| 摘要 |
Provided according to the invention is a fastening tool ( 10 ) for tightening/untightening screw threaded fasteners such as bolts or nuts ( 18 ). The bolts ( 18 ) comprise a head formed with a series of at least three cavities ( 18 a) deployed therearound. The fastening tool ( 10 ) comprises at least three peanut-shaped displaceable locking bodies ( 16 ) having spherical portions ( 16 a ; 16 b), and a restricted neck portion ( 16 c) therebetween. The cavities ( 18 a) of the bolt ( 18 ) are configured to receive the spherical portions ( 16 b). A seat member ( 12 ) is provided, formed with a series of at least three cavities ( 22 ) configured to receive the spherical portions ( 16 a). Further provided is a manipulator ( 14 ) for rocking the locking bodies ( 16 ) about their neck portions ( 16 c) from a non-operative position wherein the spherical portions ( 16 a) are seated in the cavities ( 22 ), into an operative position wherein the spherical portions ( 16 b) are seated in the bolt cavities ( 18 a), and vice versa.
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