| 摘要 |
A gyration/reciprocating action switching mechanism. The mechanism includes an output shaft, a first clutch mounted on said output shaft, and a second clutch mounted inside the first clutch and coupled to the output shaft. A torsional force adjustment mechanism is mounted on a speed reduction mechanism of a power hand tool. The mechanism further includes a gyration adjustment device. The rotation of the gyration adjustment device to a lower limit position forces the first axle sleeve of the first clutch into engagement with the second axle sleeve of the first clutch to shorten the stroke of the output shaft, causing the first cam to be disengaged from the second cam by the spring force of a coil spring of the second clutch, enabling the coil spring of the second clutch to be compressed to force the first cam into contact with the second cam and to let the output shaft be reciprocated upon pressing of the output shaft against an object.
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