumulates compressed air; a cylinder disposed within the frame; a piston disposed within the cylinder and movable between a top dead center and a bottom dead center, a piston upper chamber being defined by an inner peripheral surface of the cylinder and an upper surface of the piston; a trigger valve section including a trigger valve frame, a valve piston disposed in the trigger valve frame and movable between a top dead center and a bottom dead center and a plunger disposed extending through the trigger valve frame and movable between a top dead center and a bottom dead center in a direction opposite to movement of the valve piston, so as to alternatively open and block fluid communication from the accumulator to the piston upper chamber, and fluid communication from the piston upper chamber to atmosphere; a trigger valve chamber defined by the trigger valve frame, and an end surface of the valve piston and the plunger; a channel providing fluid communication between the trigger valve chamber and atmosphere; and a trigger adapted to press the plunger when operated by a user; wherein a ratio obtained from dividing the maximum volume of the trigger valve chamber measured in m3 by a cross sectional area of the channel measured in m2 is no greater than 0.20. 8. The fastener driving tool as defined in claim 7, wherein the piston moves from the top dead center to the bottom dead center within 11.3 msec when the plunger is pressed. 9. A fastener driving tool comprising: a frame defining therein an accumulator that accumulates compressed air; a cylinder disposed within the frame; a piston disposed within the cylinder and movable between a top dead center and a bottom dead center, a piston upper chamber being defined by an inner peripheral surface of the cylinder and an upper surface of the piston; a trigger valve section including a trigger valve frame and movable between a top dead center and a bottom dead center and a plunger disposed extending through the trigger valve frame and movable between a top dead center and a bottom dead center in a direction opposite to movement of the valve piston so as to alternatively open and block fluid communication from the accumulator to the piston upper chamber, and a first channel providing fluid communication from the piston upper chamber to atmosphere; a trigger valve chamber defined by the trigger valve frame, and an end surface of the valve piston and the plunger; a second channel providing fluid communication between the trigger valve chamber and atmosphere; and a trigger adapted to press the plunger when operated by a user; wherein a ratio obtained from dividing the maximum volume of the trigger valve chamber measured in m3 by a cross sectional area of the second channel measured by m2 is no greater than 0.20. 10. A fastener driving tool comprising: a frame defining therein an accumulator that accumulates a compressed air; a cylinder disposed within the frame; a piston disposed in the cylinder and movable between a top dead center and a bottom dead center, a piston upper chamber being defined by an inner peripheral surface of the cylinder and an upper surface of the piston; a main valve section disposed in the frame and having a main valve movable between a top dead center and a bottom dead center to alternately open and block fluid communication between the piston upper chamber and the accumulator, a main valve chamber being defined by an upper surface of the main valve and a part of the frame; a trigger valve section including a trigger valve frame, a valve piston disposed in the trigger valve frame and a plunger disposed extending through the valve piston and movable between a top dead canter and a bottom dead center, the valve piston being movable between a top dead center and a bottom center in a direction opposite to movement of the plunger so as to alternatively open and block fluid communication from the accumulator to the main valve chamber, and a fluid communication from the main valve chamber to atmosphere; a first channel providing a fluid communication between the main valve chamber and the trigger valve section; and a trigger adapted to press the plunger when operated by a user; wherein a ratio obtained from dividing a maximum internal volume of the main valve chamber measured in m3 by a cross sectional area of the first channel measured in m2 is no greater than 0.8.
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이 특허에 인용된 특허 (3)
Sauer Marcus,DEX, Driving tool for fastener elements.
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