Patent ID: 8347979
Filing Date: 2013-01-08
Classification: F01D

Abstract:
1. A pneumatic impact wrench comprising: a handle assembly graspable by a user; a work attachment coupled to the handle assembly; an inlet permitting air flow into the pneumatic impact wrench to drive the impact wrench; an outlet permitting air flow out of the pneumatic impact wrench; a motor assembly positioned between the inlet and the outlet, the motor assembly including a rotor driven by the air flow between the inlet and the outlet, the motor assembly defining a longitudinal motor axis about which the rotor rotates; an output drive coupled to the motor assembly and selectively rotated in response to rotation of the rotor, the output drive defining a longitudinal output axis about which the output drive rotates, wherein the longitudinal output axis is substantially perpendicular to the longitudinal motor axis; an impact mechanism positioned between the motor assembly and the output drive, the impact mechanism selectively driving the output drive in response to rotation of the rotor; a valve coupled to the handle assembly, the valve moveable between a first position, in which the pneumatic impact wrench operates in a forward direction, and a second position, in which the pneumatic impact wrench operates in a reverse direction; and a motor housing mounted around the rotor and valve, the motor housing including an inner surface facing toward the rotor and valve, and an outer surface facing away from the rotor and valve; an inlet passage defined between the inlet and the rotor, the inlet passage defining an inlet longitudinal axis; and an exhaust passage defined between the inner surface of the motor housing and the rotor; wherein a majority of the exhaust passage extends substantially parallel to the inlet longitudinal axis.