Armstrong, Nikaido, Marmelstein & Kubovcik
Rotary power tool
 A rotary power tool wherein an epicyclic train has a planet gear support frame coupled to an output shaft by a one-way clutch and a sun gear coupled to the output shaft by a clutch assembly which comprises a clutch plate, a slide tube, an arresting mechanism and a change lever, the output shaft being operable for tightening first with low-torque high-speed rotation and finally with high-torque low-speed rotation and being prevented from abruptly rotating at a high speed even if the load on the output shaft decreases. 
Nissan Motor Co., Ltd. Maeda Metal Industries, Ltd.
B B B
B25B B25B B25B
inventional inventional inventional
Yukio Masahiro
Uemura Fujita