| 摘要 |
<p>A locking fastener (10) comprises a nut (12) having a threaded portion (14) formed about a central axis (16) of the fastener. A head portion (18) of the nut is formed integral to the threaded portion (14), for gripping the fastener during tightening or loosening. An inner member (22) is provided coaxial with the head portion (18) and is designed to be mechanically coupled to an underside of the head portion (18) so as to be substantially immobile relative to the head portion. Inner member (22) is provided with inclined cam means (24) in the form of a plurality of cam surfaces arranged in an annular configuration about the inner member (22). A locking member (26) is provided coaxial with the threaded portion (14) and has a matching cam means (28) on one face adapted to rotatably interengage in facing relation with the inclined cam means (24) on inner member (22). A first pressure transmitting surface (30) on the opposite face of the locking member (26) is rotatably received in facing relation to a second pressure transmitting surface (34) provided on an outer member (32). Outer member (32) is coaxial with the locking member (26). A solid friction reducing material in the form of an annulus (36) is located between the first pressure transmitting surface (30) of the locking member (26) and the second pressure transmitting surface (34) of the outer member (32). Locking means for releasably locking the locking member (26) in position relative to the outer member (32) are also provided. In use, the outer member (32) can be held stationary relative to a fastened object so that the friction reducing annulus (36) can act as a bearing for the head portion (18) during tightening or loosening of the fastener and when the fastener has been tightened and the locking member has been locked in position relative to the outer member (32), inadvertent loosening of the head portion (18) due to vibration can be inhibited by the interengaging cam means (24, 28).</p> |
