| 摘要 |
A power tool for tightening and loosening a bolt connected with a nut and a washer arranged so that the nut banks with one of its sides onto one of washer faces, the power tool comprising a housing, drive means accommodated in the housing, and at least two coaxial connecting means including a first connecting means provided for engaging and turning the nut and subjected to a turning force in one direction, and a second connecting means subjected to a turning force in an opposite direction, the coaxial connecting means being formed so that one of the coaxial connecting means is being turned while the other of the two coaxial connecting means stand still depending on a turning friction encountered as a result of one being connected with the washer while the other one is connected with the nut, or the result of one being connected with the bolt and the other one is connected with the nut, or as a result of one being connected with a reaction arm adapted to abut against an adjacent stationary object while the other one is connected with the nut.
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