| 摘要 |
A bolt for connecting two parts with one another has a bolt member having an axis, a threaded portion provided with a thread, and another portion having a polygonal circumference, a friction washer non-rotatably connected to the polygonal circumference of the other portion of the bolt member and having a first facial area adapted to abut against a facial area of one of the two parts and also having an opposite second facial area, a sleeve connected to the thread of the threaded portion of the bolt member and having a facial area abutting against the second facial area of the friction member, means provided on the sleeve for applying a given force, and means provided on one of the bolt member and the friction washer so as to apply a given force in an opposite direction to the sleeve, so that when a given force is applied in one direction to at least one of the bolt member and the friction washer through the means on the at least one bolt member and the washer and a given force is applied in an opposite direction to the sleeve through the means of the sleeve, only the sleeve turns while the bolt member does not turn and only is elongated or relaxed.
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