| 摘要 |
A pneumatic driver for driving a fastener including an air inlet connectable to an air supply and a pneumatically driven motor driveable by air supply about a tool axis. The driver further including a bit holder, a torque control, and a push rod in mechanical communication with the torque control such that the pin is axially positionable between an off position, a drive position and a torque blocked position. The rod moving to the drive position in response to axial pressure being applied to the bit holder and driver further including an inlet air chamber and a signal pressure chamber fluidly connecting the air inlet and the motor. The driver further including a port between the inlet and signal chambers and a second port between the pressure chamber and the motor and the rod extending through the pressure chamber into the inlet chamber and including a first seal for selectively sealing the first port and a second seal for selectively sealing the second port. The first seal being in a closed condition when the rod is in the off position, the first and second seals being in an opened condition when the rod is in the drive position thereby allowing the associated air flow to reach the motor, and the second seal being in a closed condition and the first seal being in the open condition when the rod is in the torque blocked position thereby maintaining air flow into the pressure chamber.
|
