Patent ID: 6883619
Filing Date: 2005-04-26
Classification: B25B

Abstract:
1. A bidirectional pneumatic impact wrench comprising: a housing comprising a front assembly attached to the front of the motor casing; a hammer assembly mounted in the motor chamber and connected to the front assembly; a pneumatic motor mounted in the motor chamber, connected to the hammer assembly to drive the hammer assembly and having a rear, a reverse air inlet and forward air inlet defined in the rear and an air outlet communicating with the motor chamber; a rear assembly attached to the rear of the motor casing and comprising an air control valve mounted at the outer side of the rear cover and comprising a knob attached to the outside end of the shaft to turn the shaft; a positioning device mounted in the knob to hold the knob in place; and an O-ring mounted in the annular slot to keep the compressed air from directly being exhausted through the exhaust air passage.