Patent ID: 6883617
Filing Date: 2005-04-26
Classification: B25B

Abstract:
1. An automatic shutoff mechanism for a pneumatic torque-applying tool having an air motor, a pressurized airflow path to the motor and a torquing mechanism driven by the motor, the shutoff mechanism comprising: a valve member movable between a normal open position permitting pressurized airflow to the motor and a closed position blocking pressurized airflow to the motor, bias structure resiliently urging the valve member to its normal open position, the valve member having opposite first and second sides such that in the open position only the first side is exposed to pressurized airflow, and a trip apparatus responsive to application of a predetermined torque by the torquing mechanism for moving the valve member to a trip position in the airflow path spaced from the open position sufficiently that the second side of the valve member is exposed to pressurized airflow for driving the valve member from the trip position to the closed position.