Patent ID: 7080578
Filing Date: 2006-07-25
Classification: B25B

Abstract:
1. A power driven tool for tightening and loosening a mechanical fastener, the tool comprising: a housing; a motor in the housing having a motor shaft adapted to be rotated by the motor at a first higher speed; a reduction gear in the housing operatively connected to the motor shaft, the reduction gear having a reduction gear shaft adapted to be rotated by the reduction gear at a second lower speed that is slower than the first higher speed of rotation of the motor shaft; an impact drive in the housing operatively connected to the reduction gear shaft, the impact drive having an output shaft disposed for rotation, the impact drive being adapted for intermittently providing an increased torque on the output shaft, a ratchet head assembly operatively connected to the output shaft of the impact drive, the ratchet head assembly including an output member rotatably mounted on the housing and capable of engaging the mechanical fastener, and a ratchet mechanism operable to limit rotation of the output member in one direction.