| 摘要 |
A rotary pneumatic torque tool such as a non-impacting nut runner, a screw driver or like tool, having means for automatic torque shift between a motor unit and an output shaft, said shift being obtained in response to the torque required for rotating a threaded member to be fastened, whereby the threaded member is first rotated at high speed and low torque and, when a predetermined reaction torque at the threaded member is exceeded, at low speed and high torque to reduce the total time for securing the threaded member.
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