Bolt-nut tightening device having means for preventing abnormal rotation
 A bolt-nut tightening device comprising an epicyclic train including a tubular internal gear case and a planet gear support frame, an outer socket coupled to the gear case, an inner socket connected to the support frame and a one-way rotation permitting member provided between the gear case and the main body of the device for preventing the two sockets from rotating at a high speed in the same direction. 
Nissan Motor Co., Ltd. Maeda Metal Industries Ltd.
B B B
B25B B25B B25B
inventional inventional inventional
Masahiro Yukio
Fujita Uemura