| 摘要 |
The disclosure provides a tool for crimping tubular internally screw-threaded fasteners by axially collapsing the fasteners to create a bulge, in which a screw carried by the tool is engaged with the fastener and is then held stationary and axially displaced, the screw being unscrewed from the fastener at the conclusion of the displacement, and these operations being effected by including a lost-motion device in the drive to the screw. The lost-motion device disclosed includes a pair of discs trapping a drive ball between them so that rotation of one disc rolls the ball around a cam track between the discs and separates the discs to provide the axial displacement, drive being resumed when the ball reaches the ends of the tracks.
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