| 摘要 |
A pneumatic screwdriver having an adjustable clockwise torque and a maximum counterclockwise torque includes a transmission seat having at least one steel ball hole and a through hole. The steel ball hole installs a steel ball and has a clockwise rotating area and a counterclockwise rotating area. With a first leaning portion perpendicular to the clockwise rotating area, the steel ball is separated from the steel ball groove easily, so that the transmission seat, steel ball, and steel ball groove slide with each other, and the compressing strength of the torque spring is adjusted to change the clockwise torque. With a second leaning portion disposed with an inclination on the counterclockwise rotating area, the steel ball is stopped from being separated from the steel ball groove, thus the steel ball cannot slide with the transmission seat, and a maximum torque can be outputted directly when the screwdriver is turned counterclockwise.
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